SolarLader/LNSC-2420
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LNSC-2420/switching.sch
Thomas Kolb 2ae98ab46d Initial commit 
- schematic complete
- first placement iteration done
- routing started
2021-04-29 23:15:44 +02:00

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EESchema Schematic File Version 4
EELAYER 30 0
EELAYER END
$Descr A4 11693 8268
encoding utf-8
Sheet 2 3
Title "LNSC-2420"
Date "2021-04-23"
Rev "1"
Comp ""
Comment1 "Design by: Thomas Kolb"
Comment2 ""
Comment3 ""
Comment4 ""
$EndDescr
$Comp
L Device:R R12
U 1 1 607F70B2
P 4100 2500
F 0 "R12" V 3893 2500 50 0000 C CNN
F 1 "2mOhm" V 3984 2500 50 0000 C CNN
F 2 "Resistor_SMD:R_5931_15078Metric" V 4030 2500 50 0001 C CNN
F 3 "~" H 4100 2500 50 0001 C CNN
1 4100 2500
0 1 1 0
$EndComp
$Comp
L Amplifier_Current:INA139 U3
U 1 1 607F8185
P 4750 4000
F 0 "U3" H 5094 4046 50 0000 L CNN
F 1 "INA139" H 5094 3955 50 0000 L CNN
F 2 "Package_TO_SOT_SMD:SOT-23-5" H 4750 4000 50 0001 C CNN
F 3 "http://www.ti.com/lit/ds/symlink/ina169.pdf" H 4750 4005 50 0001 C CNN
1 4750 4000
1 0 0 -1
$EndComp
Wire Wire Line
4450 3900 4350 3900
Wire Wire Line
4350 3900 4350 2500
Wire Wire Line
4350 2500 4250 2500
Wire Wire Line
4450 4100 3850 4100
Wire Wire Line
3850 4100 3850 2500
Wire Wire Line
3850 2500 3950 2500
Connection ~ 3850 2500
$Comp
L power:+5V #PWR012
U 1 1 607FA497
P 4650 3600
F 0 "#PWR012" H 4650 3450 50 0001 C CNN
F 1 "+5V" H 4665 3773 50 0000 C CNN
F 2 "" H 4650 3600 50 0001 C CNN
F 3 "" H 4650 3600 50 0001 C CNN
1 4650 3600
1 0 0 -1
$EndComp
Wire Wire Line
4650 3600 4650 3700
$Comp
L power:GND #PWR013
U 1 1 607FAC7A
P 4650 4400
F 0 "#PWR013" H 4650 4150 50 0001 C CNN
F 1 "GND" H 4655 4227 50 0000 C CNN
F 2 "" H 4650 4400 50 0001 C CNN
F 3 "" H 4650 4400 50 0001 C CNN
1 4650 4400
1 0 0 -1
$EndComp
Wire Wire Line
4650 4400 4650 4300
$Comp
L Device:R R13
U 1 1 607FB268
P 5500 4250
F 0 "R13" H 5570 4296 50 0000 L CNN
F 1 "56k" H 5570 4205 50 0000 L CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 5430 4250 50 0001 C CNN
F 3 "~" H 5500 4250 50 0001 C CNN
1 5500 4250
1 0 0 -1
$EndComp
$Comp
L power:GND #PWR014
U 1 1 607FB5DA
P 5500 4550
F 0 "#PWR014" H 5500 4300 50 0001 C CNN
F 1 "GND" H 5505 4377 50 0000 C CNN
F 2 "" H 5500 4550 50 0001 C CNN
F 3 "" H 5500 4550 50 0001 C CNN
1 5500 4550
1 0 0 -1
$EndComp
Wire Wire Line
5500 4550 5500 4500
Wire Wire Line
5500 4100 5500 4000
Text Notes 4450 3150 0 50 ~ 0
20 A * 2 mΩ = 40 mV\nVoltage Gain G = 56\n=> 56 * 0.04 V = 2.24 V @ 20 A\n\nI = U_adc / G / R_s\n\nf_g = 1/(2*pi * R *C) = 605 Hz
Wire Wire Line
5050 4000 5500 4000
Connection ~ 5500 4000
Wire Wire Line
5500 4000 5850 4000
$Comp
L Device:C C8
U 1 1 607FCB15
P 5850 4250
F 0 "C8" H 5965 4296 50 0000 L CNN
F 1 "4.7nF" H 5965 4205 50 0000 L CNN
F 2 "Capacitor_SMD:C_0603_1608Metric" H 5888 4100 50 0001 C CNN
F 3 "~" H 5850 4250 50 0001 C CNN
1 5850 4250
1 0 0 -1
$EndComp
Wire Wire Line
5850 4100 5850 4000
Connection ~ 5850 4000
Wire Wire Line
5500 4500 5850 4500
Wire Wire Line
5850 4500 5850 4400
Connection ~ 5500 4500
Wire Wire Line
5500 4500 5500 4400
$Comp
L Device:Q_NMOS_GDS Q8
U 1 1 60806806
P 9500 2400
F 0 "Q8" V 9749 2400 50 0000 C CNN
F 1 "IRFS7437PBF" V 9840 2400 50 0000 C CNN
F 2 "Package_TO_SOT_SMD:TO-263-3_TabPin2" H 9700 2500 50 0001 C CNN
F 3 "~" H 9500 2400 50 0001 C CNN
1 9500 2400
0 -1 1 0
$EndComp
$Comp
L Device:R R17
U 1 1 608089C6
P 7750 2500
F 0 "R17" V 7543 2500 50 0000 C CNN
F 1 "10mOhm" V 7634 2500 50 0000 C CNN
F 2 "Resistor_SMD:R_1210_3225Metric" V 7680 2500 50 0001 C CNN
F 3 "~" H 7750 2500 50 0001 C CNN
1 7750 2500
0 1 1 0
$EndComp
$Comp
L Amplifier_Current:INA139 U5
U 1 1 60808AAA
P 8400 4000
F 0 "U5" H 8744 4046 50 0000 L CNN
F 1 "INA139" H 8744 3955 50 0000 L CNN
F 2 "Package_TO_SOT_SMD:SOT-23-5" H 8400 4000 50 0001 C CNN
F 3 "http://www.ti.com/lit/ds/symlink/ina169.pdf" H 8400 4005 50 0001 C CNN
1 8400 4000
1 0 0 -1
$EndComp
Wire Wire Line
8100 3900 8000 3900
Wire Wire Line
8000 3900 8000 2500
Wire Wire Line
8000 2500 7900 2500
Wire Wire Line
8100 4100 7500 4100
Wire Wire Line
7500 4100 7500 2500
Wire Wire Line
7500 2500 7600 2500
$Comp
L power:+5V #PWR019
U 1 1 60808ABC
P 8300 3600
F 0 "#PWR019" H 8300 3450 50 0001 C CNN
F 1 "+5V" H 8315 3773 50 0000 C CNN
F 2 "" H 8300 3600 50 0001 C CNN
F 3 "" H 8300 3600 50 0001 C CNN
1 8300 3600
1 0 0 -1
$EndComp
Wire Wire Line
8300 3600 8300 3700
$Comp
L power:GND #PWR020
U 1 1 60808AC7
P 8300 4400
F 0 "#PWR020" H 8300 4150 50 0001 C CNN
F 1 "GND" H 8305 4227 50 0000 C CNN
F 2 "" H 8300 4400 50 0001 C CNN
F 3 "" H 8300 4400 50 0001 C CNN
1 8300 4400
1 0 0 -1
$EndComp
Wire Wire Line
8300 4400 8300 4300
$Comp
L Device:R R19
U 1 1 60808AD2
P 9100 4250
F 0 "R19" H 9170 4296 50 0000 L CNN
F 1 "56k" H 9170 4205 50 0000 L CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 9030 4250 50 0001 C CNN
F 3 "~" H 9100 4250 50 0001 C CNN
1 9100 4250
1 0 0 -1
$EndComp
$Comp
L power:GND #PWR022
U 1 1 60808ADC
P 9100 4550
F 0 "#PWR022" H 9100 4300 50 0001 C CNN
F 1 "GND" H 9105 4377 50 0000 C CNN
F 2 "" H 9100 4550 50 0001 C CNN
F 3 "" H 9100 4550 50 0001 C CNN
1 9100 4550
1 0 0 -1
$EndComp
Wire Wire Line
9100 4550 9100 4500
Wire Wire Line
9100 4100 9100 4000
Wire Wire Line
8700 4000 9100 4000
Connection ~ 9100 4000
Wire Wire Line
9100 4000 9450 4000
$Comp
L Device:C C11
U 1 1 60808AED
P 9450 4250
F 0 "C11" H 9565 4296 50 0000 L CNN
F 1 "4.7nF" H 9565 4205 50 0000 L CNN
F 2 "Capacitor_SMD:C_0603_1608Metric" H 9488 4100 50 0001 C CNN
F 3 "~" H 9450 4250 50 0001 C CNN
1 9450 4250
1 0 0 -1
$EndComp
Wire Wire Line
9450 4100 9450 4000
Connection ~ 9450 4000
Wire Wire Line
9100 4500 9450 4500
Wire Wire Line
9450 4500 9450 4400
Connection ~ 9100 4500
Wire Wire Line
9100 4500 9100 4400
Wire Wire Line
4350 2500 6000 2500
Connection ~ 4350 2500
Connection ~ 7500 2500
$Comp
L Device:R R16
U 1 1 6081144D
P 7750 2200
F 0 "R16" V 7543 2200 50 0000 C CNN
F 1 "10mOhm" V 7634 2200 50 0000 C CNN
F 2 "Resistor_SMD:R_1210_3225Metric" V 7680 2200 50 0001 C CNN
F 3 "~" H 7750 2200 50 0001 C CNN
1 7750 2200
0 1 1 0
$EndComp
Wire Wire Line
7500 2500 7500 2200
Wire Wire Line
7500 2200 7600 2200
Wire Wire Line
8000 2500 8000 2200
Wire Wire Line
8000 2200 7900 2200
Connection ~ 8000 2500
Wire Wire Line
9300 2500 8000 2500
Wire Wire Line
6100 2000 6000 2000
Wire Wire Line
6000 2000 6000 2500
Connection ~ 6000 2500
Text Notes 8750 3600 0 50 ~ 0
10 A * 5 mΩ = 50 mV\nVoltage Gain G = 56\n=> 56 * 0.05 V = 2.80 V @ 10 A\n\nI = U_adc / G / R_s\n\nf_g = 1/(2*pi * R *C) = 605 Hz
Wire Wire Line
1500 6750 1600 6750
$Comp
L power:GND #PWR010
U 1 1 6085BA39
P 2500 7050
F 0 "#PWR010" H 2500 6800 50 0001 C CNN
F 1 "GND" H 2505 6877 50 0000 C CNN
F 2 "" H 2500 7050 50 0001 C CNN
F 3 "" H 2500 7050 50 0001 C CNN
1 2500 7050
1 0 0 -1
$EndComp
Wire Wire Line
2500 7050 2500 7000
$Comp
L Device:R R8
U 1 1 6085DBDD
P 2500 6250
F 0 "R8" H 2570 6296 50 0000 L CNN
F 1 "100" H 2570 6205 50 0000 L CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 2430 6250 50 0001 C CNN
F 3 "~" H 2500 6250 50 0001 C CNN
1 2500 6250
1 0 0 -1
$EndComp
$Comp
L Device:R R6
U 1 1 6085E68A
P 2000 6250
F 0 "R6" H 2070 6296 50 0000 L CNN
F 1 "10k" H 2070 6205 50 0000 L CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 1930 6250 50 0001 C CNN
F 3 "~" H 2000 6250 50 0001 C CNN
1 2000 6250
1 0 0 -1
$EndComp
Wire Wire Line
2000 6400 2000 6500
Wire Wire Line
2000 6500 2500 6500
Wire Wire Line
2500 6500 2500 6400
Wire Wire Line
2500 6550 2500 6500
Connection ~ 2500 6500
$Comp
L Device:C C5
U 1 1 60862D16
P 2500 5750
F 0 "C5" H 2615 5796 50 0000 L CNN
F 1 "1μF" H 2615 5705 50 0000 L CNN
F 2 "Capacitor_SMD:C_0805_2012Metric" H 2538 5600 50 0001 C CNN
F 3 "~" H 2500 5750 50 0001 C CNN
1 2500 5750
1 0 0 -1
$EndComp
$Comp
L Device:C C6
U 1 1 60863863
P 3000 6250
F 0 "C6" H 3115 6296 50 0000 L CNN
F 1 "10μF/60V" H 3115 6205 50 0000 L CNN
F 2 "Capacitor_THT:CP_Radial_D6.3mm_P2.50mm" H 3038 6100 50 0001 C CNN
F 3 "~" H 3000 6250 50 0001 C CNN
1 3000 6250
1 0 0 -1
$EndComp
$Comp
L Diode:LL4148 D3
U 1 1 608642C7
P 2750 5500
F 0 "D3" H 2750 5717 50 0000 C CNN
F 1 "LL4148" H 2750 5626 50 0000 C CNN
F 2 "Diode_SMD:D_MiniMELF" H 2750 5325 50 0001 C CNN
F 3 "http://www.vishay.com/docs/85557/ll4148.pdf" H 2750 5500 50 0001 C CNN
1 2750 5500
-1 0 0 -1
$EndComp
$Comp
L Diode:LL4148 D1
U 1 1 608648D4
P 2250 5500
F 0 "D1" H 2250 5717 50 0000 C CNN
F 1 "LL4148" H 2250 5626 50 0000 C CNN
F 2 "Diode_SMD:D_MiniMELF" H 2250 5325 50 0001 C CNN
F 3 "http://www.vishay.com/docs/85557/ll4148.pdf" H 2250 5500 50 0001 C CNN
1 2250 5500
-1 0 0 -1
$EndComp
Wire Wire Line
2400 5500 2500 5500
Wire Wire Line
2500 5600 2500 5500
Connection ~ 2500 5500
Wire Wire Line
2500 5500 2600 5500
Wire Wire Line
2500 5900 2500 6100
Wire Wire Line
2000 6100 2000 5500
Wire Wire Line
2000 5500 2100 5500
Wire Wire Line
2900 5500 3000 5500
Wire Wire Line
3000 5500 3000 6100
Wire Wire Line
3000 6400 3000 7000
Wire Wire Line
3000 7000 2500 7000
Connection ~ 2500 7000
Wire Wire Line
2500 7000 2500 6950
$Comp
L power:+VSW #PWR011
U 1 1 6087AA11
P 3000 5400
F 0 "#PWR011" H 3000 5250 50 0001 C CNN
F 1 "+VSW" H 3015 5573 50 0000 C CNN
F 2 "" H 3000 5400 50 0001 C CNN
F 3 "" H 3000 5400 50 0001 C CNN
1 3000 5400
1 0 0 -1
$EndComp
Wire Wire Line
3000 5400 3000 5500
Connection ~ 3000 5500
Text GLabel 6100 2000 2 50 BiDi ~ 0
Bat+
Text GLabel 10500 2500 2 50 Output ~ 0
Load+
Text GLabel 1900 5500 0 50 BiDi ~ 0
Bat+
Wire Wire Line
1900 5500 2000 5500
Connection ~ 2000 5500
Text Notes 1550 7650 0 50 ~ 0
Pulses at ChargePump should be about 100 μs long.\nPeriod should be 1 to 10 ms.\n\nInitial charging takes about 500 ms.
Text Notes 1600 5050 0 50 ~ 0
Voltage doubler for high-side FET switching
$Comp
L Device:R R4
U 1 1 608886B2
P 1750 6750
F 0 "R4" V 1543 6750 50 0000 C CNN
F 1 "10k" V 1634 6750 50 0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 1680 6750 50 0001 C CNN
F 3 "~" H 1750 6750 50 0001 C CNN
1 1750 6750
0 1 1 0
$EndComp
Wire Wire Line
1900 6750 2200 6750
Text Notes 3850 7600 0 50 ~ 0
Note: if both Solar_Sw_n and Load_Sw_n are Low\n(i.e. the Power FETs are off), the Charge Pump can\nbe stopped to save some power.
$Comp
L Transistor_FET:2N7002 Q4
U 1 1 608A3F30
P 2400 6750
F 0 "Q4" H 2604 6796 50 0000 L CNN
F 1 "2N7002" H 2604 6705 50 0000 L CNN
F 2 "Package_TO_SOT_SMD:SOT-23" H 2600 6675 50 0001 L CIN
F 3 "https://www.onsemi.com/pub/Collateral/NDS7002A-D.PDF" H 2400 6750 50 0001 L CNN
1 2400 6750
1 0 0 -1
$EndComp
$Comp
L Device:R R14
U 1 1 608AD902
P 6000 2750
F 0 "R14" H 6070 2796 50 0000 L CNN
F 1 "220k" H 6070 2705 50 0000 L CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 5930 2750 50 0001 C CNN
F 3 "~" H 6000 2750 50 0001 C CNN
1 6000 2750
1 0 0 -1
$EndComp
$Comp
L Device:R R15
U 1 1 608ADE42
P 6000 3250
F 0 "R15" H 6070 3296 50 0000 L CNN
F 1 "22k" H 6070 3205 50 0000 L CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 5930 3250 50 0001 C CNN
F 3 "~" H 6000 3250 50 0001 C CNN
1 6000 3250
1 0 0 -1
$EndComp
$Comp
L power:GND #PWR015
U 1 1 608AE36D
P 6000 3500
F 0 "#PWR015" H 6000 3250 50 0001 C CNN
F 1 "GND" H 6005 3327 50 0000 C CNN
F 2 "" H 6000 3500 50 0001 C CNN
F 3 "" H 6000 3500 50 0001 C CNN
1 6000 3500
1 0 0 -1
$EndComp
Wire Wire Line
6000 3500 6000 3450
Wire Wire Line
6000 3100 6000 3000
Wire Wire Line
6000 2600 6000 2500
$Comp
L Device:C C9
U 1 1 608B8421
P 6500 3250
F 0 "C9" H 6615 3296 50 0000 L CNN
F 1 "10nF" H 6615 3205 50 0000 L CNN
F 2 "Capacitor_SMD:C_0603_1608Metric" H 6538 3100 50 0001 C CNN
F 3 "~" H 6500 3250 50 0001 C CNN
1 6500 3250
1 0 0 -1
$EndComp
Wire Wire Line
6500 3400 6500 3450
Wire Wire Line
6500 3450 6000 3450
Connection ~ 6000 3450
Wire Wire Line
6000 3450 6000 3400
Wire Wire Line
6500 3100 6500 3000
Wire Wire Line
6500 3000 6000 3000
Connection ~ 6000 3000
Wire Wire Line
6000 3000 6000 2900
Wire Wire Line
6000 2500 7500 2500
Wire Wire Line
6950 3000 6500 3000
Connection ~ 6500 3000
Text Notes 3100 5450 0 50 ~ 0
VSW ≤ 2*Vbat - 1,4V
$Comp
L Device:R R10
U 1 1 608CA737
P 3650 6250
F 0 "R10" H 3720 6296 50 0000 L CNN
F 1 "1M" H 3720 6205 50 0000 L CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 3580 6250 50 0001 C CNN
F 3 "~" H 3650 6250 50 0001 C CNN
1 3650 6250
1 0 0 -1
$EndComp
$Comp
L Device:R R11
U 1 1 608CAC3F
P 3650 6750
F 0 "R11" H 3720 6796 50 0000 L CNN
F 1 "47k" H 3720 6705 50 0000 L CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 3580 6750 50 0001 C CNN
F 3 "~" H 3650 6750 50 0001 C CNN
1 3650 6750
1 0 0 -1
$EndComp
Wire Wire Line
3650 6600 3650 6500
$Comp
L Device:C C7
U 1 1 608CAC55
P 4000 6750
F 0 "C7" H 4115 6796 50 0000 L CNN
F 1 "10nF" H 4115 6705 50 0000 L CNN
F 2 "Capacitor_SMD:C_0603_1608Metric" H 4038 6600 50 0001 C CNN
F 3 "~" H 4000 6750 50 0001 C CNN
1 4000 6750
1 0 0 -1
$EndComp
Wire Wire Line
4000 6900 4000 7000
Wire Wire Line
4000 7000 3650 7000
Wire Wire Line
3650 7000 3650 6900
Wire Wire Line
4000 6600 4000 6500
Wire Wire Line
4000 6500 3650 6500
Connection ~ 3650 6500
Wire Wire Line
3650 6500 3650 6400
Wire Wire Line
4450 6500 4000 6500
Connection ~ 4000 6500
Wire Wire Line
3650 7000 3000 7000
Connection ~ 3650 7000
Connection ~ 3000 7000
Wire Wire Line
3650 6100 3650 5500
Wire Wire Line
3650 5500 3200 5500
Wire Wire Line
2250 2000 2600 2000
Connection ~ 2600 2000
Wire Wire Line
2900 2000 2600 2000
Wire Wire Line
2900 2100 2900 2000
$Comp
L Device:R R9
U 1 1 60928B87
P 2900 2250
F 0 "R9" H 2830 2204 50 0000 R CNN
F 1 "100k" H 2830 2295 50 0000 R CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 2830 2250 50 0001 C CNN
F 3 "~" H 2900 2250 50 0001 C CNN
1 2900 2250
-1 0 0 1
$EndComp
Connection ~ 2250 2000
Wire Wire Line
2250 1850 2250 2000
Wire Wire Line
2250 1550 2250 1400
Wire Wire Line
2250 950 2250 1000
Connection ~ 2250 950
Wire Wire Line
2150 950 2250 950
Connection ~ 1750 1200
Wire Wire Line
1750 950 1850 950
Wire Wire Line
1750 1200 1750 950
$Comp
L Device:R R5
U 1 1 6090AC2B
P 2000 950
F 0 "R5" V 2207 950 50 0000 C CNN
F 1 "100k" V 2116 950 50 0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 1930 950 50 0001 C CNN
F 3 "~" H 2000 950 50 0001 C CNN
1 2000 950
0 -1 -1 0
$EndComp
$Comp
L power:GND #PWR08
U 1 1 6090A86E
P 1750 2000
F 0 "#PWR08" H 1750 1750 50 0001 C CNN
F 1 "GND" H 1755 1827 50 0000 C CNN
F 2 "" H 1750 2000 50 0001 C CNN
F 3 "" H 1750 2000 50 0001 C CNN
1 1750 2000
1 0 0 -1
$EndComp
Wire Wire Line
1750 1900 1750 2000
Wire Wire Line
1750 1200 1950 1200
Wire Wire Line
1750 1500 1750 1200
Wire Wire Line
2250 900 2250 950
$Comp
L Transistor_FET:BSS84 Q2
U 1 1 608E2AB4
P 2150 1200
F 0 "Q2" H 2354 1154 50 0000 L CNN
F 1 "BSS84" H 2354 1245 50 0000 L CNN
F 2 "Package_TO_SOT_SMD:SOT-23" H 2350 1125 50 0001 L CIN
F 3 "http://assets.nexperia.com/documents/data-sheet/BSS84.pdf" H 2150 1200 50 0001 L CNN
1 2150 1200
1 0 0 1
$EndComp
$Comp
L Transistor_FET:2N7002 Q1
U 1 1 608A7BB3
P 1650 1700
F 0 "Q1" H 1854 1746 50 0000 L CNN
F 1 "2N7002" H 1854 1655 50 0000 L CNN
F 2 "Package_TO_SOT_SMD:SOT-23" H 1850 1625 50 0001 L CIN
F 3 "https://www.onsemi.com/pub/Collateral/NDS7002A-D.PDF" H 1650 1700 50 0001 L CNN
1 1650 1700
1 0 0 -1
$EndComp
Wire Wire Line
1400 1700 1450 1700
Wire Wire Line
1050 1700 1100 1700
$Comp
L Device:R R1
U 1 1 6088F7A2
P 1250 1700
F 0 "R1" V 1043 1700 50 0000 C CNN
F 1 "10k" V 1134 1700 50 0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 1180 1700 50 0001 C CNN
F 3 "~" H 1250 1700 50 0001 C CNN
1 1250 1700
0 1 1 0
$EndComp
Text GLabel 1000 2500 0 50 Input ~ 0
Solar+
Wire Wire Line
2600 2100 2600 2000
Wire Wire Line
2600 2500 2450 2500
Connection ~ 2600 2500
Wire Wire Line
2600 2400 2600 2500
$Comp
L Device:D_Zener D2
U 1 1 60840C7E
P 2600 2250
F 0 "D2" V 2554 2330 50 0000 L CNN
F 1 "16V" V 2645 2330 50 0000 L CNN
F 2 "Diode_SMD:D_MiniMELF" H 2600 2250 50 0001 C CNN
F 3 "~" H 2600 2250 50 0001 C CNN
1 2600 2250
0 1 1 0
$EndComp
Wire Wire Line
2250 2200 2250 2000
$Comp
L power:+VSW #PWR09
U 1 1 6083ACE2
P 2250 900
F 0 "#PWR09" H 2250 750 50 0001 C CNN
F 1 "+VSW" H 2265 1073 50 0000 C CNN
F 2 "" H 2250 900 50 0001 C CNN
F 3 "" H 2250 900 50 0001 C CNN
1 2250 900
1 0 0 -1
$EndComp
$Comp
L Device:R R7
U 1 1 608382DF
P 2250 1700
F 0 "R7" H 2180 1654 50 0000 R CNN
F 1 "10k" H 2180 1745 50 0000 R CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 2180 1700 50 0001 C CNN
F 3 "~" H 2250 1700 50 0001 C CNN
1 2250 1700
-1 0 0 1
$EndComp
Wire Wire Line
1000 2500 1150 2500
$Comp
L Device:Q_NMOS_GDS Q3
U 1 1 607F47B1
P 2250 2400
F 0 "Q3" V 2499 2400 50 0000 C CNN
F 1 "IRFS7437PBF" V 2590 2400 50 0000 C CNN
F 2 "Package_TO_SOT_SMD:TO-263-3_TabPin2" H 2450 2500 50 0001 C CNN
F 3 "~" H 2250 2400 50 0001 C CNN
1 2250 2400
0 -1 1 0
$EndComp
Wire Wire Line
9700 2500 9850 2500
Wire Wire Line
9500 2000 9850 2000
Connection ~ 9850 2000
Wire Wire Line
10150 2000 9850 2000
Wire Wire Line
10150 2100 10150 2000
$Comp
L Device:R R22
U 1 1 6094D83E
P 10150 2250
F 0 "R22" H 10080 2204 50 0000 R CNN
F 1 "100k" H 10080 2295 50 0000 R CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 10080 2250 50 0001 C CNN
F 3 "~" H 10150 2250 50 0001 C CNN
1 10150 2250
-1 0 0 1
$EndComp
Wire Wire Line
9500 1850 9500 2000
Wire Wire Line
9500 1550 9500 1400
Wire Wire Line
9500 950 9500 1000
Connection ~ 9500 950
Wire Wire Line
9400 950 9500 950
Connection ~ 9000 1200
Wire Wire Line
9000 950 9100 950
Wire Wire Line
9000 1200 9000 950
$Comp
L Device:R R20
U 1 1 6094D851
P 9250 950
F 0 "R20" V 9457 950 50 0000 C CNN
F 1 "100k" V 9366 950 50 0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 9180 950 50 0001 C CNN
F 3 "~" H 9250 950 50 0001 C CNN
1 9250 950
0 -1 -1 0
$EndComp
$Comp
L power:GND #PWR021
U 1 1 6094D85B
P 9000 2000
F 0 "#PWR021" H 9000 1750 50 0001 C CNN
F 1 "GND" H 9005 1827 50 0000 C CNN
F 2 "" H 9000 2000 50 0001 C CNN
F 3 "" H 9000 2000 50 0001 C CNN
1 9000 2000
1 0 0 -1
$EndComp
Wire Wire Line
9000 1200 9200 1200
Wire Wire Line
9000 1500 9000 1200
Wire Wire Line
9500 900 9500 950
$Comp
L Transistor_FET:BSS84 Q7
U 1 1 6094D869
P 9400 1200
F 0 "Q7" H 9604 1154 50 0000 L CNN
F 1 "BSS84" H 9604 1245 50 0000 L CNN
F 2 "Package_TO_SOT_SMD:SOT-23" H 9600 1125 50 0001 L CIN
F 3 "http://assets.nexperia.com/documents/data-sheet/BSS84.pdf" H 9400 1200 50 0001 L CNN
1 9400 1200
1 0 0 1
$EndComp
$Comp
L Transistor_FET:2N7002 Q6
U 1 1 6094D873
P 8900 1700
F 0 "Q6" H 9104 1746 50 0000 L CNN
F 1 "2N7002" H 9104 1655 50 0000 L CNN
F 2 "Package_TO_SOT_SMD:SOT-23" H 9100 1625 50 0001 L CIN
F 3 "https://www.onsemi.com/pub/Collateral/NDS7002A-D.PDF" H 8900 1700 50 0001 L CNN
1 8900 1700
1 0 0 -1
$EndComp
Wire Wire Line
8650 1700 8700 1700
Wire Wire Line
8300 1700 8350 1700
$Comp
L Device:R R18
U 1 1 6094D87F
P 8500 1700
F 0 "R18" V 8293 1700 50 0000 C CNN
F 1 "10k" V 8384 1700 50 0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 8430 1700 50 0001 C CNN
F 3 "~" H 8500 1700 50 0001 C CNN
1 8500 1700
0 1 1 0
$EndComp
Wire Wire Line
9850 2100 9850 2000
$Comp
L Device:D_Zener D4
U 1 1 6094D88B
P 9850 2250
F 0 "D4" V 9804 2330 50 0000 L CNN
F 1 "16V" V 9895 2330 50 0000 L CNN
F 2 "Diode_SMD:D_MiniMELF" H 9850 2250 50 0001 C CNN
F 3 "~" H 9850 2250 50 0001 C CNN
1 9850 2250
0 1 1 0
$EndComp
Wire Wire Line
9500 2200 9500 2000
$Comp
L power:+VSW #PWR025
U 1 1 6094D896
P 9500 900
F 0 "#PWR025" H 9500 750 50 0001 C CNN
F 1 "+VSW" H 9515 1073 50 0000 C CNN
F 2 "" H 9500 900 50 0001 C CNN
F 3 "" H 9500 900 50 0001 C CNN
1 9500 900
1 0 0 -1
$EndComp
$Comp
L Device:R R21
U 1 1 6094D8A0
P 9500 1700
F 0 "R21" H 9430 1654 50 0000 R CNN
F 1 "10k" H 9430 1745 50 0000 R CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 9430 1700 50 0001 C CNN
F 3 "~" H 9500 1700 50 0001 C CNN
1 9500 1700
-1 0 0 1
$EndComp
Wire Wire Line
10150 2400 10150 2500
Connection ~ 10150 2500
Wire Wire Line
10150 2500 10500 2500
Wire Wire Line
9850 2400 9850 2500
Connection ~ 9850 2500
Wire Wire Line
9850 2500 10150 2500
Connection ~ 9500 2000
Wire Wire Line
9000 2000 9000 1900
$Comp
L Device:R R2
U 1 1 6097F850
P 1600 2750
F 0 "R2" H 1670 2796 50 0000 L CNN
F 1 "330k" H 1670 2705 50 0000 L CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 1530 2750 50 0001 C CNN
F 3 "~" H 1600 2750 50 0001 C CNN
1 1600 2750
1 0 0 -1
$EndComp
$Comp
L Device:R R3
U 1 1 6097FE3A
P 1600 3250
F 0 "R3" H 1670 3296 50 0000 L CNN
F 1 "22k" H 1670 3205 50 0000 L CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 1530 3250 50 0001 C CNN
F 3 "~" H 1600 3250 50 0001 C CNN
1 1600 3250
1 0 0 -1
$EndComp
$Comp
L power:GND #PWR07
U 1 1 6097FE44
P 1600 3500
F 0 "#PWR07" H 1600 3250 50 0001 C CNN
F 1 "GND" H 1605 3327 50 0000 C CNN
F 2 "" H 1600 3500 50 0001 C CNN
F 3 "" H 1600 3500 50 0001 C CNN
1 1600 3500
1 0 0 -1
$EndComp
Wire Wire Line
1600 3500 1600 3450
Wire Wire Line
1600 3100 1600 3000
Wire Wire Line
1600 2600 1600 2500
$Comp
L Device:C C4
U 1 1 6097FE51
P 1950 3250
F 0 "C4" H 2065 3296 50 0000 L CNN
F 1 "10nF" H 2065 3205 50 0000 L CNN
F 2 "Capacitor_SMD:C_0603_1608Metric" H 1988 3100 50 0001 C CNN
F 3 "~" H 1950 3250 50 0001 C CNN
1 1950 3250
1 0 0 -1
$EndComp
Wire Wire Line
1950 3400 1950 3450
Wire Wire Line
1950 3450 1600 3450
Connection ~ 1600 3450
Wire Wire Line
1600 3450 1600 3400
Wire Wire Line
1950 3100 1950 3000
Wire Wire Line
1950 3000 1600 3000
Connection ~ 1600 3000
Wire Wire Line
1600 3000 1600 2900
Wire Wire Line
2500 3000 1950 3000
Connection ~ 1950 3000
Connection ~ 1600 2500
Wire Wire Line
1600 2500 2050 2500
Text Notes 1000 3950 0 50 ~ 0
Measure the solar input voltage to determine\nwhen the sun is shining in power-saving mode.
Text Notes 4300 7100 0 50 ~ 0
Measure the charge pump output to determine whether\nit is safe to turn on the power MOSFETs (U_SW > U_Bat + 8V).
Wire Wire Line
2600 2500 2900 2500
Wire Wire Line
2900 2400 2900 2500
Connection ~ 2900 2500
Wire Wire Line
2900 2500 3050 2500
$Comp
L Device:Q_NMOS_GDS Q5
U 1 1 609B14E5
P 3250 2400
F 0 "Q5" V 3499 2400 50 0000 C CNN
F 1 "IRFS7437PBF" V 3590 2400 50 0000 C CNN
F 2 "Package_TO_SOT_SMD:TO-263-3_TabPin2" H 3450 2500 50 0001 C CNN
F 3 "~" H 3250 2400 50 0001 C CNN
1 3250 2400
0 1 1 0
$EndComp
Wire Wire Line
3450 2500 3850 2500
Wire Wire Line
3250 2200 3250 2000
Wire Wire Line
3250 2000 2900 2000
Connection ~ 2900 2000
Text Notes 2700 1700 0 50 ~ 0
Using two power FETs to block reverse currents from\nbattery to solar panel through the body diode.
$Comp
L Device:Varistor RV1
U 1 1 609BAD13
P 1150 3000
F 0 "RV1" H 1253 3046 50 0000 L CNN
F 1 "56V" H 1253 2955 50 0000 L CNN
F 2 "Varistor:RV_Disc_D12mm_W4.4mm_P7.5mm" V 1080 3000 50 0001 C CNN
F 3 "~" H 1150 3000 50 0001 C CNN
1 1150 3000
1 0 0 -1
$EndComp
Wire Wire Line
1150 2850 1150 2500
Connection ~ 1150 2500
Wire Wire Line
1150 2500 1600 2500
Wire Wire Line
1150 3150 1150 3450
Wire Wire Line
1150 3450 1600 3450
Text GLabel 6750 6050 2 50 Output ~ 0
Meas_U_SW
Text GLabel 6750 5300 2 50 Output ~ 0
Meas_U_Solar
Text GLabel 1050 1700 0 50 Input ~ 0
Solar_Sw
Text GLabel 7100 4000 1 50 Output ~ 0
Meas_I_Solar
Text GLabel 9950 5650 2 50 Output ~ 0
Meas_U_Bat
Text GLabel 8300 1700 0 50 Input ~ 0
Load_Sw
Text GLabel 10700 4000 1 50 Output ~ 0
Meas_I_Load
Text GLabel 1500 6750 0 50 Input ~ 0
ChargePump
Text Notes 2350 3200 0 50 ~ 0
3.3V @ 52.8V Solar
Text Notes 6400 2850 0 50 ~ 0
3.3V @ 36.3 V Bat
Text Notes 4400 6700 0 50 ~ 0
3.3V @ 73.5 V SW
$Comp
L power:PWR_FLAG #FLG03
U 1 1 609B3D15
P 3200 5600
F 0 "#FLG03" H 3200 5675 50 0001 C CNN
F 1 "PWR_FLAG" H 3200 5773 50 0000 C CNN
F 2 "" H 3200 5600 50 0001 C CNN
F 3 "~" H 3200 5600 50 0001 C CNN
1 3200 5600
-1 0 0 1
$EndComp
Wire Wire Line
3200 5600 3200 5500
Connection ~ 3200 5500
Wire Wire Line
3200 5500 3000 5500
$Comp
L Amplifier_Operational:MCP6424 U4
U 1 1 60867AE2
P 6600 4100
F 0 "U4" H 6600 4467 50 0000 C CNN
F 1 "MCP6424" H 6600 4376 50 0000 C CNN
F 2 "Package_SO:SO-14_3.9x8.65mm_P1.27mm" H 6550 4200 50 0001 C CNN
F 3 "https://ww1.microchip.com/downloads/en/DeviceDoc/20005165B.pdf" H 6650 4300 50 0001 C CNN
1 6600 4100
1 0 0 -1
$EndComp
$Comp
L Amplifier_Operational:MCP6424 U4
U 2 1 60868B8F
P 10200 4100
F 0 "U4" H 10200 4467 50 0000 C CNN
F 1 "MCP6424" H 10200 4376 50 0000 C CNN
F 2 "Package_SO:SO-14_3.9x8.65mm_P1.27mm" H 10150 4200 50 0001 C CNN
F 3 "https://ww1.microchip.com/downloads/en/DeviceDoc/20005165B.pdf" H 10250 4300 50 0001 C CNN
2 10200 4100
1 0 0 -1
$EndComp
$Comp
L Amplifier_Operational:MCP6424 U4
U 3 1 6086A531
P 6250 5300
F 0 "U4" H 6250 5667 50 0000 C CNN
F 1 "MCP6424" H 6250 5576 50 0000 C CNN
F 2 "Package_SO:SO-14_3.9x8.65mm_P1.27mm" H 6200 5400 50 0001 C CNN
F 3 "https://ww1.microchip.com/downloads/en/DeviceDoc/20005165B.pdf" H 6300 5500 50 0001 C CNN
3 6250 5300
1 0 0 -1
$EndComp
$Comp
L Amplifier_Operational:MCP6424 U4
U 4 1 6086B382
P 6250 6050
F 0 "U4" H 6250 6417 50 0000 C CNN
F 1 "MCP6424" H 6250 6326 50 0000 C CNN
F 2 "Package_SO:SO-14_3.9x8.65mm_P1.27mm" H 6200 6150 50 0001 C CNN
F 3 "https://ww1.microchip.com/downloads/en/DeviceDoc/20005165B.pdf" H 6300 6250 50 0001 C CNN
4 6250 6050
1 0 0 -1
$EndComp
$Comp
L Amplifier_Operational:MCP6424 U4
U 5 1 6086D340
P 7750 5650
F 0 "U4" H 7708 5696 50 0000 L CNN
F 1 "MCP6424" H 7708 5605 50 0000 L CNN
F 2 "Package_SO:SO-14_3.9x8.65mm_P1.27mm" H 7700 5750 50 0001 C CNN
F 3 "https://ww1.microchip.com/downloads/en/DeviceDoc/20005165B.pdf" H 7800 5850 50 0001 C CNN
5 7750 5650
1 0 0 -1
$EndComp
$Comp
L power:+5V #PWR016
U 1 1 6087B173
P 7650 5150
F 0 "#PWR016" H 7650 5000 50 0001 C CNN
F 1 "+5V" H 7665 5323 50 0000 C CNN
F 2 "" H 7650 5150 50 0001 C CNN
F 3 "" H 7650 5150 50 0001 C CNN
1 7650 5150
1 0 0 -1
$EndComp
$Comp
L power:GND #PWR017
U 1 1 6087B7DB
P 7650 5950
F 0 "#PWR017" H 7650 5700 50 0001 C CNN
F 1 "GND" H 7655 5777 50 0000 C CNN
F 2 "" H 7650 5950 50 0001 C CNN
F 3 "" H 7650 5950 50 0001 C CNN
1 7650 5950
1 0 0 -1
$EndComp
Wire Wire Line
6550 6050 6650 6050
Wire Wire Line
6650 6050 6650 6350
Wire Wire Line
6650 6350 5850 6350
Wire Wire Line
5850 6350 5850 6150
Wire Wire Line
5850 6150 5950 6150
Wire Wire Line
6650 5300 6650 5600
Wire Wire Line
6650 5600 5850 5600
Wire Wire Line
5850 5600 5850 5400
Wire Wire Line
10600 4100 10600 4400
Wire Wire Line
10600 4400 9800 4400
Wire Wire Line
9800 4400 9800 4200
Wire Wire Line
7000 4100 7000 4400
Wire Wire Line
7000 4400 6200 4400
Wire Wire Line
6200 4400 6200 4200
Wire Wire Line
6200 4200 6300 4200
Wire Wire Line
9900 4200 9800 4200
Wire Wire Line
5850 5400 5950 5400
Wire Wire Line
6550 5300 6650 5300
Wire Wire Line
6900 4100 7000 4100
Wire Wire Line
10500 4100 10600 4100
Wire Wire Line
6750 5300 6650 5300
Connection ~ 6650 5300
Wire Wire Line
6750 6050 6650 6050
Connection ~ 6650 6050
Wire Wire Line
10700 4100 10600 4100
Connection ~ 10600 4100
Wire Wire Line
7100 4100 7000 4100
Connection ~ 7000 4100
Wire Wire Line
7100 4100 7100 4000
Wire Wire Line
5850 4000 6300 4000
Wire Wire Line
9450 4000 9900 4000
Wire Wire Line
10700 4000 10700 4100
Wire Wire Line
5950 5200 5450 5200
Wire Wire Line
5950 5950 5450 5950
Text Label 5450 5200 0 50 ~ 0
Raw_U_Solar
Text Label 5450 5950 0 50 ~ 0
Raw_U_SW
Text Label 4450 6500 2 50 ~ 0
Raw_U_SW
Text Label 2500 3000 2 50 ~ 0
Raw_U_Solar
$Comp
L Amplifier_Operational:MCP6421T-EOT U6
U 1 1 609CB9A0
P 9450 5650
F 0 "U6" H 9450 5900 50 0000 L CNN
F 1 "MCP6421T-EOT" H 9450 5800 50 0000 L CNN
F 2 "Package_TO_SOT_SMD:SOT-23-5" H 9350 5450 50 0001 L CNN
F 3 "https://ww1.microchip.com/downloads/en/DeviceDoc/20005165B.pdf" H 9450 5850 50 0001 C CNN
1 9450 5650
1 0 0 -1
$EndComp
$Comp
L power:+5V #PWR023
U 1 1 609CD09B
P 9350 5150
F 0 "#PWR023" H 9350 5000 50 0001 C CNN
F 1 "+5V" H 9365 5323 50 0000 C CNN
F 2 "" H 9350 5150 50 0001 C CNN
F 3 "" H 9350 5150 50 0001 C CNN
1 9350 5150
1 0 0 -1
$EndComp
$Comp
L power:GND #PWR024
U 1 1 609CD5B5
P 9350 5950
F 0 "#PWR024" H 9350 5700 50 0001 C CNN
F 1 "GND" H 9355 5777 50 0000 C CNN
F 2 "" H 9350 5950 50 0001 C CNN
F 3 "" H 9350 5950 50 0001 C CNN
1 9350 5950
1 0 0 -1
$EndComp
Wire Wire Line
9150 5750 9050 5750
Wire Wire Line
9050 5750 9050 6200
Wire Wire Line
9050 6200 9850 6200
Wire Wire Line
9850 6200 9850 5650
Wire Wire Line
9850 5650 9750 5650
Wire Wire Line
9950 5650 9850 5650
Connection ~ 9850 5650
Text Label 8700 5550 0 50 ~ 0
Raw_U_Bat
Wire Wire Line
8700 5550 9150 5550
Text Label 6950 3000 2 50 ~ 0
Raw_U_Bat
$Comp
L Device:C C10
U 1 1 60A0EB11
P 7900 5250
F 0 "C10" V 7648 5250 50 0000 C CNN
F 1 "100nF" V 7739 5250 50 0000 C CNN
F 2 "Capacitor_SMD:C_0603_1608Metric" H 7938 5100 50 0001 C CNN
F 3 "~" H 7900 5250 50 0001 C CNN
1 7900 5250
0 1 1 0
$EndComp
Wire Wire Line
7650 5150 7650 5250
Wire Wire Line
7750 5250 7650 5250
Connection ~ 7650 5250
Wire Wire Line
7650 5250 7650 5350
Wire Wire Line
8050 5250 8150 5250
Wire Wire Line
8150 5250 8150 5350
$Comp
L power:GND #PWR018
U 1 1 60A2C4E8
P 8150 5350
F 0 "#PWR018" H 8150 5100 50 0001 C CNN
F 1 "GND" H 8155 5177 50 0000 C CNN
F 2 "" H 8150 5350 50 0001 C CNN
F 3 "" H 8150 5350 50 0001 C CNN
1 8150 5350
1 0 0 -1
$EndComp
$Comp
L Device:C C12
U 1 1 60A2CB55
P 9600 5250
F 0 "C12" V 9348 5250 50 0000 C CNN
F 1 "100nF" V 9439 5250 50 0000 C CNN
F 2 "Capacitor_SMD:C_0603_1608Metric" H 9638 5100 50 0001 C CNN
F 3 "~" H 9600 5250 50 0001 C CNN
1 9600 5250
0 1 1 0
$EndComp
Wire Wire Line
9450 5250 9350 5250
Wire Wire Line
9750 5250 9850 5250
$Comp
L power:GND #PWR026
U 1 1 60A2D430
P 9850 5250
F 0 "#PWR026" H 9850 5000 50 0001 C CNN
F 1 "GND" H 9855 5077 50 0000 C CNN
F 2 "" H 9850 5250 50 0001 C CNN
F 3 "" H 9850 5250 50 0001 C CNN
1 9850 5250
0 -1 -1 0
$EndComp
Wire Wire Line
9350 5350 9350 5250
Wire Wire Line
9350 5250 9350 5150
Connection ~ 9350 5250
$EndSCHEMATC
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