diff --git a/src/charge_pump.c b/src/charge_pump.c
index 825c5d3..421093e 100644
--- a/src/charge_pump.c
+++ b/src/charge_pump.c
@@ -32,7 +32,7 @@ void charge_pump_init(void)
 	timer_set_prescaler(TIM1, 48 - 1); // Timer runs at 1 MHz
 
 	// auto-reload value
-	timer_set_period(TIM1, 10000 - 1); // overflow every 10000 cycles = 100 Hz
+	timer_set_period(TIM1, 2000 - 1); // overflow every 2000 cycles = 500 Hz
 
 	// output compare value
 	timer_set_oc_value(TIM1, TIM_OC1, 100); // High for 100 cycles = 100 μs