Hi All,
i have a question regarding the measurement result of led driver output
Why does the voltage of BL_LED+ and BL_LED- different when we change the LED SET Output Register? even though the dimming mode remains the same (Please see the information of the measurement result below)
What is the principle between the dimming setting and LED Output string setting?
1. Phase shift PWM Mode ( with phase shift 69 degree "3.92kohm")
CH1 = BL_LED+ (Voltage)
Pk-Pk = 1.60V
Max = 25.20V
AVG = 24.46V
RMS = 24.46V
CH3 = BL_LED- (Voltage)
Pk-Pk = 1.24V
Max =1.76V
AVG = 839.40mV
RMS = 847.64V
2. 1. Phase shift PWM Mode ( None Phase Shift "124kohm")
CH1 = BL_LED+ (Voltage)
Pk-Pk = 4V
Max = 28.80V
AVG = 27.30mV
RMS =27.31V
CH2 = BL_LED- (Voltage)
Pk-Pk =8V
Max =8.20V
AVG =4.22V
RMS = 5.41mV
Freq = 19.32kHz
