作者: 84106846 时间: 2025-11-14 12:38
Input Voltage Sensing
The input power supply voltage is sampled at
VINSEN with a resistor divider (see Figure 8).
The sensed input voltage is used for PWM on
time calculation, VIN_UVLO, VIN_OVP fault
protection, VIN_UV warning and input voltage
monitoring.
In designs, the divided voltage on VINSEN
should not exceed the ADC sampling range
(1.6V) at the maximum input voltage. A 1 -
10nF ceramic capacitor from VINSEN to AGND
is recommended as an input sense filtering
capacitor (CIN) (see Figure 8).
Program the input voltage sensing divider ratio
with register MFR_VIN_SCALE_LOOP (C0h).
The calculation of the ratio (KIN) is shown in
Equation (12):
在设计中，VINSEN上的分压在最大输入电压时不应超过ADC采样范围（1.6V）。建议在VINSEN与AGND之间使用1 - 10nF的陶瓷电容作为输入检测滤波电容（CIN）（见图8）。
分压计算不超过1.6的设计范围就行
