Tool/software:
Hello, expert,
we are currently using the scheme of TPS92682 * 1 + TPS92520 * 3, two-phase Boost +6-phase Buck constant current;
The boost voltage is 51V; PWM frequency of TPS92520: the 215hz
Load configuration is as follows:
CC1:9 white LEDs, current: 1.07A
CC2:5 yellow LEDs, current: 0.87A
CC3:2 white LEDs: current 0.87A;
CC4:7 White LED: current 1.07A
CC5: no load;
CC6: no load;
① In the actual test, when CC1 + CC4 was lit, it was found that the light flickered near the drop from 13.5V to 8V; there will be flicker when it is lower than 8V; The output voltage of the specific tps92682 is shown in the waveform, and there is a drop;What causes the output to be pulled low?
② when CC1 + CC4 + CC2 is lit, there is no flicker in 8V;
③ When CC1 is lit, there is no flicker in 8V;
The following picture is our circuit：
Please help us find out what are the possible reasons，Or tell us which direction to look for this problem. thanks
