Part Number: TPS54200 Tool/software: Dear TI experts,
My customer has a problem about TPS54200.
Their product is in mass production. And Some products have failure in production test status.
When the device is in failure, they can see that GND and PWM…
Hi Customer,
I think the problem occurred here was that TPS54200 shutdown and latched during start-up in your case.
Since in real case, VIN ramps to 12V in 'ms' time because of the large input capacitor. In such connection of PWM pin, PWM voltage level…
Part Number: TPS92200 Other Parts Discussed in Thread: TPS54200 Is it possible to be sent the efficiency comparison between the TPS92200 and TPS54200 LED Drivers?
Many thanks,
Sam
Part Number: TPS54200 Hi
Debug between led+ and led-, using a 200Ω resistor
The pwm uses 3.3v direct power supply, and the lamp series uses a resistor instead, but the fb pin voltage is always 100mv
Could you please help confirm the cause
T hank…
Hi Steven,
I would like to verify again, so the TPS54200 do not has the minimum inductor current ripple requirement (for example:>300mA like TPS92200)? In other words, if max LED current is 800mA, the inductor current ripple would be 0.8A x 0.2 = 0.16A…
Hi ZL,
Thanks for your patience. We have analyzed the internal circuitry of TPS54200/1 and TPS92200. Below is our final conclusion for TPS92200 / TPS54200 output capacitor and the FB filter design.
Regarding the output capacitor location,
For TPS92200…
Part Number: TPS54200 Hello,
We are validating the TPS54200 in our boards and absorbed the below issue.
Below are the design configurations
Input Voltage - 12V
Output Voltage - 6.1V ( 2 LED in Series 3V per LED)
Output Current - 250mA (400mE used)
…
Supplement:
This is tested with the same circuit as above, except that C6 = 0.068uF is fitted.
Black curve is measured at TP7 as shown above. Light blue: SW voltage. Orange: inductor current. Dark blue: LED current.
Figure 1: 0-20% start-up capture
…