TPS552892-Q1: SCH Review

Hi Xiaowei,

May I know what is the application here? What is the input voltage range and output current?

1.Change R1105 and R1106 to 0ohm.

2.Add 0402 0.1uF ceramic cap in Vin and Vout pin and put them close to IC.

3.Change R1109 and R1111 to 1206 package for thermal consideration.

4.Please provide output cap P/N for loop calculation.

Regards,

Mulin

Hi Mulin,

Mulin Yuan said:

May I know what is the application here? What is the input voltage range and output current?

- For drive LED matrix
- input voltage range：9~16V; output voltage：11.6V; the maximum constant output current: about 1.8A； peak output current: about 7.2A

Mulin Yuan said:

4.Please provide output cap P/N for loop calculation.

- C1106:C3225X7R1E226MT0Y0S               C1107:EEHZA1E680XP           C1108:C2012X7R1H104KT0Y0S

Best Regards,

Xiaowei Zhang

Hi Xiaowei,

How long will 7.2A peak output current last? I am afraid that TPS552892-Q1 cannot support.

Regards,

Mulin

Hi Mulin

Thanks for your support.  The 7.2A peak current last time will be less than 4.2ms(per cycle: 16.6ms )

Best Regards,

Xiaowei Zhang

Hi Xiaowei,

4.2ms is steady state for DCDC already because the switching period is only 2.5us. In this case maximum output current is 7.2A, not 1.8A. Maximum average inductor current: 11.6*7.2/0.95/9=9.8A. TPS552882-Q1 is more suitable here.

Regards,

Mulin