Suggest 12V to 25V DCDC for biasing photodiodes

Hi Shyam,

As the expert in your another E2E thread said, when the load or consumption is very light, or even no load, the Vout can still be regulated at the wanted value, such as 25V.

To a better selection of the right DCDC boost, more specific requirements are needed:

• 12V Vin may be a typical value, what's the Vin range?
• Is the boost used for reverse biasing photodiode only? Or will the boost have other work status that has higher load(Iout)? If so, what the max Iout?
• Are there any requirements on the Vout ripples? Such as +/- 200mV.

Thank you.

Regards

Lei

1. Vin is exactly 12V, no change or drop for range i can say it can be between 8-16V only, but typically its 12V

2. Yes the boost is only used for reverse biasing the diodes and nothing else, i am not doing any current monitoring etc

3. Yes the output ripple should be as less as possible, better if its <50mV

Hi Shyam,

Thank you for your information.

Following two devices should meet the requirements you mentioned. And their advantages are listed:

• TPS61376: low IQ
• TPS61170: small package with 6pins

Please check whether they are suitable in your application.

Again, if further check is needed, it will be better to provide more specific requirements.

Regards

Lei

can you please let me know what more specific requirements are needed, i have provided datasheet of photo diode which i will be baising, the photo diode is connected in Reverse bais and up on light falling on photo diode it would generate current pulses out.

Hi Shyam,

I mean the requirements about the wanted DCDC boost, such as max IQ, function of output shot protection, the package size, and so on.

If no specific ones, the TPS61376 or TPS61170 should work for the photo diode reverse biasing.

Regards

Lei

Thanks for your suggestion, my final schematic is as below, requesting for your kind review