50 - 150 VDC auxiliary converter with 3 outputs
Hello
We need an auxiliary converter with follwoing parameters:
Vin = 50 -150 VDC
Vout 1 = 12 VDC ±0.5 VDC, CV; Iout 1 = 60 mA; Isolation: not isolated from Vin
Vout 2 = 12 VDC ±1.0 VDC, CV; Iout 2 = 20 mA; Isolation: not isolated from Vin, but isolated from Vout 1
Vout 3 = 9 VDC ±1.0 VDC, CV; Iout 3 = 80 mA, Isolation: isolated from Vin, Vout 1 and Vout 2
Which family (or part) would you recommend or is most suitable for this new design?
Comments
Attached please find a preliminary design for your application using TinySwitch-LT. There are a couple of warnings in the design regarding the low minimum input voltage. However, the data sheet specifies that the minimum input voltage is 50 VDC, so the design might fly. A warning - that minimum voltage spec may not be 100% tested - please inquire via PI sales office..
| Attachment | Size |
|---|---|
| TinySwitch-LT Design1.pdf (751.94 KB) | 751.94 KB |
Thank you for the suggestion!
Why do you prefer the TinySwitch-LT over the LinkSwitch-TN2 family for this application (for instance the LNK3206 specifies the use of 60 - 550 VDC in its datasheet)?
For clarification, we attached a circuit diagram to show how we intend to implement the aux-supply:
| Attachment | Size |
|---|---|
| 50-150VDC Aux-Supply.pdf (13.84 KB) | 13.84 KB |
The Tiny-LT was the first product I ran into that gave more or less successful results for your application. I didn't try the Link-TN2, but re your comments, I ran a spreadsheet, and it appears to work as well, with the one proviso that you need to use the second smallest device in order to meet duty cycle limits at the low minimum operating voltage of this application.
Can you please reply to this question, because we need to go ahead with our design.