LED Driver Circuit with flyback transformer

[Kekkaishi]

Hello to everyone,

Currently I'm designing LED drvr cct. The specs for my design are as follow:

*********************************
Vin = 100 - 240 V
Vo = 20
Po = 100
efficiency = 80%
duty cycle = 0.45
flyback transformer, isolated and DCM
using TL5001 and optocoupler
*********************************

Attached is my circuit for the design. I need guidance from the expert or anyone on how to implement the PWM using TL5001 with opto-coupler. Is this design okay? Is the value of capacitors and resistors correct? I designing the TL5001 based on the example application using TL5001 but the example only for step down converter and low voltage. I also need someone to check my feedback design.

Sorry for my bad English.

Thank you for all your help.

 

[Kekkaishi]

Re: LED Flyback Circuit

anyone? please guide me.... Just need someone to check my schematic, the value of the feedback and PWM design.

 

[Kekkaishi]

LED Flyback Circuit

Anybody, need help at least could anybody tell me whether the connection of my optocoupler is correct or not? should I connect it to the Feedback of TL5001 or VCC. I've searched the forum but still confused.

 

[FvM]

LED Flyback Circuit

You should analyze the circuit rather than searching the forum. No current will flow through the optocoupler in the presented circuit.

 

[Kekkaishi]

LED Flyback Circuit

I'll try to analyze the circuit by referring to AN4137. I really confused on this thing and need some guide. I still learning about power electronic. Could you please help me?

In the AN4137 example, it connected the opto-coupler at two point. I want to let the variable resistor to control the current and that's why I connect it at the cathode of the led. May I know where is the correct location to connect the opto-coupler.

One more thing, in the example of TL5001 the feedback pin connects to two parallel resistor. Do I need these resistors?