HT1308 chip on simple cellphone SMPS

Thread Starter

Willen

Joined Nov 13, 2015
287
I found a cellphone SMPS and it has 8 pin DIP HT1308 chip. Now the SMPS failed and I am staring on the device. I tested all parts and seems fine. I am doubt on the chip. The chip seems that it's a 13008 NPN transistor but I am not sure. Please see the schematic and tell me.

I downloaded the datasheet of HT1308 DIP chip but it was written in Chinese. I have attached a schematic too.
 

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Thread Starter

Willen

Joined Nov 13, 2015
287
I guessed it's just a BJT 13008 transistor. So I am asking for conform! Can you tell me more about 'PFM'.

If the chip is not a NPN then I am wishing to use a 13008 NPN instead of the IC, maybe with little modification .
 
Last edited:

AnalogKid

Joined Aug 1, 2013
8,217
The chip is a complete switching power supply controller including the output power transistor, not a simple NPN. In this circuit it cannot be replaced by an NPN transistor of any kind.

ak
 
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