What IC is it?

[Jane]

I need to repair a charger, for e-bike, made by Stchargers.com.
There ,SMD IC marked  71427 seems to be faulty. That IC is marked U1 in the picture.
Input voltage seems to be on pin 6 only( there is 12V), other voltages seems to be zero.
Anyne knows what IC it is?
Thank you.

[m k]

Can't say, picture is too abstract.

[Jane]

Here is a picture

[m k]

PWM controller is an obvious first guess but details are avoiding.

[Jane]

I added few more pictures. I removed IC (I  marked  the place with red).
It is an e-bike charger SHC-8100L
The unknown IC ( marked U1 there) is size of 3x2mm

[Terry Bites]

Hmmm, an LDO seems likely....

[m k]

So pin 2 out and 3 maybe a feedback,
4 and 5 a time constant, with shut off from U2,
then 1 and 6 for power.

[ArdWar]

Whatever it is, it's:

• Driving a 650V NMOS thru Q2, so probably a PWM controller
• Pin 2 is DRV
• Not your usual SOT23-6 flyback controller since they usually have DRV on Pin 6
• Pin 5 is probably FB

[m k]

Quite a bugger, only 6 pins and half clearly known.
I'd say that get a new charger and leave this to rainy day modding project, if it's not already.

1 GND
2 GATE
3 SENSE
4 FB1
5 FB2
6 Vcc

FB seems to have at least CC, CV and zero crossing.

SENSE is not very straight forward.
Other version has through hole C1, it also have few underside traces.
Few guesses.
There underside C7 GND connects to C1, here the hole.
There Vcc and pin 3 goes to other side of the board, here 0R and C2 holes to R17 and R18 holes.
Maybe SENSE is also indicating an AC present.

TI should have all kind of oldies available, if the used chip is a copy it's probably from something older.
But all I found was one SOT23-6 secondary side PWM, UCC82742.
Maybe the chip is not in its primary use.

[m k]

Seems that "drive by" viewing revealed something.
OB2532 has quite exact pinout, some others also.
But all are for primary side, and GATE and SENSE are just regular style.

One other thought, maybe it's originally for BJT.

[Jane]

Thank you for replies.
@m k:
Can you please explain more what  you mean by
 all are for primary side, and GATE and SENSE are just regular style.
and

it's originally for BJT.
What is BJT ?

[m k]

Regular style is how typical application is connected, directly to FET and nothing else.

BJT = Bipolar Junction Transistor
FET = Field Effect Transistor

In my head transistor is transistor and FET is FET but that is not exactly accurate.