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USRB01 Datasheet(PDF) 6 Page - Unisonic Technologies

Part # USRB01
Description  HIGH PRECISION CC/CV PRIMARY-SIDE PWM POWER SWITCH
PDF  7 Pages
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Manufacturer  UTC [Unisonic Technologies]
Direct Link  http://www.utc-ic.com
Logo UTC - Unisonic Technologies

USRB01 Datasheet(HTML) 6 Page - Unisonic Technologies

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USRB01
Preliminary
`
LINEAR INTEGRATED CIRCUIT
UNISONICTECHNOLOGIESCO.,LTD
6 of 7
www.unisonic.com.tw
QW-R103-080.b
OPERATION DESCRIPTION (Cont.)
Drive BJT
The driver is a push pull stage with the supply voltage VDD. It provides the driving current for the external power
bipolar transistor. The output signal is current-limited to IOUT(SOURCE).
Protection Control
Good power supply system reliability is achieved with its comprehensive protection features including VDD over
voltage protection, OTP, feedback loop open protection, Cycle-by-cycle current limiting, short circuit protection,
leading edge blanking and UVLO, etc.
VDD is supplied by transformer auxiliary winding output. The output of UTC USRB01 is shutdown when VDD drops
below VTH(OFF) and the power converter enters power on start-up sequence thereafter.



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