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US3706 Datasheet(PDF) 6 Page - Unisonic Technologies

Part # US3706
Description  CURRENT MODE PWM POWER SWITCH
PDF  8 Pages
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Manufacturer  UTC [Unisonic Technologies]
Direct Link  http://www.utc-ic.com
Logo UTC - Unisonic Technologies

US3706 Datasheet(HTML) 6 Page - Unisonic Technologies

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US3706
Preliminary
CMOS IC
UNISONICTECHNOLOGIESCO.,LTD
6 of 8
www.unisonic.com.tw
QW-R129-001.b
OPERATION DESCRIPTION (Cont.)
Protection Controls
The IC takes on more protection functions such as OVP, OLP and OTP etc. In case of those failure occurs for
continual blanking time, the power MOSFET is shut down. Power MOSFET is reset after failure is eliminated.
OVP
The OVP will shut down the switching of the power MOSFET whenever VDD >VOVP. The OVP event as followed
Fig.3.
Fig.3 OVP case
Fig.4 OLP case
OLP
OLP will shut down driver when VFB> VOLP for continual a blanking time. The OLP event as followed Fig.4.
OTP
OTP will shut down driver when the NTC resistor temperature TJ>T (THR).



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