UB3846 datasheet(7/10 Pages) UTC

tên linh kiện	UB3846

Giải thích chi tiết về linh kiện	LOW COST POWER-SAVING MODE PWM CONTROLLER FOR FLYBACK CONVERTERS

PDF	10 Pages

Scroll/Zoom	100%

nhà sản xuất	UTC [Unisonic Technologies]

Trang chủ	http://www.utc-ic.com

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7 / 10 page

UB3846

LINEAR INTEGRATED CIRCUIT

UNISONICTECHNOLOGIESCO.,LTD

7 of 10

www.unisonic.com.tw

QW-R103-053.C

OPERATION DESCRIPTION(Cont.)

Protection Controls

The IC takes on more protection functions such as OVP and OTP etc. In case of those failure modes for continual

blanking time, the driver is shut down. Driver is reset after failure is eliminated.

OVP

The OVP will shut down the switching of the power MOSFET whenever VDD>VOVP. The OVP case as followed

FIG.3. The test circuit as followed FIG.4.

FIG.3 OVP case

FIG.4 OVP test circuit

OTP

OTP will shut down driver when junction temperature TJ>T (THR) for continual a blanking time.

PCB Layout Note

Noise from the current sense or the control signal can cause significant pulse width jitter in continuous-conduction

mode. While slope compensation helps alleviate these problems. Good placement and layout practices should be

followed. Avoiding long PCB traces and component leads, locating compensation and filter components near the

UTC UB3846, and increasing the power MOS gate resistance is advised.

UB3846 bảng dữ liệu(PDF) 7 Page - Unisonic Technologies