UC3873_15 datasheet(7/10 Pages) UTC

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UC3873 Datasheet(PDF) 7 Page - Unisonic Technologies

Part #	UC3873

Description	LOW COST POWER-SAVING MODE PWM CONTROLLER

Download	10 Pages

Scroll/Zoom	100%

Manufacturer	UTC [Unisonic Technologies]

Direct Link	http://www.utc-ic.com

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7 / 10 page

UC3873

LINEAR INTEGRATED CIRCUIT

UNISONICTECHNOLOGIESCO.,LTD

7 of 10

www.unisonic.com.tw

QW-R103-068. D



OPERATION DESCRIPTION (Cont.)

Protection Controls

The IC takes on more protection functions such as OVP, OLP 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 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).

PCB Layout Note

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

continuous-conduction mode, and 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 UC3873, and increasing the power MOS gate resistance is advised.

Manufacturer	Part #	Datasheet	Description
Unisonic Technologies	UC3873	263Kb / 10P	LOW COST POWER-SAVING MODE PWM CONTROLLER

Manufacturer	Part #	Datasheet	Description
Unisonic Technologies	UC3800	221Kb / 10P	LOW COST POWER-SAVING MODE PWM CONTROLLER
	UC3873A	309Kb / 10P	LOW COST POWER-SAVING MODE PWM CONTROLLER
	UC3973	353Kb / 10P	LOW COST POWER-SAVING MODE PWM CONTROLLER
	UC3800	225Kb / 10P	LOW COST POWER-SAVING MODE PWM CONTROLLER
	UC3873	263Kb / 10P	LOW COST POWER-SAVING MODE PWM CONTROLLER
	US4651S	363Kb / 9P	LOW COST POWER-SAVING MODE PWM CONTROLLER
	UC3875C	295Kb / 9P	LOW COST POWER-SAVING MODE PWM CONTROLLER
	UC3863A	342Kb / 10P	LOW COST POWER-SAVING MODE PWM CONTROLLER
	UC3875A	333Kb / 10P	LOW COST POWER-SAVING MODE PWM CONTROLLER
	UC3863	262Kb / 9P	LOW COST POWER-SAVING MODE PWM CONTROLLER
	UC3856	358Kb / 10P	LOW COST POWER-SAVING MODE PWM CONTROLLER

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