UC3848L-S08-R datasheet(5/11 Pages) UTC

Part #	UC3848L-S08-R

Description	HIGH PERFORMANCE CURRENT MODE CONTROLLERS

Download	11 Pages

Scroll/Zoom	100%

Manufacturer	UTC [Unisonic Technologies]

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

Logo

5 / 11 page

UC3848

LINEAR INTEGRATED CIRCUIT

UNISONICTECHNOLOGIESCO.,LTD

5 of 11

www.unisonic.com.tw

QW-R103-033.F

FUNCTIONAL DESCRIPTION

The internal reference voltages and bias circuit work at VCC> VTHD (ON), and shutdown at VCC<VCC (MIN).

(1) Soft-Start

When every IC power on, driver output duty cycle will be decided by voltage VSS on soft-start capacitor and VCS

on current sense resistor at beginning. After VSS reach 4.2V, the whole soft-start phase end, and driver duty cycle

depend on VFB and VCS. The relation among VSS, VFB and VOUT as followed FIG.3.

Furthermore, soft-start phase should end before VCC reach VCC (MIN) during VCC power on. Otherwise, if soft-start

phase remain not end before VCC reach VCC (MIN) during VCC power on, IC will enter auto-restart phase and not set up

VOUT. So the value of CSS should be between 0.1μFand 4.7μF.

Finally soft-start also set OVP1 active phase. OVP1 active phase between 0 and VSS(DEACT), OVP1 will not be

sensed after VSS reach VSS(DEACT).The Soft-start phase TSS：TSS = 23.8×CSS (ms) (Example: CSS=0.47μF, then

TSS=23.8×0.47=11.2ms).

FIG.3 Soft-start phase

Similar Part No. - UC3848L-S08-R

Manufacturer	Part #	Datasheet	Description
E-Tech Electronics LTD	UC3848L-S08-R	596Kb / 11P	HIGH PERFORMANCE CURRENT MODE CONTROLLERS
Unisonic Technologies	UC3848L-S08-R	596Kb / 11P	HIGH PERFORMANCE CURRENT MODE CONTROLLERS

Manufacturer	Part #	Datasheet	Description
Motorola, Inc	UC3842B	401Kb / 16P	HIGH PERFORMANCE CURRENT MODE CONTROLLERS
Freescale Semiconductor...	MC34129EF	444Kb / 16P	high performance current mode controllers
ON Semiconductor	UC3844BNG	399Kb / 19P	High Performance Current Mode Controllers August, 2013 ??Rev. 11
	UC3845BDR2G	387Kb / 19P	High Performance Current Mode Controllers December, 2012 ??Rev. 11
	UC3845BVDG	399Kb / 19P	High Performance Current Mode Controllers August, 2013 ??Rev. 11
	UC3845BVDR2G	399Kb / 19P	High Performance Current Mode Controllers August, 2013 ??Rev. 11
	UC3844BVDG	399Kb / 19P	High Performance Current Mode Controllers August, 2013 ??Rev. 11
Unisonic Technologies	UC3842B	518Kb / 11P	HIGH PERFORMANCE CURRENT MODE CONTROLLERS
Motorola, Inc	UC3844	376Kb / 14P	HIGH PERFORMANCE CURRENT MODE CONTROLLERS
ON Semiconductor	UC3842A	399Kb / 14P	HIGH PERFORMANCE CURRENT MODE CONTROLLERS 1996 REV 1
ON Semiconductor	UC3844	376Kb / 14P	HIGH PERFORMANCE CURRENT MODE CONTROLLERS 1996 REV 1