UNI SONI C TECHNOLOGI ES CO., LTD

UC3800/B

Preliminary

LINEAR INTEGRATED CIRCUIT

www.unisonic.com.tw

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Copyright © 2018 Unisonic Technologies Co., Ltd

QW-R103-083.d

LOW COST POWER-SAV I N G

M ODE PWM CON T ROLLER

FOR FLY BACK CON V ERT ERS



DESCRI PT I ON

The UTC UC3800/B is a high performance current mode PWM

controller ideally suited for low standby power. High voltage startup

is implemented in UTC UC3800/B, which features with short

startup time and no standby current. At no load condition, the IC

operates

in

power-saving

mode

for

lower

standby

power,

decreasing frequency for higher conversion efficiency at light load

condition.

The internal slope compensation improves system stability at

high PWM duty cycle output. Leading-edge blanking on current

sense input removes the signal glitch, which offering minimal

external

component

count

in

the

design.

Excellent

EMI

performance is achieved with UTC proprietary frequency hopping

technique (ZL201020615247.1) together with soft driver control.

Audio noise is eliminated due to switch frequency more than 20kHz

during operation.

The UTC UC3800/B has such applications as: battery charger,

power adaptor, set-top box power supplies, ink jet printers,

open-frame SMPS.



FEAT U RES

SOP-8

* UTC proprietary frequency hopping technology for Improved EMI

performance.

* Power-saving mode for high light-load and standby efficiency

* Soft Start

* Dynamic peak current limiting for constant output power

* Built-in synchronized slope compensation

security

* Fixed switch frequency 65kHz

* Gate output voltage clamped at 16V

* Low start-up current

* Cycle-by-cycle Current Limiting

* Under voltage lockout (UVLO)

* Few external components required



ORDERI N G I N FORM AT I ON

Ordering Number

Lead Free

Halogen Free

Package

Packing

UC3800L-S08-R

UC3800G-S08-R

SOP-8

Tape Reel

UC3800BL-S08-R

UC3800BG-S08-R

SOP-8

Tape Reel