UC3800

DESCRIPTION

The UTC UC3800 is a high performance current mode PWM

controller ideally suited for low standby power. High voltage startup

is implemented in UTC UC3800, 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 has such applications as: battery charger,

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

open-frame SMPS.

FEATURES

* 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

* OTP,OLP,OVP, LNO-OV, Brownout and V DD clamp for higher

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

规格书UC3800