The UTC US2652SQ provides a CCM/valley switching mixed mode operation for better efficiency performance. The operation mode stays at CCM at heavy load, and switch to valley switching at light load.

The UTC US2652SQ is a high performance current mode PWM controller ideally suited for low standby power. Drain-start up cell isdesign to minimize the standby power to minimize the standby power. 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 UTC US2652SQ contains protection with automatic recovery including OLP (over load protection), OCP (cycle-by-cycle current limiting), and UVLO (VDD over voltage clamp and under voltage lockout). It also provides the protections including OTP (over temperature protection), BNO(AC Brown Out protection) , LNO(AC Over voltage protection), OVP (VCC or DC output over voltage protection) with automatic recovery. To protect the power MOSFET, Gate-drive output is fixed up to 16V max.

The internal slope compensation improves system stability at high PWM duty cycle output. Leading-edge blanking on currentsense input removes the signal glitch, which offering minimaexternal 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.

UTC US2652SQ has such applications as: battery charger, power adaptor, set-top box power supplies, ink jet printers, open-frame SMPS.

FEATURES

* Proprietary frequency hopping for Improved EMI performance

* Low standby power with only 30~70mw

* Cycle-by-cycle current limiting

* CCM/Valley Switching Operation

* Fixed switch frequency 65~85kHz

* Dynamic peak current limiting for constant output power

* Built-in synchronized slope compensation

* Gate output voltage clamped at 16V

* Adjustable DC output OVP

* OLP/VCC OVP/OTP/BNO/LNO ( automatic recovery)

* Internal Soft Start

* Halogen Free