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                  Home > PWM Controller
                  US4657 Datasheet






                  The UTC US4657 is an integrated PWM controller and Power

                  MOSFET specifically designed for current mode operation with

                  minimal external components. The UTC US4657 is designed to

                  provide several special enhancements to satisfy the needs, for

                  example, Power-Saving mode for low standby power (<0.1W),

                  Frequency Hopping , Constant Output Power Limiting , Over

                  Current Protection (OCP), Over Voltage Protection (OVP), Under

                  Voltage Lock Out (UVLO), and Over Temperature Protection (OTP)

                  etc. IC will be shutdown or can auto-restart in certain situations.




                  * Internal High Voltage Start-up Circuit

                  * Internal 650V Power MOSFET

                  * Lower than 0.1W Standby Power Design

                  * Gate Output Maximum Voltage Clamp(15V)

                  * Over temperature protection

                  * Over voltage protection

                  * Leading edge blanking

                  * Cycle-by-Cycle current limiting

                  * Under Voltage Lock Out

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