Press Center
 
Home About us Products Support Quality & Certification Career Contact us
• Power Management
    Linear Regulators
    Low Dropout Linear Regulators
    DDR Termination Regulators
    Shunt Reference Regulators
    Step Down Switching Regulators
    Switching Regulator
    Step-Up DC-DC Converter
    PWM Controller
    White LED Driver
    Supervisory Circuit
    Voltage Detection and System R
    USB Power Switch
    Power Factor Control
    Li-Battery Protection or Charg
    FET Bias Controllers
    Combo IC
    Inverting DC-DC Converter
• Amplifier / Comparator
    Audio Amplifiers
    Operational Amplifier
    Voltage Comparator
• Analog Switches
    Video Signal Switch
    Analog Multiplexers, Demultipl
• Hall ICs
• Special Application ICs
    Motor Controller IC
    Interface and Driver Circuit
    Telecommunication Circuit
    Melody IC
    Alarm /Sound Generator IC
    Remote Controller IC
    Television Circuit
    Leakage Current Detector
    Automotive IC
    A-D or D-A Converters
    Miscellaneous
    Radio and Cassette Recorder Ci
    Timer
    Mouse&Keyboard Controller
    Transient Voltage Suppressors
    Sense Monitor
    Video Filter
    ZCB snubber
• Logic
• TRANSISTORs
• MOSFETs
    JFET
    Power Mosfet
• TRIACs
• SCRs
• DIODEs
 
Home > PWM Controller
US1651 Datasheet
 PRIMARY-SIDE REGULATION PWM POWER SWITCH

 

 

 

DESCRIPTION

 

 

The UTC US1651 is a primary control switch mode charger and

adapter applications. The controlled variable is transferred by an

auxiliary winding from the secondary to the primary side. The

device integrates PWM controller  to enhance the performance of

discontinuous conduction mode (DCM) flyback converters.

The UTC  US1651  operates in primary-side sensing and

regulation. Opto-coupler and TL431 could be eliminated. It

operates in fixed frequency mode at large load conditions,

frequency reduction mode at light/medium load and ‘Extended

burst mode’ at No/light load conditions. So that low standby power

can be achieved.

The UTC  US1651  achieves high precision CV/CC regulation

and high power efficiency. It offers comprehensive protection

coverage with auto-recovery features including Cycle-by-cycle

current limiting, VDD over voltage protection, VDD clamp, OTP,

leading edge blanking, VDD under voltage lockout, etc.

  

 

FEATURES

 

* Programmable CV and CC regulation

* Primary-side sensing and regulation with No TL431 and opto-coupler

* Multi-mode operation for high efficiency

* Adjustable constant current and output power setting

* Power on soft-start time (4ms)

* Frequency shuffling and adjustable gate drive greatly improving EMI

* ”Extended burst mode control” for improved efficiency and minimum standby design

* Built-in leading edge blanking (LEB)

* VDD under voltage lockout

* VDD over voltage shutdown and clamp

* Cycle-by-Cycle current limiting

* Fail-safe protection for open loop fault condition

* Auto-restart in over voltage condition 

About us  |  Products  |  Contact us
Copyright 2011 UTC All received