深圳市中立信电子科技有限公司

NCP1337DR2G

PWM Current-Mode  Controller for Free Running  Quasi-Resonant Operation

开关控制器 PWM CONTROLLER

NCP1337DR2G Typical Applications

• AC−DC Adapters for Notebooks, etc.

• Offline Battery Chargers

• Consumer Electronics (DVD Players, Set−Top Boxes, TVs, etc.)

• Auxiliary Power Supplies (USB, Appliances, TVs, etc.)

NCP1337DR2G Features

• Free−Running Borderline/Critical Mode Quasi−Resonant Operation

• Current−Mode

• Soft−Skip Mode with Minimum Switching Frequency for Standby

• Auto−Recovery Short−Circuit Protection Independent of Auxiliary

Voltage

• Overvoltage Protection

• Brown−Out Protection

• Two Externally Triggerable Fault Comparators (one for a disable

function, and the other for a permanent latch)

• Internal 4.0 ms Soft−Start

• 500 mA Peak Current Drive Sink Capability

• 130 kHz Max Frequency

• Internal Leading Edge Blanking

• Internal Temperature Shutdown

• Direct Optocoupler Connection

• Dynamic Self−Supply with Levels of 12 V (On) and 10 V (Off)

• SPICE Models Available for TRANsient and AC Analysis

• These are Pb−Free Devices

The NCP1337DR2G NCP1337 combines a true current mode modulator and  a demagnetization detector which ensures full Borderline/Critical  Conduction Mode in any load/line conditions together with  minimum drain voltage switching (Quasi−Resonant operation).  The transformer core reset detection is done internally, without using  any external signal, due to the Soxyless concept. The frequency is  internally limited to 130 kHz, preventing the controller to operate  above the 150 kHz CISPR−22 EMI starting limit.