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NCP1282 - High Performance Active Clamp/Reset PWM Controller

Description

1 Vin Connect the input line voltage directly to this pin to enable the internal startup regulator.

A constant current source supplies current from this pin to the capacitor connected to the VAUX pin, eliminating the need for a startup resistor.

Features

  • of the NCP1282 are soft- stop and a cycle skip current limit with a time threshold. Soft- stop circuitry powers down the converter in a controlled manner if a severe fault is detected. The cycle skip detector enables a soft- stop sequence if a continuous overcurrent condition is present. Additional features found in the NCP1282 include line feedforward, frequency synchronization up to 1.0 MHz, cycle- by- cycle current limit with leading edge blanking (LEB), independent under and overvoltage dete.

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Datasheet Details

Part number NCP1282
Manufacturer onsemi
File Size 442.69 KB
Description High Performance Active Clamp/Reset PWM Controller
Datasheet download datasheet NCP1282 Datasheet

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Full PDF Text Transcription

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NCP1282 High Performance Active Clamp/Reset PWM Controller Featuring 500 V Startup The NCP1282 is a voltage mode controller designed for ac- dc or dc- dc converters requiring high- efficiency and low parts count. This controller incorporates two in phase outputs with an overlap delay to prevent simultaneous conduction and facilitates soft switching. The main output is designed for driving a forward converter primary MOSFET. The secondary output is designed for driving an active clamp circuit MOSFET, a synchronous rectifier on the secondary side, or an asymmetric half bridge circuit. The NCP1282 reduces component count and system size by incorporating high accuracy on critical specifications such as maximum duty cycle limit, undervoltage detector and overcurrent threshold.
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