The MC34262/MC33262 are active power factor controllers specifically designed for use as a preconverter in electronic ballast and in off−line power converter applications. These integrated circuits feature an internal startup timer for stand−alone applications, a one quadrant multiplier for near unity power factor, zero current detector to ensure critical conduction operation, transconductance error amplifier, quickstart circuit for enhanced startup, trimmed internal bandgap reference, current sensing comparator, and a totem pole output ideally suited for driving a power MOSFET. Also included are protective features consisting of an overvoltage comparator to eliminate runaway output voltage due to load removal, input undervoltage lockout with hysteresis, cycle−by−cycle current limiting, multiplier output clamp that limits maximum peak switch current, an RS latch for single pulse metering, and a drive output high state clamp for MOSFET gate protection.
The MC34262, DMC34262 and MC33262 are active power‑factor controllers designed for use as pre‑converters in electronic ballasts and off‑line power converters. They integrate a startup timer, a single‑quadrant multiplier, zero‑current detector, transconductance error amplifier, quick‑start circuit, trimmed band‑gap reference and a totem‑pole output suitable for driving power MOSFETs. Protective features include an over‑voltage comparator, undervoltage lockout with hysteresis, cycle‑by‑cycle current limiting, multiplier output clamp, RS latch for single‑pulse metering, and a high‑state clamp for MOSFET gate protection.
The datasheet provides detailed electrical characteristics, maximum ratings, and functional descriptions. It specifies operating temperature ranges, supply current, output current capabilities, and timing parameters such as restart timer delay and drive‑output rise/fall times. Application circuits and layout recommendations are also included to aid designers in implementing the devices in power‑factor correction solutions. This manual is written in Chinese.
| Total Power Supply and Zener Current (ICC + IZ) | 30 mA |
|---|---|
| Output Current (Source or Sink) | 500 mA |
| Operating Junction Temperature (TJ) | +150 °C |
| Undervoltage Lockout Startup Threshold (VCC Increasing) | 11.5 V to 14.5 V |
| Drive Output Peak Current | ±500 mA |
The devices can source or sink up to 500 mA of output current.