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ISL78225 - 4-Phase Interleaved Boost PWM Controller

Description

A resistor placed from FS to ground will set the PWM switching frequency.

Use this pin to set up the desired soft-start time.

Features

  • Peak current mode PWM control with adjustable slope compensation.
  • Precision resistor/DCR current sensing.
  • 2-, 3- or 4-phase operation.
  • Adjustable phase dropping/diode emulation/pulse skipping for high efficiency at light load.
  • Phase dropping facilitated with companion FET driver ISL78420 (featuring tri-level input control).
  • Adjustable switching frequency or external synchronization from 75kHz up to 1MHz per phase.
  • Over-temperature/o.

📥 Download Datasheet

Datasheet preview – ISL78225

Datasheet Details

Part number ISL78225
Manufacturer Renesas Electronics
File Size 1.22 MB
Description 4-Phase Interleaved Boost PWM Controller
Datasheet download datasheet ISL78225 Datasheet
Additional preview pages of the ISL78225 datasheet.

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Full PDF Text Transcription

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DATASHEET ISL78225 4-Phase Interleaved Boost PWM Controller with Light Load Efficiency Enhancement FN7909 Rev 4.00 September 5, 2014 The ISL78225 4-phase controller is targeted for applications where high efficiency (>95%) and high power are required. The multiphase boost converter architecture uses interleaved timing to multiply channel ripple frequency and reduce input and output ripple. Lower ripple results in fewer input/output capacitors and therefore lower component cost and smaller implementation area. The ISL78225 has a dedicated pin to initiate the phase dropping scheme for higher efficiency at light load by dropping phases based on the load current, so the switching and core losses in the converter are reduced significantly.
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