ISL6401

Synchronizing Current Mode PWM for Subscriber Line Interface Circuits (SLICs)

Device is no longer available or supported, and production has been discontinued.

Product Status: EOL

OVERVIEW

The ISL6401 adjustable frequency, low power, pulse width modulating (PWM) current mode controller is designed for a wide range of DC-DC conversion applications including boost, flyback, and isolated output configurations. The device is optimized to provide a high performance, low-cost solution for Ringing SLIC (RSLIC) ring and talk power supplies. An integrated inverter allows for easy design of negative voltage regulation circuits with a minimal amount of external components. Internal soft start minimizes start-up stress without any external components. Peak current mode control effectively handles Ring trip transients and provides inherent over-current protection.

This advanced BiCMOS design features low operating current, adjustable operating output frequency (50kHz to 600kHz), internal soft-start and a SYNC input that allows the oscillator to be locked to an external clock for noise sensitive applications. DC-DC conversion efficiency is optimized by use of a low current sense voltage. A logic level shutdown input is included, which reduces supply current to 55µA in the shutdown mode.

KEY FEATURES

  • Positive and Negative Output Regulation
  • Starting Supply Current 100µA (typ.)
  • Quiescent Current 55µA (typ.)
  • Output Frequency Range 50kHz to 600kHz
  • External Clock Synchronization
  • Fast Transient Response with Peak Current Mode Control
  • Internal Soft-Start
  • Drives N-Channel MOSFET
  • Logic Level Shutdown
  • Leading Edge Blanking
  • 1% Tolerance Voltage Reference Over Line and Temperature

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL6401
Basic Information
Production Status
EOL
Topology
Single-Ended
Control Mode
Peak Current Mode
UVLO Rising (V)
4.1
UVLO Falling (V)
3.6
VBIAS (max) (V)
7
No-Load Operating Current
3.7 mA
# of PWM Outputs
1
FET Driver Output Current Max
1 A
Max Duty Cycle (%)
50
Qualification Level
Standard

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