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


The ISL6401 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 (Vbh) and Talk (Vbl) power supplies in VoIP applications. The IC features an integrated inverter that is ideal for generating negative output voltages like RSLIC Ring Vbh (-72V) and Talk Vbl (-24V), -48V for IP phones, -5V and -15V for DSL CO line drivers. The output voltages are adjusted with an external voltage divider.

The ISL6401EVAL1Z evaluation board is shipped “ready to use” right from the box. The IC requires +5V bias. The evaluation board input voltage can be 10V to 16V with the specified transformer and external components. The output voltages are -24V at 120mA and -72V at 120mA. The board is capable of evaluating device operation with loads that simulate one, two, three, or four line operation. The use of an electronic load enables evaluation over a wide range of operating conditions. Simply vary the load on each output from 0mA to 120mA in any combination to match exact application requirements.

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
  • Pb-free available (RoHS compliant)


  • VoIP/VoDSL ringer and off-hook voltage generators
  • Multi-output flyback supplies
  • Cable and DSL modems
  • Set-top boxes
  • Wireless local loops
  • LMDH and FTTH supplies
  • Boost regulators
  • Routers

ISL6401EVAL1Z Synchronizing Current Mode PWM for Subscriber Line Interface Circuits Evaluation Board Layout

ISL6401EVAL1Z Evaluation Board Layout

Related Products


Tool Information

Tools Orderable Part Number (s) Production Status Manufacturer Suggested Single Tool Price
Description Distributor Stock Distributors Distributor Purchase Buy Direct
ISL6401EVAL1Z Mass Production Renesas $0.00 1 0 연락대리점 -

Note: Distributor Prices may vary from the stated budgetary price. The pricing and availability information on this site is based on information provided by Renesas’ authorized distributors and is subject to change without notice. By selecting a distributor from this page, you will be redirected from the Renesas site to the distributor’s website to complete a purchase. The distributors are independent from Renesas and maintain their own terms and conditions of sale. Renesas disclaims all representations and warranties, express and implied, with respect to transactions between distributors and their end customers.