Product category:
Power Supply ICs and Controllers
News Release from: Intersil | Subject: ISL6401
Edited by the Electronicstalk Editorial
Team on 27 September 2001
PWM chip powers Internet telephony
The ISL6401 pulsewidth modulator from Intersil is specifically designed to reduce the cost of generating talk and ring voltages for telephone and cable services using VoIP or DSL technology.
The ISL6401 pulsewidth modulator from Intersil is specifically designed to reduce the cost of generating talk and ring voltages for telephone and cable services using voice-over-Internet protocol (VoIP) or digital subscriber line (DSL) technology A single ISL6401 current-mode controller can generate enough power for up to 12 ringing subscriber line interface circuits (RSLICs) such as Intersil's ISL5586, saving cost and board space
This article was originally published on Electronicstalk on 8 Jan 2001 at 8.00am (UK)
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Additionally, the ISL6401 can also be used as a standard boost controller or as a regulator for general DC/DC conversion of either positive or negative voltages.
It satisfies a wide range of design problems including boost, flyback, forward and isolated output power supply configurations etc.
VoIP appliances provide both Internet access and telephone services to a home or business.
However, because the incoming digital service cannot provide power for ringing etc, the telephone interface IC must create the proper voltages for on- and off-hook conditions and the ring signal.
The ISL6401 is an adjustable frequency, low power PWM current-mode controller that generates the required DC voltages with more than 85% conversion efficiency.
In voice-over-digital applications, the ISL6401 generates the required -24V (or -48V) for talk, and up to -120V for ringing.
A built-in inverting amplifier allows direct feedback for regulation of the negative voltages used in ringing SLIC applications and saves parts count and cost.
A logic level input reduces supply current to 55uA in the shutdown mode.
The PWM also features an adjustable operating frequency ranging from 50kHz to 600kHz, internal soft start, and a SYNC input allowing the ISL6401 oscillator to be locked to an external clock.
The ISL6401 is currently available in a 14-lead SOIC with a 4 x 4 mm MLFP package available soon.
Boost controller and flyback evaluation boards for the devices are also available.
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