ISL6401EVAL1 Intersil, ISL6401EVAL1 Datasheet

ISL6401EVAL1

Manufacturer Part Number

ISL6401EVAL1

Description

EVALUATION BOARD ISL6401

Manufacturer

Intersil

Datasheets

1.ISL6401CBZ.pdf (11 pages)

2.ISL6401EVAL1.pdf (8 pages)

Specifications of ISL6401EVAL1

Main Purpose

DC/DC, Negative Inverter

Outputs And Type

2, Isolated

Power - Output

11.5W

Voltage - Output

-24V, -72V

Current - Output

120mA, 120mA

Voltage - Input

5V, 12V

Regulator Topology

Inverting

Board Type

Fully Populated

Utilized Ic / Part

ISL6401

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

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Functional Description

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 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 voltage 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.

Peak current mode control architecture effectively handles

Ring trip transients and provides inherent overcurrent

protection. Flyback topology allows the operation close to

50% duty cycle, offering optimum transformer utilization, low

ripple current and less stress on input/output capacitors.

Internal soft-start minimizes start-up stress without any

external components. The switching frequency can be

programmed from 50kHz to 600kHz or alternatively, the

internal oscillator can be locked to an external clock fed at

SYNC input for noise sensitive applications. A logic level

shutdown input is included, which reduces supply current to

55µA in the shutdown mode. DC/DC conversion efficiency is

optimized by use of a low current sense voltage.

For a detailed functional description, complete specifications

and component selection guidelines, please refer to the

ISL6401 Data Sheet (“ISL6401: Synchronizing Current

Mode PWM for Subscriber Line Interface Circuits”), Intersil

Corporation, FN9007, available on Intersil’s website,

http://www.intersil.com/data/fn/fn9007.pdf

Application Information

As worldwide demand for inexpensive Voice over Internet

Protocol telephony grows, so will the need for Integrated

Circuits that are specialized to enable compatibility between

new telephony systems and older telephones based on

analog standards. Analog ring signal generation and off

hook loop current supply are two analog functions that are

performed by Subscriber Line Interface Circuits (SLICs).

This application note discusses the special power supply

implementation to generate the high negative voltages

needed by SLICs.

Overview of Telephone Loop System

Traditionally, a telephone network consists of a circuit

between the subscriber and the central office. However, the

advent of new high speed digital technologies has created

the need to control and manage the functions of the phone

locally as opposed to the central office. In both instances the

Application Note

Using the ISL6401 RSLIC PWM Controller

1-888-INTERSIL or 1-888-468-3774

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

principals governing the operation of the phone loop are

essentially the same.

In a telephone loop, the subscriber is connected to the

network via 2 wires, commonly known as Tip and Ring. The

actual digital telecommunications trunk line however, operates

on 4 wires; two of which are allocated for transmitting and two

for receiving. This 2 to 4-wire interface consists of the SLIC

and CODEC. A SLIC is the primary interface between the

4-wire (ground referenced) low voltage switch environment

and the 2-wire (floating) high voltage loop environment. It

performs a number of important functions including Battery

feed, Overvoltage protection, Ringing, Signaling, Coding,

Hybrid Balancing and also Testing.

The Ringing SLIC (RSLIC) typically requires two high

voltage power supply inputs. The first is a tightly regulated

voltage around -24V or -48V for off-hook signal transmission.

The second is a loosely regulated -70V to -100V for ring tone

generation. When the switch hook is released the phone

puts approximately 200Ω of resistance across the phone

terminals. Intersil RSLICs feature internal current limiting so

this load is not presented to the power supply. However, not

all of the SLICs available in the market offer this feature and

the power supply is expected to maintain output during the

remainder of the ring cycle. Once voice transmission begins,

the SLIC, in many cases, requires a lower voltage input to

establish a 20mA to 25mA current loop. The loop feeds the

200Ω, protection resistors, and line resistances within the

phone. In some cases, the lower supply and higher supply

voltage are combined and the SLIC runs from a compromise

voltage of approximately -53V.

The specifications listed in the following table are for a 4-line

requirement with 5 REN per line

Input Voltage

Output Power

Efficiency

Output Voltages

-24V Requirements (4 lines)

-72V Requirements (4 lines)

TABLE 1. TYPICAL POWER SUPPLY REQUIREMENT FOR

January 30, 2009

All other trademarks mentioned are the property of their respective owners.

PARAMETER

Intersil (and design) is a registered trademark of Intersil Americas Inc.

VoIP RESIDENTIAL GATEWAY

Author: Manisha Pandya, Jason Houston

Evaluation Board

5V or 12V

3W to 10W

80% to 90%

Regulation: ±5% Maximum

Output Current: 0.10A Ripple:

Less than 0.25V

Regulation: ±10% Maximum

Output Current: 0.10A Ripple:

Less than 1V

-24V, -72 to -100V and/or -48V

REQUIREMENT

P-P

AN1082.2

P-P

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ISL6401EVAL1 Summary of contents

Page 1

... CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. | 1-888-INTERSIL or 1-888-468-3774 Intersil (and design registered trademark of Intersil Americas Inc. Copyright © Intersil Americas Inc. 2003, 2005, 2009. All Rights Reserved All other trademarks mentioned are the property of their respective owners. ...

Page 2

... Precision digital multimeters • A 4-channel scope with probes Power and Load Connections The ISL6401EVAL1Z evaluation board has three sets of terminal posts and a jumper that are used to supply the input voltages and to monitor and load the outputs. Jumper Settings - Jumper JP1 allows the ISL6401 to be biased from a separate 5V supply or from the input voltage at VIN using a zener diode ...

Page 3

... VOUT2 20V/DIV FIGURE 6. OUTPUT SHUTDOWN WAVEFORMS Conclusion The ISL6401EVAL1Z evaluation board is a flyback reference design optimized to provide a high performance, low-cost solution for RSLIC Ring and Talk power supplies in VoIP application. It has the capability of evaluating device operation with loads that simulate one, two, three, or four line operation. ...

Page 4

... ISL6401EVAL1Z Schematic P1 VIN C1A-G P2 2.2µF GND JP1 P3 VCC +5V P4 GND R2 10k SHUTDOWN P5 P6 SYNC C5 560pF SYNC PV 180pF 3 CT GATE COMP PGND 0.027µF 30k 5 FB GND 6 NFB OUT R7 7 NFB IN NC 499 R6 ISL6401 1.24k TP1 1000pF NFB TP2 NULL R1 340 ...

Page 5

... ISL6401EVAL1Z Bill of Materials REFERENCE QTY DESIGNATOR 1 PWB-PCB, ISL6401EVAL1Z, REVA, SOIC, ROHS 1 C9A CAP, RADIAL, 10µF,100V, 20 ROHS 1 C9B CAP, RADIAL, 39µF, 100V, 20%, AL ELEC, ROHS 1 C10A CAP, RADIAL, 10x16, 270µF, 35V, 20%, AL.EL., ROHS 1 C8 CAP, SMD, 0805, 1000pF, 50V, 5%, NPO, ROHS ...

Page 6

... ISL6401EVAL1Z Bill of Materials REFERENCE QTY DESIGNATOR 1 T1 TRANSFORMER-FLYBACK, 6.0µH, 10%, SMD, 8P, 25x17, ROHS 4 Four corners. SCREW, 4-40x1/2in, PAN, NYLON, PHILLIPS, ROHS 4 Four corners. STANDOFF, 4-40x3/4in, F/F, HEX, NYLON 1 Place assy in bag BAG, STATIC, 5x8, ZIP LOC 0 C10B DO NOT POPULATE OR PURCHASE 0 R9 ...

Page 7

... Layout ISL6401EVAL1Z (Continued) 7 Application Note 1082 FIGURE 8. TOP LAYER 1 FIGURE 9. TOP LAYER 2 AN1082.2 January 30, 2009 ...

Page 8

... Layout ISL6401EVAL1Z (Continued) Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that the Application Note or Technical Brief is current before proceeding. For information regarding Intersil Corporation and its products, see www.intersil.com ...

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