PDF AN1324 Data sheet ( Hoja de datos )

Número de pieza	AN1324
Descripción	Quadruple Operational Amplifiers
Fabricantes	Panasonic Semiconductor
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No Preview Available ! Using the ISL6401 RSLIC PWM Controller ® Evaluation Board Application Note October 2003 AN1082 Author: Manisha Pandya, Jason Houston 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 over-current 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, Intersil Corporation, File No. FN9007, available on Intersil’s website, http://www.intersil.com/ 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 have created the need to control and manage the functions of the phone locally as opposed to the central office. In both instances the 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 -70 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 20-25mA 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 below are for a 4-line requirement with 5 REN per line TABLE 1. TYPICAL POWER SUPPLY REQUIREMENT FOR VoIP RESIDENTIAL GATEWAY PARAMETER REQUIREMENT Input Voltage 5 or 12 volts Output Power 3 to 10 watts Efficiency 80 to 90% Output Voltages -24V, -72 to -100V and/or -48V -24V Requirements (4 lines) Regulation: ±5% Maximum Output Current: 0.10A Ripple: Less than 0.25Vpp -72V Requirements (4 lines) Regulation: ±10% Maximum Output Current: 0.10A Ripple: Less than 1Vpp 1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 321-724-7143 \| Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright © Intersil Americas Inc. 2003. All Rights Reserved All other trademarks mentioned are the property of their respective owners. 1 page Application Note 1082 ISL6401EVAL1E Bill of Materials ITEM REFERENCE QTY PART NUMBER PART TYPE 1 U1 1 ISL6401CB IC, Linear 2 Q1 1 IRLR2905 MOSFET Single 3 D1 1 BZT52C5V1 Diode 4 D2 1 MURS120T3 Diode 5 D3 1 MURS160T3 Diode 6 T1 1 IFLY0012 Transformer 7 C1A to C1G, 9 GMK325BJ225KN-T Capacitor, Ceramic C11, C13 DESCRIPTION PACKAGE VENDOR Current mode PWM Controller SO-14 Intersil N-channel, 55V, 0.027Ω, 42A TO-252AA International Zener, 5.1V, ±5%, 0.5A SOD123 Diode Schottky, 200V, 1A Case 403A-03 Motorola/ON Semi Schottky, 600V, 1A Case 403A-03 Motorola/ON Semi Custom Built IFLY0012 GCI/Falco 2.2µF, 20%, 35V, X7R SM_1210 Taiyo Yuden 8 C2 9 C3 10 C4 11 C5 12 C6 13 C7 14 C8 15 C9A 16 C9B 17 C10A 18 C10B (Do Not Populate) 1 0805YC221KAT2A Capacitor, Ceramic, NPO 220pF, 10%, 50V 1 1812C105MAT2A Capacitor, Ceramic, X7R 1µF, 20%, 50V 1 1206YC331KAT2A Capacitor, Ceramic, NPO 330pF, 20%, 100V 1 08055A561FAT2A Capacitor, Ceramic, NPO 560pF, ±1 50V 1 0805YC181KAT2A Capacitor, Ceramic, NPO 180pF, 10%, 50V 1 0805YC273KAT2A Capacitor, Ceramic, X7R 0.027µF, 10%, 50V 1 0805YC102KAT2A Capacitor, Ceramic, X7R 1000pF, 5%, 50V 1 100MV100AX Capacitor, Aluminum 100µF, 20%,100V 1 100MV39AX Capacitor, Aluminum 39µF, 20%,100V 1 35MV270AX Capacitor, Aluminum 270µF, 20%,35V 1 Capacitor, Aluminum SM_0805 AVX/Panasonic SM_1812 SM_1206 AVX AVX/Panasonic SM_0805 AVX/Panasonic SM_0805 AVX/Panasonic SM_0805 AVX/Panasonic SM_0805 AVX/Panasonic TANT-200-500 SAYNO CASE-CC SAYNO CASE-CC SAYNO CASE-CC SAYNO 19 C12, C14 20 C15 21 R1 22 R2 23 R3 24 R4 25 R5 26 R6 27 R7 28 R8 29 R9 (Do Not Populate) 30 R10 31 R11 32 R12 2 1812C104MAT2A Capacitor, Ceramic, X7R 0.1µF, 20%, 100V 1 0805YC103KAT2A Capacitor, Ceramic, X7R 0.01µF, 5%, 50V 1 Resistor, Film 340Ω, 5%, 1/2W 1 Resistor, Film 10kΩ, 1%, 0.1W 2 Resistor, Film 100Ω, 5%, 0.1W 1 Resistor, Power metal 0.025Ω, 1%, 1W strip 1 Resistor, Film 100Ω, 5%, 0.25W 1 Resistor, Film 1.24kΩ, 1%, 0.1W 1 Resistor, Film 499Ω 1 Resistor, Film 30KΩ, 1%, 0.1W 1 Resistor, Film 2.43kΩ, 1%, 1/8W 1 Resistor, Film 220Ω, 1%, 0.25W 1 Resistor, Film 47.5kΩ, 1%, 0.1W 1 Resistor, Film 143kΩ, 1%, 0.1W SM_1812 SM_0805 SM_2010 SM_0805 SM_0805 SM_2512 AVX/Panasonic AVX/Panasonic Panasonic Panasonic Panasonic Vishay / IRC SM_1210 SM_0805 SM_0805 SM_0805 SM_01206 Panasonic Panasonic Panasonic Panasonic Panasonic SM_1210 SM_0805 SM_0805 Panasonic Panasonic Panasonic 5 5 Page

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