PD5019
TELEPHONE RING GENERATOR CONTROLLER
PowerDsine Ltd.
Tel: +972-9-775-5100
• Fax: +972-9-775-5111 • Email: sales@powerdsine.com
PowerDsine, Inc.
Tel: +1-631-756-4680
• Fax: +1-631-756-4691 • Email: sales@powerdsineusa.com
PowerDsine Europe
Tel: +49-6187-900-849
• Fax: +49-6187-292848 • Email: europe@powerdsine.com
FEATURES
♦ Integrated Overload and Short Circuit Protection
♦ Programmable Large Swing Output Amplitude
♦ Digitally Selectable Ringing Frequencies; 16.7/20/25 or 50Hz
♦ Line Regulated Output Amplitude, 45-93Vrms
♦ Overload Protection with Adaptive Output Amplitude
♦ High Output Load Indication Signal
♦ Zero Crossing Synchronization Output
♦ Operates from a Single 5V Supply
♦ Open Loop Flyback Topology Reduces Component Count
♦ Total Bill of Material Cost as Low as $5 Including the PD5019
for 2W Ring Generator Applications
♦ 90 Days Warranty
APPLICATIONS
♦ 1 to 3 Watt Low Cost Sine Wave Ring Generators
♦ 3 to 6 Watt advanced Sine Wave Ring Generators
♦ Large Variety of Customized Sine Wave Ring Generators
♦ Ring Generator for PBX, PABX, DCL, CTI and Key Systems
♦ Ring Generator for Rural Telephony and Wireless Local Loop Systems
♦ Ring Generator for Integrated Access Devices
♦ Ring Generator for VoIP Gateways
♦ Ring Generator for Short/Long Loop Applications
♦ Ring Generator for Telecom Test Equipment
GENERAL DESCRIPTION
The PD5019 is a unique pulse width modulator controller, designed primarily for a variety of high voltage sinusoidal telephone ring generator
applications. The PD5019 is suitable for applications requiring up to 6 Watt and provides all necessary controls for implementing advanced
overload protection, zero crossing relay switching synchronization, Off-Hook detection, multiple ringing frequency selection and output
amplitude adjustment.
The power train, designed to be used with the PD5019, is an isolated, open loop flyback topology. The PD5019 generates a PWM signal,
which drives a FET transistor that switches the primary of a flyback transformer. This produces a rectified half sine wave on the secondary
side of the transformer. An additional control signal synchronizes a 4-output transistor bridge, which converts the rectified half sine wave to full
sine wave. In order to maintain the ring generator’s input to output isolation, the synchronization signals control the bridge via an opto coupler
pair. The controller also includes overload protection, A/D function for measuring the input voltage, and a report signal for indicating over
current.
The PD5019 is a cost-effective solution for applications using more than 10,000 units. For quantities less than 10,000 units, the most
economical solution is a modular sine wave ring generator (PCR-SIN01A Series or the PCR-SIN06 Series).
INTERNAL BLOCK DIAGRAM
Transfer Function
PWM
Unit
CAD_In
PAD_Out
Sine
Generator
Clock
Vcc
GND
XTAL1
XTAL2
INHIBIT
SYNC
Overload
Protection
OHD
F0
F1
BRC
CL
FS
Reset
Clock
Circuitry
PD5019
PWM_Out
Vin
Sense
A/D
Over-Current
Sensing
Mechanism
9
10
16
15
14
13
12
11
1
8
7
6
5
4
3
2
Vcc
SYNC
BRC
PAD_Out
CL
CAD_In
WDO
PWM_Out
INHIBIT
GND
XTAL2
XTAL1
F0
OHD
F1
FS
SOW-16 Package
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