PD5036
TELEPHONE RING GENERATOR CONTROLLER
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
♦ Off-Hook / Overload Detection
♦ 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 PD5036
for 2W Ring Generator Applications
INHIBIT
1
FS
2
F1
3
F0
4
OHD
5
XTAL1
6
16
Vcc
15
PWM_Out
14
I.C.
13
CL
12
CAD_In
11
PAD_Out
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 Short/Long Loop Applications
♦ Ring Generator for Telecom Test Equipment
XTAL2
7
10
GND
8
9
SOW-16 Package
BRC
SYNC
GENERAL DESCRIPTION
The PD5036 is a unique pul se w idth m odulator c ontroller, des igned pri marily f or a vari ety of hi gh vol tage s inusoidal t elephone ring generat or
applications. The PD5036 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 PD5036, is an i solated, open l oop flyback t opology. The P D5036 generates a P WM s ignal, which
drives a FE T t ransistor t hat s witches t he primary of a f lyback t ransformer. Thi s produces a rec tified half s ine wave on the secondary side of t he
transformer. An additional control signal synchronizes a 4-out put 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 PD5036 is a c ost-effective solution for applications using more than 10,000 units. For quant ities less than 10,000 units, the most economical
solution is a modular sine wave ring generator (PCR-SIN01A Series, PCR-SIN03B Series, or the PCR-SIN06 Series).
INTERNAL BLOCK DIAGRAM
PD5036
CL
OHD
Vcc
Over-Current
Sensing
Mechanism
Overload
Protection
GND
CAD_In
PAD_Out
Vin
Sense
A/D
Transfer Function
PWM
Unit
PWM_Out
PWM_Out
XTAL1
XTAL2
FS
INHIBIT
F0
F1
BRC
SYNC
Clock
Circuitry
Reset
Clock
Sine
Generator
PowerDsine Ltd. Tel: +972-3-934-7663 • Fax: +972-3-934-7669 • Email: sales@powerdsine.com
PowerDsine Inc. Tel: +516-756-4680 • Fax: +516-756-4691• Email: pwrdsine@erols.com