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
SYNCHRONIZATION SIGNALS
BRC: The BRC output controls the ring generator’s output power
bridge. The bridge converts the half sine rectified wave to a full sine
wave at the output.
The BRC signal is a logic level square wave at the same frequency
of the output sine wave.
SYNC: The SYNC output is used to synchronize output ringing
relays switching with the ring generator’s output voltage zero
crossing.
The SYNC output produces a high logic level pulse to
indicate zero crossing. The SYNC pulse rises a short time prior to
the output signal’s zero crossing in order to allow for the relay
response time. Exact signal timing are indicated in the ELECTRICAL
CHARACTERISTICS SYNC OUTPUT parameters.
V
BAT = -48v
to SLIC Audio Line
Relay
TIP
RING
PD5019
Based Ring
Generator
Control
SYNC
O1
O2
Zero crossing relay control utilizing the SYNC output
LOAD REGULATION
Load regulation refers to the degree of output voltage deviations as a
function of output rms current variations. The load regulation
capability of a ring generator built around the PD5019 will be effected
by a number of design and component selection criteria:
♦
The quality of the transformers’ primary to secondary coupling
and winding leakage. Good coupling and low leakage will
improve load regulation.
♦
Impedance of the transformer winding and core losses. Low
impedance and low core losses will improve load regulation.
♦
Input capacitor ESR. Low ESR will reduce input voltage ripple,
which will improve the input voltage A/D sampling accuracy.
Since the input voltage A/D sensing directly effects the device’s
output voltage, high sampling accuracy will improve load
regulation.
♦
FET dropout voltage. Low main switching and synchronous
switching FETs dropout voltage will improve load regulation.
♦
Output bridge transistor’s dropout voltage. Low dropout voltage
will improve load regulation.
In proper design, load regulation of 6% for loads varying from 10% to
100%, and 10% regulation for loads varying from no load to 100% of
the circuit’s rated load, can be achieved. Rated load is defined as the
equivalent loading that does not cause the PD5019 to decrease the
ring generator’s output voltage, or trigger the overload/short circuit
protection.
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