CPC1563GS datasheet(5/8 Pages) IXYS

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INTEGRATED CIRCUITS DIVISION

CPC1563

www.ixysic.com

R01

Functional Description

The CPC1563 is an optically coupled Solid State

Relay composed of an input LED, two output

MOSFET switches, and a photovoltaic array with

operational management circuitry that integrates

switch control, an active current limit with excess

power regulation, and thermal supervision circuitry. It

was designed specifically for telecom products and

applications requiring switching of moderate level DC

loads or AC loads having a moderate DC offset.

Biasing the input LED to activate the output

switches, while providing for proper performance

over the operating temperature range and during

load faults, is dependent on adherence to the limits

given for the Input Control Current parameter in

the Recommended Operating Conditions table.

Configuring the input drive circuit to provide a

nominal LED current approximately equal to the

typical value listed in the table will provide best

overall performance.

The CPC1563 has two different operating

configurations: (1) unidirectional “DC Only”, and

(2) bidirectional “AC/DC”. When configured for

unidirectional DC-only operation, the device is limited

to switching load voltages having a known fixed

polarity, but, when configured for AC/DC operation,

the CPC1563 is capable of polarity independent

voltage switching. The advantage of operating the

device in the DC-only configuration is the ability to

switch larger load currents while the advantage of

operating in the AC/DC configuration is the flexibility

of switching AC load voltages or DC load voltages of

either polarity.

Fault tolerance management at the CPC1563 load

terminals is accomplished using a combination

of current limiting, switch power regulation, and

thermal supervision. These features autonomously

provide protection during fault conditions, then

disengage once the fault clears allowing the device

to automatically resume normal operation without

external intervention.

Faults originate from a number of causes ranging

from equipment malfunctions such as load

integrity failure or load voltage supply failure to

environmentally initiated events such as power line

contact with outside cabling or ground bounce due to

a nearby lightning strike. Generally when a potentially

damaging fault condition occurs, it presents itself as

an elevated voltage resulting in excess load current

through the switch. Therefore, in this situation, the

first line of defense is to limit the increasing load

current.

Active current limiting circuitry within the CPC1563

provides protection for itself, the printed circuit board

(PCB) traces, and the load by restricting the surge

current to a tolerable level. Limiting the fault load

current regulates the maximum power across all of

the load components external to the CPC1563. The

consequence of limiting the power dissipation in the

external load components is that the power load is

shifted to the CPC1563. This is easily observed by

monitoring the increasing voltage across the load

terminals while in current limit.

Under these conditions the maximum power

dissipation rating of the CPC1563 can be exceeded.

To prevent this, the device must regulate the

power dissipation of the output switches. This is

accomplished by a significant reduction of the load

current anytime the current limit function is active

and the voltage across the load terminals exceeds

the internally set Over-Voltage Threshold (V

TH). The

load current is then reduced to less than 100

A,

and held at this level until the voltage across the

load terminals decreases to less than V

TH at which

point the outputs will resume normal operation.

Should the fault condition persist, current limiting will

begin again, and the process will repeat. Continually

cycling into current limit and over-voltage load current

throttling (I

L<100A) with a long duration fault can

result in excessive temperature rise within the device,

driving it into thermal supervision.

Releasing the input control to deactivate the relay

during current limiting or over-voltage load current

throttling will reset these functions causing the relay

to resume normal operation when the input control is

re-asserted.

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