8

Sheet No.: D4-A03901EN

PR33MF51NSZF Series

■ Design Considerations

● Recommended Operating Conditions

Parameter

Symbol

Condition

MIN.

MAX.

Unit

Input

Input signal current at ON state

−

20

25

mA

Input signal current at OFF state

−

0

0.1

mA

Output

Load supply voltage

−−

240

V

Load supply current

Locate snubber circuit between output terminals

(Cs=0.022μF, Rs=47Ω)

−

80%(*)

A

Frequency

f

−

50

60

Hz

Operating temperature

−−20

80

˚C

● Degradation

In phase control applications or where the SSR is being by a pulse signal, please ensure that the pulse width

is a minimum of 1ms.

tion, please incorporate a snubber circuit. Due to the many different types of load that can be driven, we can

merely recommend some circuit values to start with : Cs=0.022μF and Rs=47Ω. The operation of the SSR

and snubber circuit should be tested and if unintentional switching occurs, please adjust the snubber circuit

component values accordingly

When making the transition from On to Off state, a snubber circuit should be used ensure that sudden drops

in current are not accompanied by large instantaneous changes in voltage across the Triac.

This fast change in voltage is brought about by the phase difference between current and voltage.

Primarily, this is experienced in driving loads which are inductive such as motors and solenods.

Following the procedure outlined above should provide sufficient results.

Any snubber or Varistor used for the above mentioned scenarios should be located as close to the main out-

put triac as possible.

All pins shall be used by soldering on the board. (Socket and others shall not be used.)

● Degradation

In general, the emission of the IRED used in SSR will degrade over time.

In the case where long term operation and / or constant extreme temperature fluctuations will be applied to

the devices, please allow for a worst case scenario of 50% degradation over 5years.

Therefore in order to maintain proper operation, a design implementing these SSRs should provide at least

twice the minimum required triggering current from initial operation.