MOC2R60-10 MOC2R60-15

5

Motorola Optoelectronics Device Data

Figure 13. Delay Time, t(d), and Fall Time, t(f),

versus LED Trigger Current

IFT, LED TRIGGER CURRENT (mA)

100

0.1

10

20

30

40

50

60

10

1

t(d)

t(f)

t(delay), t(f) versus IFT

The POWER OPTO Isolators turn on switching speed con-

sists of a turn on delay time t(d) and a fall time t(f). Figure 13

shows that the delay time depends on the LED trigger cur-

rent, while the actual trigger transition time t(f) stays constant

with about one micro second.

The delay time is important in very short pulsed operation

because it demands a higher trigger current at very short trig-

ger pulses. This dependency is shown in the graph IFT ver-

sus LED PW.

The turn on transition time t(f) combined with the power

triacs turn on time is important to the power dissipation of this

device.

SCOPE

IFT

VTM

t(d)

t(f)

ZERO CROSS

DETECTOR

EXT. SYNC

Vout

FUNCTION

GENERATOR

PHASE CTRL.

PW CTRL.

PERIOD CTRL.

Vo AMPL. CTRL.

IFT

VTM

10 k

Ω

DU

T

100

Ω

ISOL. TRANSF.

A

C

115

VAC

Figure 14. Switching Time Test Circuit

Figure 15. Typical Application Circuit

VCC

Load

MOV

R2

C1

R1

MOC2R60

Select the value of R1 according to the following formulas:

(1)

R1 = (VCC – VF) / Max. IFT (on) per spec.

(2)

R1 = (VCC – VF) / 0.050

Typical values for C1 and R2 are 0.01

µF and 39 Ω,

respectively. You may adjust these values for specific

applications. The maximum recommended value of C1 is

0.022

µF. See application note AN1048 for additional

information on component values.

The MOV may or may not be needed depending upon the

characteristics of the applied AC line voltage. For

applications where line spikes may exceed the 600 volts

rating of the MOC2R60, an MOV is required.