1-341

limiting resistor R

necessary in order to prevent

damage to the output transistors

Q1 and Q2. (See Note 7.) A

bypass capacitor C

mended to reduce power supply

noise.

Recommended Protection

for Output Transistors

During switching transitions, the

output transistors Q1 and Q2 of

the HCPL-3100/3101 can conduct

large amounts of current. Figure

1 describes a recommended

circuit design showing a current

Recommended Operating Conditions

Parameter

Symbol

Device

Min.

Max.

Units

Power Supply Voltage

15

30*

V

15

24

V

Input Current (ON)

I

F(ON)

HCPL-3100

12**

24

mA

HCPL-3101

8**

16

mA

Input Current (OFF)

I

F(OFF)

HCPL-3100

-

0.6

mA

HCPL-3101

-

0.2

mA

Operating Temperature

-25

80

°C

**The initial switching threshold is 10 mA or less for the HCPL-3100 and 5 mA or less for the HCPL-3101.

Figure 1. Recommended Output Transistor Protection and Typical Application Circuit.

8

7

6

5

Q2

Q1

+5 V

R

TTL

OR

LSTTL

ANODE

CATHODE

3

12V

12V

+ HVDC

3-PHASE

AC

- HVDC

IGBT

(OR

MOSFET)

HCPL-3100/1

TOTEM

POLE

OUTPUT

GATE

CONTROL

INPUT

R = 25 - 100

Ω

R = 180

Ω (HCPL-3100)

240

Ω (HCPL-3101)

BYPASS CAPACITOR C = 0.1

µF

2

3

1