(Ta=Topr unless otherwise specified)

Electro-optical Characteristics (2)

PC928

MIN.

TYP.

MAX.

Test circuit

Overcurrent detecting voltage

*10

6.5

6.0

5.5

V

(9)

Overcurrent detecting voltage

hysteresis width

123

V

FS = OPEN

-4

10

µ s

(13)

25

-

µ s

--

2

V

(10)

Low level error

signal voltage

C = OPEN

-

0.2

0.4

V

(11)

High level error

signal current

-

-

100

µ A

(12)

Ω

-1

5

µ s

(14)

Error signal output pulse width

20

35

-

µ s

*9

*9

*9

Ω

Ω

Ω

Ω

Ω

Precautions for Operation

Parameter

Symbol

Conditions

Unit

→Low" delay time

at protection from overcurrent

from overcurrent

from overcurrent

*10 V

represents C-terminal voltage when O output goes from "High" to "Low".

CTH

2

*9 When measuring overcurrent, protective output and error signal output characteristics, connect a bypass capacitor (0.01

µ F or more) between V

and GND

CC

1. It is recommended that a capacitor of about 1000pF is added between C-terminal and GND in order to prevent

malfunction of C-terminal due to noise. In the case of capacitor added, rise of the detecting voltage is delayed.

Thus, use together a resistance of about 1k

Ω set between Vcc and C-terminal.

The C-terminal rise time varies with the time constant of CR added. Make it clear before use.

2. The light-detecting element used for this product is provided with a parasitic diode between each terminal and GND.

When a terminal happens to reach electric potential lower than GND potential even in a moment, malfunction

or rupture may result. Design the circuit so that each terminal will be kept at electric potential lower than the

GND potential at all times.

Error signal "High

→Low"

delay time

s

13

14 near the device.