CS1107 datasheet(3/4 Pages) CHERRY

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VBAT

VCC

Output

Gnd

VCC

Control

Gnd

CS1107

Gnd

Fault

microprocessor

20k

10nF

CMODULE(ESD)

Applications Diagram

Circuit Description

The CS1107 relay driver IC provides up to 350mA of drive

current in a low-side configuration. The Output driver pin

is controlled through the TTL compatible Control input

pin. A high condition on the Control pin turns the output

pin on.

The

pin reports short circuit, open circuit, and

overtemperature conditions on the IC. If a fault is present,

the open collector output

pin will be low. Typical

numbers for faults are: exceeding 500mA of drive current

will report a short circuit. Less than 40mA (typical) will

report an open circuit. A temperature fault will be reported

when the die temperature exceeds 180¡C (typical). Faults

are only reported when the Control pin is high, due to the

low quiescent current when the Control pin is low and the

output device is turned off.

Overcurrent protection is provided by duty cycle control.

When the Output current exceeds the current limit thresh-

old, the output enters duty cycle mode to reduce power

dissipation of the IC to a safe level. The higher the thresh-

old is exceeded the lower the duty cycle becomes.

A 33V on-chip zener diode on the Output pin protects the

device from flyback pulses when a relay is turned off. The

saturation voltage of this pin will not exceed 1.5V at

350mA.

Fault

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