UL497L-S16-R datasheet(2/8 Pages) UTC

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UL497

Preliminary

LINEAR INTEGRATED CIRCUIT

UNISONICTECHNOLOGIESCO.,LTD

2 of 8

www.unisonic.com.tw

QW-R118-015.a

PIN CONFIGURATION

PIN DESCRIPTION (refer to APPLICATION CIRCUIT)

PIN NO.

PIN NAME

DESCRIPTION

GND

This pin must be connected to ground.

SIGNAL GND

This pin must be connected to ground.

POWER SUPPLY

The input of supply voltage. Its voltage will be limited by an 7.5V zener. The

R5 inside will limit the current by the zener for high supply voltege.

N.C.

Connected to ground or left open.

HALL-EFFECT INPUT

The input of the hall-effect pickup signal. This input is dwell control circuit

output to enable the current driving into the coil.

RPM OUTPUT

As a open collector output, it’s at low level when current flows in the ignition

coil. It should be connected pin7 zener for high volteges protection. Then R8

must limit the zener current, too, and R 1 limits pin 6 current if RPM module

pad is accidentally connected to VS.

AUX. ZENER

A 21V Zener whose current must be limited by an internal resistor.

RECOVERY TIME

A capacitor connected between this pin and ground sets the slope of the

dwell time variation as it rises from zero to the correct value. It occurs just

following the detection of I coll≤94% I nom, only before the low transition of the

hall-effect signal pulse. The duration is given :

tsrc=12.9×R7src× Csrc (ms)

PS: R7 (KΩ) is the biasing resistor at pin 12 and Csrc (μF) is the delay

capacitor at pin 8.

MAX CONDUCTION

TIME

Between this pin and ground there’s a capacitor which determines the

intervention delay of the permanent conduction protection. The coil current is

slowly reduced to zero after the delay time.

Delay Time TP is given by :

tP=16×R7 CP (ms)

PS: R7 (KΩ) is the biasing resistor at pin 12 and CP (μF) is the delay capacitor

at pin 9.

DWELL CONTROL

TIMER

Connected between this pin and ground there’s a capacitor CT which is

charged when the Hall effect output is High and is discharged at the High to

Low transition of the Hall effect signal. When using a 62KΩ resistor at pin12

CT should be 100nF.

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