93334-S08-R datasheet(3/5 Pages) UTC

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93334

LINEAR INTEGRATED CIRCUIT

UNISONICTECHNOLOGIESCO.,LTD

3 of 5

www.unisonic.com.tw

QW-R121-006,A

BLOCK DIAGRAM AND TYPICAL APPLICATION

Figure 1

* Optional parts for extended transient protection

** A350V zener clamp is required when using the standard BU941

This clamp is not required if a selected version with VCEO(SUS) = 550V is used

Dwell

Reference

Buffer

Input

Comparator

Power

Output

&OVP

Ignition

Coil

Primary

8.0mH

Power Ground

with

Hysteresis

CFilter

0.2

RBAT

300

RDRIVE

100

RGAIN

5.0k

**BU941

Current

Limit

Sense

RD2

100

RD1

35-350

0.075

CDWELL

0.1

C2*

0.01

C1*

470

12k

20k

UTC 93334

Reluctor

Pickup

1.35H

Component Values

Pickup

Series resistance = 800Ω±10% @ 25℃, inductance= 1.35H @ 1.0kHz @ 15Vrms

Coil

Leakage L=0.6mH, primary R=0.43Ω±5% @ 25℃, primary L=7.5mH ~ 8.5mH @ 5.0A

Load resistor for pickup=10Ω±20%

RA, RB

Input buffer resistors provide additional transient protection to the already clamped

inputs=20k±20%

C1, C2

For reduction of high frequency noise and spark transients induced in pick-up and leads;

optional and non-critical

RBAT

Provides load dump protection (but small enough to allow operation at VBAT =4.0V) =300Ω±20%

CFilter

Transient filter on VCC, non-critical

CDWELL

Stores reference, circuit designed for 0.1µF±20%

RGAIN

RGAIN/RD1 sets the DC gain of the current regulator =5.0k±20%

RD2

RD2/RD1 set up voltage feedback from RS

Sense resistor (PDAG in thick film techniques) =0.075Ω±30%

RDRIVE

Low enough to supply drive to the output Darlington, high enough to keep VCE(SAT) of the IC

below Darlington turn-on during load dump = 100Ω±20%, 5.0W

RD1

Starting with 35Ω assures less than 5.5A, increasing as required to set 5.5A

RD1=(IO(PEAK) RS – VREF)/((VREF/RD2)-(1.4/RGAIN))-(≈100Ω)

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