L9610 datasheet(4/12 Pages) STMICROELECTRONICS

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ELECTRICAL CHARACTERISITCS (Tamb =– 40

°Cto 85 °C; 6 V <VS < 16 V unless otherwise specified)

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

Operating Supply Voltage

Quiescent Current

2.5

VSC

Internal Supply Voltage Clamp

IS = 200mA

VSH

Supply Voltage High Threshold

18.5

VSL

Supply Voltage Low Threshold

Reference Voltage

3.3

3.5

3.7

Reference Current

∆VR ≤ 100mV

VINL

Input Low Threshold

0.13

0.15

0.2

VIN/VR

Oscillator Freq. Constant

Note 1

800

2500

nF/s

Gate Voltage Slew Rate

Constant

Note 2

nFV/ms

Protection Time Delay Constant

Note 3

0.12

0.44

ms/nF

VSi

Sense Input Volt.

100

120

VGON

Gate Driving Volt. above VS

VS = 16V

VGOFF

Gate Voltage in OFF Condition

IG = 100

µA

1.2

IIN

Input Current

– 5

– 1

µA

VENL

Low Enable Voltage

0.8

VENH

High Enable Voltage

2.0

IEN

Enable Input Current

µA

Slew Rate

Without CS

0.5

µs

VMONsat

Saturation Voltage (pin 12)

IMON = 2.5 mA

1.5

Notes :

1. fo =KF/CF.

2. dVG/dt = Ks/Cs.

3. tprot =KT CT.

FUNCTIONAL DESCRIPTION

PULSE WIDTH COMPARATOR

A ground compatible comparator generates the

PWM signal which controls the gate of the external

powerMOS.

The slopes of the leading and trailing edges of the

gate driving signal are defined by the external ca-

pacitor CS according to :

dVG/dt = KS/CS

This feature allows to optimize the switching speed

for the power and RFI performance best suited for

the application.

The lower limit of the duty cycle is fixed at 15 % of

the ratio between the input and the reference vol-

tage (see fig. 1). Input voltages lower than this value

disable the internal oscillator signal and therefore

the gate driver.

GROUND COMPATIBLE TRIANGLE

OSCILLATOR

The triangle oscillator provides the switching fre-

quency fo set by the external capacitorCF according

to :

fo =KF/CF

If the pin PWL (power limitation) is connected to

ground and Vs is higher than the PWL threshold

voltage, the duty cycle and the fo frequency are re-

duced : this allows to transfer a costant power to the

load (see fig. 2).

TIMER AND PROTECTION LATCH

When an overcurrent occurs, the device starts

charging the external capacitor CT ; the protection

time is set according to :

tprot =KT . CT

L9610C - L9611C

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