L6280 datasheet(3/26 Pages) STMICROELECTRONICS

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PINS

NAME

FUNCTIONS

1VS

Power Supply Voltage Input

HSD 1

High Side CH 3 Power Output

SMPS OUT

Output of Switchmode Power Supply

HSD 1

High Side CH 1 Power Output

HSD 2

High Side CH 1 Power Output

6, 7,17,29,

39, 40

GND

Common Grounded Terminal

LSD 1A

Low Side CH 1 Power Output

LSD 2A

Low Side CH 1 Power Output

SENSE 1

A Resistor Rsense, connected to this pin allows load current control for CH 1

LSD 1B

Low Side CH 1 Power Output

LSD 2B

Low Side CH 1 Power Output

VS +VDHS

Input Voltage for the HSD Gates Drive

VSS

Logic Supply Voltage Input

Comp.

An RC series network allows the compensation of the SMPS regulation loop

RES OUT

The reset open drain output can be used to warn the microprocessor about VS

and VSS status

ROSC

Together with COSC, sets the cycle time of the SMPS t = 1.1 ROCO

COSC

Together with COSC, sets the cycle time of the SMPS t = 1.1 ROCO and sets the

minimum ON time in the PWM current control loop

The value of this capacitor sets the reset delay tD =7 x 10

4 CD

VDLS

By-pass Capacitor of the LSD Gates Voltage drive

tWD

The value of this CWD sets the duration of the watchdog monostable tWD =3 x 10

4 CWD.

If no watchdog signal is generated into the TWD time the device is automatically

switched off.

Enable Input (active when low)

Write Input. When WR is low the data is loaded into the

µP interface

Operation Selection (see programming sequence).

Channel Selection (see programming sequence).

Data (see programming sequence).

LSD 2B

Low Side CH 2 Power Output

LSD 1B

Low Side CH 2 Power Output

SENSE 2

A Resistor Rsense, connected to this pin allows load current control for CH 2

LSD 2A

Low Side CH 2 Power Output

LSD 1A

Low Side CH 2 Power Output

HSD 2

High Side CH 2 Power Output

HSD 1

High Side CH 2 Power Output

SENSE 3

A Resistor Rsense, connected to this pin allows load current control for CH 3

LSD 1

Low Side CH 3 Power Output

PIN DESCRIPTION

L6280

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