L6710 datasheet(3/34 Pages) STMICROELECTRONICS

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L6710

PIN FUNCTION

Name

Description

N.C.

Not internally bonded.

N.C.

Not internally bonded.

BOOT1

Channel 1 HS driver supply. This pin supplies the relative high side driver.

Connect through a capacitor (100nF typ.) to the PHASE1 pin and through a diode to VCC

(cathode vs. boot).

N.C.

Not internally bonded.

VCC

Device supply voltage. The operative supply voltage is 12V ±15%.

Filter with 1

µF (Typ.) capacitor vs. GND.

6,7

SGND

All the internal references are referred to this pin. Connect it to the PCB signal ground.

COMP

This pin is connected to the error amplifier output and is used to compensate the control

feedback loop.

This pin is connected to the error amplifier inverting input and is used to compensate the

voltage control feedback loop.

A current proportional to the sum of the current sensed in both channel is sourced from this

pin (50

µA at full load, 70µA at the Constant Current threshold). Connecting a resistor

between this pin and VSEN pin allows programming the droop effect.

10,11

N.C.

Not internally bonded.

REF_OUT

Reference voltage output used for voltage regulation.

The pin is protected against short circuit vs. ground.

Filter to SGND with 47nF ceramic capacitor.

VSEN

Manages Over&Under-voltage conditions and the PGOOD signal. It is internally connected

with the output of the Remote Sense Buffer for Remote Sense of the regulated voltage.

If no Remote Sense is implemented, connect it directly to the regulated voltage in order to

manage OVP, UVP and PGOOD.

Connecting 1nF capacitor max vs. SGND can help in reducing noise injection.

OUTEN

Output Enable pin. Internally 3V pulled-up.

If forced to a voltage lower than 0.4V, the device stops operation with all mosfets and

protections OFF. Setting the pin free, the device re-start operations.

Filter with 1nF capacitor vs. SGND to avoid noise injection.

15, 16

N.C.

Not internally bonded.

FBR

Remote sense buffer non-inverting input. It has to be connected to the positive side of the

load to perform a remote sense.

If no remote sense is implemented, connect directly to the output voltage (in this case

connect also the VSEN pin directly to the output regulated voltage).

FBG

Remote sense buffer inverting input. It has to be connected to the negative side of the load

to perform a remote sense.

Pull-down to ground if no remote sense is implemented.

ISEN1

Channel 1 current sense pin. The output current may be sensed across a sense resistor or

across the low-side mosfet RdsON. This pin has to be connected to the low-side mosfet drain

or to the sense resistor through a resistor Rg.

The net connecting the pin to the sense point must be routed as close as possible to the

PGNDS net in order to couple in common mode any picked-up noise.

PGNDS

Common Power Ground sense pin. The net connecting the pin to the sense point must be

routed as close as possible to the ISENx net in order to couple in common mode any picked-

up noise.

ISEN2

Channel 2 current sense pin. The output current may be sensed across a sense resistor or

across the low-side mosfet RdsON. This pin has to be connected to the low-side mosfet drain

or to the sense resistor through a resistor Rg.

The net connecting the pin to the sense point must be routed as close as possible to the

PGNDS net in order to couple in common mode any picked-up noise.

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