L6918A datasheet(5/35 Pages) STMICROELECTRONICS

No de pièce	L6918A

Description	5 BIT PROGRAMMABLE MULTIPHASE CONTROLLER

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Fabricant	STMICROELECTRONICS [STMicroelectronics]

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L6918 L6918A

L6918 (SLAVE) PIN FUNCTION

N.

Name

Description

1

LGATE1

Channel 1 low side gate driver output.

2

VCCDR

LS Mosfet driver supply. 5V or 12V buses can be used.

3

PHASE1

This pin is connected to the Source of the upper mosfet and provides the return path for the

high side driver of channel 1.

4

UGATE1

Channel 1 high side gate driver output.

5

BOOT1

Channel 1 bootstrap capacitor pin. This pin supplies the high side driver. Connect through a

capacitor to the PHASE1 pin and through a diode to Vcc (cathode vs. boot).

6

VCC

Device supply voltage. The operative supply voltage is 12V.

7

GND

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

8

COMP

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

feedback loop.

9

FB

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 Over Current threshold). Connecting a resistor RFB between this

pin and VSEN pin allows programming the droop effect.

10

VSEN

Connected to the output voltage it is able to manage 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.

11

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).

12

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.

13

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 in order to program the current intervention for each

phase at 140% as follow:

Where 35

µA is the current offset information relative to the Over Current condition (offset at

OC threshold minus offset at zero load).

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

PGNDS1 net in order to couple in common mode any picked-up noise.

14

PGNDS1

Channel 1 Power Ground sense pin. The net connecting the pin to the sense point must be

routed as close as possible to the ISEN1 net in order to couple in common mode any picked-up

noise.

15

PGNDS2

Channel 2 Power Ground sense pin. The net connecting the pin to the sense point must be

routed as close as possible to the ISEN2 net in order to couple in common mode any picked-up

noise.

I

OC Px

35

µAR

g

⋅

R

s ens e

--------------------------

=

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