L6918 데이터 시트보기 (PDF) - STMicroelectronics
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L6918 Datasheet PDF : 35 Pages
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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
(50µA 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:
IOCPx = 3----5R----µ-s--A-e---n--⋅-s--R-e----g-
Where 35µA 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.
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