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FUNCTIONAL DESCRIPTIONS
INTRODUCTION
PHASE C LOW-SIDE GATE (PC_LS_G)
This is the gate drive for the phase C low side output FET.
It provides a high current with a low impedance to turn on and
off the low side FET. A low impedance drive ensures
transient currents do not overcome an off-state driver and
allow pulses of current to flow in the external FET. This output
has been designed to resist the influence of negative currents
also.
PHASE B HIGH-SIDE GATE (PB_HS_G)
This is the gate drive for the phase B high side output FET.
This pin provides the gate bias to turn the external FET on or
off. The gate voltage is limited to about 15V above the FET
source voltage. A low impedance drive is used, ensuring
transient currents do not overcome an off-state driver and
allow pulses of current to flow in the external FETs. This
output has been designed to resist the influence of negative
currents also.
PHASE C HIGH-SIDE SOURCE (PC_HS_S)
The source connection for the phase C high side output
FET is the reference voltage for the gate drive on the high
side FET and also the low voltage end of the bootstrap
capacitor.
PHASE C HIGH-SIDE GATE (PC_HS_G)
This is the gate drive for the phase C high side output FET.
This pin provides the gate bias to turn the external FET on or
off. The gate voltage is limited to about 15V above the FET
source voltage. A low impedance drive is used, ensuring
transient currents do not overcome an off-state driver and
allow pulses of current to flow in the external FETs. This
output has been designed to resist the influence of negative
currents also.
PHASE C BOOTSTRAP (PC_BOOT)
This is the bootstrap capacitor connection for phase C. A
capacitor (typically 0.1μF) connected between PC_HS_S
and this pin provides the gate voltage and current to drive the
external FET gate. The voltage across this capacitor is limited
to about 15V.
PHASE B GROUND (PGNDB)
The phase B power ground is the pin used to return the
gate currents from the low side FET. Best performance is
normally realized by connecting this node directly to the
source of the low side FET for phase B.
PHASE B LOW-SIDE GATE (PC_LS_G)
This is the gate drive for the phase B low side output FET.
It provides a high current with a low impedance to turn on and
off the low side FET. A low impedance drive ensures
transient currents do not overcome an off-state driver and
allow pulses of current to flow in the external FET. This output
has been designed to resist the influence of negative currents
also.
PHASE B BOOTSTRAP (PB_BOOT)
This is the bootstrap capacitor connection for phase B. A
capacitor (typically 0.1μF) connected between PB_HS_S and
this pin provides the gate voltage and current to drive the
external FET gate. The voltage across this capacitor is limited
to about 15V.
PHASE A GROUND (PGNDA)
The phase A power ground is the pin used to return the
gate currents from the low side FET. Best performance is
normally realized by connecting this node directly to the
source of the low side FET for phase A.
PHASE A LOW-SIDE GATE (PA_LS_G)
This is the gate drive for the phase A low side output FET.
It provides a high current with a low impedance to turn on and
off the low side FET. A low impedance drive ensures
transient currents do not overcome an off-state driver and
allow pulses of current to flow in the external FET. This output
has been designed to resist the influence of negative currents
also.
PHASE A HIGH-SIDE SOURCE (PA_HS_S)
The source connection for the phase A high side output
FET is the reference voltage for the gate drive on the high
side FET and also the low voltage end of the bootstrap
capacitor.
PHASE A HIGH-SIDE GATE (PA_HS_G)
This is the gate drive for the phase A high side output FET.
This pin provides the gate bias to turn the external FET on or
off. The gate voltage is limited to about 15V above the FET
source voltage. A low impedance drive is used, ensuring
transient currents do not overcome an off-state driver and
allow pulses of current to flow in the external FETs. This
output has been designed to resist the influence of negative
currents also.
PHASE B HIGH-SIDE SOURCE (PB_HS_S)
The source connection for the phase B high side output
FET is the reference voltage for the gate drive on the high
side FET and also the low voltage end of the bootstrap
capacitor.
PHASE A BOOTSTRAP (PA_BOOT)
This is the bootstrap capacitor connection for phase A. A
capacitor (typically 0.1μF) connected between PA_HS_S and
this pin provides the gate voltage and current to drive the
external FET gate. The voltage across this capacitor is limited
to about 15V.
33927
Analog Integrated Circuit Device Data
22
Freescale Semiconductor
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