APW7067N
Function Pin Descriptions
VCC12
- downed immediately.
Power supply input pin. Connect a nominal 12V power UGATE
supplyto this pin. The power-on reset function monitors
This pin is the gate driver for the upper MOSFET of
the input voltage at this pin. It is recommended that a
decoupling capacitor (1 to 10mF) be connected toGND
for noise decoupling.
PWM output.
LGATE
This pin is the gate driver for the lower MOSFET of
PWM output.
BOOT
This pin provides the bootstrap voltage to the upper
gate driver for driving the N-channel MOSFET. An
external capacitor from PHASE to BOOT, an internal
diode, and the power supplyvaltage VCC12, generates
thebootstrap voltagefor theupper gatediver (UGATE).
DRIVE
This pin drives the gate of an external N-channel
MOSFET for linear regulator. It is also used to set the
compensation for some specific applications, for
example, with low values of output capacitance and
ESR.
PHASE
This pin is the return path for the upper gate driver.
Connect this pin to the upper MOSFET source, and
connect a capacitor to BOOT for the bootstrap voltage.
This pin is also used to monitor the voltage drop across
the lower MOSFET for over-current protection.
FBL
This pin is the inverting input of the linear regulator
error amplifier. It is used to set the output voltage.
This pin is also monitored for under-voltage protection,
when theFBL voltage is under 50% of reference voltage
(0.4V), both outputs will be shutdown immediately.
GND
This pin is the signal ground pin. Connect theGNDpin
to a good ground plane.
FS_DIS
This pin be allowed to adjust the switching frequency.
Connect a resistor from FS_DIS pin to the ground to
increase the switching frequency. This pin also provides
shutdown function, use an open drain logic signal to
pull this pin low to disable both outputs, leave open to
enable both outputs.
PGND
This pin is the power ground pin for the lower gate
driver. It should be tied to GND pin on the board.
COMP
This pin is the output of PWM error amplifier. It is
used to set the compensation components.
FB
ThispinistheinvertinginputofthePWMerror amplifier.
It is used to set the output voltage and the compensation
components. This pin is also monitored for under-
voltage protection, when the FB voltage is under 50%
of reference voltage (0.4V), both outputs will be shut
Copyright ã ANPEC Electronics Corp.
7
www.anpec.com.tw
Rev. A.1 - Jun., 2006
ANPEC [ ANPEC ELECTRONICS COROPRATION ]
