APW7055 Просмотр технического описания (PDF) - Anpec Electronics
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APW7055 Datasheet PDF : 11 Pages
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APW7055
Functional Pin Description (Cont.)
VSEN (Pin 9)
This pin is connected to the standard buck converter’s
output voltage to provide the voltage feedback path for
PWM converter. The OVP(Over-Voltage-Protection)
comparator circuit use this signal to monitor output
voltage status for over-voltage protection.
OCSET (Pin 10)
Connect a resistor (ROCSET ) from this pin to the drain of
the standard buck PWM converter’s MOSFET. ROCSET,
an internal 200mA current source (IOCSET ), and the
MOSFET’s on-resistance(r ) set the converter’s
DS(ON)
over-current (OC) trip point according to the following
equation:
IPEAK =
IOCSET x ROCSET
rDS(ON)
An over-current trip cycles the soft-start function
.
MEM0-1 (Pin 11-12)
MEM0-1 are TTL-compatible logic level input pins of
the 2-bits DAC.The status of these 2 pins set the in-
ternal reference voltage(VDAC) for the standard buck
converter and also sets the OVP threshold voltage.Table
1 shows the DAC table voltage.
PGND (Pin 13)
This is the power ground connection.Tie this pin to
the anode of the flywheel diode of the standard buck
PWM converter’s circuit.
PHASE (Pin 14)
Connect the PHASE pin to the standard buck PWM
converter’s MOSFET source.This pin is used to moni-
tor the voltage drop across the MOSFET for over-cur
rent protection.
UGATE (Pin 15)
Connect this pin to the MOSFET gate of the standard
buck PWM converter.This pin provides the gate drive
for the external MOSFET.
BOOT (Pin 16)
This pin provides bias voltage to the external MOSFET
driver. A bootstrap circuit may be used to pump a
boot voltage for enforcing the driving capability of the
gate driver and improving the performance of the
MOSFET.
Table 1 DAC Table
APW7055 - A
APW7055 - B
Pin Name
MEM1 MEM0
0
0
0
1
1
0
1
1
VMEM
Voltage
2.40
2.45
2.50
2.55
Pin Name
MEM1 MEM0
0
0
0
1
1
0
1
1
VMEM
Voltage
2.60
2.65
2.70
2.75
Copyright ANPEC Electronics Corp. Rev. A.
5
Rev.A.1 - Dec., 2001
www.anpec.com.tw
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