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APW7083QBI-TRG Datasheet(PDF) 11 Page - Anpec Electronics Coropration

Part # APW7083QBI-TRG
Description  5A, 26V, 380kHz, Synchronous Step-Down Converter
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Manufacturer  ANPEC [Anpec Electronics Coropration]
Direct Link  http://www.anpec.com.tw
Logo ANPEC - Anpec Electronics Coropration

APW7083QBI-TRG Datasheet(HTML) 11 Page - Anpec Electronics Coropration

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Copyright
© ANPEC Electronics Corp.
Rev. A.5 - Sep., 2011
APW7083
www.anpec.com.tw
11
Pin Description
PIN
NO.
NAME
FUNCTION
1
FB
Feedback Input. The IC senses feedback voltage via FB and regulate the voltage at 0.8V.
Connecting FB with a resistor-divider from the output set the output voltage in the range from
0.8V to 90% VIN.
2
COMP
Output of error amplifier. Connect a series RC network from COMP to GND to compensate the
regulation control loop. In some cases, an additional capacitor from COMP to GND is required
for noise decoupling.
3
ZCS
Zero-Crossing Sense pin. Please externally connect this pin with LX.
4~7, 22
PGND
POWER Ground pins. All these pins must be connected externally to the power ground plane.
8~20
LX
Power Switching Output. Connect this pin to the underside Exposed Pad.
21, 23, 24
VIN
Power Input. VIN supplies the power (4.5V to 26V) to the control circuitry, gate driver and
step-down converter switch. Connecting a ceramic bypass capacitor and a suitably large
capacitor between VIN and GND eliminates switching noise and voltage ripple on the input to
the IC.
25
EN
Enable Input. EN is a digital input that turns the regulator on or off. Drive EN high to turn on the
regulator, drive it low to turn it off. Pull up with 100k
Ω resistor for automatic start-up.
26
UGND
Gate driver power ground of the P-channel Power MOSFET. A linear regulator regulates a 5.5V
voltage between VIN and UGND to supply power to P-channel MOSFET gate driver. Connect
a ceramic capacitor (1
µF typ.) between VIN and UGND for noise decoupling and stability of the
linear regulator.
27
VCC
Bias input and 4.2V linear regulator’s output. This pin supplies the bias to some control circuits.
The 4.2V linear regulator converts the voltage on VIN to 4.2V to supply the bias when no
external 5V power supply is connected with VCC. Connect a ceramic capacitor (1
µF typ.)
between VCC and GND for noise decoupling and stability of the linear regulator.
28
GND
Signal Ground.
Block Diagram
LX
V
REF
0.8V
Soft-Start
and
Fault Logic
Error
Amplifier
FB
Inhibit
70%V
REF
UVP
PGND
POR
Soft-Start
4.2V Regulator
and
Power-On-Reset
V
CC
VCC
V
CC
Enable
Current Sense
Amplifier
EN
COMP
OVP
118%V
REF
Oscillator
380kHz
Slope
Compensation
Current
Compartor
0.8V
UGND
VIN
Over-
Temperature
Protection
Zero-Crossing
Comparator
Current-
Limit
V
IN
FB
2.5V
ENOK
UG
LG
Gate
Driver
Gate
Driver
Gm
Gate
Control
Linear
Regulator
ZCS
GND


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