APW7085K Просмотр технического описания (PDF) - Anpec Electronics
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APW7085K Datasheet PDF : 24 Pages
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APW7085
Pin Description
PIN
NAME
FUNCTION
Power Input. VIN supplies the power (4.5V to 26V) to the control circuitry, gate driver and step-down
1
VIN
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.
2
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 100kΩ resistor for automatic startup.
Gate driver power ground of the P-channel Power MOSFET. A linear regulator regulates a 5.5V
3
UGND
voltage between VIN and UGND to supply power to P-channel MOSFET gate driver. Connect a
ceramic capacitor (1µF typ.) between VIN and UGND for noise decoupling and stability of the linear
regulator.
Bias input and 4.2V linear regulator’s output. This pin supplies the bias to some control circuits. The
4
VCC
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 (1µF typ.) between VCC and
GND for noise decoupling and stability of the linear regulator.
5
LX
Power Switching Output. LX is the Drain of the P-channel MOSFET to supply power to the output.
Connect the pin to output LC filter.
Output of error amplifier. Connect a series RC network from COMP to GND to compensate the
6
COMP regulation control loop. In some cases, an additional capacitor from COMP to GND is required for
noise decoupling.
Feedback Input. The IC senses feedback voltage via FB and regulate the voltage at 0.8V.
7
FB
Connecting FB with a resistor-divider from the output set the output voltage in the range from 0.8V
to 90% VIN.
8
GND Power and Signal Ground.
Block Diagram
VIN
VCC
FB
COMP
EN
VCC
4.2V Regulator
and
Power-On-Reset
POR
Current
Limit
70%VREF
UVP
Soft-Start
Soft-Start
and
Fault Logic
VREF
0.8V
Error
Amplifier
2.5V
0.8V
ENOK
Enable
Over-
Temperature
Protection
Current Sense
Amplifier
Inhibit
Gate
Control
Current
Compartor
Slope
Compensation
Oscillator
FB
380kHz
UG
Gate
Driver
Linear
Regulator
VIN
UGND
LX
GND
Copyright © ANPEC Electronics Corp.
11
Rev. A.7 - Sep., 2010
www.anpec.com.tw
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