APW7312 데이터 시트보기 (PDF) - Anpec Electronics
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APW7312 Datasheet PDF : 20 Pages
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APW7312
Pin Description
PIN
NO. NAME
FUNCTION
1
BS
High-Side Gate Drive Boost Input. BS supplies the voltage to drive the high-side N-channel MOSFET. At least
10nF capacitor should be connected from LX to BS to supply the high side switch.
Power Input. VIN supplies the power (4.5V to 24V) to the control circuitry, gate drivers and step-down converter
2
VIN switches. 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.
3
LX
Power Switching Output. LX is the Drain of the N-Channel power MOSFET to supply power to the output LC
filter.
4
GND Ground.
5
FB
Output feedback Input. The APW7312 senses the feedback voltage via FB and regulates the voltage at 0.925V.
Connecting FB with a resistor-divider from the converter’s output sets the output voltage from 0.925V to 20V.
6
COMP
Output of the 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.
7
EN
Enable Input. EN is a digital input that turns the regulator on or off. EN threshold is 2.5V with 0.2V hysteresis.
Pull up with 100kΩ resistor for automatic startup.
Soft-Start Control Input. SS controls the soft-start period. Connect a capacitor from SS to GND to set the
8
SS soft-start period. A 0.1µF capacitor sets the soft-start period to 15ms. To disable the soft-start feature, leave SS
unconnected.
Block Diagram
VIN
2
Over
Temperature
Protection
Power-On-
Reset
LOC
Current
Limit
Current Sense
Amplifier
5V
SS 8
5V
6µA
OTP
POR
120%VREF
OVP
Fault
Logics
Inhibit
Gate
Control
FB 5
COMP 6
EN 7
VREF
Gm
Error
Amplifier
Current
Compartor
2.5/2.3V
1.5V
UVLO
Enable
VIN
Internal
Regulator
Slope
Compensation
Oscillator
5V
340kHz/
110kHz
Gate
Driver
5V
Gate
Driver
LOC
FB
0.6V
Current Sense
Amplifier
1 BS
3 LX
4 GND
Copyright © ANPEC Electronics Corp.
10
Rev. A.5 - Apr., 2013
www.anpec.com.tw
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