APW7304 查看數據表（PDF） - Anpec Electronics
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APW7304 Datasheet PDF : 19 Pages
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APW7304
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
2
VIN converter 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. Connect the exposed pad on backside to Pin 4.
Output feedback Input. The APW7304 senses the feedback voltage via FB and regulates the voltage at
5
FB 0.8V. Connecting FB with a resistor-divider from the converter’s output sets the output voltage from 0.8V 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. 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.
9
Exposed Connect the exposed pad to the system ground plan with large copper area for dissipating heat into the
Pad ambient air.
Block Diagram
VIN
2
Over
Temperature
Protection
Power-On-
Reset
LOC
Current
Limit
Current Sense
Amplifier
5V
5V
6µA
SS 8
OTP
POR
Fault
Logics
Inhibit
Gate
Control
FB 5
Gm
VREF
Error
Amplifier
COMP 6
2.5V
UVLO
Current
Compartor
Slope
Compensation
EN 7
1.5V
Enable
Internal
5V
Regulator
VIN
Oscillator
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.3 - Apr., 2013
www.anpec.com.tw
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