APW7311 データシートの表示（PDF） - Anpec Electronics
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APW7311 Datasheet PDF : 16 Pages
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APW7311
Pin Description
PIN
FUNCTION
SOP-8P
Name
1
BS
High-Side G ate Drive Boost Input. BS supp lies 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 APW7311 senses the feedback voltag e via FB and regulates the voltage
5
FB
at 0.925V. Connecting FB with a resistor-divider from the converter’s output sets the output voltage
from 0.925V to 17V.
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
8
SS
the 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 Pad
Connect the exposed pad to the system ground plan with large copper area for dissipating heat into
the ambient air.
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.
5
Rev. P.1 - Jan., 2013
www.anpec.com.tw
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