APW7336QB 查看數據表（PDF） - Anpec Electronics
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APW7336QB Datasheet PDF : 20 Pages
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APW7336
Pin Description
PIN
NO.
TDFN3x3-10
NAME
3
BS
4.5
VIN
6
LX
7.8
GND
9
FB
10
COMP
1
EN
2
SS
Block Diagram
FUNCTION
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 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.
Power Switching Output. LX is the Drain of the N-Channel power MOSFET to supply
power to the output LC filter.
Ground.
Output feedback Input. The APW7336 senses the feedback voltage via FB and regulates
the voltage at 0.8V. Connecting FB with a resistor-divider from the converter’s output sets
the output voltage from 0.8V to 20V.
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.
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 soft-start period. A 0.1µF capacitor sets the soft-start period to 15ms. To
disable the soft-start feature, leave SS unconnected.
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.3 - Jul., 2013
www.anpec.com.tw
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