APW7080 查看數據表（PDF） - Anpec Electronics
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APW7080 Datasheet PDF : 23 Pages
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APW7080
Operating Waveforms (Cont.)
(Refer to the application circuit 1 in the section “Typical Application Circuits”, VIN=12V, VOUT=3.3V, L1=10µH)
Line Transient Response
VOUT
VIN = 12V --> 24V --> 24V
VIN rise/f all time=20µ s
1
VIN
24V
2
12V
Ch1 : VOUT, 50mV/Div, DC,
Voltage Offset = 3.3V
Ch2 : VIN, 5V/Div, DC,
Voltage Offset = 12V
Time : 50µs/Div
Pin Description
PIN
1
2
3
4
5
6
7
8
9
(Exposed Pad)
NAME
VIN
EN
UGND
VCC
LX
COMP
FB
GND
LX
FUNCTION
Power Input. VIN supplies the power (4.5V to 26V) to the control circuitry, gate driver and step-down
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.
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
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
4.2V 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.
Power Switching Output. Connect this pin to the underside Exposed Pad.
Output of 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 for
noise decoupling.
Feedback Input. The IC senses feedback voltage via FB and regulate the voltage at 0.8V.
Connecting FB with a resistor-divider from the output set the output voltage in the range from 0.8V
to 90% VIN.
Power and Signal Ground.
Power Switching Output. LX is the Drain of the P-channel MOSFET to supply power to the output.
The Exposed Pad provides current with lower impedance than Pin 5. Connect the pad to output LC
filter via a top-layer thermal pad on PCBs. The PCB will be a heat sink of the IC.
Copyright © ANPEC Electronics Corp.
10
Rev. A.6 - Jun., 2008
www.anpec.com.tw
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