APW7143KI-TRG Ver la hoja de datos (PDF) - Anpec Electronics
Número de pieza
componentes Descripción
Lista de partido
APW7143KI-TRG Datasheet PDF : 19 Pages
| |||
APW7143
Operating Waveforms (Cont.)
(Refer
to
the
application
circuit
1
in
the
section
“Typical
Application
Circuits”,
V =12V,
IN
V =3.3V,
OUT
L1=4.7µH
)
Line Transient
VIN= 5~12V
VIN
VIN rising/falling time=20µs
1
VOUT
2
IL1
3
CH1 : VIN , 5V/div
CH2 : VOUT , 50mV/div (Voffset=3.3V)
CH3 : IL1 , 2A/div
Time : 100µs/div
Pin Description
PIN No.
NAME
1
VIN
2
NC
3
AGND
4
FB
5
COMP
6
EN
7, 8
LX
FUNCTION
Power Input. VIN supplies the power (4.3V to 14V) to the control circuitry, gate driver,
and step-down converter switch. Connecting a ceramic bypass capacitor and a suitably
large capacitor between VIN and AGND eliminates switching noise and voltage ripple on
the input to the IC.
No Connection.
Ground of MOSFET Gate Driver and Control Circuitry.
Output feedback Input. The APW7143 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 VIN.
Output of the error amplifier. Connect a series RC network from COMP to AGND to
compensate the regulation control loop. In some cases, an additional capacitor from
COMP to AGND is required.
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. Connect this pin to VIN if it is not used.
Power Switching Output. LX is the Drain of the P-Channel power MOSFET to supply
power to the output LC filter.
Copyright © ANPEC Electronics Corp.
9
Rev. A.1 - Apr., 2008
www.anpec.com.tw
Share Link: 