APW7078 Ver la hoja de datos (PDF) - Anpec Electronics
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APW7078 Datasheet PDF : 16 Pages
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APW7078
Electrical Characteristics (Cont.)
(TA = 25°C, VDD = 3.3V, unless otherwise specified)
Symbol
Parameter
Test Conditions
PWM Controller Driver
ISOURCE Output Source Current
ISINK Output Sink Current
Control Block
VIL
Control Voltage
VIH
Duty<5%, OUT=0V
Duty>5%, OUT=5V
Active mode
Switch-off mode
Function Pin Description
APW7078
Unit
Min Typ Max
-150 -200
mA
150 200
mA
0.8VDD
0.2VDD
Pin No.
1
Symbol
INV
2
SCP
3
VDD
4
CTL
5
OUT
6
GND
7
OSC
8
FB
I/O
Description
I
Internal 0.5V reference voltage. Use a resistor divider to set the
output voltage.
-
Soft-start and short-circuit detection, connects a capacitor from the
pin to ground.
-
Power supply input pin for IC voltage.
I
Output control pin. Low = operating mode; High = shutdown mode.
O External MOSFET driving pin.
-
Ground pins of the IC.
-
Setting capacitor and resister to provide oscillation switching
frequency adjustment.
O Error amplifier output pin. Setting circuit for IC compensation.
Application Schematic
VIN
2.5V~4.2V
L1
D1
VOUT
C1
22uF
C2
0.1uF
C7
1uF
Q2
2N7002
R1
390K
1 INV
2 SCP
3 VDD
4 CTL
FB 8
OSC 7
GND 6
OUT 5
C3
R3
270pF
10uH
SS12
R5
1K
R4
3.3K
C4
0.1uF
Q1
APM2300A
C5
47uF
5V
300mA
C6
0.1uF
R2
820K
91K
Cp
33pF
*R2≦100KΩ is recommended
Fig1: APW7078 Step-up Application for Adjust Voltage
C opyright © ANPEC Electronics C orp.
4
Rev. A.3 - Nov., 2005
www.anpec.com.tw
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