AP1537 データシートの表示（PDF） - Anachip Corporation
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AP1537 Datasheet PDF : 7 Pages
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PWM Control 3A Step-Down Converter
AP1537
Electrical Characteristics (VIN = 12V, Ta=25°C, unless otherwise specified)
Symbol
Parameter
Conditions
VIN
VFB
IFB
ISW
ISSS
∆VOUT
/VOUT
∆VOUT
/VOUT
fOSC
fOSC1
VSH
VSL
ISH
ISL
TSS
RDSON
EFFI
Input Voltage
Feedback Voltage
Feedback Bias Current
Switch Current
Current Consumption
During Power Off
Line Regulation
--
IOUT=0.1A
IOUT=0.1A
--
VEN =0V
VIN = 5V~18V, IOUT=0.2A
Load Regulation
IOUT = 0.1 to 3A
Oscillation Frequency
Measure waveform at SW pin
Frequency of Current Limit
or Short Circuit Protect
Measure waveform at SW pin
EN Pin Input Voltage
Evaluate oscillation at SW pin
Evaluate oscillation stop at SW pin
EN Pin Input Leakage
Current
VIN = 12V
--
Soft-Start Time
--
Internal MOSFET Rdson
VIN=5V, VFB=0V
VIN=12V, VFB=0V
Efficiency
VIN = 12V, VOUT = 5V
IOUT = 3A
Min.
3.6
0.784
-
3.5
-
Typ.
-
0.8
0.1
-
10
Max. Unit
18 V
0.816 V
0.5 µA
-
A
- µA
-
1
2%
-
0.2 0.5 %
400 500 600 KHz
40
-
- KHz
2.0
-
-
-
-
0.8
V
-10
-
10 µA
-10
-
10 µA
0.3
2
5 ms
-
-
110
70
150
100
mΩ
-
91
-
%
Typical Application Circuit
VIN
Vcc
Output
CIN
22uF
CVcc
0.1uF
REN
100K
EN
CEN
0.1uF
AP1537
FB
VSS Comp
L1
22uH
CC
10nF
1K 1800pF
D1
VOUT =5V
RA
6.8K
+C +
- 0.1uF-
RB
1.3K
COUT
33uF
VOUT
L1 Value
Note: VOUT = VFB x (1+RA/RB)
RB=0.7K~5K ohm
VIN=12V, IMAX=3A
2.5V
3.3V
18uH
22uH
5V
22uH
Anachip Corp.
www.anachip.com.tw
Rev. 1.3 May 09, 2006
3/7
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