ACT4070
TYPICAL PERFORMANCE CHARACTERISTICS
(Circuit of Figure 3, unless otherwise specified.)
Efficiency vs. Output Current
100
90
80
V
IN
= 8V
100
90
80
ACT4070-0001
Efficiency vs. Output Current
ACT4070-0002
V
IN
= 8V
Efficiency (%)
60
50
40
30
20
10
0
0.01
0.1
1
V
IN
= 20V
V
IN
= 30V
Efficiency (%)
70
V
IN
= 12V
70
60
50
40
30
20
10
V
IN
= 12V
V
IN
= 20V
V
OUT
= 2.5V
L = 10µH
C
IN
= 22µF
C
OUT
= 22µF
V
IN
= 30V
V
OUT
= 5V
L = 15µH
C
IN
= 22µF
C
OUT
= 22µF
10
0
0.01
0.1
1
10
Output Current (A)
Output Current (A)
Feedback Voltage vs. Temperature
1.27
500
Switching Frequency vs. Input Voltage
ACT4070-0004
1.25
Switching Frequency (kHz)
ACT4070-0003
Feedback Voltage (V)
450
1.23
400
1.21
1.19
1.17
-40
-20
0
20
40
60
80
100
350
300
8
10
12
14
16
18
20
22
24
26
28
30
Temperature (°C)
Input Voltage (V)
Shutdown Supply Current vs. Input Voltage
18
Surface Temperature vs. Output Current
140
ACT4070-006
V
OUT
= 5V
L = 15
µ
H
C
IN
= 22
µ
F
C
OUT
= 22
µ
F
ACT4070-0005
Shutdown Supply Current (µA)
Surface Temperature (°C)
16
14
12
10
8
6
4
2
0
5
10
15
20
25
120
100
80
60
40
V
IN
= 30V
V
IN
= 20V
V
IN
= 12V
20
0
30
0
0.5
1
1.5
2
2.5
3
Input Voltage (V)
Output Current (A)
Innovative Products.
Active Solutions.
-8-
Copyright © 2006 Active-Semi, Inc.
ACTIVE-SEMI [ ACTIVE-SEMI, INC ]
