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參數(shù)資料
| 型號(hào)： | AND8098 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | Low-Cost 100 mA High-Voltage Buck and Buck-Boost Using NCP1052 |
| 中文描述： | 低成本百毫安高電壓降壓和降壓升壓使用NCP1052 |
| 文件頁數(shù)： | 8/10頁 |
| 文件大?。?/td> | 93K |
| 代理商： | AND8098 |
AND8098/D
http://onsemi.com
8
Figure 10. 12V / 100mA Buck Performance
OUTPUT CURRENT (mA)
(a) Load Regulation
150
10
50
4
350
0
O
0
14
2
6
8
250
200
100
12
300
V
IN
= 100 Vdc
V
IN
= 300 Vdc
V
IN
= 200 Vdc
OUTPUT CURRENT (mA)
(b) Efficiency
150
50
50
20
300
0
E
0
80
10
30
40
250
200
100
60
V
IN
= 100 Vdc
V
IN
= 300 Vdc
V
IN
= 200 Vdc
70
Dual Output Buck-boost with Increased Output
Current Capability
Replacing NCP1052 by NCP1055, which is with a current
limit of 680 mA, the output current capability is increased.
Larger value of inductor L is selected for high current. On
the other hand, the current consumption of NCP1055 is
higher than NCP1052 and the startup transient time is longer
in a higher power application. Hence, the V
CC
capacitor is
increased. When the V
CC
capacitor increased, its charging
frequency is decreased. Output capacitor is also needed to be
increased to reduce this lower-frequency charging current/
ripple.
In addition, by adding one more auxiliary winding to the
inductor a secondary output is made. A typical example is
shown in Figure 11. In higher output current application, the
load regulation is the major problem. The 5.1k
resistor
plays an important role for the load regulation. The primary
output voltage is higher than the secondary because it can
increase the output current ability by stepping up the current
in the transformer. The line regulation is shown in Figure 12
when the output currents are constant.
Figure 11. Dual Output Buck-boost
Universal
AC Input
GND
1N4005
10
μ
F
1N4005 1N4746
MUR160
5.1k
MUR160
MUR160
22
μ
F
1
μ
F
150
μ
F
220
μ
F
-24V / 200mA
-5V / 150mA
1.2mH / 92.3
μ
H
NCP1055P100
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