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參數資料
| 型號： | NCP1729SN35T1 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 穩壓器 |
| 英文描述： | Switched Capacitor Voltage Inverter |
| 中文描述： | SWITCHED CAPACITOR CONVERTER, 54 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封裝： | SOT-23, TSOP-6 |
| 文件頁數： | 16/22頁 |
| 文件大小： | 165K |
| 代理商： | NCP1729SN35T1 |
NCP1729
http://onsemi.com
16
+
6
4
2
3
1
OSC
+
V
in
5
V
out
Q
1
C
3
V
out
= V
in
V
BE(Q1)
V
BE(Q2)
2 V
F
+
C
2
Q
2
C
1
C
1
= C
2
= 470 F
C
3
= 220 F
Q
1
= PZT751
Q
2
= PZT651
Figure 37. External Switch for Increased Negative Output Current
The output current capability of the NCP1729 can be extended beyond 600 mA with the addition of two external switch
transistors and two Schottky diodes. The output voltage is approximately equal to V
in
minus the sum of the base emitter drops
of both transistors and the forward voltage of both diodes. The performance characteristics for the converter are shown below.
Note that the output resistance is reduced to 1.0 .
2.6
I
out
, OUTPUT CURRENT (mA)
Figure 38. Current Boosted Load Regulation,
Output Voltage vs. Output Current
V
o
,
0
0.4
0.5
0.3
0.2
0.1
0.6
3.2
2.4
2.8
2.2
2.0
V
in
= 5.0 V
R
out
= 1.0
T
A
= 25
°
C
3.0
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