参数资料
| 型号： | NCP1729SN35T1 |
| 厂商： | ON Semiconductor |
| 文件页数： | 21/22页 |
| 文件大小： | 0K |
| 描述： | IC REG SWITCHD CAP INV ADJ 6TSOP |
| 产品变化通告： | LTB Notification 03/Jan/2008 |
| 标准包装： | 1 |
| 类型： | 切换式电容器（充电泵），反相 |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | -1.15 V ~ -5.5 V，2.3 V ~ 11 V |
| 输入电压： | 1.15 V ~ 5.5 V |
| 频率 - 开关： | 35kHz |
| 电流 - 输出： | 50mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SC-74，SOT-457 |
| 包装： | 剪切带 (CT) |
| 供应商设备封装： | 6-TSOP |
| 其它名称： | NCP1729SN35T1OSCT |
NCP1729
?V out
R 1
+
1
OSC
6
R 2
V in
+
2
3
5
4
+
10 k
+
+
+V out
Capacitors = 10 m F
Figure 49. Combination of a Closed Loop Negative Inverter with a Positive Output Voltage Doubler
All of the previously shown converter circuits have only single outputs. Applications requiring multiple outputs can be
constructed by incorporating combinations of the former circuits. The converter shown above combines Figures 26 and 32 to
form a regulated negative output inverter with a non?regulated positive output doubler. The magnitude of ?V out is controlled
by the resistor values and follows the relationship ?V ref (R 2 /R 1 + 1). Since the positive output is not within the feedback loop,
its output voltage will increase as the negative output load increases. This cross regulation characteristic is shown in the upper
portion of Figure 50. The dashed line is the open loop and the solid line is the closed loop configuration for the load regulation.
The load regulation for the positive doubler with a constant load on the ?V out is shown in Figure 51.
9.0
Positive Doubler
10.0
8.0
?3.0
I out = 15 mA
R out = 45 W ? Open Loop
R out = 2 W ? Closed Loop
9.0
?4.0
Negative Inverter
R1 = 10 k, R2 = 20 k
T A = 25 ° C
8.0
Negative Inverter I out = 15 mA
R 1 = 10 k W
R 2 = 20 k W
T A = 25 ° C
?5.0
7.0
0
10
20
30
0
10
20
30
40
50
I out , NEGATIVE INVERTER OUTPUT CURRENT (mA)
Figure 50. Load Regulation, Output Voltage
vs. Output Current
I out , POSITIVE DOUBLER OUTPUT CURRENT (mA)
Figure 51. Load Regulation, Output Voltage
vs. Output Current
V in
+
IC1
C 1
C 2
?V out
SHDN
GND
C 3
+
+
GND
0.5 ″
Inverter Size = 0.5 in x 0.2 in
Area = 0.10 in 2 , 64.5 mm 2
Figure 52. Inverter Circuit Board Layout, Top View Copper Side
http://onsemi.com
21
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