参数资料
型号: NCP1729SN35T1G
厂商: ON Semiconductor
文件页数: 14/22页
文件大小: 0K
描述: IC REG SWITCHD CAP INV ADJ 6TSOP
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:
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: 标准包装
供应商设备封装: 6-TSOP
产品目录页面: 1118 (CN2011-ZH PDF)
其它名称: NCP1729SN35T1GOSDKR
NCP1729
?V out
1
6
R 1
+
OSC
V in
+
2
5
+
R 2
3
4
10 k
Capacitors = 3.3 m F
Figure 32. Line and Load Regulated Negative Output Voltage
An adjustable shunt regulator can be used with the shutdown input to give excellent closed loop regulation performance. The
shunt regulator acts as a comparator with a precise input offset voltage which significantly reduces the converter ’s output
resistance and dramatically enhances the line and load regulation. For closed loop operation, the desired regulated output
voltage must be lower in magnitude than ?V in . The output will regulate at a level of ?V ref (R 2 /R 1 + 1). The adjustable shunt
regulator can be from either the TLV431 or TL431 families. The comparator offset or reference voltage is 1.25 V or 2.5 V
respectively. The performance characteristics for the converter are shown below. Note that the dashed curve sections represent
the converter ’s open loop performance.
?1.0
T A = 25 ° C
A
?0.5
I out = 25 mA
R 1 = 10 k
?2.0
?3.0
?4.0
B
?1.5
?2.5
?3.5
R 2 = 24 k
T A = 25 ° C
?5.0
0
10
20
30
40
50
60
70
?4.5
1.0
2.0
3.0
4.0
5.0
6.0
I out , OUTPUT CURRENT (mA)
Figure 33. Load Regulation, Output Voltage vs.
Output Current
V in , INPUT VOLTAGE (V)
Figure 34. Line Regulation, Output Voltage vs.
Input Current
Curve
A
B
V in (V)
3.0
5.0
R 1 ( W )
10 k
10 k
R 2 ( W )
5.0 k
24 k
V out (V)
?1.8
?4.2
http://onsemi.com
14
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