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| 型号： | TC7660CPA |
| 厂商： | Microchip Technology |
| 文件页数： | 7/20页 |
| 文件大小： | 0K |
| 描述： | IC REG SWITCHED CAP INV ADJ 8DIP |
| 标准包装： | 60 |
| 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： | -1.5 V ~ -10 V |
| 输入电压： | 1.5 V ~ 10 V |
| 频率 - 开关： | 10kHz |
| 电流 - 输出： | 20mA |
| 同步整流器： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 包装： | 管件 |
| 供应商设备封装： | 8-PDIP |
| 产品目录页面： | 664 (CN2011-ZH PDF) |
| 其它名称： | 158-1137 158-1137-ND |
TC7660
5.0
APPLICATIONS INFORMATION
5.2
Paralleling Devices
5.1
Simple Negative Voltage
Converter
To reduce the value of R OUT , multiple TC7660 voltage
converters can be connected in parallel ( Figure 5-2 ).
The output resistance will be reduced by approximately
R OUT ? of TC7660 ?
R OUT = ---------------------------------------------------------
Figure 5-1 shows typical connections to provide a
negative supply where a positive supply is available. A
similar scheme may be employed for supply voltages
anywhere in the operating range of +1.5V to +10V,
keeping in mind that pin 6 (LV) is tied to the supply
negative (GND) only for supply voltages below 3.5V.
V +
a factor of n, where n is the number of devices
connected in parallel.
EQUATION
n ? number of devices ?
While each device requires its own pump capacitor
C 1
10 μF
+
1
2
3
4
TC7660
8
7
6
5
V OUT *
C 2
+ 10 μF
(C 1 ), all devices may share one reservoir capacitor
(C 2 ). To preserve ripple performance, the value of C 2
should be scaled according to the number of devices
connected in parallel.
5.3 Cascading Devices
V OUT = – n ? V ?
* V OUT = -V + for 1.5V ? V+ ? 10V
FIGURE 5-1: Simple Negative Converter.
are those of a nearly ideal voltage source in series with
a 70 ?? resistor. Thus, for a load current of -10 mA and
a supply voltage of +5V, the output voltage would be
-4.3V.
A larger negative multiplication of the initial supply volt-
age can be obtained by cascading multiple TC7660
devices. The output voltage and the output resistance
will both increase by approximately a factor of n, where
n is the number of devices cascaded.
EQUATION
+
R OUT = n ? R OUT ? of TC7660 ?
V +
1
8
C 1
+
2
3
4
TC7660
“1”
7
6
5
C 1
+
1
2
3
TC7660
8
7
6
R L
4
“n”
5
+
C 2
FIGURE 5-2:
Paralleling Devices Lowers Output Impedance.
V +
1
8
10 μF
+
2
3
4
TC7660
“1”
7
6
5
10 μF
+
1
2
3
TC7660
8
7
6
4
“n”
5
V OUT *
* V OUT = -n
V +
for 1.5V ? V+ ? 10V
+
10 μF
+
10 μF
FIGURE 5-3:
Increased Output Voltage By Cascading Devices.
? 2002-2011 Microchip Technology Inc.
DS21465C-page 7
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相关代理商/技术参数 |
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|---|---|
| TC7660CPA | 制造商:TELCOM SEMICONDUCTOR 功能描述:IC VOLT CONVERTER 7660 DIP8 |
| TC7660CPA | 制造商:Microchip Technology Inc 功能描述:DC-DC Converter |
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