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参数资料
| 型号： | TC7660CPA |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHED CAPACITOR REGULATOR, 10 kHz SWITCHING FREQ-MAX, PDIP8 |
| 封装： | PLASTIC, DIP-8 |
| 文件页数： | 16/18页 |
| 文件大小： | 396K |
| 代理商： | TC7660CPA |
2002 Microchip Technology Inc.
DS21465B-page 7
TC7660
5.0
APPLICATIONS INFORMATION
5.1
Simple Negative Voltage
Converter
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.
FIGURE 5-1:
Simple Negative Converter.
The output characteristics of the circuit in Figure 5-1
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.
5.2
Paralleling Devices
To reduce the value of ROUT, multiple TC7660 voltage
converters can be connected in parallel (Figure 5-2).
The output resistance will be reduced by approximately
a factor of n, where n is the number of devices
connected in parallel.
EQUATION
While each device requires its own pump capacitor
(C1), all devices may share one reservoir capacitor
(C2). To preserve ripple performance, the value of C2
should be scaled according to the number of devices
connected in parallel.
5.3
Cascading Devices
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
FIGURE 5-2:
Paralleling Devices Lowers Output Impedance.
FIGURE 5-3:
Increased Output Voltage By Cascading Devices.
+
V+
+
1
2
3
4
8
7
6
5
TC7660
VOUT*
C1
10 F
* VOUT = -V+ for 1.5V ≤ V+ ≤ 10V
C2
10 F
ROUT
ROUT of TC7660
()
n number of devices
()
---------------------------------------------------
=
VOUT
n
– V
+
()
=
ROUT
nR
× OUT of TC7660
()
=
“n”
“1”
RL
+
V+
+
1
2
3
4
8
7
6
5
TC7660
C1
C2
+
1
2
3
4
8
7
6
5
TC7660
C1
V
OUT *
“1”
+
V+
+
1
2
3
4
8
7
6
5
TC7660
10 F
* VOUT = -n V
+ for 1.5V ≤ V+ ≤ 10V
“n”
+
1
2
3
4
8
7
6
5
TC7660
10 F
+
10 F
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| TC7660EJA | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Charge Pump DC-to-DC Voltage Converter |
| TC7660EOA | 功能描述:电荷泵 DC-DC Converter RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
| TC7660EOA | 制造商:Microchip Technology Inc 功能描述:ICS POWER SUPPLY PACKAGE/CASE:8-SOIC |
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