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参数资料
| 型号： | TC1240ECH |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHED CAPACITOR CONVERTER, 125 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封装： | SOT-23A, 6 PIN |
| 文件页数： | 15/16页 |
| 文件大小： | 472K |
| 代理商： | TC1240ECH |
TC1240/TC1240A
DS21516B-page 8
2002 Microchip Technology Inc.
4.7
Cascading Devices
Two or more TC1240s or TC1240As can be cascaded
to increase output voltage (Figure 4-4). If the output is
lightly loaded, it will be close to ((n + 1) x VIN) but will
droop at least by ROUT of the first device multiplied by
the IQ of the second. It can be seen that the output
resistance rises rapidly for multiple cascaded devices.
For the case of the two-stage ‘tripler’ output resistance
can be approximated as ROUT =2xROUT1 +ROUT2,
where ROUT1 is the output resistance of the first stage,
and ROUT2 is the output resistance of the second stage.
4.8
Paralleling Devices
To reduce the value of ROUT, multiple TC1240s or
TC1240As can be connected in parallel (Figure 4-5).
The output resistance will be reduced by a factor of N
where N is the number of TC1240s or TC1240As. Each
device will require its own pump capacitor (C1x), but all
devices may share one reservoir capacitor (C2).
However, to preserve ripple performance the value of
C2 should be scaled according to the number of
paralled TC1240s or TC1240As, respectively.
4.9
Layout Considerations
As with any switching power supply circuit good layout
practice is recommended. Mount components as close
together as possible to minimize stray inductance and
capacitance. Also use a large ground plane to minimize
noise leakage into other circuitry.
FIGURE 4-4:
CASCADING MULTIPLE DEVICES TO INCREASE OUTPUT VOLTAGE
FIGURE 4-5:
PARALLELING MULTIPLE DEVICES TO REDUCE OUTPUT RESISTANCE
C+
GND
C-
OUT
3
2
5
1
6
TC1240
TC1240A
SHDN
4
VIN
C+
GND
C-
OUT
C1A
3
2
5
1
6
C2B
VIN
VOUT
VOUT = (n + 1)VIN
TC1240
TC1240A
SHDN
4
"1"
+
VIN
C1B
C2A
+
C1A
C1B
6
4
2
3
2
5
1
5
3
C2
VOUT
VOUT = 2xVIN
ROUT = ROUT OF SINGLE DEVICE
VIN
NUMBER OF DEVICES
TC1240
TC1240A
TC1240
TC1240A
...
SHDN
Shutdown
Control
4
6
VIN
+
"1"
"n"
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TC1240ECHTR | 功能描述:电荷泵 Positive Doubling 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 |
| TC1240ECHTR-CUT TAPE | 制造商:Microchip 功能描述:TC1240 Series 2.5 to 5.5 V Positive Doubling Charge Pump w/ Shutdown - SOT-23-6 |
| TC1240I/CHTR | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Positive Doubling Charge Pumps with Shutdown in a SOT-23 Package |
| TC1240ICHTR | 制造商:Microchip Technology Inc 功能描述: |
| TC124A | 制造商:Thomas & Betts 功能描述:Fittings Connector 1.25inch Steel |
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