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参数资料
| 型号： | TC682COA |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHED CAPACITOR CONVERTER, 12 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | SOIC-8 |
| 文件页数： | 10/14页 |
| 文件大小： | 534K |
| 代理商： | TC682COA |
2006 Microchip Technology Inc.
DS21453C-page 5
TC682
4.0
TYPICAL APPLICATIONS
4.1
Negative Doubling Converter
The most common application of the TC682 is as a
charge pump voltage converter which provides a
negative output of two times a positive input voltage
FIGURE 4-1:
Inverting Voltage Doubler
4.2
Capacitor Selection
The output resistance of the TC682 is determined, in
part, by the ESR of the capacitors used. An expression
for ROUT is derived as shown below:
Assuming all switch resistances are approximately
equal:
ROUT is typically 140Ω at +25°C with VIN = +5V and 3.3
μF low ESR capacitors. The fixed term (16RSW) is
about 80-90
Ω. It can be seen easily that increasing or
decreasing values of C1 and C2 will affect efficiency by
changing ROUT. However, be careful about ESR. This
term can quickly become dominant with large electro-
values of C1 and C2 (assume 0.5
Ω ESR). C1 must be
rated at 6VDC or greater while C2 and C3 must be
rated at 12VDC or greater.
Output voltage ripple is affected by C3. Typically the
larger the value of C3 the less the ripple for a given load
current. The formula for P-P VRIPPLE is given below:
VRIPPLE = {1/[2(fPUMP x C3)] + 2(ESRC3)} (IOUT)
For a 10
μF (0.5Ω ESR) capacitor for C3, fPUMP = 10
kHz and IOUT = 10 mA the peak-to-peak ripple voltage
at the output will be less then 60 mV. In most
applications (IOUT < = 10 mA) a 10-20 μF capacitor and
1-5
μF pump capacitors will suffice. Table 4-2 shows
VRIPPLE for different values of C3 (assume 1Ω ESR).
TABLE 4-1:
OUTPUT RESISTANCE
VS. C1, C2
TABLE 4-2:
VRIPPLE PEAK-TO-PEAK
VS. C3 (IOUT 10mA)
GND
TC682
22
μF
22
μF
22
μF
7
6
5
4
3
2
1
+
VIN
C1+
C2+
C1–
C2–
V–OUT
C1
C2
V–OUT
+
VIN
C3
ROUT =2(RSW1 +RSW2 +ESRC1 +RSW3 +RSW4 +ESRC2)
+2(RSW1 +RSW2 +ESRC1 +RSW3 +RSW4 +ESRC2)
+1/(fPUMP x C1) +1/(fPUMP x C2)
+ESRC3
ROUT = 16RSW + 4ESRC1 + 4ESRC2 + ESRC3
+1/(fPUMP x C1) +1/(fPUMP x C2)
C1, C2 (
μF)
ROUT(Ω)
0.05
4085
0.10
2084
0.47
510
1.00
285
3.30
145
5.00
125
10.00
105
22.00
94
100.00
87
C3 (
μF)
VRIPPLE (mV)
0.50
1020
1.00
520
3.30
172
5.00
120
10.00
70
22.00
43
100.00
25
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TC682COA713 | 功能描述:电荷泵 Inverting V Doubler 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 |
| TC682CPA | 功能描述:电荷泵 Inverting V Doubler 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 |
| TC682EOA | 功能描述:电荷泵 Inverting V Doubler 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 |
| TC682EOA713 | 功能描述:电荷泵 Inverting V Doubler 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 |
| TC682EPA | 功能描述:电荷泵 Inverting V Doubler 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 |
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