參數(shù)資料
型號： TC682
廠商： TelCom Semiconductor, Inc.
英文描述： SNAP SWITCH 600VAC 15AMP AO +OPTIONS
中文描述： 反向電壓倍增
文件頁數(shù)： 4/6頁
文件大?。?/td> 80K
代理商： TC682
4-24
TELCOM SEMICONDUCTOR, INC.
TC682
INVERTING VOLTAGE DOUBLER
Capacitor Selection
The output resistance of the TC682 is determined, in
part, by the ESR of the capacitors used. An expression for
R
OUT
is derived as shown below:
R
OUT
= 2(R
SW1
+ R
SW2
+
ESR
C1
+ R
SW3
+ R
SW4
+ ESR
C2
)
+2(
R
SW1
+ R
SW2
+
ESR
C1
+ R
SW3
+ R
SW4
+ ESR
C2
)
+1/(f
PUMP
x C1) +1/(f
PUMP
x C2)
+ESR
C3
Assuming all switch resistances are approximately
equal...
R
OUT
= 16R
SW
+ 4ESR
C1
+ 4ESR
C2
+ ESR
C3
+1/(f
PUMP
x C1) +1/(f
PUMP
x C2)
R
OUT
is typically 140
at +25
°
C with V
IN
= +5V and
3.3
μ
F low ESR capacitors. The fixed term (16R
SW
) is about
80-90
. It can be seen easily that increasing or decreasing
values of C1 and C2 will affect efficiency by changing R
OUT
.
However, be careful about ESR. This term can quickly
become dominant with large electrolytic capacitors. Table 1
shows R
OUT
for various values of C1 and C2 (assume 0.5
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
V
RIPPLE
is given below:
V
RIPPLE
= {1/[2(f
PUMP
x C3)] + 2(ESR
C3
)} (I
OUT
)
For a 10
μ
F (0.5
ESR) capacitor for C3, f
PUMP
= 10kHz
and I
OUT
= 10mA the peak-to-peak ripple voltage at the
output will be less then 60mV. In most applications (I
OUT
<
= 10mA) a 10-20
μ
F capacitor and 1-5
μ
F pump capacitors
will suffice. Table 2 shows V
RIPPLE
for different values of C3
(assume 1
ESR).
Table 1. R
OUT
vs. C1, C2
C1, C2 (
μ
F)
0.05
0.10
0.47
1.00
3.30
5.00
10.00
22.00
100.00
R
OUT
(
)
4085
2084
510
285
145
125
105
94
87
Table 2. V
RIPPLE
Peak- to-Peak vs. C3 (I
OUT
= 10mA)
C3 (
μ
F)
0.50
1.00
3.30
5.00
10.00
22.00
100.00
V
RIPPLE
(mV)
1020
520
172
120
70
43
25
Paralleling Devices
Paralleling multiple TC682s reduces the output resis-
tance of the converter. The effective output resistance is the
output resistance of a single device divided by the number
of devices. As illustrated in Figure 5, each requires separate
pump capacitors C
1
and C
2
, but all can share a single
reservoir capacitor.
–5V Regulated Supply From A Single
3V Battery
Figure 6 shows a – 5V power supply using one 3V
battery. The TC682 provides – 6V at V
–
lated to – 5V by the negative LDO. The input to the TC682
can vary from 3V to 5.5V without affecting regulation appre-
ciably. A TC54 device is connected to the battery to detect
undervoltage. This unit is set to detect at 2.7V. With higher
input voltage, more current can be drawn from the outputs
of the TC682. With 5V at V
IN
, 10mA can be drawn from the
regulated output. Assuming 150
source resistance for the
converter, with I
L
OUT
, which is regu-
–
= 10mA, the charge pump will droop 1.5V.
相關(guān)PDF資料
PDF描述
TC682EPA INVERTING VOLTAGE DOUBLER
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TC682_13 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Inverting Voltage Doubler
TC682COA 功能描述:電荷泵 Inverting V Doubler RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube
TC682COA713 功能描述:電荷泵 Inverting V Doubler RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube
TC682CPA 功能描述:電荷泵 Inverting V Doubler RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube
TC682EOA 功能描述:電荷泵 Inverting V Doubler RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube
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