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參數(shù)資料
| 型號(hào)： | TC660COA |
| 廠商： | TelCom Semiconductor, Inc. |
| 英文描述： | 100mA CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER |
| 中文描述： | 100mA的電荷泵型DC - DC電壓轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 8/8頁(yè) |
| 文件大?。?/td> | 122K |
| 代理商： | TC660COA |
4-12
TELCOM SEMICONDUCTOR, INC.
TC660
100mA CHARGE PUMP DC-TO-DC
VOLTAGE CONVERTER
Figure 8. Positive Voltage Doubler
Figure 9 shows an improved way of using the TC660 as
a voltage doubler.
In this circuit, C1 is first charged to V
IN
and C2 is quickly
brought to within a diode drop of V
IN
(to prevent substrate
reversal) through D. The optional 200
resistor is only to
limit the brief latchup current.
On the next half-cycle, V
IN
is in series with C1; C2 is then
charged to 2 V
IN
. D is now reverse-biased and plays no
further part. For V
IN
< 3V, R may be necessary to ensure
startup.
Figure 9. Improved Voltage Doubler
1
2
3
4
8
7
6
5
R = 0.1 – 1M
C1
200
R
D
VOUT
= 2 VIN
VIN
C2
TC660
Figure 10. Combined Negative Converter and Positive Multiplier
Combined Negative Voltage Conversion
and Positive Supply Multiplication
Figure 10 combines the functions shown in Figures 3
and 8 to provide negative voltage conversion and positive
voltage multiplication simultaneously. In this instance, ca-
pacitors C
1
and C
3
perform the pump and reservoir func-
tions, respectively, for the generation of the negative volt-
age, while capacitors C
2
and C
4
are pump and reservoir,
respectively, for the multiplied positive voltage. There is a
penalty in this configuration in that the source impedances
of the generated supplies will be somewhat higher due to
the finite impedance of the common charge pump driver at
pin 2 of the device.
Figure 11. Positive Voltage Multiplier
1
2
3
4
8
7
6
5
+
V+
VOUT =
(2 V+) – (2 VF)
C1
D1
+
+
C3
C4
VOUT = –V+
C2
TC660
D2
+
1
2
3
4
8
7
6
5
V+
VOUT =
(2 V+) – (2 VF)
+
C2
D1
D2
+
C1
TC660
Efficient Positive Voltage
Multiplication/Conversion
Since the switches that allow the charge pumping op-
eration are bidirectional, the charge transfer can be per-
formed backward as easily as forward. Figure 11 shows a
TC660 transforming –5V to +5V. The only problem here is
that the internal clock and switch-drive section will not
operate until some positive voltage has been generated. A
diode and resistor shown dotted in Figure 11 can be used to
"force" the internal regulator on.
1
2
3
4
8
7
6
5
+
VOUT = –V–
150
μ
F
+
1 M
V– INPUT
C1
150
μ
F
TC660
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