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參數(shù)資料
| 型號： | TC660 |
| 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電壓轉換器 |
| 文件頁數(shù)： | 6/8頁 |
| 文件大小： | 122K |
| 代理商： | TC660 |
4-10
TELCOM SEMICONDUCTOR, INC.
TC660
100mA CHARGE PUMP DC-TO-DC
VOLTAGE CONVERTER
The output characteristics of the circuit in Figure 3 are
those of a nearly ideal voltage source in series with 6.5
.
Thus, for a load current of –100mA and a supply voltage of
+5V, the output voltage would be – 4.35V.
The dynamic output impedance of the TC660 is due,
primarily, to capacitive reactance of the charge transfer
capacitor (C
1
). Since this capacitor is connected to the
output for only 1/2 of the cycle, the equation is:
2
2
π
f
C
1
where f = 10 kHz and C
1
= 150
μ
F.
Paralleling Devices
Any number of TC660 voltage converters may be paral-
leled to reduce output resistance (Figure 4). The reservoir
capacitor, C
2
, serves all devices, while each device requires
its own pump capacitor, C
1
. The resultant output resistance
would be approximately:
X
C
= = 0.21
,
Figure 4. Paralleling Devices Lowers Output Impedance
Dos and Don'ts
Do not exceed maximum supply voltages.
Do not connect the LV terminal to GND for supply
voltages greater than 3.0V.
Do not short circuit the output to V
+
in inverting mode
and for more than 10 sec (a very slow startup!) in
doubler mode.
When using polarized capacitors in the inverting mode,
the + terminal of C
1
must be connected to pin 2 of the
TC660 and the + terminal of C
2
must be connected to
GND.
Simple Negative Voltage Converter
Figure 3 shows typical connections to provide a nega-
tive 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 +5.5V, keeping in mind that
pin 6 (LV) is tied to the supply negative (GND) only for supply
voltages below 3.0V.
R
OUT
(of TC660)
n (number of devices)
R
OUT
=
Figure 3. Simple Negative Converter
1
2
3
4
8
7
6
5
TC660
150 μF
+
V
+
150 μF
+
VOUT
*
1. VOUT= –V+ for 1.5V
≤
V+
≤
5.5V
NOTES:
*
C1
C2
1
2
3
4
8
7
6
5
TC660
V+
1
2
3
4
8
7
6
5
TC660
C1
RL
C2
C1
"n"
"1"
+
相關PDF資料 |
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|---|---|
| TC660CPA | 100mA CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER |
| TC660COA | 100mA CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER |
| TC660EOA | 100mA CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER |
| TC682COA | INVERTING VOLTAGE DOUBLER |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TC660COA | 制造商:TELCOM 制造商全稱:TelCom Semiconductor, Inc 功能描述:100mA CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER |
| TC660CPA | 制造商:TELCOM 制造商全稱:TelCom Semiconductor, Inc 功能描述:100mA CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER |
| TC660EOA | 制造商:TELCOM 制造商全稱:TelCom Semiconductor, Inc 功能描述:100mA CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER |
| TC660EPA | 制造商:TELCOM 制造商全稱:TelCom Semiconductor, Inc 功能描述:100mA CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER |
| TC664 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:SMBus⑩ PWM Fan Speed Controllers With Fan Fault Detection |
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