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參數(shù)資料
| 型號(hào)： | TC1044SMJA |
| 廠商： | TelCom Semiconductor, Inc. |
| 英文描述： | CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER |
| 中文描述： | 電荷泵型DC - DC電壓轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 4/8頁(yè) |
| 文件大?。?/td> | 141K |
| 代理商： | TC1044SMJA |
4-46
TELCOM SEMICONDUCTOR, INC.
The output characteristics of the circuit in Figure 3 are
those of a nearly ideal voltage source in series with 70
.
Thus, for a load current of –10mA and a supply voltage of
+5V, the output voltage would be – 4.3V.
The dynamic output impedance of the TC1044S 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
= 10
μ
F.
Paralleling Devices
Any number of TC1044S voltage converters may be
paralleled to reduce output resistance (Figure 4). The reser-
voir 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
= = 3.18
,
Figure 4. Paralleling Devices Lowers Output Impedance
1
2
3
4
8
7
6
5
TC1044S
V+
1
2
3
4
8
7
6
5
TC1044S
C1
RL
C2
C1
"n"
"1"
+
Dos and Don'ts
Do not exceed maximum supply voltages.
Do not connect the LV terminal to GND for supply
voltages greater than 3.5V.
Do not short circuit the output to V
+
supply for voltages
above 5.5V for extended periods; however, transient
conditions including start-up are okay.
When using polarized capacitors in the inverting mode,
the + terminal of C
1
must be connected to pin 2 of the
TC1044S 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 +12V, keeping in mind that
pin 6 (LV) is tied to the supply negative (GND) only for supply
voltages below 3.5V.
1
2
3
4
8
7
6
5
TC1044S
10μF
+
V
+
10μF
+
VOUT
*
NOTES:
*
C1
C2
Figure 3. Simple Negative Converter
TC1044S
CHARGE PUMP DC-TO-DC
VOLTAGE CONVERTER
R
OUT
(of TC1044S)
n (number of devices)
R
OUT
=
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