參數(shù)資料
型號(hào)： TCM680EPA
廠商： TelCom Semiconductor, Inc.
英文描述： +5V TO 【10V VOLTAGE CONVERTER
中文描述： 5V至【10V的電壓轉(zhuǎn)換器
文件頁(yè)數(shù)： 5/7頁(yè)
文件大?。?/td> 96K
代理商： TCM680EPA
4-17
TELCOM SEMICONDUCTOR, INC.
7
6
5
4
3
1
2
8
TCM680
+5V TO
±
10V VOLTAGE CONVERTER
Table 1. R
OUT
vs. C1 ,C2
C1, C2 (
μ
F)
0.1
0.47
R
OUT
(
)
1089
339
232
165
157
146
141
137
1
3.3
4.7
10
22
100
Table 2. V
RIPPLE (p-p)
vs. C3, C4 (I
OUT
= 10mA)
C3, C4 (
μ
F)
0.47
1
3.3
4.7
10
22
100
V
RIPPLE
(mV)
1540
734
236
172
91
52
27
Paralleling Devices
Paralleling multiple TCM680s reduces the output resis-
tance of both the positive and negative converters. The
effective output resistance is the output resistance of a
single device divided by the number of devices. As illus-
trated in Figure 7, each requires separate pump capacitors
C
1
and C
2
, but all can share a single set of reservoir
capacitors.
±
5V Regulated Supplies From A Single
3V Battery
Figure 8 shows a complete
±
5V power supply using one
3V battery. The TCM680 provides +6V at V
+
regulated to +5V by the TC55, and –5V by the negative LDO.
The input to the TCM680 can vary from 3V to 6V without
affecting regulation appreciably. With higher input voltage,
more current can be drawn from the outputs of the TCM680.
With 5V at V
IN
, 10mA can be drawn from both regulated
outputs simultaneously. Assuming 150
source resistance
for both converters, with (I
+
pump will droop 3V, providing +7V for the negative charge
pump.
OUT
, which is
L
+ I
L
) = 20mA, the positive charge
C
1
C
2
V
OUT
V
OUT
C
OUT
V
IN
V
IN
V
IN
GND
GND
10
μ
F
10
μ
F
22
μ
F
10
μ
F
10
μ
F
NEGATIVE
SUPPLY
TCM680
C
2
C
1
C
2
C
1
C
1
C
2
TCM680
GND
+
–
+
–
+
–
+
–
+
–
+
+
–
–
+
–
–
–
–
+
–
Figure 7. Paralleling TCM680 for Lower Output Source Resistance
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