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参数资料
| 型号： | TCM680COATR |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHED CAPACITOR CONVERTER, 21 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | 0.150 INCH, PLASTIC, MS-012, SOIC-8 |
| 文件页数： | 18/18页 |
| 文件大小： | 322K |
| 代理商： | TCM680COATR |
2005 Microchip Technology Inc.
DS21486C-page 9
TCM680
5.3
Paralleling Devices
To reduce the value of ROUT
- and R
OUT
+, multiple
TCM680 voltage converters can be connected in paral-
lel (Figure 5-2). The output resistance of both outputs
will be reduced, approximately, by a factor of n, where
n is the number of devices connected in parallel.
EQUATION
Each device requires its own pump capacitors, but all
devices may share the same reservoir capacitors. To
preserve ripple performance, the value of the reservoir
capacitors should be scaled according to the number of
devices connected in parallel.
5.4
Output Voltage Regulation
The outputs of the TCM680 can be regulated to provide
+5V from a 3V input source (Figure 5-3). The TCM680
performs voltage multiplication and inversion produc-
ing output voltages of, approximately, +6V. The
TCM680 outputs are regulated to +5V with the linear
regulators TC55 and TC59. The TC54 is a voltage
detector providing an indication that the input source is
low and that the outputs may fall out of regulation. The
input source to the TCM680 can vary from 2.8V to 5.5V
without adversely affecting the output regulation mak-
ing this application well suited for use with single cell
Li-Ion batteries or three alkaline or nickel based
batteries connected in series.
FIGURE 5-2:
Paralleling TCM680 for Lower Output Source Resistance.
ROUT
- = R
OUT
- (of TCM680)
n (number of devices)
ROUT
+ = R
OUT
+ (of TCM680)
n (number of devices)
10 F
22 F
VIN
GND
Supply
TCM680
+
–
+
–
+
–
+
–
+
–
VIN
C1
+
C2
+
C1
-
C2
-
VOUT
-
VOUT
-
10 F
VIN
GND
C1
+
C2
+
C1
-
C2
-
Negative
Supply
Positive
22 F
+
–
VOUT
+
VOUT
+
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