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参数资料
| 型号： | TCM829ECTRT |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHED CAPACITOR CONVERTER, 54.3 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封装： | EIAJ, SC-74A, SOT-23A, 5 PIN |
| 文件页数： | 5/9页 |
| 文件大小： | 71K |
| 代理商： | TCM829ECTRT |
5
TCM828/829-4 5/22/00
TCM828
TCM829
Switched Capacitor
Voltage Converters
2001 Microchip Technology Inc.
DS21488A
Diode Protection for Heavy Loads
When heavy loads require the OUT pin to sink large
currents being delivered by a positive source, diode protec-
tion may be needed. The OUT pin should not be allowed to
be pulled above ground. This is accomplished by connect-
ing a Schottky diode (1N5817) as shown in Figure 7.
Layout Considerations
As with any switching power supply circuit good layout
practice is recommended. Mount components as close
together as possible to minimize stray inductance and
capacitance. Also use a large ground plane to minimize
noise leakage into other circuitry.
Voltage Doubler/Inverter
Another common application of the TCM828/829 is
shown in Figure 6. This circuit performs two functions in
combination. C1 and C2 form the standard inverter circuit
described above. C3 and C4 plus the two diodes form the
voltage doubler circuit. C1 and C3 are the pump capacitors
and C2 and C4 are the reservoir capacitors. Because both
sub-circuits rely on the same switches if either output is
loaded, both will droop toward GND. Make sure that the total
current drawn from both the outputs does not total more
than 40mA.
Figure 6. Combined Doubler and Inverter
Figure 7. High V– Load Current
C1
D1
D2
D1, D2 = 1N4148
5
4
1
2
3
C2
C4
C3
V
IN
+
V
OUT = VIN
–
V
OUT = (2VIN) –
(V
FD1) – (VFD2)
TCM828
TCM829
TCM828
TCM829
GND
OUT
4
1
Figure 5. Paralleling TCM828s or TCM829s to Reduce Output Resistance
C1
5
4
3
4
1
2
1
3
C2
V
OUT
V
OUT = VIN
R
OUT =
R
OUT
OF SINGLE DEVICE
V
IN
+
NUMBER OF DEVICES
–
TCM828
TCM829
"1"
TCM828
TCM829
"n"
. . .
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