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参数资料
| 型号： | TC1219ECHRT |
| 元件分类： | 稳压器 |
| 英文描述： | 0.05 A SWITCHED CAPACITOR CONVERTER, 20 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封装： | SOT-23A, 6 PIN |
| 文件页数： | 5/8页 |
| 文件大小： | 85K |
| 代理商： | TC1219ECHRT |
5
TC1219/1220-3 8/20/99
TC1219
TC1220
SWITCHED CAPACITOR VOLTAGE
CONVERTERSWITH SHUTDOWN
IN SOT PACKAGES
Voltage Doubler/Inverter
Another common application of the TC1219/1220 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
40 mA.
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.
Figure 5. Paralleling Multiple Devices to Reduce Output Resistance
C1
6
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
TC1219
TC1220"1"
TC1219
TC1220
"n"
. . .
SHDN
Shutdown
Control
5
6
V
IN
Figure 6. Combined Doubler and Inverter
C1
D1
D2
D1, D2 = 1N4148
6
4
1
2
3
C2
C4
C3
V
IN
V
OUT = –VIN
V
OUT = (2VIN) –
(V
FD1) – (VFD2)
TC1219
TC1220
Shutdown
Control
5
Figure 7. High V– Load Current
TC1219
TC1220
GND
OUT
4
1
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.
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相关代理商/技术参数 |
参数描述 |
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