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TC1240ECH bảng dữ liệu(PDF) 9 Page - Microchip Technology

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Giải thích chi tiết về linh kiện  Positive Doubling Charge Pumps with Shutdown in a SOT-23 Package
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 2001-2012 Microchip Technology Inc.
DS21516D-page 9
TC1240/TC1240A
5.4
Input Supply Bypassing
The VIN input should be capacitively bypassed to
reduce AC impedance and minimize noise effects due
to
the
switching
internal
to
the
device.
The
recommended capacitor should be a large value (at
least equal to C1) connected from the input to GND.
5.5
Shutdown Input
The TC1240 and TC1240A are disabled when SHDN is
high, and enabled when SHDN is low. This input cannot
be allowed to float.
FIGURE 5-3:
Test Circuit.
5.6
Voltage Doubler
The most common application for charge pump
devices is the doubler (Figure 5-3). This application
uses two external capacitors – C1 and C2 (plus a power
supply bypass capacitor, if necessary). The output is
equal to 2 x VIN minus any voltage drops due to
loading. Refer to Table 5-1 and Table 5-2 for capacitor
selection.
3
1
2
4
5
C3
C1
C2
VIN
VOUT
RL
TC1240
TC1240A
C-
VIN
OUT
C+
GND
SHDN
6
+
+
+
Device
C1
C2
C3
TC1240
TC1240A
3.3 µF
3.3 µF
3.3 µF


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