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TC7662BEPA 데이터시트(PDF) 7 Page - Microchip Technology

부품명 TC7662BEPA
상세설명  CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER
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제조업체  MICROCHIP [Microchip Technology]
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TC7662BEPA 데이터시트(HTML) 7 Page - Microchip Technology

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TC7662B
CHARGE PUMP DC-TO-DC
VOLTAGE CONVERTER
TC7662B-8 9/11/96
© 2001 Microchip Technology Inc.
DS21469A
1
2
3
4
8
7
6
5
TC7662B
1
µF
+
+
1
µF
+5 LOGIC SUPPLY
TTL DATA
INPUT
RS232
DATA
OUTPUT
11
3
12
16
4
15
13
14
1
IH5142
+5V
-5V
Figure 13. RS232 Levels from a Single 5V Supply
Regulated Negative Voltage Supply
In some cases, the output impedance of the TC7662B
can be a problem, particularly if the load current varies
substantially. The circuit of Figure 12 can be used to over-
come this by controlling the input voltage, via an ICL7611
low-power CMOS op amp, in such a way as to maintain a
nearly constant output voltage. Direct feedback is advisable,
since the TC7662B’s output does not respond instanta-
neously to change in input, but only after the switching delay.
The circuit shown supplies enough delay to accommodate
the TC7662B, while maintaining adequate feedback. An
increase in pump and storage capacitors is desirable, and
the values shown provide an output impedance of less than
5
Ω to a load of 10mA.
1
2
3
4
8
7
6
5
TC7662B
100
µF
+
V+
100
µF
VOUT
-
50k
100k
+8V
50k
10
µF
+
800k
250K
VOLTAGE
ADJUST
+8V
56k
+
Figure 12. Regulating the Output Voltage


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