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TL497AIDR Datasheet(PDF) 7 Page - Texas Instruments

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Part # TL497AIDR
Description  500-mA PEAK STEP-UP, STEP-DOWN, INVERTING SWITCHING VOLTAGE REGULATOR
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TL497AIDR Datasheet(HTML) 7 Page - Texas Instruments

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TL497A
500mA PEAK STEPUP, STEPDOWN, INVERTING SWITCHING VOLTAGE REGULATOR
SLVS009F − JUNE 1976 − REVISED FEBRUARY 2005
7
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
VI
VI
RCL
14 13
10
8
TL497A
12
3
4
5
CT
R1
R2 = 1.2 k
CO
RCL
14
13
10
8
R1
CT
L
VO
L
VO
12
3
4
5
DESIGN EQUATIONS
I
(PK) +
2I
O
max 1
)
V
O
V
I
L(
mH) +
V
I
I
(PK)
ton(ms)
C
T
(pF)
[ 12 ton(ms)
R1
+
V
O
–1.2 V k
W
Choose L (50 to 500
µH), calculate
ton (10 to 150 µs)
R
CL +
0.5 V
I
(PK)
C
O
(
mF) [ ton(ms)
V
I
V
O
I
(PK) )
I
O
V
ripple
(PK)
EXTENDED POWER CONFIGURATION
(using external transistor)
R2 = 1.2 k
TL497A
CO
BASIC CONFIGURATION
(Peak Switching Current = I(PK) < 500 mA)
† Use external catch diode, e.g., 1N4001, when building an inverting supply with the TL497A.
Figure 3. Inverting Applications


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