Datasheet

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       

SLVS009F − JUNE 1976 − REVISED FEBRUARY 2005
7
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
V
I
V
I
R
CL
14 13 10 8
TL497A
12345
C
T
R1
R2 = 1.2 kΩ
C
O
R
CL
14 13 10 8
R1
C
T
L
V
O
L
V
O
12 3 45
DESIGN EQUATIONS
I
(PK)
+ 2I
O
max
ƪ
1 )
Ť
V
O
Ť
V
I
ƫ
L(mH) +
V
I
I
(PK)
t
on
(ms)
C
T
(pF) [ 12 t
on
(ms)
R1 +
ǒ
Ť
V
O
Ť
–1.2V
Ǔ
kW
Choose L (50 to 500 µH), calculate
t
on
(10 to 150 µs)
R
CL
+
0.5 V
I
(PK)
C
O
(mF) [ t
on
(ms)
ƪ
V
I
Ť
V
O
Ť
I
(PK)
) I
O
ƫ
V
ripple
(PK)
EXTENDED POWER CONFIGURATION
(using external transistor)
†
R2 = 1.2 kΩ
†
TL497A
C
O
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