Datasheet
SLVS009F − JUNE 1976 − REVISED FEBRUARY 2005
8
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
3-Term
Reg < 12 V
Switching
Circuit
Control
14 13
TL497A
5
V
O
V
I
V
I
V
O
R2
1 kΩ
R1
Q2
10 mA
R
CL
V
reg
14 13
5
TL497A
CURRENT LIMIT FOR EXTENDED INPUT CONFIGURATION
Q1
R
CL
+
V
BE(Q1)
I
limit (PK)
R1 )
V
I
I
B(Q2)
R2 +
ǒ
V
reg
* 1
Ǔ
10 kW
Control
DESIGN EQUATIONS
Switching
Circuit
EXTENDED INPUT CONFIGURATION WITHOUT CURRENT LIMIT
3-Term
Reg < 12 V
Figure 4. Extended Input Voltage Range (V
I
> 12 V)