CURRENT BOOST
APPLICATION INFORMATION (CONT.)
VIN
1 µF
VOUT
+
RE
CL
10 µF
TK11900
NOISE BYPASS
CONTROL
CN
0.1 µF
CONT
R1
Note: VOUT = 1.25 [(R1 + R2) / R2]
10 k - R2 - 60 k
FEEDBACK
R2
The output current can be increased by connecting an external NPN transistor as shown above.
The output current capability depends on the H of the external transistor.
fe
Note: The TK11900 internal short circuit protection and the thermal sensor do not protect the external transistor.
November 2000 TOKO, Inc.
Page 9