TK112xxB
DEFINITION AND EXPLANATION OF TECHNICAL TERMS (CONT.)
Reverse Voltage Protection
If the control function is not used, connect the control
terminal to VIN. When the control function is used, the
control current can be reduced by inserting a series
resistor (RCONT) between the control terminal and VIN. The
value of this resistor should be determined from the graph
below.
Reverse voltage protection prevents damage due to the
output voltage being higher than the input voltage. This
faultconditioncanoccurwhentheoutputcapacitorremains
charged and the input is reduced to zero, or when an
external voltage higher than the input voltage is applied to
the output side.
CONTROL FUNCTION
CONTROL PIN CURRENT VS.
VOLTAGE
50
V
IN
V
OUT
40
30
20
SW
R
C
R
= 0
CONT
C
10
N
R
=100K
4
CONT
0
0
1
2
3
5
V
(V)
CONT
SOT-23L
V
IN
SW
R
C
C
N
SOT-89
Page 14
October 1999 TOKO, Inc.
TOKO [ TOKO, INC ]
