TK113xxBM/U
DEFINITION AND EXPLANATION OF TECHNICAL TERMS (CONT.)
Reverse Voltage Protection
Reverse voltage protection prevents damage due to the
output voltage being higher than the input voltage. This
fault condition can occur when the output capacitor remains
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 CURRENT
50
40 VOUT
ICONT (µA)
VIN
If the control function is not used, connect the control
terminal to V
IN
. When the control function is used, the
control current can be reduced by inserting a series
resistor (R
CONT
) between the control terminal and V
IN
. The
value of this resistor should be determined from the graph
below.
CONTROL PIN CURRENT
VS.
VOLTAGE
RCONT = 0
30
20
10
SW
RC
CN
0
0
1
2
RCONT =100K
3
4
5
VCONT (V)
Note: V
CONT
= differential voltage from V
IN
pin to V
CONT
pin.
SOT23L
The requirement for the pullup resistor (R
PULLUP
) is deter-
mined by the external control circuitry. For example, open
collector/open drain logic may require R
PULLUP
over tem-
perature; CMOS logic will not require R
PULLUP
.
VIN
CN
RC
SW
SOT89
Page 10
April 2000 TOKO, Inc.
TOKO [ TOKO, INC ]
