TK73200 データシートの表示（PDF） - Toko America Inc
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TK73200 Datasheet PDF : 12 Pages
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TK73200
APPLICATION INFORMATION (CONT.)
CONTINUOUS CURRENT LIMIT MODE
CN
VIN
CIN
CONT
RIPK
TK73200
VCONT
EMITTER
BASE
R1
EXTERNAL
TRANSISTOR
R2
COLLECTOR
GND
CL
VOUT
µ PRO
VIN
TK73200
VCONT
VOUT
R
2
R1
The high output voltage accuracy and low dropout voltage
are maintained when the IC is turned ON/OFF by using the
control pin as illustrated above.
In the continuous current limit mode, the CPULSE pin (pin 3)
is directly connected to ground. The output current limit is
set by R according to the following equation:
IPK
ISET (mA) = 100 (mV) / RIPK (Ω)
If the continuous current limit mode is also used for output
short circuit protection, the ISET value is set 50% to 100%
more than the maximum operating current. The current
transistor is selected from the ISET value. The output
voltage drops when the output current exceeds the ISET
value. However, the output voltage returns to normal once
the output current decreases below the ISET value.
HIGH-SIDE SWITCHING
VOLTAGE
REGULATOR
VDROP
ON/OFF
CONTROL
VOUT
High-side switching should not be implemented by an
external transistor as shown above. This results in addi-
tional voltage drop and loss of accuracy.
Page 10
June 1999 TOKO, Inc.
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