TK73246MCL Просмотр технического описания (PDF) - Toko America Inc
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TK73246MCL Datasheet PDF : 16 Pages
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TK732xx
APPLICATION INFORMATION (CONT.)
VOLTAGE BACKUP OPERATION (HOLDUP TIME)
OUTPUT VOLTAGE ADJUST
VOLTAGE
DETECTOR
IC
VIN
732xx
VCONT OFF
VOUT
µ PRO
RESET
CL
VIN
VCONT
RADJ
TK732xx
1000 pF
VSENSE
VOUT
VCONT
CL becomes the backup power supply when the
microprocessor is reset with the voltage detector IC
simultaneously with turning OFF the TK732xx. CL provides
the holdup time necessary to do an orderly shutdown of the
microprocessor.
PARALLEL ON/OFF CONTROL OPERATION
When a highly accurate output voltage is necessary, the
output can be adjusted. As shown above, higher output
resolution can be achieved by putting a resistor (RADJ) in
the VSENSE pin in parallel with a 1000 pF capacitor. A value
of 2 K provides an adjustment of 50 mV typically. Note:
using this technique, the output voltage can only be
adjusted higher.
BATTERY CHARGER
VIN
R
ON/OFF
CONTROL
TK732xx
TK11230B
TK11220B
5V
5A
3V
100 mA
2V
100 mA
The figure above illustrates multiple regulators being
controlled by a single ON/OFF control signal. The series
resistor R is put in the input line of the low output voltage
regulator in order to prevent overdissipation. The voltage
dropped across the resistor reduces the large input-to-
output voltage across the regulator, reducing the power
dissipation in the device.
VIN
RIPK
CURRENT
LIMIT
SENSING
CONT
TK732XX
EMITTER
BASE
EXTERNAL
TRANSISTOR
VADJ
REMOTE
SENSING
COLLECTOR
VOUT
CL
LOAD
CONT
VOLTAGE DETECTOR
CIRCUIT
OR
MICROPROCESSOR
VSENSE
Continuous Current Limit Mode:
ISET (mA) = 100 (mV) / RIPK (Ω)
Page 14
January 1999 TOKO, Inc.
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