TK73200 Ver la hoja de datos (PDF) - Toko America Inc
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TK73200 Datasheet PDF : 12 Pages
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TK73200
APPLICATION INFORMATION (CONT.)
EXTERNAL PNP POWER TRANSISTOR
This IC can use any kind of external transistor. The external transistor selection is a function of the load current, Hfe and
power dissipation. See following chart:
LOAD CURRENT
RECOMMENDED EXTERNAL TRANSISTOR
0 ~ 180 mA
2SB624, 2SB1115, 2SB799 (NEC), 2SB970 (Matsushita)
0 ~ 300 mA
2SB1115, 2SB799 (NEC)
0 ~ 500 mA
2SB1114, 2SB1115 (NEC), 2SB1302 (Sanyo), 2SA1203,
2SA1213, 2SA1734 (Toshiba)
0~1A
2SA1242, 2SA1736 (Toshiba), 2SB1302, 2SA1896 (Sanyo)
0~2A
2SA1451, 2SA1242 (Toshiba)
0~3A
2SA1451 (Toshiba), 2SA1645 (NEC)
0~4A
2SA1451 (Toshiba), 2SB904 (Sanyo), 2SA1645 (NEC)
RECOMMENDED RIPK (Ω)
0.33 ~ 0.39
0.22 ~ 0.27
0.12 ~ 0.15
0.056 ~ 0.068
0.033 ~ 0.039
0.022 ~ 0.027
0.012 ~ 0.015
VOLTAGE BACKUP OPERATION (HOLDUP TIME)
PARALLEL ON/OFF CONTROL OPERATION
VOLTAGE
DETECTOR
IC
VIN
73200
VCONT OFF
VOUT
µ PRO
R
2
CL
RESET
R1
VIN
TK73200
TK11230B
R
TK11220B
5V
5A
R
2
R1
3V
100 mA
2V
100 mA
CL becomes the backup power supply when the
microprocessor is reset with the voltage detector IC
simultaneously with turning OFF the TK73200. CL provides
the holdup time necessary to do an orderly shutdown of the
microprocessor.
ON/OFF
CONTROL
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.
June 1999 TOKO, Inc.
Page 11
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