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KA278RA12C Datasheet

  • KA278RA12C

  • 2A Output Low Dropout Voltage Regulators

  • 20頁(yè)

  • FAIRCHILD

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www.fairchildsemi.com
KA278RXXC-Series
2A Output Low Dropout Voltage Regulators
Features
KA278RXXC-series (33/05/51/09/12)
鈥?2A/3.3V, 5V, 5.1V, 9V, 12V output low dropout voltage
regulator
鈥?TO-220 full-mold package (4pin)
鈥?Overcurrent protection, thermal shutdown
鈥?Overvoltage protection, short circuit protection
鈥?With output disable function
Description
The KA278RXXC is a low-dropout voltage regulator suit-
able for various electronic equipments. It provides
constant voltage power source with TO-220-4 lead full mold
package. The dropout voltage of KA278RXXC is below
0.5V in full rated current(2A). This regulator has various
functions such as a peak current protection, a thermal shut
down, an overvoltage protection .
TO-220F-4L
KA278RA05C
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Nominal 5V output without adjusting
Output adjustable between 1.25V and 32V
2A output low dropout voltage regulator
TO-220 full-mold package (4pin)
Overcurrent protection, thermal shutdown
Overvoltage protection, short circuit protection
1
1.Vin 2. Vo 3. GND 4. Vdis - KA278RXXC(33/05/51/09/12)
1.Vin 2. Vo 3. GND 4. Vadj - KA278RA05C
Internal Block Diagram
Vin
1
Q1
2
Vo
Vin
1
Q1
2 Vo
THERMAL SHUTDOWN
OVERVOLTAGE
PROTECTION
THERMAL SHUTDOWN
OVERVOLTAGE
PROTECTION
BANDGAP REFERENCE
-
+
R1
BANDGAP REFERENCE
-
+
Rin
SOA PROTECTION
HIGH / LOW
Vdis
4
-
+
OUTPUT
ON / OFF
SOA PROTECTION
4
R2
SHORTCIRCUIT
PROTECTION
Vadj
1.4V
SHORTCIRCUIT
PROTECTION
Rref
3
GND
3
GND
(KA278R33/05/51/09/12C)
(KA278RA05C)
Rev. 1.0.2
漏2005 Fairchild Semiconductor Corporation

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