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PDF KA278RA05 Data sheet ( Hoja de datos )
| Número de pieza | KA278RA05 | |
| Descripción | Low Dropout Voltage Regulator (Fixed & Adjustable) | |
| Fabricantes | Fairchild | |
| Logotipo |  |
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KA278RA05
Low Dropout Voltage Regulator
(Fixed & Adjustable)
www.fairchildsemi.com
Features
• Nominal 5V output without adjusting
• Output Adjustable Between 1.25V and 32V
• 2A Output low dropout voltage regulator
• TO220 Full-Mold package (4PIN)
• Overcurrent protection, Thermal shutdown
• Overvoltage protection, Short-Circuit protection
Description
The KA278RA05 is a low-dropout voltage regulator suitable
for various electronic equipments. It provides constant
voltage power source with TO-220F-4 lead full mold
package. Dropout voltage of KA278RA05 is below 0.5V in
full rated current(2A). This regulator has various function
such as peak current protection, thermal shut down and over
voltage protection.
TO-220F-4L
1
1. Vin 2. VO 3. GND 4. Vadj
Internal Block Diagram
Vin 1
THERMAL SHUTDOWN
BANDGAP REFERENCE
OVERVOLTAGE
PROTECTION
-
+
SOA PROTECTION
SHSOHORRTT-CCIIRRCCUUIITT
PROTECTION
Q1
2 Vo
RRi1n 1.8kΩ
4 Vadj
Rr2ef0.6kΩ
3
GND
©2001 Fairchild Semiconductor Corporation
Rev. 1.0.2
1 page  
Typical Application
KA278RA05
Input
1 Vin
Vo 2
KA278RA05
Ci
GND
Vadj 4
3
Output
R3
Co RL
R4
R1//R3
Vo = 1.25 ( 1 + R2//R4 ) R1 = 1.8kΩ , R2 = 0.6kΩ
Figure 7. Application Circuit (Adjustable Mode)
• Ci is required if regulator is located an appreciable distance from power supply filter.
• Co improves stability and transient response.(CO > 47µF)
25
20
15
10
5
0
-5
-10
-50
-25 0
25 50 75 100 125
Junction temperature Tj(℃)
Figure 8. Internal Resistor(R1,R2) Variation vs. Temperature(Tj)
Input
1 Vin
Vo 2
KA278RA05
Ci GND Vadj 4
3
Output = 5V
Co RL
Figure 9. Application Circuit (Fixed Mode)
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet KA278RA05.PDF ] | |
Hoja de datos destacado
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