KA378R12 FAIRCHILD | Alldatasheet
Document overview
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- PDF pages: 8
Technical content
Features
- 3A/12V Output Low Dropout V oltage Regulator
- TO-220 Full-Mold Package (4Pin)
- Overcurrent Protection, Thermal Shutdown
- Overvoltage Protection, Short Circuit Protection
- With Output Disable Function
Description
The KA378R12 is a low-dropout voltage regulator suitable for various electronic equipments. It provide constant voltage power source with TO-220 4 lead full mold package. Dropout voltage of KA378R12 is below 0.5V in full rated current(3A). This regulator has various function such as peak current protection, thermal shut down, overvoltage protection and output disable function. TO-220F-4L 1. Vin 2. Vo 3. GND 4. Vdis Internal Block Diagram THERMAL SHUTDOWN BANDGAP REFERENCE OVERVOLTAGE PROTECTION SOA PROTECTION SHORTCIRCUIT PROTECTION 2Vin Vdis Vo GND HIGH / LOW OUTPUT ON / OFF 1.4V SHORT-CIRCUIT KA378R12 Low Dropout Voltage Regulator
Electrical Characteristics
(Vin = 15V, Io = 1.5A, Ta = 25°C, unless otherwise specified) Note: 1.These parameters, although guaranteed, are not 100% tested in production. 2. Junction -to-case thermal resistance test environments. -.Pneumatic heat sink fixture. -.Clamping pressure 60psi through 12mm diameter cylinder. -.Thermal grease applied between PKG and heat sink fixture Parameter Symbol Value Unit Remark Input Voltage Vin 35 V - Disable Voltage Vdis 35 V - Output Current Io 3.0 A - Power Dissipation 1 Pd1 1.5 W No Heatsink Power Dissipation 2 Pd2 15 W With Heatsink Junction Temperature Tj 150 °C- Operating Temperature Topr -20 ~ 80 °C- Thermal Resistance, Junction-to Case(Note2) R θjc 2.9 °C/W - Thermal Shutdown Temperature Ttsd 150 °C- Storage Temperature T stg -65 ~ 150 °C- Parameter Symbol Conditions Min. Typ. Max. Unit Output Voltage Vo - 11.7 12.0 12.3 V Load Regulation Rload 5mA < Io < 3A - 0.1 2.0 % Line Regulation Rline 13V < Vin < 29V - 0.5 2.5 % Ripple Rejection Ratio RR Note1 45 55 - dB Dropout Voltage Vdrop Io = 3A - - 0.5 V Disable Voltage High VdisH Output Active 2.0 - - V Disable Voltage Low VdisL Output Disabled - - 0.8 V Disable Bias Current High IdisH Vdis = 2.7V - - 20 µA Disable Bias Current Low IdisL Vdis = 0.4V - - -0.4 mA Quiescent Current Iq Io = 0A - - 10 mA
Figure 1. Application Circuit
- Ci is required if regulator is located an appreciable distance from power supply filter.
- Co improves stability and transient response.(Co > 47 µF) 1 2 Vin Vdis Vo GND Disable Signal Ci Co RL
2.80 ±0.20 1.50 ±0.20 0.60 ±0.10 3-1.05MIN 3-1.30MAX (5.00) (1.00) (45 (1.00) (1.19) (7.62) 1.25MIN 1.50MAX (1.19) ø3.20 ±0.20 6.50 ±0.20 15.70 ±0.20(13.60) (3.30) 10.30 ±0.30 2.54TYP [2.54 ±0.25] 0.50+0.10 –0.05 TO-220F-4L
Ordering Information
Product Number Package Operating Temperature KA378R12 TO-220F-4L -20 °C to +80°C
3/16/05 0.0m 001 Stock#DSxxxxxxxx 2005 Fairchild Semiconductor Corporation LIFE SUPPORT POLICY FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. 2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.