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| www..com www.fairchildsemi.com KA378R12 Low Dropout Voltage Regulator Features * * * * * 3A/12V Output Low Dropout Voltage 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 1. Vin 2. Vo 3. GND 4. Vdis Internal Block Diagram Q1 Vin 1 2 Vo THERMAL SHUTDOWN OVERVOLTAGE PROTECTION BANDGAP REFERENCE + R1 HIGH / LOW Vdis 4 + SOA PROTECTION OUTPUT ON / OFF R2 1.4V SHORT-CIRCUIT SHORTCIRCUIT PROTECTION 3 GND Rev. 1.0.3 (c)2005 Fairchild Semiconductor Corporation KA378R12 www..com Absolute Maximum Ratings Parameter Input Voltage Disable Voltage Output Current Power Dissipation 1 Power Dissipation 2 Junction Temperature Operating Temperature Thermal Resistance, Junction-to Case(Note2) Thermal Shutdown Temperature Storage Temperature Symbol Vin Vdis Io Pd1 Pd2 Tj Topr Rjc Ttsd Tstg Value 35 35 3.0 1.5 15 150 -20 ~ 80 2.9 150 -65 ~ 150 Unit V V A W W C C C/W C C Remark No Heatsink With Heatsink - Electrical Characteristics (Vin = 15V, Io = 1.5A, Ta = 25C, unless otherwise specified) Parameter Output Voltage Load Regulation Line Regulation Ripple Rejection Ratio Dropout Voltage Disable Voltage High Disable Voltage Low Disable Bias Current High Disable Bias Current Low Quiescent Current Symbol Vo Rload Rline RR Vdrop VdisH VdisL IdisH IdisL Iq 5mA < Io < 3A 13V < Vin < 29V Note1 Io = 3A Output Active Output Disabled Vdis = 2.7V Vdis = 0.4V Io = 0A Conditions Min. 11.7 45 2.0 Typ. 12.0 0.1 0.5 55 Max. 12.3 2.0 2.5 0.5 0.8 20 -0.4 10 Unit V % % dB V V V A mA mA 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 2 KA378R12 www..com Typical Performance Characteristics 17.5 15.0 12.5 RL= 100 80 Quiescent current Iq(mA) Output voltage Vo(V) 8 10.0 7.5 5.0 2.5 0 0 5 10 15 20 25 RL=4 60 40 RL= 0 0 5 10 15 8 20 20 25 Input voltage Vin (V) Input voltage Vin (V) Figure 1. Output Voltage vs. Input Voltage Figure 2. Quiescent Current vs. Input Voltage 17.5 15.0 12.06 12.04 Output voltage Vo(V) 10.0 7.5 5.0 2.5 0 0 0.5 1 1.5 2 2.5 3 Output voltage Vo(V) 12.5 12.02 12.00 11.98 11.96 11.94 11.92 -25 0 25 50 75 100 125 Disable voltage Vdis (V) Temperature Tj(oC) Figure 3. Output Voltage vs. Disable Voltage Figure 4. Output Voltage vs. Temperature(Tj) 10 0.6 Dropout voltage Vdrop(V) 8 0.5 0.4 Io=3A 0.3 2.0A 0.2 0.1 0.5A 0 -25 1.0A Quiescent current Iq(mA) 6 4 2 0 -25 0 Junction temperature Tj(oC) 25 50 75 100 125 0 Junction temperature Tj(oC) 25 50 75 100 125 Figure 5. Quiescent Current vs. Temperature(Tj) Figure 6. Dropout Voltage vs. Junction Temperature 3 KA378R12 www..com Typical Performance Characteristics (Continued) 20 100 Power dissipation PD(W) 15 Relative output voltage(%) 80 60 10 40 5 20 0 -25 0 0 Temperature Ta(oC) 25 50 75 100 125 0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 Output Current(A) Figure 7. Power Dissipation vs. Temperature(Ta) Figure 8. Overcurrent Protection Characteristics (Typical value) 70 60 45 Output Voltage Deviation (mV) Input Voltage (V) Tj = 25 oC VIN = 14V IO = 1.5A VIN = 0.5Vrms 0.1 1 10 100 30 15 0 Ripple Rejection RR (dB) 50 40 30 20 10 0 -15 -30 14 13 0 5 15 25 35 45 Input Ripple Frequency (KHz) Time (s) Figure 9. Ripple Rejection vs. Input Ripple Frequency Figure 10. Line Transient Response Output Current (A) 3.0 2.5 2.0 1.5 1.0 0.5 0.0 -0.5 -1.0 -1.5 -2.0 -2.5 3.0 Output Voltage Deviation (V) 0 0 10 20 30 40 Time (s) Figure 11. Load Transient Response 4 KA378R12 www..com Typical Application Vin 1 + Vo 2 + Ci 3 GND 4 Vdis Disable Signal Co RL 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 > 47F) 5 KA378R12 www..com Mechanical Dimensions Package Dimensions in millimeters TO-220F-4L 10.00 0.20 3.40 0.10 (5.00) o3.20 0.20 4.50 0.20 2.80 0.20 (1.00) 6.50 0.20 (45 ) 15.60 0.20 15.70 0.20 (3.30) 1.25MIN 1.50MAX 0.60 0.10 2.54TYP [2.54 0.25] (13.60) 3-1.05MIN 3-1.30MAX (1.00) 10.30 0.30 1.50 0.20 0.50 -0.05 +0.10 (1.19) (7.62) (1.19) 6 KA378R12 www..com Ordering Information Product Number KA378R12 Package TO-220F-4L Operating Temperature -20C to +80C 7 KA378R12 www..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. 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. www.fairchildsemi.com 3/16/05 0.0m 001 Stock#DSxxxxxxxx 2005 Fairchild Semiconductor Corporation 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. |
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