KA78TXX. 3-Terminal 3A Positive Voltage Regulator. Features. Description. Internal Block Diagram.

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1 3Terminal 3A Positive oltage Regulator Features Output Current in Excess of 3.0A Output Transistor Safe Operating Area Compensation Power Dissipation: 25W Internal Short Circuit Current Limiting Internal Thermal Overload Protection Output oltage Offered in 4% Tolerance No External Components Required Output oltage of 5, 12 and Description This family of fixed voltage regulators are monolithic integrated circuit capable of driving loads in excess of 3.0A. TO220 1 GND 1.Input 2. GND 3. Output Internal Block Diagram INPUT 1 SERIES PASS ELEMENT OUTPUT 3 CURRENT GENERATOR SOA PROTECTION STARTING CIRCUIT REFERENCE OLTAGE ERROR AMPLIFIER THERMAL PROTECTION GND 2 Rev Fairchild Semiconductor Corporation

2 Absolute Maximum Ratings Parameter Symbol alue Unit Input oltage (for O = 5 to 12) (for O = ) Power Dissipation PD Internally limited Thermal Resistance, Junction to Air (Note1, 2) Ta = +25 C RθJA 65 C/W Thermal Resistance, Junction to Case (Note1) Tc = +25 C RθJC 2.5 C/W Operating Junction Temperature Range TJ 0 ~ +125 C Storage Temperature Range TSTG 65 ~ +0 C Note: 1. Thermal resistance test board Size: 76.2mm * 114.3mm * 1.6mm(1S0P) JEDEC standard: JESD513, JESD Assume no ambient airflow. Electrical Characteristics(KA78T05) (I = 10, IO = 3.0 A, 0 C TJ +125 C, Po PMAX (Note3), unless otherwise specified.) Parameter Symbol Conditions Min. Typ. Max. Unit Output oltage Line Regulation (Note4) Load Regulation (Note4) Thermal Regulation Quiescent Current Quiescent Current Change o REGT IQ IQ Note: 3. Although power dissipation is internally limited, specifications apply only for PO Pmax, Pmax = 25W 4. Load and line regulation are specified at constant junction temperature. Change in o due heating effects must be taken into account separately. Pulse testing with low duty is used. I, TJ = +25 C 7.3 I 20, 5 Io 2.0A 7.2 I 35, Io=5, TJ = +25 C 7.2 I 35, Io=1.0A, TJ = +25 C 7.5 I 20, Io =2.0A, TJ = +25 C 8.0 I 12, Io =3.0A, TJ = +25 C, TJ = +25 C Pulse =10ms, P = 20W TA = +25 C, TJ = +25 C 7.2 I 35, Io = 5 TJ = +25 C ; 7.5 I 20, Io =2.0A ;, TJ = +25 C %o/w Ripple Rejection RR f = 120Hz, 8 I 18, Io = 2.0A TJ = +25 C 75 db Dropout oltage D Io = 3A,TJ = +25 C Output Noise oltage N TA = +25 C, 10Hz f 100kHz 10 µ/o Peak Output Current IPK TA = +25 C A Output Resistance Ro f = 1.0kHz 2.0 mω Short Circuit Current Limit Isc I = 35, TJ =+25 C A Average Temperature Coefficient of Output oltage / T Io = 0.2 / C 2

3 Electrical Characteristics(KA78T12) (Continued) (I = 19, IO = 3.0 A, 0 C TJ +125 C, Po PMAX (Note1), unless otherwise specified.) Parameter Symbol Conditions Min. Typ. Max. Unit Output oltage Line Regulation (Note2) Load Regulation (Note2) Thermal Regulation Quiescent Current Quiescent Current Change o REGT IQ IQ 14.5 I 27, 5 Io 2.0A 14.5 I 35, Io=5, TJ =+25 C 14.5 I 35, Io=1.0A, TJ =+25 C 14.9 I 28, Io =2.0A, TJ =+25 C 16 I 22, Io =3.0A, TJ =+25 C Pulse =10ms, P = 20W TA = +25 C 14.5 I 35, Io = 5 TJ =+25 C ; 14.9 I 27, Io =2.0A %o/w Ripple Rejection RR f = 120Hz, I 25, Io = 2.0A TJ =+25 C 67 db Dropout oltage D Io = 3A,TJ =+25 C Output Noise oltage N TA =+25 C, 10Hz f 100kHz 10 µ/o Peak Output Current IPK TA =+25 C A Output Resistance Ro f = 1.0kHz 2.0 mω Short Circuit Current Limit Isc I = 35, TJ =+25 C A Average Temperature Coefficient of Output oltage / T Io = 0.5 / C Note: 1. Although power dissipation is internally limited, specifications apply only for PO Pmax, Pmax = 25W 2. Load and line regulation are specified at constant junction temperature. Change in o due heating effects must be taken into account separately. Pulse testing with low duty is used. ( PMAX = 25W) 3

4 Electrical Characteristics(KA78T) (Continued) (I = 23, IO = 3.0A, 0 C TJ +125 C, Po PMAX (Note1), unless otherwise specified.) Parameter Symbol Conditions Min. Typ. Max. Unit Output oltage Line Regulation (Note2) Load Regulation (Note2) Thermal Regulation Quiescent Current Quiescent Current Change o REGT IQ IQ 17.5 I 30, 5 Io 2.0A 17.6 I 40, Io=5, TJ =+25 C 17.6 I 40, Io=1.0A, TJ =+25 C 18 I 30, Io =2.0A, TJ =+25 C 20 I 26, Io =3.0A, TJ =+25 C Pulse =10ms, P = 20W TA = +25 C 17.6 I 40, Io = 5 TJ =+25 C ; 18 I 30, Io =2.0A ; %o/ W Ripple Rejection RR f = 120Hz, 18.5 I 28.5, Io = 2.0A TJ =+25 C 65 db Dropout oltage D Io = 3A,TJ =+25 C Output Noise oltage N TA =+25 C, 10Hz f 100kHz 10 µ/o Peak Output Current IPK TA =+25 C A Output Resistance Ro f = 1.0kHz 2.0 mω Short Circuit Current Limit Isc I = 40, TJ =+25 C A Average Temperature Coefficient of Output oltage / T Io = 0.5 / C Note: 1. Although power dissipation is internally limited, specifications apply only for PO Pmax, Pmax = 25W 2. Load and line regulation are specified at constant junction temperature. Change in o due heating effects must be taken into account separately. Pulse testing with low duty is used. ( PMAX = 25W) 4

5 Typical Application INPUT 1 KA78TXX 3 OUTPUT µf 0. 1µF Notes: 1. To specify an output voltage, substitute voltage value for XX. 2. Bypass Capacitors are recommend for optimum stability and transient response and should be located as close as possible to the regulator 5

6 Mechanical Dimensions Package Dimensions in millimeters TO ± ±0.20 (1.70) 1.30 ±0.10 (8.70) ø3.60 ± ± ± ±0.20 (1.46) (1.00) 1.27 ±0.10 (45 ) (3.00) (3.70).90 ± ± ± MAX. 2.54TYP [2.54 ±0.20] 0.80 ± TYP [2.54 ±0.20] ± ±0.20 6

7 Ordering Information Product Number Package Operating Temperature KA78T05 KA78T12 TO220 0 ~ +125 C KA78T 7

8 DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROE 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 CONEY 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 DEICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROAL 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. 11/12/02 0.0m 001 Stock#DSxxxxxxxx 2002 Fairchild Semiconductor Corporation

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