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| www.fairchildsemi.com MC78TXX 3-Terminal 3A Positive Voltage 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 Voltage Offered in 4% Tolerance No External Components Required Output Voltage of 5,12 and 15V Description This family of fixed voltage regulators are monolithic integrated circuit capable of driving loads in excess of 3.0 A. TO-220 GND 1 1.Input 2. GND 3. Output Internal Block Diagram INPUT 1 CURRENT GENERATOR SERIES PASS ELEMENT OUTPUT 3 SOA PROTECTION STARTING CIRCUIT REFERENCE VOLTAGE ERROR AMPLIFIER THERMAL PROTECTION GND 2 Rev. 1.0.1 (c)2002 Fairchild Semiconductor Corporation MC78TXX Absolute Maximum Ratings Parameter Input Voltage (for VO = 5V to 12V) (for VO = 15V) Power Dissipation Thermal Resistance, Junction to Air (Note1, 2) Ta = +25C Thermal Resistance, Junction to Case (Note1) Tc = +25C Operating Junction Temperature Range Storage Temperature Range Note: 1. Thermal resistance test board Size: 76.2mm * 114.3mm * 1.6mm(1S0P) JEDEC standard: JESD51-3, JESD51-7 2. Assume no ambient airflow. Symbol VI PD RJA RJC TJ TSTG Value 35 40 Internally limited 65 2.5 0 ~ +125 -65 ~ +150 Unit V V C/W C/W C C Electrical Characteristics(MC78T05) (VI = 10V, IO = 3.0 A, 0C TJ +125C, Po PMAX (Note3), unless otherwise specified. ) Parameter Output Voltage Symbol Vo Conditions 5mA Io 3.0A , TJ = +25C 7.3V VI 20V, 5mA Io 2.0A 7.2V VI 35V , Io=5mA, TJ =+25C 7.2V VI 35V , Io=1.0A, TJ = +25C 7.5V VI 20V, Io =2.0A, TJ = +25C 8.0V VI 12V, Io =3.0A, TJ = +25C 5mA Io 3.0A , TJ = +25C 5mA Io 3.0A Pulse =10ms, P = 20W TA = +25C 5mA Io 3.0A , TJ = +25C 5mA Io 3.0A 7.2V VI 35V, Io = 5mA TJ = +25C ; 7.5V VI 20V, Io =2.0A ; 5mA Io 3.0A, TJ = +25C f = 120Hz, 8V VI 18V, Io = 2.0A TJ = +25C Io = 3A ,TJ = +25C TA = +25C, 10Hz f 100kHz TA = +25C f = 1.0kHz VI = 35V, TJ =+25C Io = 5.0mA Min. 4.8 4.75 Typ. 5.0 5.0 3.0 10 15 0.002 3.5 4.0 0.1 Max. 5.2 5.25 25 30 80 0.03 5.0 6.0 0.8 Unit V Line Regulation (Note4) VO mV mV mV %Vo/W mA mA mA Load Regulation (Note4) Thermal Regulation Quiescent Current VO REGT IQ - Quiescent Current Change IQ - Ripple Rejection Dropout Voltage Output Noise Voltage Peak Output Current Output Resistance Short Circuit Current Limit RR VD VN IPK Ro Isc - 75 2.2 10 5.0 2.0 1.5 0.2 2.5 2.5 - dB V V/Vo A m A mV/C Average Temperature VO/T Coefficient of Output Voltage 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 Vo due heating effects must be taken into account separately. Pulse testing with low duty is used. 2 MC78TXX Electrical Characteristics(MC78T12) (Continued) (VI = 19V, IO = 3.0 A, 0C TJ +125C, Po PMAX (Note1), unless otherwise specified. ) Parameter Output Voltage Symbol Vo Conditions 5mA Io 3.0A , TJ =+25C 14.5V VI 27V, 5mA Io 2.0A 14.5V VI 35V, Io=5mA, TJ =+25C 14.5V VI 35V, Io=1.0A, TJ =+25C 14.9V VI 28V, Io =2.0A, TJ =+25C 16V VI 22V, Io =3.0A, TJ =+25C 5mA Io 3.0A, TJ =+25C 5mA Io 3.0A Pulse =10ms, P = 20W TA = +25C 5mA Io 3.0A, TJ =+25C 5mA Io 3.0A 14.5V VI 35V, Io = 5mA TJ =+25C ; 14.9V VI 27V, Io =2.0A ; 5mA Io 3.0A, TJ =+25C f = 120Hz, 15V VI 25V, Io = 2.0A TJ =+25C Io = 3A,TJ =+25C TA =+25C, 10Hz f 100kHz TA =+25C f = 1.0kHz VI = 35V, TJ =+25C Io = 5.0mA Min. 11.5 11.4 Typ. 12 12 6.0 10 15 0.002 3.5 4.0 0.1 Max. 12.5 12.8 45 30 80 0.03 5.0 6.0 0.8 Unit V Line Regulation (Note2) VO mV mV mV %Vo/W mA mA mA Load Regulation (Note2) Thermal Regulation Quiescent Current VO REGT IQ IQ - Quiescent Current Change - Ripple Rejection Dropout Voltage Output Noise Voltage Peak Output Current Output Resistance Short Circuit Current Limit RR VD VN IPK Ro Isc - 67 2.2 10 5.0 2.0 1.5 0.5 2.5 2.5 - dB V V/Vo A m A mV/C Average Temperature VO/T Coefficient of Output Voltage 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 Vo due heating effects must be taken into account separately. Pulse testing with low duty is used. ( PMAX = 25W) 3 MC78TXX Electrical Characteristics(MC78T15) (Continued) (VI = 23V, IO = 3.0 A, 0C TJ +125C, Po PMAX (Note1), unless otherwise specified. ) Parameter Output Voltage Symbol Vo Conditions 5mA Io 3.0A, TJ =+25C 17.5V VI 30V, 5mA Io 2.0A 17.6V VI 40V, Io=5mA, TJ =+25C 17.6V VI 40V, Io=1.0A, TJ =+25C 18V VI 30V, Io =2.0A, TJ =+25C 20V VI 26V, Io =3.0A, TJ =+25C 5mA Io 3.0A, TJ =+25C 5mA Io 3.0A Pulse =10ms, P = 20W TA = +25C 5mA Io 3.0A, TJ =+25C 5mA Io 3.0A 17.6V VI 40V, Io = 5mA TJ =+25C ; 18V VI 30V, Io =2.0A ; 5mA Io 3.0A, TJ =+25C f = 120Hz, 18.5V VI 28.5V, Io = 2.0A TJ =+25C Io = 3A ,TJ = +25C TA = +25C, 10Hz f 100kHz TA = +25C f = 1.0kHz VI = 40V, TJ = +25C Io = 5.0mA Min. 14.4 14.25 Typ. 15 15 7.5 10 15 0.002 3.5 4.0 0.1 Max. 15.6 15.75 55 30 80 0.03 5.0 6.0 0.8 Unit V Line Regulation (Note2) VO mV mV mV %Vo/W mA mA mA Load Regulation (Note2) Thermal Regulation Quiescent Current VO REGT IQ IQ - Quiescent Current Change - Ripple Rejection Dropout Voltage Output Noise Voltage Peak Output Current Output Resistance Short Circuit Current Limit RR VD VN IPK Ro Isc - 65 2.2 10 5.0 2.0 1.0 0.5 2.5 2.0 - dB V V/Vo A m A mV/C Average Temperature VO/T Coefficient of Output Voltage 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 Vo due heating effects must be taken into account separately. Pulse testing with low duty is used. ( PMAX = 25W) 4 MC78TXX Typical Application INPUT 1 KA78TXX MC78TXX 2 3 OUTPUT 0.33 F 0. 1 F Note: 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 MC78TXX Mechanical Dimensions Package Dimensions in millimeters TO-220 9.90 0.20 4.50 0.20 1.30 0.10 2.80 0.10 (8.70) o3.60 0.10 (1.70) 1.30 -0.05 +0.10 9.20 0.20 (1.46) 13.08 0.20 (1.00) (3.00) 15.90 0.20 1.27 0.10 1.52 0.10 0.80 0.10 2.54TYP [2.54 0.20] 2.54TYP [2.54 0.20] 10.08 0.30 18.95MAX. (3.70) (45 ) 0.50 -0.05 +0.10 2.40 0.20 10.00 0.20 6 MC78TXX Ordering Information Product Number MC78T05CT MC78T12CT MC78T15CT TO-220 0 ~ +125C Package Operating Temperature 7 MC78TXX 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 11/12/02 0.0m 001 Stock#DSxxxxxxxx 2002 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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