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| UTC78XX 3 TERMINAL 1A POSITIVE VOLTAGE REGULATORS DESCRIPTION LI NEAR I NTEGRATED CI RCUI T The UTC78XX series o three-terminal positive regulators are available in TO-220 package and with several fixed output voltage, making them useful in a wide range of application. Each type employs internal current limiting, thermal shut-down and safe area protection, making it essentially indestructible. If adequate heat sinking is provided ,they can deliver over 1A output current, Although designed as fixed voltage regulators, these devices can be used with external components to obtain adjustable voltage and currents. 1 TO-220 1:INPUT; 2:GND; 3:OUTPUT FEATURES *Output current up to 1A *5V;6V;8V;9V;10V;12V;15V;18V;24V output voltage available *Thermal overload protection *Short circuit protection *Output transistor SOA protection BLOCK DIAGRAM 1 Input 3 Output 2 GND ABSOLUTE MAXIMUM RATINGS(Ta=25C) Characteristic Input voltage (for Vo=5V to 18V) (forVo=24V) Thermal resistance junction-air Thermal resistance junction-cases Operating Temperature Storage Temperature Symbol Vi R JA R(c)JC Topr Tstg Value 35 40 65 5 0~ +125 -65 ~ +150 Unit V V C/W C/W C C www..com YOUW ANG ELECTRONI CO. CS LTD 1 UTC78XX LI NEAR I NTEGRATED CI RCUI T UTC7805 ELECTRICAL CHARACTERISTICS (Refer to test circuits,0 UTC7806 ELECTRICAL CHARACTERISTICS (Refer to test circuits,0 -0.8 45 75 2 19 250 2.2 www..com YOUW ANG ELECTRONI CO. CS LTD 2 UTC78XX LI NEAR I NTEGRATED CI RCUI T UTC7808 ELECTRICAL CHARACTERISTICS (Refer to test circuits,0 dB V m mA A 56 UTC7809 ELECTRICAL CHARACTERISTICS (Refer to test circuits,0 -1 58 71 2 15 250 2.2 www..com YOUW ANG ELECTRONI CO. CS LTD 3 UTC78XX LI NEAR I NTEGRATED CI RCUI T UTC7810 ELECTRICAL CHARACTERISTICS (Refer to test circuits,0 -1 58 71 2 17 250 2.2 UTC7812 ELECTRICAL CHARACTERISTICS (Refer to test circuits,0 -1 76 71 2 18 230 2.2 www..com YOUW ANG ELECTRONI CO. CS LTD 4 UTC78XX LI NEAR I NTEGRATED CI RCUI T UTC7815 ELECTRICAL CHARACTERISTICS (Refer to test circuits,0 -1 90 70 2 19 250 2.2 UTC7818 ELECTRICAL CHARACTERISTICS (Refer to test circuits,0 -1 110 69 2 22 250 2.2 www..com YOUW ANG ELECTRONI CO. CS LTD 5 UTC78XX LI NEAR I NTEGRATED CI RCUI T UTC7824 ELECTRICAL CHARACTERISTICS (Refer to test circuits,0 -1.5 160 67 2 28 230 2.2 TEST CIRCUITS Vi C1 0.33F 1 UTC78XX 2 3 Vo C0 0.1F Vi 1 UTC78XX 2 3 RL TIP31 100 Vo 270pF 0.33F 30s FIG.1 DC PARAMETERS FIG.2 LOAD REGULATION Vi 5.1 1 UTC78XX 3 0.33F 2 RL Vo 470F 120Hz FIG.3 RIPPLE REJECTION www..com YOUW ANG ELECTRONI CO. CS LTD 6 UTC78XX APPLICATION CIRCUITS Vi C1 0.33F Vo C0 0.1F LI NEAR I NTEGRATED CI RCUI T Vi Vo Vxx 1 UTC78XX 3 2 1 UTC78XX 2 IQ 3 R1 0.33F 0.1F Io= Vxx +IQ R1 RL Io Fig.4 Fixed output regulator Vi Fig.5 Constant current regulator Vo Vxx Vi 1 UTC78XX 2 IQ 3 R1 1 UTC7805 2 3 Vo 0.33F 0.1F 0.33F Q IR1>=5*I 0.1F UTC741 10k R2 Vo=Vxx*(1+R2/R1)+ Q*R2 I Fig.6 Circuit for increasing Regulator output voltage Vi Vi Q1 BD536 IQ1 R1 30 R1 30 3 Vo IO 0.1F Fig.7 Adjustable output Rsc Q1 BD536 1 Q2 TIP42 0.33F UTC78XX 2 3 Vo 1 IREG UTC78XX 2 0.1F 0.33F Rsc=VBE / Isc Q2 Io=I EG R *(IREG -VBEQ1/R1) Q1 -IQ1*Q1 R1=VBE /IREQ Fig.8 High current with voltage regulator Vi 0.33F GND UTC741 4.7k -Vin TIP42 -Vo Fig.9 High output curent short circuit protection Vo 20V 1 UTC78XX 2 3 4.7k 1 UTC7815 2 0.33F 2.2F 3 +15V 0.1F GND 0.1F 1N4001 1N4001 1 1F 3 -20V 2 UTC7915 -15V Fig.10 Tracking voltage regulator Fig.11 Split power supply(15V,1A) www..com YOUW ANG ELECTRONI CO. CS LTD 7 UTC78XX Vo LI NEAR I NTEGRATED CI RCUI T Vi D45H11 4.7 470 1mH Vo 2 0.1F 3 10F 1 UTC78XX 1 Z1 0.5 UTC78XX 2 3 2000F Fig.12 Negative output voltage ciruit Fig.13 switching regulator TYPICAL PERFORMANCE CHARACTERISTICS Fig.14 Quiescent current 6.00 1.01 Vi=10V Vo=5V Io=5mA Fig.15 Output voltage Normailized output voltage (V) 5.75 Quiescent current (mA) Vi-Vo=5V Io=5mA 1.00 5.50 5.25 5.00 4.75 0.99 0.98 -50 -25 0 25 50 75 100 125 -50 -25 0 25 50 75 100 125 Junction temperature (k) Junction temperature (k) Fig.16 Peak output current 3.0 2.5 Tj=25k Vo=100mV 7 6.5 Fig.17 Quiescent current Tj=25k Vo=5V Io=10mA Output current (A) 2.0 Quiescent current (mA) 0 5 10 15 20 25 30 35 6. 1.5 5.5 1.0 0.5 0 5 4.5 4 0 5 10 15 20 25 30 35 input-output differential (V) Input voltage ?(V) www..com YOUW ANG ELECTRONI CO. CS LTD 8 |
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