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| UTC LM317 LINEAR INTEGRATED CIRCUIT 3-TERMINAL 1A POSITIVE ADJUSTABLE VOLTAGE REGULATOR DESCRIPTION The UTC LM317 is an adjustable 3-terminal positive voltage regulator, designed to supply more than 1.5A of output current with voltage adjustable from 1.3 to 37V. 1 TO-220 FEATURES *Output current up to 1.5A. *Output voltage adjustable from 1.3V to 37V. *Internal short circuit protection. *Internal over temperature protection. *Safe-Area compensation for output transistor. 1 TO-263 1 TO-252 1:ADJ 2:Output 3:Input BLOCK DIAGRAM INPUT VREF PROTECTION CIRCUIT OUTPUT VAdj UTC UNISONIC TECHNOLOGIES CO., LTD. 1 QW-R101-009,B UTC LM317 PARAMETER Input - Output Voltage Difference Lead Temperature Power Dissipation Operating Temperature Range Storage Temperature Range LINEAR INTEGRATED CIRCUIT SYMBOL VI-VO TLEAD PD TOPR TSTG ABSOLUTE MAXIMUM RATINGS(Ta=25C, UNLESS OTHERWISE SPECIFIED) VALUE 40 230 Internal limited 0~125 -65~150 C C UNIT V C ELECTRICAL CHARACTERISTICS (VI-VO=5V, 0C Line Regulation SYMBOL VO TEST CONDITIONS Ta=25C,3V<=VI-VO<=40V Ta=0 - 125C,3V<=VI-VO<=40V Ta=25C VO<=6V VO>=5V VO<=5V VO>=6V MIN TYP 0.01 0.02 18 0.4 40 0.8 46 2.0 MAX 0.04 0.07 25 0.5 70 1.5 100 5 1.30 UNIT %/V %/V mV %/VO mV %/VO A A V %/VO Load Regulation VO 10mA<=IO<=IMAX 10mA<=IO<=IMAX Adjustable Pin Current Adjustable Pin Current Change Reference Voltage Temperature Stability Minimum Load Current for Regulation Maximum Output Current IADJ IADJ VREF STT IL(MIN) IO(MAX) VI-VO=40V VI-VO<=15V, PD<=PMAX VI-VO<=15V, PD<=PMAX,Ta=25C 1.5 0.15 2.5V<=VI-VO<=40V, 10mA<=Io<=IMAX, PD<=PMAX 3V<=VI-VO<=40V, 10mA<=IO<=IMAX,PD<=PMAX 1.20 1.25 0.7 3.5 2.2 0.4 0.003 60 10 mA A RMS Noise v.s. %of Vout Ripple Rejection Long-term Stability, TJ=THIGH Junction to Case Thermal Resistance eN RR ST R JC TA=25C,10HZ<=f<=10KHZ VO=10V,f=120HZ, VO=10V,f=120HZ,CADJ=10F TA=25C,1000 hr 66 0.01 %/VO dB 75 0.3 5 1 % C/W Note: Testing with low duty pulse should be used to avoid heating effect. UTC UNISONIC TECHNOLOGIES CO., LTD. 2 QW-R101-009,B UTC LM317 LINEAR INTEGRATED CIRCUIT Fig.2 Adjustment Current vs Temperature 60 TYPICAL PERFORMANCE CHARACTERISTICS Fig.1. Load Regulation vs temperature 0.2 Output Voltage Deviation 0.0 -0.2 Adjustment Current 50 75 100 125 55 50 -0.4 Vi=15V Vo=10V -0.6 -0.8 -1.0 0 25 45 40 35 -50 -25 0 25 50 75 100 125 Temperature Temperature 3.0 Fig.3. Dropout Voltage vs InputOutput Voltage Difference Vo=100mV IL=1.5A Fig.4 Reference Voltage vs Temperature 1.260 Input-Output Voltage Difference 1.255 2.5 IL=1A 2.0 IL=500mA IL=200mA 1.5 IL=20mA 1.240 Reference Voltage 100 125 1.250 1.245 1.0 0 1.235 25 50 75 -50 -25 0 25 50 75 100 125 Temperature Temperature UTC UNISONIC TECHNOLOGIES CO., LTD. 3 QW-R101-009,B UTC LM317 APPLICATION CIRCUIT LINEAR INTEGRATED CIRCUIT D1 1N4002 Vi 3 ll 1 Iadj 2 Vo R1 Co 1 F Vi 3 C1 0.1 F R2 UTC LM317 1 2 Vo 1 F 120 1k 720 TTL Level signal Fig.5 Programmable voltage regulator Vo=1.25V*(1+R2/R1)+Iadj*R2 C1 is required when regulator is located an appreciated distance from power supply. Co is needed to improve transient response. Fig.6 Regulator with On-off control Vi 3 Vo UTC LM317 2 1 Vadj 240 D1 1N4001 Vi 3 UTC LM317 2 1 R1 R2 Io Vo 50k R2 10 F Iadj Vref 1.25V Iomax=( )+Iadj= R1 R1 Iomin=( Vref 1.25V )+Iadj= R1+R2 R1+R2 5mA Fig.8 Constant current application UTC UNISONIC TECHNOLOGIES CO., LTD. 4 QW-R101-009,B |
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