UTC LM317 LINEAR INTEGRATED CIRCUIT 3-TERMINAL 1A POSITIVE ADJUSTABLE VOLTAGE REGULATOR DESCRIPTION 1 The UTC LM317 is an adjustable 3-terminal positive TO-220 voltage regulator, designed to supply more than 1.5A of output current with voltage adjustable from 1.3 to 37V. FEATURES *Output current up to 1.5A. *Output voltage adjustable from 1.3V to 37V. 1 TO-263 *Internal short circuit protection. *Internal over temperature protection. *Safe-Area compensation for output transistor. 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 LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATINGS(Ta=25°C, UNLESS OTHERWISE SPECIFIED) Input - Output PARAMETER SYMBOL VALUE Voltage Difference VI-VO 40 V TLEAD 230 °C PD Internal limited Lead Temperature Power Dissipation UNIT Operating Temperature Range TOPR 0~125 °C Storage Temperature Range TSTG -65~150 °C ELECTRICAL CHARACTERISTICS (VI-VO=5V, 0°C <Tj<125°C,IO=500mA,IMAX=1.5A,PMAX=20W , unless otherwise specified) PARAMETER SYMBOL TEST CONDITIONS TYP MAX Line Regulation ∆VO Ta=25°C,3V<=VI-VO<=40V 0.01 0.04 %/V Ta=0 - 125°C,3V<=VI-VO<=40V 0.02 0.07 %/V ∆VO Load Regulation Adjustable Pin Current IADJ Adjustable Pin Current ∆IADJ Change MIN UNIT Ta=25°C VO<=6V 18 25 mV 10mA<=IO<=IMAX VO>=5V 0.4 0.5 %/VO 10mA<=IO<=IMAX VO<=5V 40 70 mV VO>=6V 0.8 1.5 %/VO 46 100 µA 2.0 5 µA 1.25 1.30 V 2.5V<=VI-VO<=40V, 10mA<=Io<=IMAX, PD<=PMAX Reference Voltage VREF 3V<=VI-VO<=40V, 1.20 10mA<=IO<=IMAX,PD<=PMAX Temperature Stability STT Minimum Load Current 0.7 IL(MIN) VI-VO=40V 3.5 IO(MAX) VI-VO<=15V, PD<=PMAX 1.5 VI-VO<=15V, PD<=PMAX,Ta=25°C 0.15 %/VO 10 mA for Regulation Maximum Output 2.2 A Current RMS Noise v.s. eN TA=25°C,10HZ<=f<=10KHZ 0.4 0.003 0.01 %/VO %of Vout Ripple Rejection RR VO=10V,f=120HZ, VO=10V,f=120HZ,CADJ=10µF Long-term Stability, ST TA=25°C,1000 hr 60 66 dB 75 0.3 1 % TJ=THIGH Junction to Case R θ JC °C/W 5 Thermal Resistance 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 TYPICAL PERFORMANCE CHARACTERISTICS Fig.1. Load Regulation vs temperature Fig.2 Adjustment Current vs Temperature 60 0.0 Adjustment Current Output Voltage Deviation 0.2 -0.2 -0.4 Vi=15V Vo=10V -0.6 55 50 45 40 -0.8 -1.0 0 25 50 75 100 35 -50 125 -25 0 Temperature 3.0 25 50 75 100 125 Temperature Fig.3. Dropout Voltage vs InputOutput Voltage Difference Fig.4 Reference Voltage vs Temperature 1.260 IL=1.5A 1.255 Reference Voltage Input-Output Voltage Difference ∆Vo=100mV 2.5 IL=1A 2.0 IL=500mA IL=200mA 1.250 1.245 1.5 IL=20mA 1.0 0 1.240 1.235 25 50 75 Temperature UTC 100 125 -50 -25 0 25 50 75 100 125 Temperature UNISONIC TECHNOLOGIES CO., LTD. 3 QW-R101-009,B UTC LM317 LINEAR INTEGRATED CIRCUIT APPLICATION CIRCUIT D1 1N4002 Vi 3 Vo 2 ll 1 R1 Iadj Vi C1 0.1 µF 3 Co 1 µF UTC LM317 1 R2 Vo 2 1 µF 120Ω 1kΩ 720Ω TTL Level signal Fig.5 Programmable voltage regulator Fig.6 Regulator with On-off control 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. Vi Vo 3 UTC LM317 2 1 Vadj 240 Ω D1 1N4001 Vi 3 UTC LM317 2 10 µF R2 Io Vo 1 Iadj 50kΩ R2 R1 Vref 1.25V Iomax=( )+Iadj= R1 R1 Iomin=( Vref 1.25V )+Iadj= R1+R2 R1+R2 5mA<Io<100mA Fig.7 Soft start application UTC Fig.8 Constant current application UNISONIC TECHNOLOGIES CO., LTD. 4 QW-R101-009,B