X317 LINEAR INTEGRATED CIRCUIT 3-TERMINAL 1A POSITIVE ADJUSTABLE VOLTAGE REGULATOR DESCRIPTION The X317 is an adjustable 3-termina lpositive voltage regulator designed to supply more than 1.5A of output current with voltage adjustable from 1.3V to 37V 1 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:ADJ;2:OUTPUT;3:INPUT TO-220 BLOCK DIAGRAM INPUT VREF PROTECTION CIRCUIT OUTPUT VAdj ABSOLUTE MAXIMUN RATINGSTa=25°C, UNLESS OTHERWISE SPECIFIED PARAMETERS RATING UNITS VI-VO 40 V Lead Temperature TLEAD 230 °C PD Internal limited ü Operating Temperature Range TOPR 0~+125 °C Storage Temperature Range TSTG -65~+150 °C Power Dissipation X317 SYMBOL Input - Output Voltage Difference 1 X317 LINEAR INTEGRATED CIRCUIT ELECTRICAL CHARACTERISTICS VI-VO=5V,0°C <Tj<125°C,IO=500mA,IMAX=1.5A,PMAX=20W , unless otherwise specified Parameter Line Regulation Load Regulation Symbol ∆VO ∆VO Adjustable Pin current IADJ Adjustable Pin Current ∆IADJ Min Typ Max Ta=25°C,3V≤VI-VO≤40V 0.01 0.04 Ta=0125°C,3V≤VI-VO≤40V 0.02 0.07 Unit %/V 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 2.5V≤VI-VO≤40V, 46 100 µA 2.0 5 µA 1.25 1.30 V 10mA≤Io≤IMAX,PD≤PMAX Change Reference Voltage Test conditions VREF 3V≤VI-VO≤40V, 1.20 10mA≤IO≤IMAX,PD≤PMAX Temperature Stability STT Minimum Load Current IL(MIN) VI-VO=40V 0.7 IO(MAX) VI-VO≤15V,PD≤PMAX 1.5 VI-VO≤15V,PD≤PMAX,Ta=25°C 0.15 3.5 %/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,CADJ=0 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 RθJC 5 °C /W Thermal Resistance Note: Testing with low duty pulse should be used to avoid heating effect. X317 2 X317 LINEAR INTEGRATED CIRCUIT TYPICAL CHARACTERISTICS PERFORMANCE Fig.1. Load Regulation vs temperature Fig.2 Adjustment Current vs Temperature 0.2 60 0.0 55 Adjustment Current Output Voltage Deviation -0.2 -0.4 Vi=15V Vo=10V -0.6 50 45 40 -0.8 -1.0 0 50 25 75 100 35 -50 125 -25 0 Temperature Fig.3. Dropout Voltage vs InputOutput Voltage Difference 3.0 25 50 75 100 125 Temperature Fig.4 Reference Voltage vs Temperature 1.260 IL=1.5A 1.255 2.5 Reference Voltage Input-Output Voltage Difference Vo=100mV IL=1A 2.0 IL=500mA IL=200mA 1.250 1.245 1.5 IL=20mA 1.240 1.235 1.0 0 25 50 75 100 125 -50 -25 0 Temperature 25 50 75 100 125 Temperature TYPICAL APPLICATION CIRCUITS D1 1N4002 Vi 3 X317 Vo 2 Vi 3 X317 Vo 2 1µF 1 Iadj C1 0.1µF 1 R1 Co 1µF 1kΩ 720Ω R2 Fig.5 Programmable voltage regulator 120Ω TTL Level signal 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. X317 3 LINEAR INTEGRATED CIRCUIT X317 Vi Vo 3 X317 2 D1 1N4001 1 Vadj Vi 3 X317 R1 2 R2 Io Vo 1 240Ω Iadj 50kΩ R2 10µF Iomax=( Iomin=( Vref 1.25V )+Iadj= R1 R1 1.25V Vref )+Iadj= R1+R2 R1+R2 5mA<Io<100mA Fig.7 Soft start application Fig.8 Constant current application X317 4