IP78T12CT IP78T12ACT SEME LAB 12 VOLT, 3 AMP POSITIVE VOLTAGE REGULATOR MECHANICAL DATA Dimensions in mm (Inches) T Package — TO–220 Plastic Package 2 10.16 ± 0.25 (0.400 ± 0.01) 4.45 ± 0.25 (0.175 ± 0.010) FEATURES 14.99 ± 0.25 (0.590 ± 0.010) 3.12 ± 0.25 (0.123 ± 0.010) 1.27 ± 0.13 (0.050 ± 0.005) • 0.3%/A LOAD REGULATION 3.96 ± 0.13 Dia. (0.156 ± 0.005) • THERMAL OVERLOAD PROTECTION 28.78 ± 0.25 (1.133 ± 0.010) 9.04 ± 0.25 (0.356 ± 0.010) 0.181 (0.07) min. 1 2 3 14.73 (0.580) 12.70 (0.500) • 0.04%/V LINE REGULATION 3˚ 7.5˚ 0.81 ± 0.13 (0.032 ± 0.005) • 1% TOLERANCE 0.38 ± 0.051 (0.015 ± 0.002) • ALTERNATE PACKAGE STYLES AVAILABLE 2.59 ± 0.30 (0.102 ± 0.012) 5.08 (0.200) Nom. Pin 1 – VIN • SAFE OPERATING AREA PROTECTION • START–UP WITH NEGATIVE VOLTAGE (± SUPPLIES) ON OUTPUT 1.27 ± 0.13 (0.050 ± 0.005) 2.54 ± 0.13 (0.100 ± 0.005) • SHORT CIRCUIT PROTECTION Pin 2 – Gnd Pin 3 – VOUT ABSOLUTE MAXIMUM RATINGS (Tcase = 25°C unless otherwise stated) VI DC Input Voltage 35V PD Power Dissipation Internally limited Tj Operating Junction Temperature Range Tstg Storage Temperature Range TL Lead Temperature (Soldering, 10 sec) Semelab plc. Telephone +44(0)1455 556565. Fax +44(0)1455 552612. E-mail: [email protected] Website: http://www.semelab.co.uk 0°C to +125°C –65°C to +150°C 300°C Prelim. 9/94 IP78T12CT IP78T12ACT SEME LAB ELECTRICAL CHARACTERISTICS Parameter VO (TJ = 25°C unless otherwise stated) Test Conditions Output Voltage Min. IO = 1A VIN = 14.8V 11.88 VIN = 15.4V to 22V POUT £ 25W IO = 5mA to 3A TJ = 0 to +125°C DVO Line Regulation DVO Load Regulation IQ Quiescent Current IO = 1A 12 11.64 VIN = 14.8V to 22V TJ = 0 to +125°C IO = 5mA to 3A VIN = 15.4V TJ = 0 to +125°C IO = 5mA to 3A VIN = 15.4V TJ = 0 to +125°C IO = 5mA to 3A DIQ IP78T12ACT Typ. Max. VIN = 15.4V Quiescent Current TJ = 0 to +125°C Change IO = 1A VIN = 14.8V to 22V TJ = 0 to +125°C VN Output Noise Voltage DVIN DVO Ripple Rejection VIN = 15.4V to 25.4V IO = 1A 12.12 11.5 12.36 11.4 IP78T12CT Typ. Max. Units 12.5 V 12.6 V 36 60 mV 75 150 mV 10 14 mA 1.5 3.0 mA 1.5 3.0 mA 12 75 75 f = 10Hz to 100kHz f = 120Hz Min. s TJ = 25°C 58 TJ = 0 to +125°C 52 52 72 72 48 dB ISC Short Circuit Current VIN = 15.4V 3 3 Ipk Peak Output Current VIN = 15.4V 4 4 Junction to Case 84 84 Long Term Stability RqJC Thermal Resistance mVrm 3 4 4 A mV All characteristics are measured with a capacitor across the input of 0.22mF and a capacitor across the output of 0.1mF. All characteristics except noise voltage and ripple rejection ratios are measured using pulse techniques (tp £ 10ms , d £ 5%). Output voltage changes due to changes into internal temperature must be taken into account separately. Semelab plc. Telephone +44(0)1455 556565. Fax +44(0)1455 552612. E-mail: [email protected] Website: http://www.semelab.co.uk Prelim. 9/94 IP78T12CT IP78T12ACT SEME LAB TYPICAL PERFORMANCE CHARACTERISTICS OUTPUT VOLTAGE (Normalised to 1V at TJ = 25°C) OUTPUT IMPEDANCE 10 V IN = 10V 1.01 Output Im pedance (Ω ) Normalised Output Voltage (V) 1.02 1.00 0.99 VOU T = 5V 1 C OU T = 0 IOU T= 1A 0.1 C OU T = 10 µF 0.01 0.001 0.0001 10 0.98 0 25 50 75 100 125 100 Temperature (˚C) 1k 10k 100k 1M Frequency (Hz) RIPPLE REJECTION RIPPLE REJECTION 100 90 Ripple Rejection (dB) Ripple Rejection (dB) IOU T = 50mA 80 IOUT = 3A 60 VOU T = 5V V IN = 13V D C + 3.5V rms C OU T = 0 40 80 70 F = 120Hz VIN – VOU T = 8V DC + 3.5V rm s 60 I OU T = 1A T J = 25˚C T J = 25˚C 20 1 10 100 1k 10k 100k 50 1M 0 5 Frequency (Hz) CURRENT LIMIT 15 20 25 DROPOUT VOLTAGE 6 2.50 4 Input – Output Differential (V) 5 Output Current (A) 10 Output Voltage (V) T J = 25˚C 3 2 1 ∆VOU T = 100m V 2.25 2.00 I OU T = 3A 1.75 I OUT = 1A 1.50 1.25 I OU T = 0.5A 1.00 0.75 0 0.50 0 5 10 15 20 25 30 35 0 Input – Output Differential (V) Semelab plc. Telephone +44(0)1455 556565. Fax +44(0)1455 552612. E-mail: [email protected] Website: http://www.semelab.co.uk 25 50 75 100 125 Junction Temperature (˚C) Prelim. 9/94 IP78T12CT IP78T12ACT SEME LAB TYPICAL PERFORMANCE CHARACTERISTICS QUIESCENT CURRENT QUIESCENT CURRENT 5.50 6.50 VOUT = 5V I OUT = 1A Quiescent Current (m A) O utput Current (m A) 6.00 T J = 25˚C 5.50 5.00 4.50 5.00 4.50 V IN = 10V 4.00 VOU T = 5V 4.00 IOU T = 1A 3.50 3.50 5 10 15 20 25 30 35 0 25 Input Voltage (V) 50 75 100 125 Junction Temperature (˚C) APPLICATIONS INFORMATION FIXED OUTPUT REGULATOR IN P U T 1 R EGU LATOR 2 ADJUSTABLE OUTPUT REGULATOR OUTP UT INP U T 1 R E GULA TOR 2 OUTP UT R1 C 1* 0.22 µF 3 GN D C1 0.22 µF C 2** 3 GN D R2 * Required if the regulator is located far from the power supply filter. ** Although no output capacitor is needed for stability, it does help transient response. If needed, use a 0.1mF ceramic disk. VOUT = VREG + (VREG / R1 + IQ) R2 VREG / R1 > 3 IQ ( R1 + R2 ) Load Regulation (Lr) » R1 [ ] (LR of regulator) CURRENT REGULATOR IN PU T 1 RE GU LA TO R 2 R1 C1 0.22 µF 3 OU TPU T I OU T VREG + IQ R1 DIQ = 3.0mA over line and load changes. IOUT = Semelab plc. Telephone +44(0)1455 556565. Fax +44(0)1455 552612. E-mail: [email protected] Website: http://www.semelab.co.uk Prelim. 9/94