GM317 GAMMA | Alldatasheet
Document overview
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Technical content
Features
Output current up to 1.5A Output Voltages 1.2V to 37V Input Regulation typ. 0.01% Output Regulation typ. 0.1% Peak Output Current Constant over Temperature Range of Regulator Available in TO-220, TO-263, TO252 and SOT223 Packages Ripple Rejection Typically 80dB Direct replacements for LM317
Applications
Voltage Regulators Power Supplies Current Regulators Switching Regulators Current Limiter Constant Current Battery Charger Current Limited Charger Typical Application Circuit
2 GM317V1.01 GM317 3-TERMINAL 1.5A ADJUSTABLE REGULATOR Marking Information and Pin Configurations (Top View) TO 252 (D-PAK) TO 220 TO 263 (D2-PAK) SOT223 A: Assembly / Test site code Y: Year WW: Week
Ordering Information
Ordering Number VOUT Package Shipping GM317TA3T TO-263 50 Units/Tube GM317TA3R TO-263 800 Units / Tape & Reel GM317TB3T TO-220 50 Units/Tube GM317TC3T TO-252 80 Units/Tube GM317TC3R TO-252 2,500 Units / Tape & Reel GM317ST3T SOT-223 80 Units/Tube GM317ST3R Adj SOT-223 2,500 Units / Tape & Reel GM317 AYWW GM317 AYWW GM317 AYWW GM317 AYWW 1. Adj 2. VOUT 3. VIN 1. Adj 2. VOUT 3. VIN 1. Adj 2. VOUT 3. VIN 1. Adj 2. VOUT 3. VIN
3-TERMINAL 1.5A ADJUSTABLE REGULATOR GM317V1.01 Absolute Maximum Ratings PARAMETER RATINGS UNITS Input to Output Differential Voltage, VI – VO 40 V Continuous Total Dissipation at 25°C Free-air Temperature 2 Continuous Total Dissipation at (or bellow) 25°C Cast Temperature 15 W Operating Junction Temperature T J - 40 to 125 °C Storage Temperature T stg - 60 to 150 °C Lead Temperature 1.6mm (1/6 inch) from case for 10 seconds 260 °C Recommended Operating Conditions PARAMETER Min Max Unit Output Current, IO 10 1500 mA Operating Virtual Junction Temperature, TJ 0 125 °C Block Diagram VOUT VIN ADJ 31 310 220 120 5.6K 6.3V 13K 6.3V 170 160 125K 12.4K 6.7K 5pF 12K 510 6.8K 200 105 4.02.4K 2.5K 30pF 30pF 5.1K 110 5.8K 3.6K 190 6.3V
4 GM317V1.01 GM317 3-TERMINAL 1.5A ADJUSTABLE REGULATOR Electrical Characteristics (Unless otherwise noted, VI - VO = 5V and IO= 0.5A. TJ = Full Range, unless otherwise noted) Parameter Symbol Test Condition Min Typ Max Unit 3V ≤ VIN – VOUT ≤ 40V, TJ = 25°C 0.01 0.04 Line Regulation (note 2) ∆VOI 3V ≤ VIN – VOUT ≤ 40V, 0.02 0.07 %/V VOUT = 10V, f = 120Hz 65 Ripple Rejection Ratio VOUT = 10V, f = 120Hz, 10µF capacitor between ADJ and GND 66 80 dB VO ≤ 5V 5 25 mV 10mA ≤ IOUT ≤ 1.5A, TJ = 25°C VO > 5V 0.1 0.5 % VO ≤ 5V 20 70 mV Load regulation (note 3) ∆VOL 10mA ≤ IOUT ≤ 1.2A VO > 5V 0.3 1.5 % Output Voltage Change with Temperature ∆VOT Full Temperature Range % Long Term Stability (Note 4) TJ = 125 O C, VIN – VOUT = 40V, after 1000hr 0.3 1 % Output Noise Voltage 10Hz ≤ f ≤ 10KHz, TJ = 25°C 0.003 % Minimum Load Current VIN – VOUT ≤ 40V 3.5 10 mA Adjustment Pin Current IADJ 50 100 µA Adjustment Pin Current Change ∆IADJ 3V ≤ VIN – VOUT ≤ 40V 10mA ≤ IOUT ≤ 1.2A 0.2 5.0 µA Reference Voltage 3V ≤ VIN – VOUT ≤ 40V, 10mA ≤ IOUT ≤ 1.5A, P ≤ 15W 1.2 1.25 1.3 V Note 1: All characteristics are measured with a 0.1µF capacitor across the input and a 1µF capacitor across the output. Note 2: Input regulation is expressed here as the percentage change in output voltage per 1V change at the input. Note 3: Pulse testing techniques are used to maintain the junction temperature as close to the ambient temperature as possible. Thermal effects must be taken into account separately. Note 4: Since long-term drift cannot be measured on the individual devices prior to shipment, this specification is not intended to be a guarantee or warranty. It is an engineering estimate of the average drift to be expected from lot to lot.
3-TERMINAL 1.5A ADJUSTABLE REGULATOR GM317V1.01 VIN VOUT VREF IPROG IADJ GM317 Adjust VREF = 1.25V typical Basic Circuit Configuration VIN VOUT GM317 Adjust 1N4002 1N4002 CO CADJ CIN
Application Information
Basic Circuit Operation The GM317 is a 3- terminal floating regulator. In operation, the GM317 develops and maintains a nominal 1.25V reference (VREF) between its output and adjustment terminals. This reference voltage is converted to a programming current flow through R2 to ground. The regulated output voltage is given by: Since the current from the adjustment terminal (IADJ) represents an error term in the equation, the GM317was designed to control IADJ to less than 100µA and keep it constant. To do this, all quiescent operating current is returned to the output terminal. This imposes the requirement for a minimum load current. If the load current is less than this minimum, the output voltage will rise. Since the GM317 is a floating regulator, it is only the voltage differential across the circuit which is important to performance, and operation at high voltages with respect to ground is possible. Load Regulation The GM317 is capable of providing extremely good load regulation, but a few precautions are needed to obtain maximum performance. For best performance, the progra mming resistor R1 should be connected as close to the regulator as possible to minimize line drops which effe ctively appear in series wi th the reference, thereby degrading regulation. The ground end of R2 can be returned near the load ground to provide re mote ground sensing and improve load regulation. External Capacitors A 0.1µF disc or 1.0µF tantalum input bypass capacitor CIN is recommended to reduce the sensitivity to input line impedance. The adjustment terminal may be bypassed to ground to improve ripple rejection. This capacitor CADJ prevents ripple from being amplified as the output voltage is increased. A 10µF capacitor should improve ripple rejection about 15 dB at 120Hz in a 10V application. Although the GM317 is stable with no output capacitance, like any feedback circuit, certain values of external capacitance can cause excessive ringing. An output capacitance CO in the form of a 1.0µF tantalum or 25µF aluminum electrolytic capacitor on the output swamps this effect and insures stability. Protection Diodes When external capacitors are used with any IC regulator, it is sometimes necessary to add protection diodes to prevent the capacitors from discharging through low current points into the regulator. The figure below shows the GM317 with the recommended protection diodes for output for output voltage in excess of 25V or high capacitance values (CO > 25µF, CADJ > 10µF). Diode D1 prevents CO from discharging thru the IC during an input short circuit. Diode D2 protects against capacitor CADJ discharging through the IC during an output short circuit. The combination of diodes D1 and D2 prevents CADJ from discharging through the IC during an input short circuit. VOUT = VREF (1 + R1 ) + IADJ R2 R2
3-TERMINAL 1.5A ADJUSTABLE REGULATOR GM317V1.01 0.248 - 0.264 (6.30 - 6.71) 0.116 - 0.124 (2.95 - 3.15) NOM 0.090 (2.29) 0.130 - 0.146 (3.30 - 3.71) 0.033 - 0.041 (0.84 - 1.04) NOM 10 - 16 10 - 16 (0.31) 0.012 MAX MIN 0.0008 - 0.0040 (0.0203 - 0.1016) 0.010 - 0.014 (0.25 - 0.36) 0.81 (4.6) 0.025 - 0.033 (0.64 - 0.84) NOM MAX 0.071 (1.8) 0.045 - 0.055 (1.143 - 1.397) 0.050 +/- 0.012 (1.270 +/- 0.305) 0.090 - 0.110 (2.286 - 2.794) 0.143 + 0.012 0.143 - 0.002 (3.632 + 0305) (3.362 - 0.508) 0.050 (1.270) 0.013 - 0.023 (0.330 - 0.584) TYP 0.059 (1.499) 0.020 - 0.039 (0.510 - 0.990) 0.330 - 0.370 (8.382 - 9.398) 0.060 (1.524) TYP 0.390 - 0.415 (9.906 - 10.541) TYP 0.105 - 0.180 (4.191 - 4.572) ° ° ° °
8 GM317V1.01 GM317 3-TERMINAL 1.5A ADJUSTABLE REGULATOR SEATING PLAN 0.370 – 0.410 (9.400 – 10.420) 0.205 – 0.215 (5.210 – 5.460) 0.210 – 0.228 (5.330 – 5.800) 0.055 – 0.080 (1.400 – 2.030) 0.018 – 0.023 (0.760 – 1.140) 0.180 (4.570) TYP 0.090 (2.285) TYP 0.045 – 0.060 (1.150 – 1.520) 0.039 – 0.050 (1.020 – 1.270) 0.018 – 0.023 (0.460 – 0.580) 0.020 (0.510) MIN
3-TERMINAL 1.5A ADJUSTABLE REGULATOR GM317V1.01 6 8 10 Ordering Number GM 317 TA3 T Package Type Shipping Type APM Gamma Micro Circuit Type TA3: TO263 TB3: TO220 TC3: TO252 ST3: SOT223 T: Tube R: Tape & Reel