Semiconductor Components Industries, LLC, 2002 January, 2002 Rev. 3 1 Publication Order Number: LM317/D 查询 LM317BD2T 供应商捷多邦, 专业 PCB 打样工厂,24 小时加急出货 Th

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5 A over an output voltage range of 1.2 V to 37 V. This voltage regulator is exceptionally easy to use and requires only two external resistors to set the output voltage.

1 Semiconductor Components Industries, LLC, 2002 January, 2002 Rev. 3 1 Publication Order Number: /D 查询 BD2T 供应商捷多邦, 专业 PCB 打样工厂,24 小时加急出货 The is an adjustable 3terminal positive voltage regulator capable of supplying in excess of 1.5 A over an output voltage range of 1.2 V to 37 V. This voltage regulator is exceptionally easy to use and requires only two external resistors to set the output voltage. Further, it employs internal current limiting, thermal shutdown and safe area compensation, making it essentially blowout proof. The serves a wide variety of applications including local, on card regulation. This device can also be used to make a programmable output regulator, or by connecting a fixed resistor between the adjustment and output, the can be used as a precision current regulator. Output Current in Excess of 1.5 A Output Adjustable between 1.2 V and 37 V Internal Thermal Overload Protection Internal Short Circuit Current Limiting Constant with Temperature Output Transistor SafeArea Compensation Floating Operation for High Voltage Applications Available in Surface Mount D 2 PAK, and Standard 3Lead Transistor Package Eliminates Stocking many Fixed Voltages THREETERMINAL ADJUSTABLE POSITIVE VOLTAGE REGULATOR SEMICONDUCTOR TECHNICAL DATA T SUFFIX PLASTIC PACKAGE CASE 221A Standard Application D2T SUFFIX PLASTIC PACKAGE CASE 936 (D 2 PAK) D2T T ORDERING INFORMATION Device Operating Temperature Range Package BD2T Surface Mount T J = 40 to +125 C BT Insertion Mount T J = 0 to +125 C Surface Mount Insertion Mount µ

2 MAXIMUM RATINGS Rating Symbol Value Unit InputOutput Voltage Differential V I V O 40 Vdc Power Dissipation Case 221A T A = +25 C P D Internally Limited W Thermal Resistance, JunctiontoAmbient θ JA 65 C/W Thermal Resistance, JunctiontoCase θ JC 5.0 C/W Case 936 (D 2 PAK) T A = +25 C P D Internally Limited W Thermal Resistance, JunctiontoAmbient θ JA 70 C/W Thermal Resistance, JunctiontoCase θ JC 5.0 C/W Operating Junction Temperature Range T J 40 to +125 C Storage Temperature Range T stg 65 to +150 C ELECTRICAL CHARACTERISTICS (V I V O = 5.0 V; I O = 0.5 A for D2T and T packages; T J = T low to T high [Note 1]; I max and P max [Note 2]; unless otherwise noted.) Characteristics Figure Symbol Min Typ Max Unit Line Regulation (Note 3), T A = +25 C, 3.0 V V I V O 40 V 1 Reg line %/V Load Regulation (Note 3), T A = +25 C, 10 ma I O I max V O 5.0 V V O 5.0 V 2 Reg load Thermal Regulation, T A = +25 C (Note 6), 20 ms Pulse Reg therm % V O /W Adjustment Pin Current 3 I Adj µa Adjustment Pin Current Change, 2.5 V V I V O 40 V, 1, 2 I Adj µa 10 ma I L I max, P D P max Reference Voltage, 3.0 V V I V O 40 V, 3 V ref V 10 ma I O I max, P D P max Line Regulation (Note 3), 3.0 V V I V O 40 V 1 Reg line % V mv % V O Load Regulation (Note 3), 10 ma I O I max V O 5.0 V V O 5.0 V 2 Reg load mv % V O Temperature Stability (T low T J T high ) 3 T S 0.7 % V O Minimum Load Current to Maintain Regulation (V I V O = 40 V) 3 I Lmin ma Maximum Output Current V I V O 15 V, P D P max, T Package V I V O = 40 V, P D P max, T A = +25 C, T Package 3 I max A RMS Noise, % of V O, T A = +25 C, 10 Hz f 10 khz N % V O Ripple Rejection, V O = 10 V, f = 120 Hz (Note 4) Without C Adj C Adj = 10 µf LongTerm Stability, T J = T high (Note 5), T A = +25 C for Endpoint Measurements 4 RR S %/1.0 k Hrs. db Thermal Resistance Junction to Case, T Package R θjc 5.0 C/W NOTES: 1. T low to T high = 0 to +125 C, for T, D2T. T low to T high = 40 to +125 C, for BT, BD2T. 2. I max = 1.5 A, P max = 20 W 3. Load and line regulation are specified at constant junction temperature. Changes in V O due to heating effects must be taken into account separately. Pulse testing with low duty cycle is used. 4. C Adj, when used, is connected between the adjustment pin and ground. 5. Since LongTerm Stability cannot be measured on each device before shipment, this specification is an engineering estimate of average stability from lot to lot. 6. Power dissipation within an IC voltage regulator produces a temperature gradient on the die, affecting individual IC components on the die. These effects can be minimized by proper integrated circuit design and layout techniques. Thermal Regulation is the effect of these temperature gradients on the output voltage and is expressed in percentage of output change per watt of power change in a specified time.

3 Representative Schematic Diagram This device contains 29 active transistors. Figure 1. Line Regulation and I Adj /Line Test Circuit

4 Figure 2. Load Regulation and I Adj /Load Test Circuit Figure 3. Standard Test Circuit µ µ Figure 4. Ripple Rejection Test Circuit

5 Figure 5. Load Regulation Figure 6. Current Limit µ Figure 7. Adjustment Pin Current Figure 8. Dropout Voltage Figure 9. Temperature Stability Figure 10. Minimum Operating Current

6 µ Figure 11. Ripple Rejection versus Output Voltage µ Figure 12. Ripple Rejection versus Output Current µ Ω µ Figure 13. Ripple Rejection versus Frequency Figure 14. Output Impedance µ µ µ µ Figure 15. Line Transient Response Figure 16. Load Transient Response

7 APPLICATIONS INFORMATION Basic Circuit Operation The is a 3terminal floating regulator. In operation, the develops and maintains a nominal 1.25 V reference (V ref ) between its output and adjustment terminals. This reference voltage is converted to a programming current (I PROG ) by R 1 (see Figure 17), and this constant current flows through R 2 to ground. The regulated output voltage is given by: Since the current from the adjustment terminal (I Adj ) represents an error term in the equation, the was designed to control I Adj to less than 100 µa 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 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. External Capacitors A 0.1 µf disc or 1.0 µf tantalum input bypass capacitor (C in ) is recommended to reduce the sensitivity to input line impedance. The adjustment terminal may be bypassed to ground to improve ripple rejection. This capacitor (C Adj ) prevents ripple from being amplified as the output voltage is increased. A 10 µf capacitor should improve ripple rejection about 15 db at 120 Hz in a 10 V application. Although the is stable with no output capacitance, like any feedback circuit, certain values of external capacitance can cause excessive ringing. An output capacitance (C O ) in the form of a 1.0 µf tantalum or 25 µf 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. Figure 18 shows the with the recommended protection diodes for output voltages in excess of 25 V or high capacitance values (C O > 25 µf, C Adj > 10 µf). Diode D 1 prevents C O from discharging thru the IC during an input short circuit. Diode D 2 protects against capacitor C Adj discharging through the IC during an output short circuit. The combination of diodes D 1 and D 2 prevents C Adj from discharging through the IC during an input short circuit. Figure 17. Basic Circuit Configuration Load Regulation The is capable of providing extremely good load regulation, but a few precautions are needed to obtain maximum performance. For best performance, the programming resistor (R 1 ) should be connected as close to the regulator as possible to minimize line drops which effectively appear in series with the reference, thereby degrading regulation. The ground end of R 2 can be returned near the load ground to provide remote ground sensing and improve load regulation. Figure 18. Voltage Regulator with Protection Diodes

8 θ θ ÎÎÎÎ ÎÎÎÎ ÎÎÎÎ Figure 19. D 2 PAK Thermal Resistance and Maximum Power Dissipation versus P.C.B. Copper Length µ Figure 20. Laboratory Power Supply with Adjustable Current Limit and Output Voltage

9 Figure 21. Adjustable Current Limiter Figure V Electronic Shutdown Regulator µ Figure 23. Slow TurnOn Regulator Figure 24. Current Regulator

10 PACKAGE DIMENSIONS T SUFFIX PLASTIC PACKAGE CASE 221A09 ISSUE AA H Q Z L V G B N D A K F T U S R J C T D2T SUFFIX PLASTIC PACKAGE CASE (D 2 PAK) ISSUE B K B F J D C A G S H OPTIONAL CHAMFER E N T M R L V P TERMINAL 4 U

11 Notes

12 ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. Typical parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including Typicals must be validated for each customer application by customer s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. PUBLICATION ORDERING INFORMATION Literature Fulfillment: Literature Distribution Center for ON Semiconductor P.O. Box 5163, Denver, Colorado USA Phone: or Toll Free USA/Canada Fax: or Toll Free USA/Canada ONlit@hibbertco.com N. American Technical Support: Toll Free USA/Canada JAPAN: ON Semiconductor, Japan Customer Focus Center 4321 NishiGotanda, Shinagawaku, Tokyo, Japan Phone: r14525@onsemi.com ON Semiconductor Website: For additional information, please contact your local Sales Representative.

Pin Configurations Figure2. Pin Configuration of FS2012 (Top View) Table 1 Pin Description Pin Number Pin Name Description 1 GND 2 FB 3 SW Ground Pin.

Pin Configurations Figure2. Pin Configuration of FS2012 (Top View) Table 1 Pin Description Pin Number Pin Name Description 1 GND 2 FB 3 SW Ground Pin. Features Wide 3.6V to 32V Input Voltage Range Output Adjustable from 0.8V to 30V Maximum Duty Cycle 100% Minimum Drop Out 0.6V Fixed 300KHz Switching Frequency 12A Constant Output Current Capability Internal

Semiconductor Components Industries, LLC, 2002 January, 2002 Rev. 3 1 Publication Order Number: LM317/D 查询 LM317BD2T 供应商 捷多邦, 专业 PCB 打样工厂,24 小时加急出货 Th

Semiconductor Components Industries, LLC, 2002 January, 2002 Rev. 3 1 Publication Order Number: LM317/D 查询 LM317BD2T 供应商捷多邦, 专业 PCB 打样工厂,24 小时加急出货 Th