西安交通大学：《工程训练之—工业系统的测量》（英文版）LM79XX Series 3-Terminal Negative

November 1994 National semiconductor LM79XX Series 3-Terminal Negative Regulators General Description hese devices need only one external com ation capacitor at the output. Tthe LM? aged in the to-220 power package and is capable applications requiring other voltages, see LM137 data 4 supplying 1.5A of output current These regulators employ internal current limiting safe area Features a Thermal, short circuit and sa tually all overload conditions. ■ High ripple rejection series allows output 1.5A output current he low preset value with a 4% tolerance on preset output voltage current drain Connection Diagrams Typical Applications TO-220 Package Fixed Regulator [ OUTPL LM70XXC INPUT Required if regulator is separated from filter capacitor by nore than 3. For value given, capacitor must be solid Front view tantalum. 25 uF aluminum electrolytic may be substituted. Order Number LM7905CT, LM7912CT or LM7915CT rEquired for stability. For value given, capacitor must be See NS Package Number TO3B solid tantalum. 25 uF aluminum lytic may be substi- ted Values given may be increased without limit. ss of 100 uF, a high current ode from input to output (1N4001, etc )will protect the ulator from momentary input shorts

TL/H/7340 LM79XX Series 3-Terminal Negative Regulators November 1994 LM79XX Series 3-Terminal Negative Regulators General Description The LM79XX series of 3-terminal regulators is available with fixed output voltages of b5V, b8V, b12V, and b15V. These devices need only one external componentÐa com￾pensation capacitor at the output. The LM79XX series is packaged in the TO-220 power package and is capable of supplying 1.5A of output current. These regulators employ internal current limiting safe area protection and thermal shutdown for protection against vir￾tually all overload conditions. Low ground pin current of the LM79XX series allows output voltage to be easily boosted above the preset value with a resistor divider. The low quiescent current drain of these devices with a specified maximum change with line and load ensures good regulation in the voltage boosted mode. For applications requiring other voltages, see LM137 data sheet. Features Y Thermal, short circuit and safe area protection Y High ripple rejection Y 1.5A output current Y 4% tolerance on preset output voltage Connection Diagrams TO-220 Package TL/H/7340 –14 Front View Order Number LM7905CT, LM7912CT or LM7915CT See NS Package Number TO3B Typical Applications Fixed Regulator TL/H/7340 –3 *Required if regulator is separated from filter capacitor by more than 3×. For value given, capacitor must be solid tantalum. 25 mF aluminum electrolytic may be substituted. ²Required for stability. For value given, capacitor must be solid tantalum. 25 mF aluminum electrolytic may be substi￾tuted. Values given may be increased without limit. For output capacitance in excess of 100 mF, a high current diode from input to output (1N4001, etc.) will protect the regulator from momentary input shorts. C1995 National Semiconductor Corporation RRD-B30M115/Printed in U. S. A

Absolute Maximum Ratings (Note 1) ntact the National Semiconductor sales Office/Distributors for availability and specifications. Input Voltage Power Dissipation( Note 2) Internally Limited Operating Junction Temperature I Storage Temperature Rang 65°cto+150°c Lead Temperature(Soldering, 10 sec. Electrical Characteristics conditions unless otherwise noted: louT =500 mA, CIN=2.2 HF, CouT=1uF Part Number LM7905C Units Input Voltage(unless otherwise specified) Symbol -5.2 5mA≤louT≤1A -5.25 Ps 15W 20≤VN≤-7) △vo Line Regulation TJ=25°C,(Note3) 50 (-25≤VN≤-7 Load Regulation TJ=25°c.(Note3) 250mA≤louT≤750mA Quiescent Current mA ge (-25≤VN≤-7 With Load,5mA≤ ≤1A 0.5 5°c,10Hz≤f≤100H f= 120 Hz (-18≤VN≤-8) copout Voltage T,=25"C,louT=1A lOMAx Peak Output CurrentTJ=25C mv/c Coefficient of 0c≤TJ≤100c Output Voltage Typical Applications (Continued) Variable Output 2HF R2 LM79XXCT ection. Do not increase beyond 50 uF. Select R2 as fowk LM7912CT 7500 LM7915CT 2

Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications. Input Voltage (Vo e b5V) b25V (Vo e b12V and b15V) b35V Input-Output Differential (Vo e b5V) 25V (Vo e b12V and b15V) 30V Power Dissipation (Note 2) Internally Limited Operating Junction Temperature Range 0§C to a125§C Storage Temperature Range b65§C to a150§C Lead Temperature (Soldering, 10 sec.) 230§C Electrical Characteristics Conditions unless otherwise noted: IOUT e 500 mA, CIN e 2.2 mF, COUT e 1 mF, 0§C s TJ s a125§C, Power Dissipation s 1.5W. Part Number LM7905C Units Output Voltage b5V Input Voltage (unless otherwise specified) b10V Symbol Parameter Conditions Min Typ Max VO Output Voltage TJ e 25§C b4.8 b5.0 b5.2 V 5 mA s IOUT s 1A, b4.75 b5.25 V P s 15W (b20 s VIN s b7) V DVO Line Regulation TJ e 25§C, (Note 3) 8 50 mV (b25 s VIN s b7) V 2 15 mV (b12 s VIN s b8) V DVO Load Regulation TJ e 25§C, (Note 3) 5 mA s IOUT s 1.5A 15 100 mV 250 mA s IOUT s 750 mA 5 50 mV IQ Quiescent Current TJ e 25§C 1 2 mA DIQ Quiescent Current With Line 0.5 mA Change (b25 s VIN s b7) V With Load, 5 mA s IOUT s 1A 0.5 mA Vn Output Noise Voltage TA e 25§C, 10 Hz s f s 100 Hz 125 mV Ripple Rejection f e 120 Hz 54 66 dB (b18 s VIN s b8) V Dropout Voltage TJ e 25§C, IOUT e 1A 1.1 V IOMAX Peak Output Current TJ e 25§C 2.2 A Average Temperature IOUT e 5 mA, 0.4 mV/§C Coefficient of 0 C s TJ s 100§C Output Voltage Typical Applications (Continued) Variable Output TL/H/7340 –2 *Improves transient response and ripple rejection. Do not increase beyond 50 mF. VOUT e VSET # R1 a R2 R2 J Select R2 as follows: LM7905CT 300X LM7912CT 750X LM7915CT 1k 2

Electrical Characteristics (Continued) Conditions unless otherwise noted: loUT =500 mA, CIN=2.2 HF u=1μF,0°css+125°c, Power Dissipation=1.5W Part Number LM7912 LM7915C Input Voltage(unless otherwise specified) 19y Symbo Typ Max Output Voltage 15.0 MA S lOuT≤1A 126-14.25 P≤15W (-27≤N≤-14.5)(-30≤WN≤-175)v TJ=25°C,(Note 10 (-30≤W≤-14 (-30≤vN≤-17 (-22≤VN≤-16) (-26≤WN≤-20) △vo| Load Regulation T=25°c,(Note3 5mA≤louT≤1.5A 15 200 250 mA S lOUT S 750 mA Quiescent Curren 1T=25°c 1.5 △lo uiescent Current With Line 0.5 0.5 (-30≤VN≤-145)(-30≤v1 Output Noise Voltage TA=25°c,10Hz≤f≤100Hz (-25≤N≤-15)(-30≤vN≤-175) DropoutVoltageTJ=25C,IouT=1A loMAx Peak Output Current TJ=25C rage Temperature lOUT=5mA, mv/°C 0c≤TJ≤100°c Output Voltage onal, but do not guarantee specific Performance limits For guaranteed specifications and test condtions, see the Electrical Characteristics. gn Considerations for details ote 3: Regulation is measured at a constant junction temperature by pulse testing with a low duty cycle. Changes in output voltage due to heating effects must be Typical Applications (Continued) Dual Trimmed Supply +INPUT 5.0V uF

Electrical Characteristics (Continued) Conditions unless otherwise noted: IOUT e 500 mA, CIN e 2.2 mF, COUT e 1 mF, 0§C s TJ s a125§C, Power Dissipation e 1.5W. Part Number LM7912C LM7915C Units Output Voltage b12V b15V Input Voltage (unless otherwise specified) b19V b23V Symbol Parameter Conditions Min Typ Max Min Typ Max VO Output Voltage TJ e 25§C b11.5 b12.0 b12.5 b14.4 b15.0 b15.6 V 5 mA s IOUT s 1A, b11.4 b12.6 b14.25 b15.75 V P s 15W (b27 s VIN s b14.5) (b30 s VIN s b17.5) V DVO Line Regulation TJ e 25§C, (Note 3) 5 80 5 100 mV (b30 s VIN s b14.5) (b30 s VINs b17.5) V 3 30 3 50 mV (b22 s VIN s b16) (b26 s VIN sb20) V DVO Load Regulation TJ e 25§C, (Note 3) 5 mA s IOUT s 1.5A 15 200 15 200 mV 250 mA s IOUT s 750 mA 5 75 5 75 mV IQ Quiescent Current TJ e 25§C 1.5 3 1.5 3 mA DIQ Quiescent Current With Line 0.5 0.5 mA Change (b30 s VIN s b14.5) (b30 sVIN s b17.5) V With Load, 5 mA s IOUT s 1A 0.5 0.5 mA Vn Output Noise Voltage TA e 25§C, 10 Hz s f s 100 Hz 300 375 mV Ripple Rejection f e 120 Hz 54 70 54 70 dB (b25 s VIN s b15) (b30 s VINs b17.5) V Dropout Voltage TJ e 25§C, IOUT e 1A 1.1 1.1 V IOMAX Peak Output Current TJ e 25§C 2.2 2.2 A Average Temperature IOUT e 5 mA, b0.8 b1.0 mV/§C Coefficient of 0 C s TJ s 100§C Output Voltage Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but do not guarantee Specific Performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. Note 2: Refer to Typical Performance Characteristics and Design Considerations for details. Note 3: Regulation is measured at a constant junction temperature by pulse testing with a low duty cycle. Changes in output voltage due to heating effects must be taken into account. Typical Applications (Continued) Dual Trimmed Supply TL/H/7340 –4 3

Design Considerations The LM79XX fixed voltage regulator series has thermal Where TJ Junction Temperatur for reducing the output current as the voltage across the PD Power Dissipation ss transistor is increased BJa Junction-to-Ambient Thermal Resistance ough the internal power eJc Junction-to-Case Thermal Resistance BCA Case-to-Ambient Thermal itions. To calculate the maximum junction ecs Case-to-Heat Sink Thermal Resistance at sink required, the following thermal resistance values esa Heat Sink-to-Ambient Thermal Resistance should be used. Typical Applications(Continued) Bypass capacitors ssary for stable operation of the Package LM79XX series of regulators over the input voltage and out- ecw|"cwlc/w°c/W actors will he transient response by the regulator To-220 J Max IA eca =ecs+ esa (without heat sink) pass capacitors should be mounted with the shortest Solving for TJ leads, and if possible, directly across the regulator termi- TJ= TA Pp(OJC t OcA) TA+ PoOja(without heat sink High Stability 1 Amp Regulator R2 LM308 LM7905 o our(-) TLH/7340·6 gulation< 0.01% temperature stability s 0.2% "Select resistors to set output voltage. 2 ppm/C tracking suggested

Design Considerations The LM79XX fixed voltage regulator series has thermal overload protection from excessive power dissipation, inter￾nal short circuit protection which limits the circuit’s maxi￾mum current, and output transistor safe-area compensation for reducing the output current as the voltage across the pass transistor is increased. Although the internal power dissipation is limited, the junc￾tion temperature must be kept below the maximum speci￾fied temperature (125§C) in order to meet data sheet specifi￾cations. To calculate the maximum junction temperature or heat sink required, the following thermal resistance values should be used: Typ Max Typ Max Package iJC iJC iJA iJA §C/W §C/W §C/W §C/W TO-220 3.0 5.0 60 40 PD MAX e TJ Max b TA iJC a iCA or TJ Max TA iJA iCA e iCS a iSA (without heat sink) Solving for TJ: TJ e TA a PD (iJC a iCA) or e TA a PDiJA (without heat sink) Where: TJ e Junction Temperature TA e Ambient Temperature PD e Power Dissipation iJA e Junction-to-Ambient Thermal Resistance iJC e Junction-to-Case Thermal Resistance iCA e Case-to-Ambient Thermal Resistance iCS e Case-to-Heat Sink Thermal Resistance iSA e Heat Sink-to-Ambient Thermal Resistance Typical Applications (Continued) Bypass capacitors are necessary for stable operation of the LM79XX series of regulators over the input voltage and out￾put current ranges. Output bypass capacitors will improve the transient response by the regulator. The bypass capacitors, (2.2 mF on the input, 1.0 mF on the output) should be ceramic or solid tantalum which have good high frequency characteristics. If aluminum electrolyt￾ics are used, their values should be 10 mF or larger. The bypass capacitors should be mounted with the shortest leads, and if possible, directly across the regulator termi￾nals. High Stability 1 Amp Regulator TL/H/7340 –5 Load and line regulation k 0.01% temperature stability s 0.2% ²Determine Zener current ² ²Solid tantalum *Select resistors to set output voltage. 2 ppm/§C tracking suggested 4

Typical Applications(Continued) Current Source 2,2HF Light Controller Using Silicon Photo Cell 千器 np brightness increase until in-io(= 1 mA)+5V/R1 nEcessary only if raw supply filter capacitor is more than 2 from LM7905CT

Typical Applications (Continued) Current Source *IOUT e 1 mA a 5V R1 TL/H/7340 –7 Light Controller Using Silicon Photo Cell TL/H/7340 –8 *Lamp brightness increase until iI e i Q (& 1 mA) a 5V/R1. ²Necessary only if raw supply filter capacitor is more than 2× from LM7905CT 5

Typical Applications(Continued) c LM7905 Lamp brightness increases until i- 5v/R1(h can be set as low as 1 HA) t15v, 1 Amp Tracking Regulators LM340T ouT(+)151 LM79 15CT vr(-)15v ssary only if raw supply filter capacitors are more than 3" from regu-

Typical Applications (Continued) High-Sensitivity Light Controller TL/H/7340 –9 *Lamp brightness increases until ii e 5V/R1 (Ii can be set as low as 1 mA) ²Necessary only if raw supply filter capacitor is more than 2× from LM7905 g15V, 1 Amp Tracking Regulators TL/H/7340 –1 (b15) (a15) Load Regulation at DIL e 1A 40 mV 2 mV Output Ripple, CIN e 3000 mF, IL e 1A 100 mVrms 100 mVrms Temperature Stability 50 mV 50 mV Output Noise 10 Hz s f s 10 kHz 150 mVrms 150 mVrms *Resistor tolerance of R4 and R5 determine matching of (a) and (b) outputs. **Necessary only if raw supply filter capacitors are more than 3× from regu￾lators. 6

Schematic diagram 是

Schematic Diagrams b5V TL/H/7340 –12 7

Schematic Diagrams (Continued) 是

Schematic Diagrams (Continued) b12V and b15V TL/H/7340 –13 8

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Physical Dimension 0.330-0.350 0o32z5E-aoE××巴E 5 0,190-0,2 0.048-0055 0.130-0.160 [1.22-1.40] PIN t 1 1D [3.30-4,06 1.005=1.035 (153556 015:0.061(0.3615 0.175-0.185 [4.45-4,70 0.048-0,052 SEATING PLANE TO-220 Outline Order Number LM7905CT. LM7912cT or LM7915CT NS Package Number To3B ATIONAL'S PRODUCTS VICES OR SYSTEMS WITHOUT TH AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPC THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATION SEMICONDUCTOR CORPORATION. As used herein Life support devices or systems are devices or 2. A critical component is any co systems which, (a) are intended for surgical implant support device or system, or to vith instructions for use provided in the labeling, can effectiveness. to result in a significant inju F5350 Natonal does not assume any sporeiN for use of any cicu try dcbad, no drmu patent lenses a mpod and National resorts tho at any io witout nonce o chango said cory and spoo cations

LM79XX Series 3-Terminal Negative Regulators Physical Dimensions inches (millimeters) TO-220 Outline Package (T) Order Number LM7905CT, LM7912CT or LM7915CT NS Package Number T03B LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or 2. A critical component is any component of a life systems which, (a) are intended for surgical implant support device or system whose failure to perform can into the body, or (b) support or sustain life, and whose be reasonably expected to cause the failure of the life failure to perform, when properly used in accordance support device or system, or to affect its safety or with instructions for use provided in the labeling, can effectiveness. be reasonably expected to result in a significant injury to the user. National Semiconductor National Semiconductor National Semiconductor National Semiconductor Corporation Europe Hong Kong Ltd. Japan Ltd. 1111 West Bardin Road Fax: ( a49) 0-180-530 85 86 13th Floor, Straight Block, Tel: 81-043-299-2309 Arlington, TX 76017 Email: cnjwge @tevm2.nsc.com Ocean Centre, 5 Canton Rd. Fax: 81-043-299-2408 Tel: 1(800) 272-9959 Deutsch Tel: ( a49) 0-180-530 85 85 Tsimshatsui, Kowloon Fax: 1(800) 737-7018 English Tel: ( a49) 0-180-532 78 32 Hong Kong Fran 3ais Tel: ( a49) 0-180-532 93 58 Tel: (852) 2737-1600 Italiano Tel: ( a49) 0-180-534 16 80 Fax: (852) 2736-9960 National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications