L78S15CV

L78S 2 A positive voltage regulator IC Datasheet - production data Description TO-220 Features • Output current up to 2 A • Output voltages of 5; 7.5; 9; 10; 12; 15; 18; 24 V The L78S series of three-terminal positive regulators is available in TO-220 package and several fixed output voltages, making it useful in a wide range of applications. These regulators can provide local on-card regulation, eliminating the distribution problems associated with single point regulation. Each type embeds internal current limiting, thermal shut-down and safe area protection, making it essentially indestructible. If adequate heat sinking is provided, they can deliver over 2 A output current. Although designed primarily as fixed voltage regulators, these devices can be used with external components to obtain adjustable voltages and currents. • Thermal protection • Short circuit protection • Output transition SOA protection Table 1. Device summary TO-220 packages Part numbers Output voltage Dual gauge Single gauge L78S05C L78S05CV-DG L78S05CV 5V L78S75C L78S75CV-DG L78S75CV 7.5 V L78S09C L78S09CV-DG L78S09CV 9V L78S10C L78S10CV-DG L78S10CV 10 V L78S12C L78S12CV-DG L78S12CV 12 V L78S15C L78S15CV-DG L78S15CV 15 V L78S18C L78S18CV 18 V L78S24C L78S24CV 24 V March 2014 This is information on a product in full production. DocID2148 Rev 8 1/35 www.st.com Contents L78S Contents 1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 4 Test circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 6 Typical performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 8 Packaging mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 2/35 DocID2148 Rev 8 L78S List of tables List of tables Table 1. Table 2. Table 3. Table 4. Table 5. Table 6. Table 7. Table 8. Table 9. Table 10. Table 11. Table 12. Table 13. Table 14. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Electrical characteristics of L78S05C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Electrical characteristics of L78S75C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Electrical characteristics of L78S09C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Electrical characteristics of L78S10C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Electrical characteristics of L78S12C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Electrical characteristics of L78S15C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Electrical characteristics of L78S18C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Electrical characteristics of L78S24C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 TO-220 (dual gauge) mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 TO-220 SG (single gauge) mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 DocID2148 Rev 8 3/35 35 List of figures L78S List of figures Figure 1. Figure 2. Figure 3. Figure 4. Figure 5. Figure 6. Figure 7. Figure 8. Figure 9. Figure 10. Figure 11. Figure 12. Figure 13. Figure 14. Figure 15. Figure 16. Figure 17. Figure 18. Figure 19. Figure 20. Figure 21. Figure 22. Figure 23. Figure 24. Figure 25. Figure 26. Figure 27. Figure 28. Figure 29. Figure 30. Figure 31. Figure 32. Figure 33. Figure 34. Figure 35. Figure 36. Figure 37. Figure 38. Figure 39. Figure 40. Figure 41. 4/35 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Pin connections (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Schematic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Application circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 DC parameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Load regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Ripple rejection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Dropout voltage vs. junction temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Peak output current vs. input/output differential voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Output impedance vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Output voltage vs. junction temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Supply voltage rejection vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Quiescent current vs. junction temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Load transient response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Line transient response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Quiescent current vs. input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Fixed output regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Constant current regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Circuit for increasing output voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Adjustable output regulator (7 to 30 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 0.5 to 10 V regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 High current voltage regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 High output current with short circuit protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Tracking voltage regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Positive and negative regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Negative output voltage circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Switching regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 High input voltage circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 High input voltage circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 High output voltage regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 High input and output voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Reducing power dissipation with dropping resistor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Remote shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Power AM modulator (unity voltage gain, IO £ 1 A) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Adjustable output voltage with temperature compensation . . . . . . . . . . . . . . . . . . . . . . . . 26 Light controllers (VOmin = VXX + VBE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Protection against input short-circuit with high capacitance loads . . . . . . . . . . . . . . . . . . . 27 TO-220 (dual gauge) drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 TO-220 SG (single gauge) drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Tube for TO-220 (dual gauge) (mm.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Tube for TO-220 (single gauge) (mm.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 DocID2148 Rev 8 L78S 1 Diagram Diagram Figure 1. Block diagram DocID2148 Rev 8 5/35 35 Pin configuration 2 L78S Pin configuration Figure 2. Pin connections (top view) *5281' 72 Figure 3. Schematic diagram 6/35 DocID2148 Rev 8 L78S 3 Maximum ratings Maximum ratings Table 2. Absolute maximum ratings Symbol Parameter Value for VO= 5 to 18V 35 for VO= 24V 40 VI DC input voltage IO Output current Internally limited PD Power dissipation Internally limited TSTG Storage temperature range TOP Operating junction temperature range Note: Unit V -65 to 150 °C 0 to 150 °C Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. Table 3. Thermal data Symbol Parameter TO-220 Unit RthJC Thermal resistance junction-case 5 °C/W RthJA Thermal resistance junction-ambient 50 °C/W Figure 4. Application circuits 4 DocID2148 Rev 8 7/35 35 Test circuits 4 L78S Test circuits Figure 5. DC parameter 4 Figure 6. Load regulation 4 Figure 7. Ripple rejection 4 8/35 DocID2148 Rev 8 L78S 5 Electrical characteristics Electrical characteristics Refer to the test circuits, TJ = 25 °C, VI = 10 V, IO = 500 mA, unless otherwise specified. Table 4. Electrical characteristics of L78S05C Symbol Parameter VO Output voltage VO Output voltage ΔVO Line regulation ΔVO Load regulation IQ ΔIQ ΔVO/ΔT eN Test conditions IO = 1 A, VI = 7 V Min. Typ. Max. Unit 4.8 5 5.2 V 4.75 5 5.25 V VI = 7 to 25 V 100 VI = 8 to 25 V 50 IO = 20 mA to 1.5 A 100 mV mV IO = 2 A 80 Quiescent current Quiescent current change 8 IO = 20 mA to 1 A 0.5 VI = 7 to 25 V, IO = 20 mA 1.3 Output voltage drift IO = 5 mA, TJ = 0 °C to 70 °C Output noise voltage B = 10 Hz to 100 kHz mA mA -1.1 mV/°C 40 µV 54(1) dB 8 V SVR Supply voltage rejection f = 120 Hz VI Operating input voltage IO ≤ 1 A RO Output resistance f = 1 kHz 17 mΩ Isc Short circuit current VI = 27 V 500 mA Iscp Short circuit peak current 3 A 1. Guaranteed by design. DocID2148 Rev 8 9/35 35 Electrical characteristics L78S Refer to the test circuits, TJ = 25 °C, VI = 12.5 V, IO = 500 mA, unless otherwise specified. Table 5. Electrical characteristics of L78S75C Symbol Parameter VO Output voltage VO Output voltage ΔVO Line regulation ΔVO Load regulation IQ ΔIQ ΔVO/ΔT eN Test conditions IO = 1 A, VI = 9.5 V Min. Typ. Max. Unit 7.15 7.5 7.9 V 7.1 7.5 7.95 V VI = 9.5 to 25 V 120 VI = 10.5 to 20 V 60 IO = 20 mA to 1.5 A 140 mV mV IO = 2 A 100 Quiescent current Quiescent current change 8 IO = 20 mA to 1 A 0.5 VI = 9.5 to 25 V, IO = 20 mA 1.3 Output voltage drift IO = 5 mA, TJ = 0 °C to 70 °C Output noise voltage B = 10 Hz to 100 kHz mA mA -0.8 mV/°C 52 µV SVR Supply voltage rejection f = 120 Hz 48(1) VI Operating input voltage IO ≤ 1 A 10.5 RO Output resistance f = 1 kHz 16 mΩ Isc Short circuit current VI = 27 V 500 mA Iscp Short circuit peak current 3 A 1. Guaranteed by design. 10/35 DocID2148 Rev 8 dB V L78S Electrical characteristics Refer to the test circuits, TJ = 25 °C, VI = 14 V, IO = 500 mA, unless otherwise specified. Table 6. Electrical characteristics of L78S09C Symbol Parameter VO Output voltage VO Output voltage ΔVO Line regulation ΔVO Load regulation IQ ΔIQ ΔVO/ΔT eN Test conditions IO = 1 A, VI = 11 V Min. Typ. Max. Unit 8.65 9 9.35 V 8.6 9 9.4 V VI = 11 to 25 V 130 VI = 11 to 20 V 65 IO = 20 mA to 1.5 A 170 mV mV IO = 2 A 100 Quiescent current Quiescent current change 8 IO = 20 mA to 1 A 0.5 VI = 11 to 25 V, IO = 20 mA 1.3 Output voltage drift IO = 5 mA, TJ = 0 °C to 70 °C Output noise voltage B = 10 Hz to 100 kHz mA mA -1 mV/°C 60 µV 47(1) dB 12 V SVR Supply voltage rejection f = 120 Hz VI Operating input voltage IO ≤ 1 A RO Output resistance f = 1 kHz 17 mΩ Isc Short circuit current VI = 27 V 500 mA Iscp Short circuit peak current 3 A 1. Guaranteed by design. DocID2148 Rev 8 11/35 35 Electrical characteristics L78S Refer to the test circuits, TJ = 25 °C, VI = 15 V, IO = 500 mA, unless otherwise specified. Table 7. Electrical characteristics of L78S10C Symbol Parameter VO Output voltage VO Output voltage ΔVO Line regulation ΔVO Load regulation IQ ΔIQ ΔVO/ΔT eN Test conditions IO = 1 A, VI = 12.5 V Min. Typ. Max. Unit 9.5 10 10.5 V 9.4 10 10.6 V VI = 12.5 to 30 V 200 VI = 14 to 22 V 100 IO = 20 mA to 1.5 A 240 mV mV IO = 2 A 150 Quiescent current Quiescent current change 8 IO = 20 mA to 1 A 0.5 mA VI = 12.5 to 30 V, IO = 20 mA Output voltage drift IO = 5 mA, TJ = 0 °C to 70 °C Output noise voltage B = 10 Hz to 100 kHz mA 1 -1 mV/°C 65 µV 47(1) dB 13 V SVR Supply voltage rejection f = 120 Hz VI Operating input voltage IO ≤ 1 A RO Output resistance f = 1 kHz 17 mΩ Isc Short circuit current VI = 27 V 500 mA Iscp Short circuit peak current 3 A 1. Guaranteed by design. 12/35 DocID2148 Rev 8 L78S Electrical characteristics Refer to the test circuits, TJ = 25 °C, VI = 19 V, IO = 500 mA, unless otherwise specified. Table 8. Electrical characteristics of L78S12C Symbol Parameter VO Output voltage VO Output voltage ΔVO Line regulation ΔVO Load regulation IQ ΔIQ ΔVO/ΔT eN Test conditions IO = 1 A, VI = 14.5 V Min. Typ. Max. Unit 11.5 12 12.5 V 11.4 12 12.6 V VI = 14.5 to 30 V 240 VI = 16 to 22 V 120 IO = 20 mA to 1.5 A 240 mV mV IO = 2 A 150 Quiescent current Quiescent current change 8 IO = 20 mA to 1 A 0.5 mA VI = 14.5 to 30 V, IO = 20 mA Output voltage drift IO = 5 mA, TJ = 0 °C to 70 °C Output noise voltage B =10 Hz to 100 kHz mA 1 -1 mV/°C 75 µV 47(1) dB 15 V SVR Supply voltage rejection f = 120 Hz VI Operating input voltage IO ≤ 1 A RO Output resistance f = 1 kHz 18 mΩ Isc Short circuit current VI = 27 V 500 mA Iscp Short circuit peak current 3 A 1. Guaranteed by design. DocID2148 Rev 8 13/35 35 Electrical characteristics L78S Refer to the test circuits, TJ = 25 °C, VI = 23 V, IO = 500 mA, unless otherwise specified. Table 9. Electrical characteristics of L78S15C Symbol Parameter VO Output voltage VO Output voltage ΔVO Line regulation ΔVO Load regulation IQ ΔIQ ΔVO/ΔT eN Test conditions IO = 1 A, VI = 17.5 V Min. Typ. Max. Unit 14.4 15 15.6 V 14.25 15 15.75 V VI = 17.5 to 30 V 300 VI = 20 to 26 V 150 IO = 20 mA to 1.5 A 300 mV mV IO = 2 A 150 Quiescent current Quiescent current change 8 IO = 20 mA to 1 A 0.5 mA VI = 17.5 to 30 V, IO = 20 mA Output voltage drift IO = 5 mA, TJ = 0 °C to 70 °C Output noise voltage B =10 Hz to 100 kHz mA 1 -1 mV/°C 90 µV 46(1) dB 18 V SVR Supply voltage rejection f = 120 Hz VI Operating input voltage IO ≤ 1 A RO Output resistance f = 1 kHz 19 mΩ Isc Short circuit current VI = 27 V 500 mA Iscp Short circuit peak current 3 A 1. Guaranteed by design. 14/35 DocID2148 Rev 8 L78S Electrical characteristics Refer to the test circuits, TJ = 25 °C, VI = 26 V, IO = 500 mA, unless otherwise specified. Table 10. Electrical characteristics of L78S18C Symbol Parameter VO Output voltage VO Output voltage ΔVO Line regulation ΔVO Load regulation IQ ΔIQ ΔVO/ΔT eN Test conditions IO = 1 A, VI = 20.5 V Min. Typ. Max. Unit 17.1 18 18.9 V 17 18 19 V VI = 20.5 to 30 V 360 VI = 22 to 28 V 180 IO = 20 mA to 1.5 A 360 mV mV IO = 2 A 200 Quiescent current Quiescent current change 8 IO = 20 mA to 1 A 0.5 mA VI = 20.5 to 30 V, IO = 20 mA Output voltage drift IO = 5 mA, TJ = 0 °C to 70 °C Output noise voltage B =10 Hz to 100 kHz mA 1 -1 mV/°C 110 µV 43(1) dB 21 V SVR Supply voltage rejection f = 120 Hz VI Operating input voltage IO ≤ 1 A RO Output resistance f = 1 kHz 22 mΩ Isc Short circuit current VI = 27 V 500 mA Iscp Short circuit peak current 3 A 1. Guaranteed by design. DocID2148 Rev 8 15/35 35 Electrical characteristics L78S Refer to the test circuits, TJ = 25 °C, VI = 33 V, IO = 500 mA, unless otherwise specified. Table 11. Electrical characteristics of L78S24C Symbol Parameter VO Output voltage VO Output voltage ΔVO Line regulation ΔVO Load regulation IQ ΔIQ ΔVO/ΔT eN Test conditions IO = 1 A, VI = 27 V Min. Typ. Max. Unit 23 24 25 V 22.8 24 25.2 V VI = 27 to 38 V 480 VI = 30 to 36 V 240 IO = 20 mA to 1.5 A 480 mV mV IO = 2 A 300 Quiescent current Quiescent current change 8 IO = 20 mA to 1 A 0.5 mA VI = 27 to 38 V, IO = 20 mA Output voltage drift IO = 5 mA, TJ = 0 °C to 70 °C Output noise voltage B = 10 Hz to 100 kHz mA 1 -1.5 mV/°C 170 µV 42(1) dB 27 V SVR Supply voltage rejection f = 120 Hz VI Operating input voltage IO ≤ 1 A RO Output resistance f = 1 kHz 28 mΩ Isc Short circuit current VI = 27 V 500 mA Iscp Short circuit peak current 3 A 1. Guaranteed by design. 16/35 DocID2148 Rev 8 L78S 6 Typical performance Typical performance Figure 8. Dropout voltage vs. junction temperature Figure 9. Peak output current vs. input/output differential voltage Figure 10. Output impedance vs. frequency Figure 11. Output voltage vs. junction temperature DocID2148 Rev 8 17/35 35 Typical performance L78S Figure 12. Supply voltage rejection vs. frequency Figure 13. Quiescent current vs. junction temperature Figure 14. Load transient response Figure 15. Line transient response Figure 16. Quiescent current vs. input voltage 18/35 DocID2148 Rev 8 L78S Typical performance Figure 17. Fixed output regulator   1. Although no output capacitor is need for stability, it does improve transient response. 2. Required if regulator is located an appreciable distance from power supply filter. Figure 18. Constant current regulator 4 ,2 9;;5,G Figure 19. Circuit for increasing output voltage 4 ,5 Ż,G 92 9;;55 ,G5 DocID2148 Rev 8 19/35 35 Typical performance L78S Figure 20. Adjustable output regulator (7 to 30 V) Figure 21. 0.5 to 10 V regulator VO=VXXR4/R1 20/35 DocID2148 Rev 8 L78S Typical performance Figure 22. High current voltage regulator 4 9%(4 5 BBBBBBBBBBBBBB ,5(4,4E4 9%(4 ,2 ,5(*4,5(*BBBBB B 5 Figure 23. High output current with short circuit protection 4 56& 9%( %(4 4,6& DocID2148 Rev 8 21/35 35 Typical performance L78S Figure 24. Tracking voltage regulator 4 Figure 25. Positive and negative regulator 22/35 DocID2148 Rev 8 L78S Typical performance Figure 26. Negative output voltage circuit Figure 27. Switching regulator Figure 28. High input voltage circuit 4 9,1 9,9 9=9%( DocID2148 Rev 8 23/35 35 Typical performance L78S Figure 29. High input voltage circuit 4 Figure 30. High output voltage regulator 4 Figure 31. High input and output voltage 4 92 9;;9= 24/35 DocID2148 Rev 8 L78S Typical performance Figure 32. Reducing power dissipation with dropping resistor 4 9,PLQ9;;9'523PD[ PD[ 5 BBBB BBBBBB BBBBBB BBBBBB BBBBBB BBBB ,2PD[ [,GPD[ PD[ Figure 33. Remote shutdown 4 DocID2148 Rev 8 25/35 35 Typical performance L78S Figure 34. Power AM modulator (unity voltage gain, IO ≤ 1 A) 4 Note: The circuit performs well up to 100 kHz. Figure 35. Adjustable output voltage with temperature compensation 4 92 9;;559%( Note: 26/35 Q2 is connected as a diode in order to compensate the variation of the Q1 VBE with the temperature. C allows a slow rise time of the VO. DocID2148 Rev 8 L78S Typical performance Figure 36. Light controllers (VOmin = VXX + VBE) 92ULVHVZKHQWKHOLJKWJRHVXS 92IDOOVZKHQWKHOLJKWJRHVXS Figure 37. Protection against input short-circuit with high capacitance loads 4 1. Application with high capacitance loads and an output voltage greater than 6 volts need an external diode (see Figure 30 on page 24) to protect the device against input short circuit. In this case the input voltage falls rapidly while the output voltage decrease slowly. The capacitance discharges by means of the BaseEmitter junction of the series pass transistor in the regulator. If the energy is sufficiently high, the transistor may be destroyed. The external diode by-passes the current from the IC to ground. DocID2148 Rev 8 27/35 35 Package mechanical data 7 L78S Package mechanical data In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK® packages, depending on their level of environmental compliance. ECOPACK® specifications, grade definitions and product status are available at: www.st.com. ECOPACK® is an ST trademark. 28/35 DocID2148 Rev 8 L78S Package mechanical data Figure 38. TO-220 (dual gauge) drawing BW\SH$B5HYB7 DocID2148 Rev 8 29/35 35 Package mechanical data L78S Table 12. TO-220 (dual gauge) mechanical data mm Dim. Min. Typ. A 4.40 4.60 b 0.61 0.88 b1 1.14 1.70 c 0.48 0.70 D 15.25 15.75 D1 30/35 Max. 1.27 E 10 10.40 e 2.40 2.70 e1 4.95 5.15 F 1.23 1.32 H1 6.20 6.60 J1 2.40 2.72 L 13 14 L1 3.50 3.93 L20 16.40 L30 28.90 ∅P 3.75 3.85 Q 2.65 2.95 DocID2148 Rev 8 L78S Package mechanical data Figure 39. TO-220 SG (single gauge) drawing BUHY' DocID2148 Rev 8 31/35 35 Package mechanical data L78S Table 13. TO-220 SG (single gauge) mechanical data mm Dim. Min. 32/35 Typ. Max. A 4.40 4.60 b 0.61 0.88 b1 1.14 1.70 c 0.48 0.70 D 15.25 15.75 E 10 10.40 e 2.40 2.70 e1 4.95 5.15 F 0.51 0.60 H1 6.20 6.60 J1 2.40 2.72 L 13 14 L1 3.50 3.93 L20 16.40 L30 28.90 ∅P 3.75 3.85 Q 2.65 2.95 DocID2148 Rev 8 L78S 8 Packaging mechanical data Packaging mechanical data Figure 40. Tube for TO-220 (dual gauge) (mm.) Figure 41. Tube for TO-220 (single gauge) (mm.) DocID2148 Rev 8 33/35 35 Revision history 9 L78S Revision history Table 14. Document revision history Date Revision 07-Sep-2006 2 Order codes updated. 20-Mar-2008 3 Added: Table 1 on page 1. 22-Mar-2010 4 Added: Table 20 on page 32, Figure 38 on page 33, Figure 39 on page 34, Figure 40 and Figure 41 on page 33. 08-Feb-2012 5 Added: order codes L78S05CV-DG, L78S12CV-DG and L78S15CV-DG Table 13 on page 35. 09-Mar-2012 6 Added: order codes L78S09CV-DG Table 13 on page 35. 15-May-2012 7 Added: order codes L78S75CV-DG and L78S10CV-DG Table 13 on page 35. 8 Part numbers L78Sxx and L78SxxC changed to L78S. Modified the title, the features and the description in cover page. Removed TO-3 package. Updated Table 1: Device summary, Section 2: Pin configuration, Section 3: Maximum ratings, Section 4: Test circuits, Section 5: Electrical characteristics,Section 6: Typical performance, Section 7: Package mechanical data, Section 9: Order codes. Added Section 8: Packaging mechanical data. Minor text changes. 10-Mar-2014 34/35 Changes DocID2148 Rev 8 L78S Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. 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