L78S00 SERIES 2A POSITIVE VOLTAGE REGULATORS .. .. . OUTPUT CURRENT TO 2A OUTPUT VOLTAGES OF 5 ; 7.5 ; 9 ; 10 ; 12 ; 15 ; 18 ; 24V THERMAL OVERLOAD PROTECTION SHORT CIRCUIT PROTECTION OUTPUT TRANSISTOR SOA PROTECTION DESCRIPTION The L78S00 series of three-terminal positive regulators is available in TO-220 and TO-3 packages and with 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 employs internal current limiting, thermal shut-down and safe area protection, making it essentially indestructible. If adequate heat sinking is provided, they can deliver over 2A output current. Although designed primarily as fixed voltage regulators, these devices can be used with external components to obtain adjustable voltages and currents. TO-3 TO-220 BLOCK DIAGRAM January 1993 1/21 L78S00 SERIES ABSOLUTE MAXIMUM RATINGS Symbol Parameter Vi DC Input Voltage (for V o = 5 to 18V) (for V o = 24V) Io Value Unit 35 40 V V Output Current Internally limited Pt o t Power Dissipation Internally limited T stg Storage Temperature – 65 to + 150 °C To p Operating Junction Temperature (for L78S00 ) (for L78S00C ) – 55 to + 150 0 to + 150 °C °C THERMAL DATA R t h j- cas e Thermal Resistance Junction-case R t h j -amb Thermal Resistance Junction-ambient Max Max TO-220 TO-3 3 50 4 35 °C/W °C/W CONNECTION DIAGRAMS AND ORDERING NUMBERS (top views) Type L78S05 L78S05C L78S75 L78S75C L78S09 L78S09C L78S10 L78S10C L78S12 L78S12C L78S15 L78S15C L78S18 L78S18C L78S24 L78S24C 2/21 T O- 22 0 L78S05CV L78S75CV L78S09CV L78S10CV L78S12CV L78S15CV L78S18CV L78S24CV TO-3 Output Voltage L78S05T L78S05CT L78S75T L78S75CT L78S09T L78S09CT L78S10T L78S10CT L78S12T L78S12CT L78S15T L78S15CT L78S18T L78S18CT L78S24T L78S24CT 5V 5V 7.5V 7.5V 9V 9V 10V 10V 12V 12V 15V 15V 18V 18V 24V 24V L78S00 SERIES APPLICATION CIRCUIT SCHEMATIC DIAGRAM 3/21 L78S00 SERIES TEST CIRCUITS Figure 1 : DC Parameters. Figure 3 : Ripple Rejection. 4/21 Figure 2 : Load Regulation. L78S00 SERIES ELECTRICAL CHARACTERISTICS FOR L78S05 (refer to the test circuits, Tj = 25 oC, Vi = 10V, Io = 500 mA unless otherwise specified) Symbol Parameter Test Conditions Min. Typ. Max. Unit 4.8 Vi = 7 V 4.75 5 5.2 V 5 5.25 V Vo Output Voltage Vo Output Voltage Io = 1 A ∆Vo Line Regulation Vi = 7 to 25 V Vi = 8 to 25 V 100 50 mV mV ∆Vo Load Regulation Io = 20 mA to 2 A 100 mV 8 mA Io = 20 mA to 1A 0.5 mA Id Quiescent Current ∆Id Quiescent Current Change ∆Id Quiescent Current Change Io = 20 mA Vi = 7 to 25 V ∆Vo ∆T Output Voltage Drift Io = 5 mA eN SVR 1.3 Tj = -55 to 150 oC Output Noise Voltage B = 10Hz to 100KHz Supply Voltage Rejection f = 120 Hz 60 8 mA mV/oC -1.1 µV 40 dB Vi Operating Input Voltage Io ≤ 1.5 A Ro Output Resistance f = 1KHz 17 mΩ Isc Short Circuit Current Vi = 27 V 500 mA Iscp Short Circuit Peack Current 3 A V o ELECTRICAL CHARACTERISTICS FOR L78S75 (refer to the test circuits, Tj = 25 C, Vi = 12.5V, Io = 500 mA unless otherwise specified) Symbol Parameter Test Conditions Min. Typ. Max. Unit 7.15 7.1 7.5 7.9 V 7.5 7.95 V Vo Output Voltage Vo Output Voltage Io = 1 A ∆Vo Line Regulation Vi = 9.5 to 25 V Vi = 10.5 to 20 V 120 60 mV mV ∆Vo Load Regulation Io = 20 mA to 2 A 120 mV 8 mA Io = 20 mA to 1A 0.5 mA Id Vi = 9.5 V Quiescent Current ∆Id Quiescent Current Change ∆Id Quiescent Current Change Io = 20 mA Vi = 9.5 to 25 V ∆Vo ∆T Output Voltage Drift Io = 5 mA eN SVR 1.3 Tj = -55 to 150 oC -0.8 Output Noise Voltage B = 10Hz to 100KHz Supply Voltage Rejection f = 120 Hz 54 52 10.5 mA mV/oC µV dB Vi Operating Input Voltage Io ≤ 1.5 A Ro Output Resistance f = 1KHz 16 mΩ Isc Short Circuit Current Vi = 27 V 500 mA Iscp Short Circuit Peack Current 3 A V 5/21 L78S00 SERIES ELECTRICAL CHARACTERISTICS FOR L78S09 (refer to the test circuits, Tj = 25 oC, Vi = 14V, Io = 500 mA unless otherwise specified) Symbol Parameter Test Conditions Min. Typ. Max. Unit 8.65 9 9.35 V 8.6 9 9.4 V Vo Output Voltage Vo Output Voltage Io = 1 A ∆Vo Line Regulation Vi = 11 to 25 V Vi = 11 to 20 V 130 65 mV mV ∆Vo Load Regulation Io = 20 mA to 2 A 130 mV 8 mA Io = 20 mA to 1A 0.5 mA Id Vi = 11 V Quiescent Current ∆Id Quiescent Current Change ∆Id Quiescent Current Change Io = 20 mA Vi = 11 to 25 V ∆Vo ∆T Output Voltage Drift Io = 5 mA eN SVR 1.3 Tj = -55 to 150 oC Output Noise Voltage B = 10Hz to 100KHz Supply Voltage Rejection f = 120 Hz 53 12 mA mV/oC -1 µV 60 dB Vi Operating Input Voltage Io ≤ 1.5 A Ro Output Resistance f = 1KHz 17 mΩ Isc Short Circuit Current Vi = 27 V 500 mA Iscp Short Circuit Peack Current 3 A V o ELECTRICAL CHARACTERISTICS FOR L78S10 (refer to the test circuits, Tj = 25 C, Vi = 15V, Io = 500 mA unless otherwise specified) Symbol Parameter Test Conditions Min. Typ. Max. Unit 9.5 10 10.5 V 9.4 10 10.6 V Vo Output Voltage Vo Output Voltage Io = 1 A ∆Vo Line Regulation Vi = 12.5 to 30 V Vi = 14 to 22 V 200 100 mV mV ∆Vo Load Regulation Io = 20 mA to 2 A 150 mV 8 mA Io = 20 mA to 1A 0.5 mA Id Vi = 12.5 V Quiescent Current ∆Id Quiescent Current Change ∆Id Quiescent Current Change Io = 20 mA Vi = 12.5 to 30 V ∆Vo ∆T Output Voltage Drift Io = 5 mA eN SVR 1 Tj = -55 to 150 oC -1 Output Noise Voltage B = 10Hz to 100KHz Supply Voltage Rejection f = 120 Hz 53 65 13 mA mV/oC µV dB Vi Operating Input Voltage Io ≤ 1.5 A Ro Output Resistance f = 1KHz 17 mΩ Isc Short Circuit Current Vi = 27 V 500 mA Iscp Short Circuit Peack Current 3 A 6/21 V L78S00 SERIES ELECTRICAL CHARACTERISTICS FOR L78S12 (refer to the test circuits, Tj = 25 oC, Vi = 19V, Io = 500 mA unless otherwise specified) Symbol Parameter Test Conditions Min. Typ. Max. Unit 11.5 12 12.5 V 11.4 12 12.6 V Vo Output Voltage Vo Output Voltage Io = 1 A ∆Vo Line Regulation Vi = 14.5 to 30 V Vi = 16 to 22 V 240 120 mV mV ∆Vo Load Regulation Io = 20 mA to 2 A 160 mV 8 mA Io = 20 mA to 1A 0.5 mA Id Vi = 14.5 V Quiescent Current ∆Id Quiescent Current Change ∆Id Quiescent Current Change Io = 20 mA Vi = 14.5 to 30 V ∆Vo ∆T Output Voltage Drift Io = 5 mA eN SVR 1 Tj = -55 to 150 oC Output Noise Voltage B = 10Hz to 100KHz Supply Voltage Rejection f = 120 Hz 53 15 mA mV/oC -1 µV 75 dB Vi Operating Input Voltage Io ≤ 1.5 A Ro Output Resistance f = 1KHz 18 mΩ Isc Short Circuit Current Vi = 27 V 500 mA Iscp Short Circuit Peack Current 3 A V o ELECTRICAL CHARACTERISTICS FOR L78S15 (refer to the test circuits, Tj = 25 C, Vi = 23V, Io = 500 mA unless otherwise specified) Symbol Parameter Test Conditions Min. Typ. Max. Unit 14.4 14.25 15 15.6 V 15 15.75 V Vo Output Voltage Vo Output Voltage Io = 1 A ∆Vo Line Regulation Vi = 17.5 to 30 V Vi = 20 to 26 V 300 150 mV mV ∆Vo Load Regulation Io = 20 mA to 2 A 180 mV 8 mA Io = 20 mA to 1A 0.5 mA Id Vi = 17.5 V Quiescent Current ∆Id Quiescent Current Change ∆Id Quiescent Current Change Io = 20 mA Vi = 17.5 to 30 V ∆Vo ∆T Output Voltage Drift Io = 5 mA eN SVR 1 Tj = -55 to 150 oC -1 Output Noise Voltage B = 10Hz to 100KHz Supply Voltage Rejection f = 120 Hz 52 90 18 mA mV/oC µV dB Vi Operating Input Voltage Io ≤ 1.5 A Ro Output Resistance f = 1KHz 19 mΩ Isc Short Circuit Current Vi = 27 V 500 mA Iscp Short Circuit Peack Current 3 A V 7/21 L78S00 SERIES ELECTRICAL CHARACTERISTICS FOR L78S18 (refer to the test circuits, Tj = 25 oC, Vi = 26V, Io = 500 mA unless otherwise specified) Symbol Parameter Test Conditions Min. Typ. Max. Unit 17.1 18 18.9 V 17 18 19 V Vo Output Voltage Vo Output Voltage Io = 1 A ∆Vo Line Regulation Vi = 20.5 to 30 V Vi = 22 to 28 V 360 180 mV mV ∆Vo Load Regulation Io = 20 mA to 2 A 200 mV 8 mA Io = 20 mA to 1A 0.5 mA Id Vi = 20.5 V Quiescent Current ∆Id Quiescent Current Change ∆Id Quiescent Current Change Io = 20 mA Vi = 22 to 33 V ∆Vo ∆T Output Voltage Drift Io = 5 mA eN SVR 1 Tj = -55 to 150 oC Output Noise Voltage B = 10Hz to 100KHz Supply Voltage Rejection f = 120 Hz 49 21 mA mV/oC -1 µV 110 dB Vi Operating Input Voltage Io ≤ 1.5 A Ro Output Resistance f = 1KHz 22 mΩ Isc Short Circuit Current Vi = 27 V 500 mA Iscp Short Circuit Peack Current 3 A V o ELECTRICAL CHARACTERISTICS FOR L78S24 (refer to the test circuits, Tj = 25 C, Vi = 33V, Io = 500 mA unless otherwise specified) Symbol Parameter Test Conditions Min. Typ. Max. Unit 23 Vi = 27 V 22.8 24 25 V 24 25.2 V Vo Output Voltage Vo Output Voltage Io = 1 A ∆Vo Line Regulation Vi = 27 to 38 V Vi = 30 to 36 V 480 240 mV mV ∆Vo Load Regulation Io = 20 mA to 2 A 250 mV 8 mA Io = 20 mA to 1A 0.5 mA Id Quiescent Current ∆Id Quiescent Current Change ∆Id Quiescent Current Change Io = 20 mA Vi = 8 to 25 V ∆Vo ∆T Output Voltage Drift Io = 5 mA eN SVR 1 Tj = -55 to 150 oC -1.5 Output Noise Voltage B = 10Hz to 100KHz Supply Voltage Rejection f = 120 Hz 48 170 27 mA mV/oC µV dB Vi Operating Input Voltage Io ≤ 1.5 A Ro Output Resistance f = 1KHz 23 mΩ Isc Short Circuit Current Vi = 27 V 500 mA Iscp Short Circuit Peack Current 3 A 8/21 V L78S00 SERIES ELECTRICAL CHARACTERISTICS FOR L78S05C (refer to the test circuits, Tj = 25 oC, Vi = 10V, Io = 500 mA unless otherwise specified) Symbol Parameter Test Conditions Min. Typ. 4.8 Vi = 7 V 4.75 Vo Output Voltage Vo Output Voltage Io = 1 A ∆Vo Line Regulation Vi = 7 to 25 V Vi = 8 to 12 V ∆Vo Load Regulation Io = 20 mA to 1.5 A Io = 2 A Id Max. Unit 5 5.2 V 5 5.25 V 100 50 mV mV 100 mV 8 mA 80 Quiescent Current ∆Id Quiescent Current Change Io = 20 mA to 1A 0.5 mA ∆Id Quiescent Current Change Io = 20 mA Vi = 7 to 25 V 1.3 mA ∆Vo ∆T eN SVR o Output Voltage Drift Io = 5 mA Tj = 0 to 70 C Output Noise Voltage B = 10Hz to 100KHz -1.1 mV/oC 40 µV Supply Voltage Rejection f = 120 Hz 54 dB Vi Operating Input Voltage Io ≤ 1.5 A 8 V Ro Output Resistance f = 1KHz 17 mΩ Isc Short Circuit Current Vi = 27 V 500 mA Iscp Short Circuit Peack Current 3 A o ELECTRICAL CHARACTERISTICS FOR L78S75C (refer to the test circuits, Tj = 25 C, Vi = 12.5V, Io = 500 mA unless otherwise specified) Symbol Parameter Test Conditions Vo Output Voltage Vo Output Voltage Io = 1 A ∆Vo Line Regulation Vi = 9.5 to 25 V Vi = 10.5 to 20 V ∆Vo Load Regulation Io = 20 mA to 1.5 A Io = 2 A Id Vi = 9.5 V Min. Typ. Max. Unit 7.15 7.1 7.5 7.9 V 7.5 7.95 V 120 60 mV mV 140 mV 8 mA 100 Quiescent Current ∆Id Quiescent Current Change Io = 20 mA to 1A 0.5 mA ∆Id Quiescent Current Change Io = 20 mA Vi = 9.5 to 25 V 1.3 mA ∆Vo ∆T eN SVR Output Voltage Drift Io = 5 mA Output Noise Voltage B = 10Hz to 100KHz o Tj = 0 to 70 C -0.8 mV/oC 52 µV Supply Voltage Rejection f = 120 Hz 48 dB Vi Operating Input Voltage Io ≤ 1.5 A 10.5 V Ro Output Resistance f = 1KHz 16 mΩ Isc Short Circuit Current Vi = 27 V 500 mA Iscp Short Circuit Peack Current 3 A 9/21 L78S00 SERIES ELECTRICAL CHARACTERISTICS FOR L78S09C (refer to the test circuits, Tj = 25 oC, Vi = 14V, Io = 500 mA unless otherwise specified) Symbol Parameter Test Conditions Vo Output Voltage Vo Output Voltage Io = 1 A ∆Vo Line Regulation Vi = 11 to 25 V Vi = 11 to 20 V ∆Vo Load Regulation Io = 20 mA to 1.5 A Io = 2 A Id Vi = 11 V Min. Typ. Max. Unit 8.65 9 9.35 V 8.6 9 9.4 V 130 65 mV mV 170 mV 8 mA 100 Quiescent Current ∆Id Quiescent Current Change Io = 20 mA to 1A 0.5 mA ∆Id Quiescent Current Change Io = 20 mA Vi = 11 to 25 V 1.3 mA ∆Vo ∆T eN SVR o Output Voltage Drift Io = 5 mA Tj = 0 to 70 C Output Noise Voltage B = 10Hz to 100KHz -1 mV/oC 60 µV Supply Voltage Rejection f = 120 Hz 47 dB Vi Operating Input Voltage Io ≤ 1.5 A 12 V Ro Output Resistance f = 1KHz 17 mΩ Isc Short Circuit Current Vi = 27 V 500 mA Iscp Short Circuit Peack Current 3 A o ELECTRICAL CHARACTERISTICS FOR L78S10C (refer to the test circuits, Tj = 25 C, Vi = 15V, Io = 500 mA unless otherwise specified) Symbol Parameter Test Conditions Vo Output Voltage Vo Output Voltage Io = 1 A ∆Vo Line Regulation Vi = 12.5 to 30 V Vi = 14 to 22 V ∆Vo Load Regulation Io = 20 mA to 1.5 A Io = 2 A Id Vi = 12.5 V Quiescent Current Change Io = 20 mA to 1A Quiescent Current Change Io = 20 mA Vi = 12.5 to 30 V SVR Max. Unit 9.5 10 10.5 V 9.4 10 10.6 V 200 100 mV mV 240 mV 8 mA 0.5 mA 1 mA Quiescent Current ∆Id eN Typ. 150 ∆Id ∆Vo ∆T Min. Output Voltage Drift Io = 5 mA Output Noise Voltage B = 10Hz to 100KHz o Tj = 0 to 70 C -1 mV/oC 65 µV Supply Voltage Rejection f = 120 Hz 47 dB Vi Operating Input Voltage Io ≤ 1.5 A 13 V Ro Output Resistance f = 1KHz 17 mΩ Isc Short Circuit Current Vi = 27 V 500 mA Iscp Short Circuit Peack Current 3 A 10/21 L78S00 SERIES ELECTRICAL CHARACTERISTICS FOR L78S12C (refer to the test circuits, Tj = 25 oC, Vi = 19V, Io = 500 mA unless otherwise specified) Symbol Parameter Test Conditions Vo Output Voltage Vo Output Voltage Io = 1 A ∆Vo Line Regulation Vi = 14.5 to 30 V Vi = 16 to 22 V ∆Vo Load Regulation Io = 20 mA to 1.5 A Io = 2 A Id Vi = 14.5 V Quiescent Current Change Io = 20 mA to 1A Quiescent Current Change Io = 20 mA Vi = 14.5 to 30 V SVR Max. Unit 11.5 12 12.5 V 11.4 12 12.6 V 240 120 mV mV 240 mV 8 mA 0.5 mA 1 mA Quiescent Current ∆Id eN Typ. 150 ∆Id ∆Vo ∆T Min. o Output Voltage Drift Io = 5 mA Tj = 0 to 70 C Output Noise Voltage B = 10Hz to 100KHz -1 mV/oC 75 µV Supply Voltage Rejection f = 120 Hz 47 dB Vi Operating Input Voltage Io ≤ 1.5 A 15 V Ro Output Resistance f = 1KHz 18 mΩ Isc Short Circuit Current Vi = 27 V 500 mA Iscp Short Circuit Peack Current 3 A o ELECTRICAL CHARACTERISTICS FOR L78S15C (refer to the test circuits, Tj = 25 C, Vi = 23V, Io = 500 mA unless otherwise specified) Symbol Parameter Test Conditions Vo Output Voltage Vo Output Voltage Io = 1 A ∆Vo Line Regulation Vi = 17.5 to 30 V Vi = 20 to 26 V ∆Vo Load Regulation Io = 20 mA to 1.5 A Io = 2 A Id Vi = 17.5 V Quiescent Current Change Io = 20 mA to 1A Quiescent Current Change Io = 20 mA Vi = 17.5 to 30 V SVR Max. Unit 14.4 14.25 15 15.6 V 15 15.75 V 300 150 mV mV 300 mV 8 mA 0.5 mA 1 mA Quiescent Current ∆Id eN Typ. 150 ∆Id ∆Vo ∆T Min. Output Voltage Drift Io = 5 mA Output Noise Voltage B = 10Hz to 100KHz o Tj = 0 to 70 C -1 mV/oC 90 µV Supply Voltage Rejection f = 120 Hz 46 dB Vi Operating Input Voltage Io ≤ 1.5 A 18 V Ro Output Resistance f = 1KHz 19 mΩ Isc Short Circuit Current Vi = 27 V 500 mA Iscp Short Circuit Peack Current 3 A 11/21 L78S00 SERIES ELECTRICAL CHARACTERISTICS FOR L78S18C (refer to the test circuits, Tj = 25 oC, Vi = 26V, Io = 500 mA unless otherwise specified) Symbol Parameter Test Conditions Vo Output Voltage Vo Output Voltage Io = 1 A ∆Vo Line Regulation Vi = 20.5 to 30 V Vi = 22 to 28 V ∆Vo Load Regulation Io = 20 mA to 1.5 A Io = 2 A Id Vi = 20.5 V Quiescent Current Change Io = 20 mA to 1A Quiescent Current Change Io = 20 mA Vi = 20.5 to 30 V SVR Max. Unit 17.1 18 18.9 V 17 18 19 V 360 180 mV mV 360 mV 8 mA 0.5 mA 1 mA Quiescent Current ∆Id eN Typ. 200 ∆Id ∆Vo ∆T Min. o Output Voltage Drift Io = 5 mA Tj = 0 to 70 C Output Noise Voltage B = 10Hz to 100KHz -1 mV/oC 110 µV Supply Voltage Rejection f = 120 Hz 43 dB Vi Operating Input Voltage Io ≤ 1.5 A 21 V Ro Output Resistance f = 1KHz 22 mΩ Isc Short Circuit Current Vi = 27 V 500 mA Iscp Short Circuit Peack Current 3 A o ELECTRICAL CHARACTERISTICS FOR L78S24C (refer to the test circuits, Tj = 25 C, Vi = 33V, Io = 500 mA unless otherwise specified) Symbol Parameter Test Conditions Min. Typ. 23 Vi = 27 V 22.8 Vo Output Voltage Vo Output Voltage Io = 1 A ∆Vo Line Regulation Vi = 27 to 38 V Vi = 30 to 36 V ∆Vo Load Regulation Io = 20 mA to 1.5 A Io = 2 A Id Quiescent Current Change Io = 20 mA to 1A Quiescent Current Change Io = 20 mA Vi = 27 to 38 V SVR 24 25 V 24 25.2 V 480 240 mV mV 480 mV 8 mA 0.5 mA 1 mA Quiescent Current ∆Id eN Unit 300 ∆Id ∆Vo ∆T Max. Output Voltage Drift Io = 5 mA Output Noise Voltage B = 10Hz to 100KHz o Tj = 0 to 70 C -1.5 mV/oC 170 µV Supply Voltage Rejection f = 120 Hz 42 dB Vi Operating Input Voltage Io ≤ 1.5 A 27 V Ro Output Resistance f = 1KHz 28 mΩ Isc Short Circuit Current Vi = 27 V 500 mA Iscp Short Circuit Peack Current 3 A 12/21 L78S00 SERIES Figure 4 : Dropout Voltage vs. Junction Temperature. Figure 5 : Peak Output Current vs. Input/Output Differential Voltage. Figure 6 : Supply Voltage Rejection vs. Frequency. Figure 7 : Output Voltage vs. Junction Temperature. Figure 8 : Output Impedance vs. Frequency. Figure 9 : Quiescent Current vs. Junction Temperature. 13/21 L78S00 SERIES Figure 10 : Load Transient Response. Figure 11 : Line Transient Response. Figure 12 : Quiescent Current vs. Input Voltage. Figure 13 : Fixed Output Regulator. Figure 14 : Constant Current Regulator. IO = Notes : 1. 2. 3. 14/21 To specify an output voltage, substitute voltage value for ”XX”. Although no output capacitor is needed for stabili ty, it does improve transient response. Required if regulator is located an appreciable dis-tance from power supply filter. VXX R1 + Id L78S00 SERIES Figure 15 : Circuit for Increasing Output Voltage. Figure 16 : Adjustable Output Regulator (7 to 30V). IR1 ≥ 5 Id V0 = VXX (1 + R2 R1 ) + Id R2 Figure 17 : 0.5 to 10V Regulator. Figure 18 : High Current Voltage Regulator. R1 = IREQ – VO = VXX R4 R1 IQ1 βQ1 IO = IREG + Q1 [IREG – Figure 19 : High Output Current with Short Circuit Protection. RSC = VBEQ1 VBEQ1 R1 ] Figure 20 : Tracking Voltage Regulator. VBEQ2 ISC 15/21 L78S00 SERIES Figure 21 : Positive and Negative Regulator. Figure 22 : Negative Output Voltage Circuit. (*) D1 and D 2 are necessary if the load is connected between + V0 and – V0. Figure 23 : Switching Regulator. Figure 24 : High Input Voltage Circuit. VIN = Vi – (VZ + VBE) Figure 25 : High Input Voltage Circuit. VIN = VZ - VBE 16/21 Figure 26 : High Output VoltageRegulator. L78S00 SERIES Figure 27 : High Input and Output Voltage. Figure 28 : Reducing Power Dissipation with Dropping Resistor. R= VO = VXX + VZ1 Figure 29 : Remote Shuntdown. Vi(min) – VXX – VDROP(max) IO(max) + Id(max) Figure 30 : Power AM Modulator (unity voltage gain, Io ≤ 1A). Note : The circuit performs well up to 100KHz. Figure 31 : Adjustable Output Voltage with Temperature Compensation. VO = VXX (1 + R2 ) + VBE R1 Note :Q 2 is connected as a diode in order to compensat e the vari ati on of the Q 1 VBE wi th the temperature. C all ows a slow rise-t ime of the V O 17/21 L78S00 SERIES Figure 32 : Light Controllers (Vo min = Vxx + VBE). VO falls when the light goes up Figure 33 : Protection against Input Short-circuit with High Capacitance Loads. Applications with high capacitance loads and an output voltage greater than 6 volts need an external diode (see fig. 33) to protect the device against input short circuit. In this case the input voltage falls rapidly while the output voltage decreases showly. 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 bypasses the current from the IC to ground. 18/21 VO rises when the light goes up L78S00 SERIES TO-3 MECHANICAL DATA mm DIM. MIN. inch TYP. MAX. MIN. TYP. MAX. A 11.00 13.10 0.433 0.516 B 0.97 1.15 0.038 0.045 C 1.50 1.65 0.059 0.065 D 8.32 8.92 0.327 0.351 E 19.00 20.00 0.748 0.787 G 10.70 11.10 0.421 0.437 N 16.50 17.20 0.649 0.677 P 25.00 26.00 0.984 1.023 R 4.00 4.09 0.157 0.161 U 38.50 39.30 1.515 1.547 V 30.00 30.30 1.187 1.193 A P C O N B V E G U D R P003F 19/21 L78S00 SERIES TO-220 MECHANICAL DATA mm DIM. MIN. inch MAX. MIN. A 4.40 TYP. 4.60 0.173 0.181 C 1.23 1.32 0.048 0.051 D 2.40 2.72 0.094 D1 TYP. MAX. 0.107 1.27 0.050 E 0.49 0.70 0.019 0.027 F 0.61 0.88 0.024 0.034 F1 1.14 1.70 0.044 0.067 F2 1.14 1.70 0.044 0.067 G 4.95 5.15 0.194 0.203 G1 2.4 2.7 0.094 0.106 H2 10.0 10.40 0.393 L2 0.409 16.4 0.645 13.0 14.0 0.511 0.551 L5 2.65 2.95 0.104 0.116 L6 15.2 15.9 0.598 0.625 L7 6.2 6.6 0.244 0.260 L9 3.5 4.2 0.137 0.165 DIA. 3.75 3.85 0.147 0.151 D1 C D A E L4 H2 G G1 F1 L2 F2 F Dia. L5 L9 L7 L6 L4 P011C 20/21 L78S00 SERIES Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsability for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may results from its use. No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use ascritical components in life support devices or systems without express written approval of SGS-THOMSON Microelectonics. 1994 SGS-THOMSON Microelectronics - All Rights Reserved SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A 21/21