STC7800 Series http://onsemi.com 1.0 A Positive Voltage Regulators TO−220 T SUFFIX CASE 221A These voltage regulators are monolithic integrated circuits designed as fixed−voltage regulators for a wide variety of applications including local, on−card regulation. These regulators employ internal current limiting, thermal shutdown, and safe−area compensation. With adequate heatsinking they can deliver output currents in excess of 1.0 A. Although designed primarily as a fixed voltage regulator, these devices can be used with external components to obtain adjustable voltages and currents. • Output Current in Excess of 1.0 A • No External Components Required • Internal Thermal Overload Protection • Internal Short Circuit Current Limiting • Output Transistor Safe−Area Compensation • Output Voltage Offered in 2% and 4% Tolerance • Available in Surface Mount D2PAK, DPAK and Standard 3−Lead Transistor Packages • NCV Prefix for Automotive and Other Applications Requiring Site and Control Changes • Pb−Free Packages are Available MAXIMUM RATINGS (TA = 25°C, unless otherwise noted) Rating Input Voltage (5.0 − 18 V) ) Power Dissipation Symbol Value Unit VI 35 40 Vdc PD Internally Limited W Thermal Resistance, Junction−to−Ambient RqJA 92 65 Figure 14 °C/W Thermal Resistance, Junction−to−Case RqJC 5.0 5.0 5.0 °C/W Storage Junction Temperature Range Tstg −65 to +150 °C Operating Junction Temperature TJ +150 °C 1 2 Heatsink surface connected to Pin 2. 3 4 11 2 Pin 1. Input 2. Ground 3. Output D2PAK D2T SUFFIX CASE 936 33 Heatsink surface (shown as terminal 4 in case outline drawing) is connected to Pin 2. 4 DPAK DT SUFFIX CASE 369C 1 2 3 STANDARD APPLICATION Input Cin* 0.33 mF STC78XX Output CO** A common ground is required between the input and the output voltages. The input voltage must remain typically 2.0 V above the output voltage even during the low point on the input ripple voltage. XX, These two digits of the type number indicate nominal voltage. * Cin is required if regulator is located an appreciable distance from power supply filter. ** CO is not needed for stability; however, it does improve transient response. Values of less than 0.1 mF could cause instability. ORDERING INFORMATION Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied, damage may occur and reliability may be affected. NOTE: ESD data available upon request. 1 See detailed ordering and shipping information in the package dimensions section on page 21 of this data sheet. DEVICE MARKING INFORMATION See general marking information in the device marking section on page 25 of this data sheet. STC7800 Series Vin MC7800 STC7800 R24 50 D2 Zener LAT 3 A Q18 LAT Q17 Q19 QNPN C3 R19 27.5 k Q20 QNPN 1.0 P R14 1.0 k Q10 QNPN R18 100 k R21 600 R22 100 Q7 QNPN R15 680 R23 0.2 Vout 5.01 Q5 QNPN 2 R17 9.0 k Q9 QNPN 2 R11 15 k Q6 QNPN D1 Zener R30 18 k Q12 QNPN Q15 QNPN R1 10.66 k R16 600 R20 17500 Q8 QNPN R2 1.56 k Q1 C2 3.0 P R10 3340−(3316ACT) R9 3.0 k R5 4.5 k Q14 QNPN Sense N+ QNPN 6 SUB Q11 2 C1 30 P Q4 QNPN Q13 QNPN Q3 QNPN Q2 Q16 QNPN 4 Diode R6 1.0 k R7 14 k R3 1.8 k R8 5.0 k This device contains 22 active transistors. Figure 1. Representative Schematic Diagram 2 R12 3.0 k R29 9.0 k R25 6.0 k R28 9.0 k R26 3.0 k R27 9.0 k R13 11660 STC7800 Series ELECTRICAL CHARACTERISTICS (Vin = 10 V, IO = 1.0 A, TJ = Tlow to Thigh (Note 1), unless otherwise noted) STC7805 Characteristic Symbol Min Typ Max Unit Output Voltage (TJ = 25°C) VO 4.9 5.0 5.1 Vdc Output Voltage (5.0 mA ≤ IO ≤ 1.0 A, PD ≤ 15 W) 7.5 Vdc ≤ Vin ≤ 20 Vdc VO 4.8 5.0 5.2 Vdc Line Regulation (Note 2) Regline mV 7.5 Vdc ≤ Vin ≤ 25 Vdc, IO = 500 mA − 0.5 10 8.0 Vdc ≤ Vin ≤ 12 Vdc, IO = 1.0 A − 0.8 12 8.0 Vdc ≤ Vin ≤ 12 Vdc, IO = 1.0 A, TJ = 25°C − 1.3 4.0 − 4.5 10 7.3 Vdc ≤ Vin ≤ 20 Vdc, IO = 1.0 A, TJ = 25°C Load Regulation (Note 2) Regload mV 5.0 mA ≤ IO ≤ 1.5 A, TJ = 25°C − 1.3 25 5.0 mA ≤ IO ≤ 1.0 A − 0.8 25 250 mA ≤ IO ≤ 750 mA − 0.53 15 − 3.2 6.0 Quiescent Current IB DIB Quiescent Current Change mA mA 8.0 Vdc ≤ Vin ≤ 25 Vdc, IO = 500 mA − 0.3 0.8 7.5 Vdc ≤ Vin ≤ 20 Vdc, TJ = 25°C − − 0.8 5.0 mA ≤ IO ≤ 1.0 A − 0.08 0.5 RR 68 83 − dB VI − VO − 2.0 − Vdc Output Noise Voltage (TA = 25°C) 10 Hz ≤ f ≤ 100 kHz Vn − 10 − mV/VO Output Resistance (f = 1.0 kHz) rO − 0.9 − mW Short Circuit Current Limit (TA = 25°C) Vin = 35 Vdc ISC − 0.2 − A Peak Output Current (TJ = 25°C) Imax − 2.2 − A TCVO − −0.3 − mV/°C Ripple Rejection 8.0 Vdc ≤ Vin ≤ 18 Vdc, f = 120 Hz, IO = 500 mA Dropout Voltage (IO = 1.0 A, TJ = 25°C) Average Temperature Coefficient of Output Voltage 1. Tlow = 0°C for STC7800 Series Thigh = +125°C for STC7800 Series = *40°C for STC7800 Series 2. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account separately. Pulse testing with low duty cycle is used. 3 STC7800 Series ELECTRICAL CHARACTERISTICS (Vin = 11 V, IO = 1.0 A, TJ = Tlow to Thigh (Note 3), unless otherwise noted) STC7806 Characteristic Symbol Min Typ Max Unit Output Voltage (TJ = 25°C) VO 5.88 6.0 6.12 Vdc Output Voltage (5.0 mA ≤ IO ≤ 1.0 A, PD ≤ 15 W) VO 5.76 6.0 6.24 Vdc 8.6 Vdc ≤ Vin ≤ 21 Vdc Line Regulation (Note 4) Regline mV 8.6 Vdc ≤ Vin ≤ 25 Vdc, IO = 500 mA − 5.0 12 9.0 Vdc ≤ Vin ≤ 13 Vdc, IO = 1.0 A − 1.4 15 Load Regulation (Note 4) Regload mV 5.0 mA ≤ IO ≤ 1.5 A, TJ = 25°C − 1.3 25 5.0 mA ≤ IO ≤ 1.0 A − 0.9 25 250 mA ≤ IO ≤ 750 mA − 0.2 15 − 3.3 6.0 Quiescent Current IB DIB Quiescent Current Change mA mA 9.0 Vdc ≤ Vin ≤ 25 Vdc, IO = 500 mA − − 0.8 9.0 Vdc ≤ Vin ≤ 21 Vdc, IO = 1.0 A, TJ = 25°C − − 0.8 5.0 mA ≤ IO ≤ 1.0 A − − 0.5 RR 58 65 − dB VI − VO − 2.0 − Vdc Vn − 10 − mV/VO Output Resistance (f = 1.0 kHz) rO − 0.9 − mW Short Circuit Current Limit (TA = 25°C) ISC − 0.2 − A Imax − 2.2 − A TCVO − −0.3 − mV/°C Ripple Rejection 9.0 Vdc ≤ Vin ≤ 19 Vdc, f = 120 Hz, IO = 500 mA Dropout Voltage (IO = 1.0 A, TJ = 25°C) Output Noise Voltage (TA = 25°C) 10 Hz ≤ f ≤ 100 kHz Vin = 35 Vdc Peak Output Current (TJ = 25°C) Average Temperature Coefficient of Output Voltage 3. Tlow = 0°C for STC7800 Series Thigh = +125°C for STC7800 Series = *40°C for STC7800 Series 4. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account separately. Pulse testing with low duty cycle is used. 4 STC7800 Series ELECTRICAL CHARACTERISTICS (Vin = 14 V, IO = 1.0 A, TJ = Tlow to Thigh (Note 5), unless otherwise noted) STC7808 Characteristic Symbol Min Typ Max Unit Output Voltage (TJ = 25°C) VO 7.84 8.0 8.16 Vdc Output Voltage (5.0 mA ≤ IO ≤ 1.0 A, PD ≤ 15 W) 10.6 Vdc ≤ Vin ≤ 23 Vdc VO 7.7 8.0 8.3 Vdc − − − 6.0 1.7 5.0 15 18 15 − − − 1.4 1.0 0.22 25 25 15 − 3.3 6.0 − − − − − − 0.8 0.8 0.5 Line Regulation (Note 6) 10.6 Vdc ≤ Vin ≤ 25 Vdc, IO = 500 mA 11 Vdc ≤ Vin ≤ 17 Vdc, IO = 1.0 A 10.4 Vdc ≤ Vin ≤ 23 Vdc, TJ = 25°C Regline Load Regulation (Note 6) 5.0 mA ≤ IO ≤ 1.5 A, TJ = 25°C 5.0 mA ≤ IO ≤ 1.0 A 250 mA ≤ IO ≤ 750 mA Regload Quiescent Current IB mV mV mA Quiescent Current Change 11 Vdc ≤ Vin ≤ 25 Vdc, IO = 500 mA 10.6 Vdc ≤ Vin ≤ 23 Vdc, IO = 1.0 A, TJ = 25°C 5.0 mA ≤ IO ≤ 1.0 A DIB Ripple Rejection 11.5 Vdc ≤ Vin ≤ 21.5 Vdc, f = 120 Hz, IO = 500 mA RR 56 62 − dB VI − VO − 2.0 − Vdc Output Noise Voltage (TA = 25°C) 10 Hz ≤ f ≤ 100 kHz Vn − 10 − mV/VO Output Resistance f = 1.0 kHz rO − 0.9 − mW Short Circuit Current Limit (TA = 25°C) Vin = 35 Vdc ISC − 0.2 − A Peak Output Current (TJ = 25°C) Imax − 2.2 − A TCVO − −0.4 − mV/°C Dropout Voltage (IO = 1.0 A, TJ = 25°C) Average Temperature Coefficient of Output Voltage mA 5. Tlow = 0°C for STC7800 Series Thigh = +125°C for STC7800 Series = *40°C for STC7800 Series 6. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account separately. Pulse testing with low duty cycle is used. 5 STC7800 Series ELECTRICAL CHARACTERISTICS (Vin = 19 V, IO = 1.0 A, TJ = Tlow to Thigh (Note 7), unless otherwise noted) STC7812 Characteristic Symbol Min Typ Max Unit Output Voltage (TJ = 25°C) VO 11.75 12 12.25 Vdc Output Voltage (5.0 mA ≤ IO ≤ 1.0 A, PD ≤ 15 W) VO 11.5 12 12.5 Vdc 14.8 Vdc ≤ Vin ≤ 27 Vdc Line Regulation (Note 8) Regline mV 14.8 Vdc ≤ Vin ≤ 30 Vdc, IO = 500 mA − 3.8 18 16 Vdc ≤ Vin ≤ 22 Vdc, IO = 1.0 A − 2.2 20 14.5 Vdc ≤ Vin ≤ 27 Vdc, TJ = 25°C − 6.0 120 5.0 mA ≤ IO ≤ 1.5 A, TJ = 25°C − − 25 5.0 mA ≤ IO ≤ 1.0 A − − 25 − 3.4 6.0 Load Regulation (Note 8) Regload Quiescent Current IB mV DIB Quiescent Current Change mA mA 15 Vdc ≤ Vin ≤ 30 Vdc, IO = 500 mA − − 0.8 14.8 Vdc ≤ Vin ≤ 27 Vdc, TJ = 25°C − − 0.8 5.0 mA ≤ IO ≤ 1.0 A, TJ = 25°C − − 0.5 RR 55 60 − dB VI − VO − 2.0 − Vdc Vn − 10 − mV/VO Output Resistance (f = 1.0 kHz) rO − 1.1 − mW Short Circuit Current Limit (TA = 25°C) ISC − 0.2 − A Imax − 2.2 − A TCVO − −0.8 − mV/°C Ripple Rejection 15 Vdc ≤ Vin ≤ 25 Vdc, f = 120 Hz, IO = 500 mA Dropout Voltage (IO = 1.0 A, TJ = 25°C) Output Noise Voltage (TA = 25°C) 10 Hz ≤ f ≤ 100 kHz Vin = 35 Vdc Peak Output Current (TJ = 25°C) Average Temperature Coefficient of Output Voltage 7. Tlow = 0°C for STC7800 Series Thigh = +125°C for STC7800 Series = *40°C for STC7800 Series 8. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account separately. Pulse testing with low duty cycle is used. 6 STC7800 Series ELECTRICAL CHARACTERISTICS (Vin = 23 V, IO = 1.0 A, TJ = Tlow to Thigh (Note 9), unless otherwise noted) MC78MC7815 Characteristic Symbol Min Typ Max Unit Output Voltage (TJ = 25°C) VO 14.7 15 15.3 Vdc Output Voltage (5.0 mA ≤ IO ≤ 1.0 A, PD ≤ 15 W) VO 14.4 15 15.6 Vdc 17.9 Vdc ≤ Vin ≤ 30 Vdc Line Regulation (Note 10) Regline mV 17.9 Vdc ≤ Vin ≤ 30 Vdc, IO = 500 mA − 8.5 20 20 Vdc ≤ Vin ≤ 26 Vdc − 3.0 22 17.5 Vdc ≤ Vin ≤ 30 Vdc, IO = 1.0 A, TJ = 25°C − 7.0 20 5.0 mA ≤ IO ≤ 1.5 A, TJ = 25°C − 1.8 25 5.0 mA ≤ IO ≤ 1.0 A − 1.5 25 250 mA ≤ IO ≤ 750 mA − 1.2 15 − 3.5 6.0 Load Regulation (Note 10) Regload Quiescent Current IB mV DIB Quiescent Current Change mA mA 17.5 Vdc ≤ Vin ≤ 30 Vdc, IO = 500 mA − − 0.8 17.5 Vdc ≤ Vin ≤ 30 Vdc, IO = 1.0 A, TJ = 25°C − − 0.8 5.0 mA ≤ IO ≤ 1.0 A − − 0.5 RR 60 80 − dB VI − VO − 2.0 − Vdc Vn − 10 − mV/VO Output Resistance f = 1.0 kHz rO − 1.2 − mW Short Circuit Current Limit (TA = 25°C) ISC − 0.2 − A Imax − 2.2 − A TCVO − −1.0 − mV/°C Ripple Rejection 18.5 Vdc ≤ Vin ≤ 28.5 Vdc, f = 120 Hz, IO = 500 mA Dropout Voltage (IO = 1.0 A, TJ = 25°C) Output Noise Voltage (TA = 25°C) 10 Hz ≤ f ≤ 100 kHz Vin = 35 Vdc Peak Output Current (TJ = 25°C) Average Temperature Coefficient of Output Voltage 9. Tlow = 0°C for STC7800 Series Thigh = +125°C for STC7800 Series = *40°C for STC7800 Series 10. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account separately. Pulse testing with low duty cycle is used. 7 STC7800 Series ELECTRICAL CHARACTERISTICS (Vin = 27 V, IO = 1.0 A, TJ = Tlow to Thigh (Note 11), unless otherwise noted) STC7818 Characteristic Symbol Min Typ Max Unit Output Voltage (TJ = 25°C) VO 17.64 18 18.36 Vdc Output Voltage (5.0 mA ≤ IO ≤ 1.0 A, PD ≤ 15 W) VO 17.3 18 18.7 Vdc 21 Vdc ≤ Vin ≤ 33 Vdc Line Regulation (Note 12) Regline mV 21 Vdc ≤ Vin ≤ 33 Vdc, IO = 500 mA − 9.5 22 24 Vdc ≤ Vin ≤ 30 Vdc, IO = 1.0 A − 3.2 25 24 Vdc ≤ Vin ≤ 30 Vdc, IO = 1.0 A, TJ = 25°C − 3.2 10.5 − 8.0 22 20.6 Vdc ≤ Vin ≤ 33 Vdc, IO = 1.0 A, TJ = 25°C Load Regulation (Note 12) Regload mV 5.0 mA ≤ IO ≤ 1.5 A, TJ = 25°C − 2.0 25 5.0 mA ≤ IO ≤ 1.0 A − 1.8 25 250 mA ≤ IO ≤ 750 mA − 1.5 15 − 3.5 6.0 21 Vdc ≤ Vin ≤ 33 Vdc, IO = 500 mA − − 0.8 21.5 Vdc ≤ Vin ≤ 30 Vdc, TJ = 25°C − − 0.8 5.0 mA ≤ IO ≤ 1.0 A − − 0.5 RR 53 57 − dB VI − VO − 2.0 − Vdc Vn − 10 − mV/VO Output Resistance f = 1.0 kHz rO − 1.3 − mW Short Circuit Current Limit (TA = 25°C) ISC − 0.2 − A Imax − 2.2 − A TCVO − −1.5 − mV/°C Quiescent Current IB DIB Quiescent Current Change Ripple Rejection mA mA 22 Vdc ≤ Vin ≤ 32 Vdc, f = 120 Hz, IO = 500 mA Dropout Voltage (IO = 1.0 A, TJ = 25°C) Output Noise Voltage (TA = 25°C) 10 Hz ≤ f ≤ 100 kHz Vin = 35 Vdc Peak Output Current (TJ = 25°C) Average Temperature Coefficient of Output Voltage 11. Tlow = 0°C for STC7800 Series Thigh = +125°C for STC7800 Series = *40°C for STC7800 Series 12. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account separately. Pulse testing with low duty cycle is used. 8 STC7800 Series 3.0 80 2.5 RR, RIPPLE REJECTION (dB) I O, OUTPUT CURRENT (A) TJ = −40°C TJ = 0°C 2.0 TJ = 25°C 1.5 TJ = 85°C 1.0 TJ = 125°C 0.5 0 4.0 6.0 8.0 10 12 15 20 25 30 35 70 60 50 40 4.0 40 f = 120 Hz IO = 20 mA DVin = 1.0 V(RMS) PART # Vin STC MC7805C= 10 V STC MC7806C= 11 V STC MC7808C= 14 V STC MC7812C= 19 V STC MC7815C= 23 V STC MC7818C= 27 V MC7824C= 33 V 6.0 8.0 10 12 14 16 18 20 22 Vin−Vout, INPUT/OUTPUT VOLTAGE DIFFERENTIAL (V) VO, OUTPUT VOLTAGE (V) Figure 2. Peak Output Current as a Function of Input/Output Differential Voltage Figure 3. Ripple Rejection as a Function of Output Voltages 24 VO, OUTPUT VOLTAGE (V) RR, RIPPLE REJECTION (dB) 80 70 STC7800 MC78XXB, C, AC 60 Vin = 8.0 V to 18 V IO = 500 mA f = 120 Hz TA = 25°C 50 40 30 0.01 0.1 1.0 20 60 100 140 TJ, JUNCTION TEMPERATURE (°C) Figure 4. Ripple Rejection as a Function of Frequency Figure 5. Output Voltage as a Function of Junction Temperature (STC7805) 180 6.0 IB , QUIESCENT CURRENT (mA) Z O , OUTPUT IMPEDANCE (m) Ω −20 f, FREQUENCY (kHz) 5.0 f = 120 Hz IO = 500 mA CL = 0 mF 1.0 0.5 0.3 0.2 0.1 4.0 4.9 4.8 −60 10 10 3.0 2.0 Vin = 20 V IO = 5.0 mA 5.0 8.0 12 16 20 4.0 3.0 2.0 1.0 0 −75 24 Vin = 10 V VO = 5.0 V IL = 20 mA −50 −25 0 25 50 75 100 TJ, JUNCTION TEMPERATURE (°C) VO, OUTPUT VOLTAGE (V) Figure 6. Output Impedance as a Function of Output Voltage Figure 7. Quiescent Current as a Function of Temperature 9 125 STC7800 Series APPLICATIONS INFORMATION Design Considerations wire lengths, or if the output load capacitance is large. An input bypass capacitor should be selected to provide good high−frequency characteristics to insure stable operation under all load conditions. A 0.33 mF or larger tantalum, mylar, or other capacitor having low internal impedance at high frequencies should be chosen. The bypass capacitor should be mounted with the shortest possible leads directly across the regulators input terminals. Normally good construction techniques should be used to minimize ground loops and lead resistance drops since the regulator has no external sense lead. The STC7800 Series of fixed voltage regulators are designed with Thermal Overload Protection that shuts down the circuit when subjected to an excessive power overload condition, Internal Short Circuit Protection that limits the maximum current the circuit will pass, and Output Transistor Safe−Area Compensation that reduces the output short circuit current as the voltage across the pass transistor is increased. In many low current applications, compensation capacitors are not required. However, it is recommended that the regulator input be bypassed with a capacitor if the regulator is connected to the power supply filter with long STC7805 Input 0.33 mF R IO Constant Current to Grounded Load Output STC7805 Input 7 0.33 mF 2 0.1 mF 6 3 The STC7800 MC7800 regulators can also be used as a current source when connected as above. In order to minimize dissipation the STC7800 MC7805C is chosen in this application. Resistor R determines the current as follows: 1.0 k I + 5.0V ) I B O R 4 10 k MC1741G VO = 7.0 V to 20 V VIN = VO ≥ 2.0 V IB ^ 3.2 mA over line and load changes. For example, a 1.0 A current source would require R to be a 5.0 W, 10 W resistor and the output voltage compliance would be the input voltage less 7.0 V. The addition of an operational amplifier allows adjustment to higher or intermediate values while retaining regulation characteristics. The minimum voltage obtainable with this arrangement is 2.0 V greater than the regulator voltage. Figure 8. Current Regulator Figure 9. Adjustable Output Regulator RSource MJ2955 or Equiv. Input Input 0.33 mF R RSC RSource STC78XX 0.33 mF 2N6049 or Equiv. Output R ≥ 10 mF 1.0 mF MJ2955 or Equiv. 1.0 mF ≥ 10 mF XX = 2 digits of type number indicating voltage. STC78XX 1.0 mF Output XX = 2 digits of type number indicating voltage. The STC7800 MC7800 series can be current boosted with a PNP transistor. The MJ2955 provides current to 5.0 A. Resistor R in conjunction with the VBE of the PNP determines when the pass transistor begins conducting; this circuit is not short circuit proof. Input/output differential voltage minimum is increased by VBE of the pass transistor. The circuit of Figure 10 can be modified to provide supply protection against short circuits by adding a short circuit sense resistor, RSC, and an additional PNP transistor. The current sensing PNP must be able to handle the short circuit current of the three−terminal regulator. Therefore, a four−ampere plastic power transistor is specified. Figure 10. Current Boost Regulator Figure 11. Short Circuit Protection 10 STC7800 Series 2.5 20 Vin − Vout , INPUT−OUTPUT VOLTAGE DIFFERENTIAL (V) qHS = 0°C/W 16 qHS = 5°C/W 12 qHS = 15°C/W 8.0 4.0 No Heatsink 0 −50 −25 0 25 50 75 100 125 IO = 1.0 A IO = 500 mA 2.0 IO = 200 mA 1.5 IO = 20 mA IO = 0 mA 1.0 0.5 DVO = 2% of VO − − − Extended Curve for MC78XXB 0 −75 150 −50 −25 0 25 50 75 100 125 TJ, JUNCTION TEMPERATURE (°C) Figure 12. Worst Case Power Dissipation versus Ambient Temperature Figure 13. Input Output Differential as a Function of Junction Temperature JUNCTION-TO-AIR (° C/W) R θ JA, THERMAL RESISTANCE 80 3.5 70 PD(max) for TA = 50°C Free Air Mounted Vertically 60 ÎÎÎÎ ÎÎÎÎ ÎÎÎÎ ÎÎÎÎ 2.0 oz. Copper L Minimum Size Pad 50 2.5 2.0 L 1.5 40 RqJA 30 3.0 0 5.0 10 15 20 25 PD, MAXIMUM POWER DISSIPATION (W) TA, AMBIENT TEMPERATURE (°C) 1.0 30 L, LENGTH OF COPPER (mm) 100 JUNCTION−TO−AIR (° C/W) 2.4 PD(max) for TA = 50°C Free Air Mounted Vertically 90 2.0 ÎÎÎÎ ÎÎÎÎ ÎÎÎÎ ÎÎÎÎ 80 Minimum Size Pad 70 60 2.0 oz. Copper L 1.6 L 1.2 0.8 50 0.4 RqJA 40 0 0 5.0 10 15 20 25 30 L, LENGTH OF COPPER (mm) Figure 15. DPAK Thermal Resistance and Maximum Power Dissipation versus P.C.B. Copper Length 11 PD, MAXIMUM POWER DISSIPATION (W) Figure 14. D2PAK Thermal Resistance and Maximum Power Dissipation versus P.C.B. Copper Length R θ JA, THERMAL RESISTANCE PD , POWER DISSIPATION (W) qJC = 5°C/W qJA = 65°C/W TJ(max) = 150°C