View STC7800_4613815.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

STC7800 Series
http://onsemi.com
1.0 A Positive Voltage Regulators
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 = 25C, unless otherwise noted)
1 2 3 4 12 1 Pin 1. Input 2. Ground 3. Output
TO-220 T SUFFIX CASE 221A Heatsink surface connected to Pin 2.
D2PAK D2T SUFFIX CASE 936
3 3 Heatsink surface (shown as terminal 4 in case outline drawing) is connected to Pin 2. 4 12 3 DPAK DT SUFFIX CASE 369C
STANDARD APPLICATION
Input Cin* 0.33 mF STC78XX Output CO**
Rating Input Voltage (5.0 - 18 V) )
Symbol VI PD RqJA RqJC Tstg TJ 92 5.0
Value 35 40 Internally Limited 65 5.0 -65 to +150 +150 Figure 14 5.0
Unit Vdc W C/W C/W C
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.
Power Dissipation Thermal Resistance, Junction-to-Ambient Thermal Resistance, Junction-to-Case Storage Junction Temperature Range Operating Junction Temperature
ORDERING INFORMATION
C
See detailed ordering and shipping information in the package dimensions section on page 21 of this data sheet.
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.
DEVICE MARKING INFORMATION
See general marking information in the device marking section on page 25 of this data sheet.
1
STC7800 Series
MC7800 STC7800
LAT Q17 Vin R24 50 LAT 3 A Q18 Q19 QNPN C3 Q10 QNPN R18 100 k R22 100 Q7 QNPN R17 9.0 k D1 Zener R1 10.66 k Q8 QNPN R2 1.56 k R5 4.5 k Q14 QNPN Q1 C2 3.0 P N+ QNPN 6 Q13 QNPN R6 1.0 k R7 14 k Q4 QNPN Q3 QNPN C1 30 P R21 600 1.0 P D2 Zener R19 27.5 k Q20 QNPN R14 1.0 k R15 680
R23 0.2 Vout 5.01 R30 18 k Sense
Q5 QNPN 2 Q9 QNPN 2 Q12 QNPN R11 15 k Q15 QNPN R20 17500 R16 600 R10 3340-(3316ACT) R12 3.0 k R25 6.0 k R26 3.0 k R29 9.0 k R28 9.0 k R27 9.0 k
Q6 QNPN
R9 3.0 k SUB Q11 2
R13 11660
Q2 Q16 QNPN 4 Diode R3 1.8 k R8 5.0 k
This device contains 22 active transistors.
Figure 1. Representative Schematic Diagram
2
STC7800 Series
ELECTRICAL CHARACTERISTICS (Vin = 10 V, IO = 1.0 A, TJ = Tlow to Thigh (Note 1), unless otherwise noted) STC7805
Characteristic Output Voltage (TJ = 25C) Output Voltage (5.0 mA IO 1.0 A, PD 15 W) 7.5 Vdc Vin 20 Vdc Line Regulation (Note 2) 7.5 Vdc Vin 25 Vdc, IO = 500 mA 8.0 Vdc Vin 12 Vdc, IO = 1.0 A 8.0 Vdc Vin 12 Vdc, IO = 1.0 A, TJ = 25C 7.3 Vdc Vin 20 Vdc, IO = 1.0 A, TJ = 25C Load Regulation (Note 2) 5.0 mA IO 1.5 A, TJ = 25C 5.0 mA IO 1.0 A 250 mA IO 750 mA Quiescent Current Quiescent Current Change 8.0 Vdc Vin 25 Vdc, IO = 500 mA 7.5 Vdc Vin 20 Vdc, TJ = 25C 5.0 mA IO 1.0 A Ripple Rejection 8.0 Vdc Vin 18 Vdc, f = 120 Hz, IO = 500 mA Dropout Voltage (IO = 1.0 A, TJ = 25C) Output Noise Voltage (TA = 25C) 10 Hz f 100 kHz Output Resistance (f = 1.0 kHz) Short Circuit Current Limit (TA = 25C) Vin = 35 Vdc Peak Output Current (TJ = 25C) Average Temperature Coefficient of Output Voltage RR VI - VO Vn rO ISC Imax TCVO IB DIB - - - 68 - - - - - - 0.3 - 0.08 83 2.0 10 0.9 0.2 2.2 -0.3 0.8 0.8 0.5 - - - - - - - dB Vdc mV/VO mW A A mV/C Regload - - - - 1.3 0.8 0.53 3.2 25 25 15 6.0 mA mA Symbol VO VO Regline - - - - 0.5 0.8 1.3 4.5 10 12 4.0 10 mV Min 4.9 4.8 Typ 5.0 5.0 Max 5.1 5.2 Unit Vdc Vdc mV
1. Tlow = 0C for STC7800 Series Thigh = +125C for STC7800 Series = *40C 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 Output Voltage (TJ = 25C) Output Voltage (5.0 mA IO 1.0 A, PD 15 W) 8.6 Vdc Vin 21 Vdc Line Regulation (Note 4) 8.6 Vdc Vin 25 Vdc, IO = 500 mA 9.0 Vdc Vin 13 Vdc, IO = 1.0 A Load Regulation (Note 4) 5.0 mA IO 1.5 A, TJ = 25C 5.0 mA IO 1.0 A 250 mA IO 750 mA Quiescent Current Quiescent Current Change 9.0 Vdc Vin 25 Vdc, IO = 500 mA 9.0 Vdc Vin 21 Vdc, IO = 1.0 A, TJ = 25C 5.0 mA IO 1.0 A Ripple Rejection 9.0 Vdc Vin 19 Vdc, f = 120 Hz, IO = 500 mA Dropout Voltage (IO = 1.0 A, TJ = 25C) Output Noise Voltage (TA = 25C) 10 Hz f 100 kHz Output Resistance (f = 1.0 kHz) Short Circuit Current Limit (TA = 25C) Vin = 35 Vdc Peak Output Current (TJ = 25C) Average Temperature Coefficient of Output Voltage Imax TCVO - - 2.2 -0.3 - - A mV/C rO ISC - - 0.9 0.2 - - mW A VI - VO Vn - - 2.0 10 - - Vdc mV/VO RR IB DIB - - - 58 - - - 65 0.8 0.8 0.5 - dB Regload - - - - 1.3 0.9 0.2 3.3 25 25 15 6.0 mA mA Regline - - 5.0 1.4 12 15 mV mV Symbol VO VO Min 5.88 5.76 Typ 6.0 6.0 Max 6.12 6.24 Unit Vdc Vdc
3. Tlow = 0C for STC7800 Series Thigh = +125C for STC7800 Series = *40C 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 Output Voltage (TJ = 25C) Output Voltage (5.0 mA IO 1.0 A, PD 15 W) 10.6 Vdc Vin 23 Vdc 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 = 25C Load Regulation (Note 6) 5.0 mA IO 1.5 A, TJ = 25C 5.0 mA IO 1.0 A 250 mA IO 750 mA Quiescent Current Quiescent Current Change 11 Vdc Vin 25 Vdc, IO = 500 mA 10.6 Vdc Vin 23 Vdc, IO = 1.0 A, TJ = 25C 5.0 mA IO 1.0 A Ripple Rejection 11.5 Vdc Vin 21.5 Vdc, f = 120 Hz, IO = 500 mA Dropout Voltage (IO = 1.0 A, TJ = 25C) Output Noise Voltage (TA = 25C) 10 Hz f 100 kHz Output Resistance f = 1.0 kHz Short Circuit Current Limit (TA = 25C) Vin = 35 Vdc Peak Output Current (TJ = 25C) Average Temperature Coefficient of Output Voltage Symbol VO VO Regline - - - Regload - - - IB DIB - - - RR VI - VO Vn rO ISC Imax TCVO 56 - - - - - - - - - 62 2.0 10 0.9 0.2 2.2 -0.4 0.8 0.8 0.5 - - - - - - - dB Vdc mV/VO mW A A mV/C - 1.4 1.0 0.22 3.3 25 25 15 6.0 mA mA 6.0 1.7 5.0 15 18 15 mV Min 7.84 7.7 Typ 8.0 8.0 Max 8.16 8.3 Unit Vdc Vdc mV
5. Tlow = 0C for STC7800 Series Thigh = +125C for STC7800 Series = *40C 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 Output Voltage (TJ = 25C) Output Voltage (5.0 mA IO 1.0 A, PD 15 W) 14.8 Vdc Vin 27 Vdc Line Regulation (Note 8) 14.8 Vdc Vin 30 Vdc, IO = 500 mA 16 Vdc Vin 22 Vdc, IO = 1.0 A 14.5 Vdc Vin 27 Vdc, TJ = 25C Load Regulation (Note 8) 5.0 mA IO 1.5 A, TJ = 25C 5.0 mA IO 1.0 A Quiescent Current Quiescent Current Change 15 Vdc Vin 30 Vdc, IO = 500 mA 14.8 Vdc Vin 27 Vdc, TJ = 25C 5.0 mA IO 1.0 A, TJ = 25C Ripple Rejection 15 Vdc Vin 25 Vdc, f = 120 Hz, IO = 500 mA Dropout Voltage (IO = 1.0 A, TJ = 25C) Output Noise Voltage (TA = 25C) 10 Hz f 100 kHz Output Resistance (f = 1.0 kHz) Short Circuit Current Limit (TA = 25C) Vin = 35 Vdc Peak Output Current (TJ = 25C) Average Temperature Coefficient of Output Voltage Imax TCVO - - 2.2 -0.8 - - A mV/C rO ISC - - 1.1 0.2 - - mW A VI - VO Vn - - 2.0 10 - - Vdc mV/VO RR IB DIB - - - 55 - - - 60 0.8 0.8 0.5 - dB Regload - - - - - 3.4 25 25 6.0 mA mA Regline - - - 3.8 2.2 6.0 18 20 120 mV mV Symbol VO VO Min 11.75 11.5 Typ 12 12 Max 12.25 12.5 Unit Vdc Vdc
7. Tlow = 0C for STC7800 Series Thigh = +125C for STC7800 Series = *40C 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 Output Voltage (TJ = 25C) Output Voltage (5.0 mA IO 1.0 A, PD 15 W) 17.9 Vdc Vin 30 Vdc Line Regulation (Note 10) 17.9 Vdc Vin 30 Vdc, IO = 500 mA 20 Vdc Vin 26 Vdc 17.5 Vdc Vin 30 Vdc, IO = 1.0 A, TJ = 25C Load Regulation (Note 10) 5.0 mA IO 1.5 A, TJ = 25C 5.0 mA IO 1.0 A 250 mA IO 750 mA Quiescent Current Quiescent Current Change 17.5 Vdc Vin 30 Vdc, IO = 500 mA 17.5 Vdc Vin 30 Vdc, IO = 1.0 A, TJ = 25C 5.0 mA IO 1.0 A Ripple Rejection 18.5 Vdc Vin 28.5 Vdc, f = 120 Hz, IO = 500 mA Dropout Voltage (IO = 1.0 A, TJ = 25C) Output Noise Voltage (TA = 25C) 10 Hz f 100 kHz Output Resistance f = 1.0 kHz Short Circuit Current Limit (TA = 25C) Vin = 35 Vdc Peak Output Current (TJ = 25C) Average Temperature Coefficient of Output Voltage Imax TCVO - - 2.2 -1.0 - - A mV/C rO ISC - - 1.2 0.2 - - mW A VI - VO Vn - - 2.0 10 - - Vdc mV/VO RR IB DIB - - - 60 - - - 80 0.8 0.8 0.5 - dB Regload - - - - 1.8 1.5 1.2 3.5 25 25 15 6.0 mA mA Regline - - - 8.5 3.0 7.0 20 22 20 mV mV Symbol VO VO Min 14.7 14.4 Typ 15 15 Max 15.3 15.6 Unit Vdc Vdc
9. Tlow = 0C for STC7800 Series Thigh = +125C for STC7800 Series = *40C 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 Output Voltage (TJ = 25C) Output Voltage (5.0 mA IO 1.0 A, PD 15 W) 21 Vdc Vin 33 Vdc Line Regulation (Note 12) 21 Vdc Vin 33 Vdc, IO = 500 mA 24 Vdc Vin 30 Vdc, IO = 1.0 A 24 Vdc Vin 30 Vdc, IO = 1.0 A, TJ = 25C 20.6 Vdc Vin 33 Vdc, IO = 1.0 A, TJ = 25C Load Regulation (Note 12) 5.0 mA IO 1.5 A, TJ = 25C 5.0 mA IO 1.0 A 250 mA IO 750 mA Quiescent Current Quiescent Current Change 21 Vdc Vin 33 Vdc, IO = 500 mA 21.5 Vdc Vin 30 Vdc, TJ = 25C 5.0 mA IO 1.0 A Ripple Rejection 22 Vdc Vin 32 Vdc, f = 120 Hz, IO = 500 mA Dropout Voltage (IO = 1.0 A, TJ = 25C) Output Noise Voltage (TA = 25C) 10 Hz f 100 kHz Output Resistance f = 1.0 kHz Short Circuit Current Limit (TA = 25C) Vin = 35 Vdc Peak Output Current (TJ = 25C) Average Temperature Coefficient of Output Voltage Imax TCVO - - 2.2 -1.5 - - A mV/C rO ISC - - 1.3 0.2 - - mW A VI - VO Vn - - 2.0 10 - - Vdc mV/VO RR IB DIB - - - 53 - - - 57 0.8 0.8 0.5 - dB Regload - - - - 2.0 1.8 1.5 3.5 25 25 15 6.0 mA mA Regline - - - - 9.5 3.2 3.2 8.0 22 25 10.5 22 mV mV Symbol VO VO Min 17.64 17.3 Typ 18 18 Max 18.36 18.7 Unit Vdc Vdc
11. Tlow = 0C for STC7800 Series Thigh = +125C for STC7800 Series = *40C 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 TJ = -40C TJ = 0C TJ = 25C RR, RIPPLE REJECTION (dB) I O, OUTPUT CURRENT (A) 2.5 2.0 1.5 1.0 0.5 0 4.0 TJ = 85C TJ = 125C 70 PART # STC MC7805C STC MC7806C STC MC7808C STC MC7812C STC MC7815C STC MC7818C MC7824C 6.0 Vin = 10 V = 11 V = 14 V = 19 V = 23 V = 27 V = 33 V 10 12 14 16 f = 120 Hz IO = 20 mA DVin = 1.0 V(RMS) 80
60
50
6.0
8.0
10
12
15
20
25
30
35
40
40 4.0
8.0
18
20
22
24
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
80 RR, RIPPLE REJECTION (dB) VO, OUTPUT VOLTAGE (V) 70 5.0 Vin = 20 V IO = 5.0 mA
STC7800 MC78XXB, C, AC
60 50 40 30 0.01 Vin = 8.0 V to 18 V IO = 500 mA f = 120 Hz TA = 25C
4.9
0.1
1.0 f, FREQUENCY (kHz)
10
4.8 -60
-20
20
60
100
140
180
TJ, JUNCTION TEMPERATURE (C)
Figure 4. Ripple Rejection as a Function of Frequency
Figure 5. Output Voltage as a Function of Junction Temperature (STC7805)
10 Z O , OUTPUT IMPEDANCE (m ) 5.0 3.0 2.0 1.0 0.5 0.3 0.2 0.1 4.0 8.0 12 16 20 24 f = 120 Hz IO = 500 mA CL = 0 mF IB , QUIESCENT CURRENT (mA)
6.0 4.0 3.0 2.0 1.0 0 -75 Vin = 10 V VO = 5.0 V IL = 20 mA
-50
-25
0
25
50
75
100
125
VO, OUTPUT VOLTAGE (V)
TJ, JUNCTION TEMPERATURE (C)
Figure 6. Output Impedance as a Function of Output Voltage
Figure 7. Quiescent Current as a Function of Temperature
9
STC7800 Series
APPLICATIONS INFORMATION
Design Considerations
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
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.
Input 0.33 mF
STC7805 R Constant Current to Grounded Load Input STC7805
Output
IO
7 0.33 mF 6
2 3 10 k
0.1 mF
The STC7800 regulators can also be used as a current source when MC7800 connected as above. In order to minimize dissipation the STC7800 is MC7805C chosen in this application. Resistor R determines the current as follows: I + 5.0 V ) I B O R 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.
1.0 k
4
MC1741G
VO = 7.0 V to 20 V VIN = VO 2.0 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
MJ2955 or Equiv. 0.33 mF 2N6049 or Equiv. R STC78XX 1.0 mF XX = 2 digits of type number indicating voltage. 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. Output
RSource Input
MJ2955 or Equiv. 0.33 mF R STC78XX Output
RSource Input
RSC
10 mF
1.0 mF
1.0 mF
10 mF
XX = 2 digits of type number indicating voltage. The STC7800 series can be current boosted with a PNP transistor. The MC7800 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.
Figure 10. Current Boost Regulator
Figure 11. Short Circuit Protection
10
STC7800 Series
20 Vin - Vout , INPUT-OUTPUT VOLTAGE DIFFERENTIAL (V) 16 PD , POWER DISSIPATION (W) 12 8.0 4.0 0 -50 qHS = 0C/W qHS = 5C/W qHS = 15C/W qJC = 5C/W qJA = 65C/W TJ(max) = 150C 2.5 IO = 1.0 A 2.0 1.5 1.0 0.5 IO = 500 mA IO = 200 mA IO = 20 mA IO = 0 mA
No Heatsink -25 0 25 50 75 100 125 150
DVO = 2% of VO - - - Extended Curve for MC78XXB -50 -25 0 25 50 75 100 125
0 -75
TA, AMBIENT TEMPERATURE (C)
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)
70 60 50
Free Air Mounted Vertically
PD(max) for TA = 50C 2.0 oz. Copper L
3.0 2.5 2.0 1.5
Minimum Size Pad
L
40 RqJA 30 0 5.0 10 15 20
25
1.0 30
L, LENGTH OF COPPER (mm)
Figure 14. D2PAK Thermal Resistance and Maximum Power Dissipation versus P.C.B. Copper Length
R JA, THERMAL RESISTANCE
JUNCTION-TO-AIR ( C/W)
90 80 70 60 50
Free Air Mounted Vertically Minimum Size Pad
PD(max) for TA = 50C 2.0 2.0 oz. Copper L
1.6 1.2 0.8 0.4 0
L
RqJA 40 0 5.0 10 15 20 L, LENGTH OF COPPER (mm)
25
30
Figure 15. DPAK Thermal Resistance and Maximum Power Dissipation versus P.C.B. Copper Length
11
PD, MAXIMUM POWER DISSIPATION (W)
100
2.4
PD, MAXIMUM POWER DISSIPATION (W)
80 R JA, THERMAL RESISTANCE
3.5
IIII IIII IIII IIII IIII IIII IIII IIII

▲Up To Search▲

Price & Availability of STC7800

	To Download STC7800 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .