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L7812CT Datasheet(PDF) 3 Page - STMicroelectronics

Part # L7812CT
Description  Positive voltage regulators
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L7812CT Datasheet(HTML) 3 Page - STMicroelectronics

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L78xx - L78xxC
List of figures
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List of figures
Figure 1.
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 2.
Pin connections (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 3.
Schematic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 4.
Application circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 5.
DC parameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 6.
Load regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 7.
Ripple rejection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 8.
Dropout voltage vs junction temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 9.
Peak output current vs input/output differential voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 10.
Supply voltage rejection vs frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 11.
Output voltage vs junction temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 12.
Output impedance vs frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 13.
Quiescent current vs junction temp. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 14.
Load transient response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Figure 15.
Line transient response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Figure 16.
Quiescent current vs input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Figure 17.
Fixed output regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Figure 18.
Current regulator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Figure 19.
Circuit for increasing output voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Figure 20.
Adjustable output regulator (7 to 30 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Figure 21.
0.5 to 10 V regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Figure 22.
High current voltage regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Figure 23.
High output current with short circuit protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Figure 24.
Tracking voltage regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Figure 25.
Split power supply (± 15 V - 1 A) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Figure 26.
Negative output voltage circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Figure 27.
Switching regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Figure 28.
High input voltage circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Figure 29.
High input voltage circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Figure 30.
High output voltage regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Figure 31.
High input and output voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Figure 32.
Reducing power dissipation with dropping resistor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Figure 33.
Remote shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Figure 34.
Power AM modulator (unity voltage gain, IO ≤0.5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Figure 35.
Adjustable output voltage with temperature compensation . . . . . . . . . . . . . . . . . . . . . . . . 37
Figure 36.
Light controllers (VOmin = VXX + VBE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Figure 37.
Protection against input short-circuit with high capacitance loads . . . . . . . . . . . . . . . . . . . 38
Figure 38.
Drawing dimension TO-220 (type SMIC-subcon.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Figure 39.
Drawing dimension TO-220 (type STD-ST) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Figure 40.
Drawing dimension TO-220FP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Figure 41.
Drawing dimension TO-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Figure 42.
Drawing dimension DPAK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Figure 43.
Drawing dimension tape and reel for DPAK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Figure 44.
Drawing dimension D²PAK (type STD-ST) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Figure 45.
Drawing dimension D²PAK (type WOOSEOK-Subcon.). . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Figure 46.
D²PAK footprint recommended data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Figure 47.
Drawing dimension tape and reel for D²PAK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53


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