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LM2931CD2T Datasheet(PDF) 9 Page - ON Semiconductor

Part # LM2931CD2T
Description  100 mA, Adjustable Output, LDO Voltage Regulator with 60 V Load Dump Protection
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

LM2931CD2T Datasheet(HTML) 9 Page - ON Semiconductor

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LM2931, NCV2931 Series
http://onsemi.com
9
Figure 17. Fixed Output Regulator
Figure 18. Adjustable Output Regulator
Figure 19. (5.0 A) Low Differential
Voltage Regulator
Figure 20. Current Boost Regulator with
Short Circuit Projection
Figure 21. Constant Intensity Lamp Flasher
Vin
Input
Output
Vout
CO
IB
GND
Cin
0.1
LM2931-5.0
Fixed
Output
Switch Position 1 = Output “On", 2 = Output “Off"
LM2931C
Adjustable
Output
Vin
Cin
0.1
Vout
CO
Output
Input
51 k
1
2
Output
Inhibit
Adjust
GND
IAdj
R1
R2
IB
The LM2931 series can be current boosted with a PNP transistor. The
D45VH7, on a heatsink, will provide an output current of 5.0 A with an input
to output voltage differential of approximately 1.0 V. 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
≥ 6.0 V
D45VH7
5.0 V @ 5.0 A
Output
100
+
100
+
68
LM2931-5.0
LM2931C
Input
6.4 V to 30 V
2.0 k
8.2 k
100
+
CM
#345
100
+
33 k
6.2 V
fosc = 2.2 Hz
0
22.5k
w
R
1
R
2
R
1 )
R
2
Vout + Vref 1 )
R
2
R
1
) I
Adj
R
2
R
The circuit of Figure 19 can be modified to provide supply protection against
short circuits by adding the current sense resistor RSC and an additional PNP
transistor. The current sensing PNP must be capable of handling the short
circuit current of the LM2931. Safe operating area of both transistors must be
considered under worst case conditions.
Input
R
RSC
Output
LM2931-5.0
100
100
++


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