LM2931(2007) データシートの表示（PDF） - ON Semiconductor
部品番号
コンポーネント説明
一致するリスト
LM2931
(Rev.:2007)
(Rev.:2007)
ON Semiconductor
LM2931 Datasheet PDF : 23 Pages
| |||
LM2931, NCV2931 Series
Vin
Cin
0.1
Input LM2931−5.0 Output
Fixed
Output
IB GND
Vout
CO
Figure 17. Fixed Output Regulator
Input
Output
Vin
51 k
LM2931C
Output Adjustable
R1
Cin
2 Inhibit
Output Adjust
0.1
1
IAdj
IB GND
R2
Vout
CO
Switch Position 1 = Output On", 2 = Output Off"
ǒ Ǔ Vout + Vref
1
)
R2
R1
) IAdj R2
22.5 k
w
R1 R2
R1 ) R2
Figure 18. Adjustable Output Regulator
Input
≥ 6.0 V
68
D45VH7
R
+
100
LM2931−5.0
Input
R
5.0 V @ 5.0 A
+ Output
100
RSC
LM2931−5.0
+
100
Output
+
100
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.
Figure 19. (5.0 A) Low Differential
Voltage Regulator
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.
Figure 20. Current Boost Regulator with
Short Circuit Projection
Input
6.4 V to 30 V
+
100
LM2931C 2.0 k
8.2 k
+
100
CM
#345
33 k
6.2 V
0
fosc = 2.2 Hz
Figure 21. Constant Intensity Lamp Flasher
http://onsemi.com
9
Share Link: