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參數(shù)資料
| 型號： | LM2931Z-5.0RA |
| 英文描述： | VOLT REGULATOR|FIXED|+5V|BIPOLAR|SIP|3PIN|PLASTIC |
| 中文描述： | 電壓調(diào)節(jié)器|定額| 5V的|雙極|園區(qū)| 3針|塑料 |
| 文件頁數(shù)： | 9/20頁 |
| 文件大?。?/td> | 209K |
| 代理商： | LM2931Z-5.0RA |
LM2931 Series
http://onsemi.com
9
0.1
1.0
0.01
V
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
Figure 22. Output Noise Voltage versus
Output Capacitor Impedance
|Z
O
|, MAGNITUDE OF CAPACITOR IMPEDANCE (m
)
10
100
1.0 k
10 k
V
in
Input
Output
V
out
C
O
I
B
Gnd
C
in
0.1
LM2931
-5.0
Fixed
Output
Switch Position 1 = Output On", 2 = Output Off"
LM2931C
Adjustable
Output
V
in
C
in
0.1
V
out
C
O
Output
Input
51 k
1
2
Output
Inhibit
Adjust
Gnd
I
Adj
R
1
R
2
I
B
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 V
BE
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
f
osc
= 2.2 Hz
0
10
100
V
in
= 5.6 V
V
out
= 5.0 V
I
O
= 100 mA
V
n
rms 10 Hz to 10 MHz
|Z
O
| @ 40 kHz
T
A
= 25
°
C
22.5k
R1R2
R1
R2
Vout
Vref
1
R2
R1
IAdjR2
R
Unstable
Marginally
Stable
Stable
The circuit of Figure 19 can be modified to provide supply protection against
short circuits by adding the current sense resistor R
SC
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
R
SC
Output
LM2931
-5.0
100
100
+
+
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