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參數(shù)資料
| 型號： | 06F9206 |
| 英文描述： | LM2931AT-5.0:IC-ADJ.VOLTAGE REGULATOR |
| 中文描述： | LM2931AT - 5.0：集成電路ADJ.VOLTAGE調(diào)節(jié)器 |
| 文件頁數(shù)： | 15/16頁 |
| 文件大?。?/td> | 308K |
| 代理商： | 06F9206 |
LM2931 Series
8
MOTOROLA ANALOG IC DEVICE DATA
0.1
1.0
0.01
V n
,OUTPUT
NOISE
VOL
TAGE
(mV
rms)
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
|ZO|, MAGNITUDE OF CAPACITOR IMPEDANCE (m)
10
100
1.0 k
10 k
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
The circuit of Figure 19 can be modified to provide supply protection against
short circuits by adding the current sense resistor RSCandanadditionalPNP
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
++
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
10
100
Vin = 5.6 V
Vout = 5.0 V
IO = 100 mA
Vnrms 10 Hz to 10 MHz
|ZO| @ 40 kHz
TA = 25°C
22.5 k
w
R
1
R
2
R
1 )
R
2
Vout + Vref 1 )
R
2
R
1
) I
Adj
R
2
R
Unstable
Marginally
Stable
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