LP2951CN 查看數據表（PDF） - ON Semiconductor
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LP2951CN Datasheet PDF : 22 Pages
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LP2950, LP2951, NCV2951
4
1N4001
+ 5.0 V
20 mA
4.7 k
1
5
Output*
8
NC
5 Error Vin Vout 1 2
SNS 2 NC
LP2951CN
NC 3 SD
VO T 6 NC
0.1 mF
Gnd FB
4
7
4
* High for
IL < 3.5 mA
1N457
1N457
360
1N457
Figure 27. Open Circuit Detector for 4.0 to 20 mA Current Loop
2
MC34164P−5 1
3
100 k
31.6 k
2N3906
6.0 V Lead-Acid
Battery
8
NC 5 Error Vin Vout 1
SNS 2
LP2951CN
3 SD
VO T 6 NC
Gnd FB
4
7
NC
Figure 28. Low Battery Disconnect
1.0 mF
Main V+
Memory V+
20
NiCad Backup
Battery
100
2.4
Free Air
PD(max) for TA = 50°C
90
Mounted
2.0
Vertically
80
Minimum
70
Size Pad
60
2.0 oz. Copper
L
1.6
ÎÎÎÎÎÎ L
1.2
ÎÎÎÎÎÎ 0.8
50
0.4
RqJA
40
0
0
5.0
10
15
20
25
30
L, LENGTH OF COPPER (mm)
Figure 29. DPAK Thermal Resistance and Maximum
Power Dissipation versus PCB Copper Length
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13
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