LP2950/LP2951
TYPICAL APPLICATIONS (continued)
+V IN
8
10K
Ω
.
+V IN
_______
ERROR
5
1
5 DEGREE SHUTDOWN FLAG
3
AUX SHUTDOW
INPUT
.
SD
OFF
LP2951
ON
V
OUT
GND
FB
EXTERNAL CIRCUIT
PROTECTED FROM
4
7
OR
+
OVER TEMPERATURE
(V+ GOES OFF WHEN
TEMP > 125)
TEMP
SENSOR
AS35
RELAY
-
8.2K
Ω
Figure 7. System Over Temperature Protection
+5V
4.7mA
UNREGULATED INPUT
4
20mA
8
OUTPUT
8
330K
Ω
IN
1
+V IN
2N5432
(2)
VOUT
1
V OUT
27K
Ω
LP2951
1N4001
LP2951
2
5V
6
7
SENSE
0.1µF
VTAP
FB
2
OUTPUT
FB
7
GND
4
+
4.7µF
LOAD
50mA
GND
4
360K
Ω
TO
300 mA
1N457
MIN VOLTAGE = 4V
Figure 8. Open Circuit Detector for 4mA to 20mA Current
Loop
Figure 9. 300mA Regulator with 0.75V
Rev. 8/10/01
LP2950/51 100mA Low Dropout Voltage Regulators
©Copyright 2001 Sipex Corporation
11
EXAR [ EXAR CORPORATION ]
