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UX-L40R/UX-L30R
L4909 (IC942) : Regulator
1. Pin layout
1
2
3
2. Block diagram
6
EN1
7
EN2
9
EN3
5
OC
4
TRIG
8
GND
3. Pin functions
Pin No.
Symbol
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
1-38
4
5
6
7
8
9 10 11 12 13 14 15
THERMAL
REFERENCE
SHUTDOWN
GENERATOR
REG1
ENABLE
REG2
CONTROL
REG3
OVER
CURRENT
CHECK
Function
FB1
REG1 feedback voltage input
VO1
REG1 output voltage
VINA
Input DC supply voltage
TRIG
Trigger for external SCR (crowbar protection)
OC
Over current warning output
EN1
REG1 enable input
EN2
REG2 enable input
GND
Analog ground
EN3
REG3 enable input
FB3
REG3 feedback voltage input
VO3
REG3 output voltage
N.C.
Not connected
VINB
Input DC supply voltage
VO2
REG2 output voltage
FB2
REG2 feedback voltage input
REF
3,13
REF+20%
REG1
REG2
REG3
VINA
VINB
2
VO1
1
FB1
14
VO2
15
FB2
11
VO3
10
FB3
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