JVC UX-P55 Service Manual page 28

4.5 L4909 (IC910) : Regulator
• Pin layout
1 2 3 4 5 6
• Block diagram
EN1
EN2
EN3
OC
TRIG
GND
• Pin functions
Pin No. Symbol
1 FB1 REG1 feedback voltage input
2 VO1 REG1 output voltage
3 VINA Input DC supply voltage
4 TRIG Trigger for external SCR (crowbar protection)
5 OC Over current warning output
6 EN1 REG1 enable input
7 EN2 REG2 enable input
8 GND Analog ground
9 EN3 REG3 enable input
10 FB3 REG3 feedback voltage input
11 VO3 REG3 output voltage
12 N.C. Not connected
13 VINB Input DC supply voltage
14 VO2 REG2 output voltage
15 FB2 REG2 feedback voltage input
1-28 (No.22036)
7 8 9 10 11 12 13 14 15
THERMAL
SHUTDOWN
6
7
ENABLE
CONTROL
9
5
OVER
CURRENT
CHECK
4
8
Function
REF
REFERENCE
REF+20%
GENERATOR
REG1
REG2
REG3
VINA
VINB
3,13
REG1
2
VO1
1
FB1
REG2
14
VO2
15
FB2
REG3
11
VO3
10
FB3