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Circuit Descriptions, Abbreviation List, and IC Data Sheets
9.2.5
42" PSU (LIPS250PS05)
Control Signals
The control/output signals are driven by open collector/open
drain type circuits. The drive requirements are 3V3 Logic. Open
Collector: 2.2 kohms pull up resistor to +3V3.
Signal Levels:
•
Low or open: less than 0.4V.
•
High: more than 2.4V.
The Power Supply Unit is controlled via a digital input "Standby
# (Stdby)" and the "BL_ON-OFF" signal at the secondary side.
Table 9-12 Mode of operation
Standby# BL_ON-OFF
3V3
CN7 pin 5
High
Low
ON
Low
Low
ON
Low
High
ON
Output Specifications
Table 9-13 "Standby #" is "low" (ON mode)
Description
Vo1
Symbol
3V3 stdby
Nominal voltage
3.3V
± 3%
Voltage tol.
Min. Current (A)
0
Nom. Current (A)
0.2
Max. Current (A)
0.2
Peak Current (A)
0.5
Ripple and noise
50mV
Ground
GND1
Table 9-14 "Standby #" is "low" (Semi-standby mode)
Description
Vo1
Symbol
3V3 stdby 12Vssb + Vaudio
Nominal voltage
3.3V
± 3%
Voltage tol.
Min. Current (A)
0
Nom. Current (A) 0.2
Max. Current (A) 0.2
Peak Current
0.5
Table 9-15 "Standby #" is "high" (Standby mode)
Description
Vo1
Symbol
3V3 stdby 12Vssb + Vaudio
Nominal voltage 3.3V
± 3%
Voltage tol.
Min. Current (A) 0
Nom. Current
0.015
12Vssb Vaudio HV
Note
OFF
OFF
OFF
Standby
ON
ON
OFF
Semi-standby
ON
ON
ON
ON
Vo2
Vo3
Vo4
12Vssb
+ Vaudio
- Vaudio
12V
+ 12V
- 12V
± 5%
-5%, +10%
-5%, +10%
0.1
0
0
3.4
0.45
0.45
3.4
2.5
2.5
4
2.5
2.5
100mV
100mV
100mV
GND1
GND2 (isolated gnd)
Vo2
Vo3
Vo4
Vo5
- Vaudio
HV
12V
+ 12V
- 12V
0
± 5%
11.4~17V
-11.4 ~ -17V 0
0.1
0
0
0
3.4
0
0
0
3.4
0
0
0
4
0
0
0
Vo2
Vo3
Vo4
Vo5
- Vaudio
HV
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Q522.3E LA
Start-up Sequence
Note: ΔVo/dt ~350V/s (max)
Note: Standby # is from small signal board (SSB).
Figure 9-5 Timings 42"
Protections
•
3V3 stdby output
–
Short-circuit proof with auto restart.
–
Over voltage protection should operate within 120% ~
140% of nominal value.
•
12Vssb
–
Short circuit protection with current limit or fuse.
–
Over voltage protection should operate within 120% ~
140% of nominal value.
•
Vaudio
–
Short circuit protection with current limit or fuse.
–
Over voltage protection should be less than absolute
value 19V.
•
HV output
–
Arcing protection.
–
Short circuit protection.
–
Over voltage protection should operate when more
than 4 lamps are disconnected.
Table 9-16 Output connectors
Pin
CN2
CN3
1319
1316
1
HVL
HVR
2
HVL
HVR
3
n.c.
n.c.
4
-
-
5
-
-
-
-
6
7
-
-
8
-
-
-
-
9
10
-
-
11
-
-
9.
EN 105
I_18300_082.ep
161008
CN6
CN7
1M95
1M99
3.3VSB
12V
PSON
12V
GND1
GND1
GND1
GND1
GND1
BL-ON
12V
BL-DIM
12V
BOOST
12V
GND1
+12Vaudio
-
GND2
-
-12Vaudio
-
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