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1.6.3
Power rising/falling edge sequence control function
Functions
• Inverter control:
The microcomputer pin 57 P_INVT is used to control the inverter lighting, and the microcom-
puter pin 59 PRO_DLY is used to control the validity of the inverter's protection circuit. The
ASIC PWM output DUTYCINV is used to control the royer oscillation of inverter. The micro-
computer can control panel dimming by controlling the ASIC PWM output frequency. The
inverter control signal timing specifications at the power's rising edge are shown below.
• Power board control
The microcomputer pin 53 P_SAVE is used to control the switching of the power board's PRC
mode and resonance mode. The sequence at the power's rising edge is shown below. During
power save, operation takes place at the PRC mode having good power efficiency. However,
as a high load current cannot be passed (maximum approx. 1A at 12V), the resonance mode
in which a load current can be applied is used normally.
µ
-COM Pin No.
53
59
47 ~ 51
57
58
56
55
54
60
52
I/O
O
O
I/O
O
O
O
O
O
O
O
Signal name
Remarks
Function
P_SAVE
PRO_DLY
MS*, RSTN
P_INVT
P_PANEL
P_SUSP1
P_SUSP2
P_SUSP3
P_ON
P_TMDS
PWB-POWER
PWB-POWER
ASIC
PWB-POWER
DTC114EUA
SI3025LSA
SI3025LSA
NJM2870F25
PQ1U501M2ZP
SI3033LSA
PRC mode of power borad : Lo / resonance mode : Hi switching
Inverter protection circuit Invalid : Lo/Valid : Hi
ASIC control (for DUTYCINV : PWM for inverter royer oscillation)
Inverter lighting control Off : Lo / On : Hi
Panel 5V power OFF : Lo / ON : Hi
A2_5V power
OFF : Lo / ON : Hi
D2_5V power
OFF : Lo / ON : Hi
P2_5V power
OFF : Lo / ON : Hi
A5V power
OFF : Lo / ON : Hi
TM3_3V power
OFF : Lo / ON : Hi
List of control signals
P_INVT
PRO_DLY
DUTYCINV
100msec (Typ.)
1300msec (Typ.)
600msec (Typ.)
PRC MODE
RESONANCE MODE
RESONANCE MODE
PRC MODE
Stand-by
Stand-by
Full load
Full load
Power ON
Microcomputer signal
(P_SAVE)
Inverter
Summary of Contents for LCD1550X-BK
Page 88: ...SCHEMATIC DIAGRAM POWER LCD1550X Normal Power Save 1ch Pin 4 2ch Pin 1 3ch Pin 2 4ch Pin 5 ...
Page 89: ...SCHEMATIC DIAGRAM PWB MAIN POWER LCD1550X ...
Page 90: ...SCHEMATIC DIAGRAM PWB MAIN INPUT LCD1550X ...
Page 91: ...SCHEMATIC DIAGRAM PWB MAIN SYNC LCD1550X ...
Page 92: ...SCHEMATIC DIAGRAM PWB MAIN TMDS LCD1550X ...
Page 96: ...SCHEMATIC DIAGRAM PWB MAIN ASIC LCD1550X ...
Page 97: ...SCHEMATIC DIAGRAM INVERTER LCD1550X 1ch Q701 B 2ch Q702 B ...
Page 98: ...SCHEMATIC DIAGRAM PWB SW LCD1550X ...
Page 100: ...SCHEMATIC DIAGRAM POWER LCD1550X ...
Page 101: ...SCHEMATIC DIAGRAM PWB MAIN POWER LCD1550X ...
Page 102: ...SCHEMATIC DIAGRAM PWB MAIN INPUT LCD1550X ...
Page 103: ...SCHEMATIC DIAGRAM PWB MAIN SYNC LCD1550X ...
Page 104: ...SCHEMATIC DIAGRAM PWB MAIN TMDS LCD1550X ...
Page 105: ...SCHEMATIC DIAGRAM PWB MAIN MC LCD1550X ...
Page 106: ...SCHEMATIC DIAGRAM PWB MAIN ASIC LCD1550X ...
Page 107: ...SCHEMATIC DIAGRAM INVERTER LCD1550X ...
Page 108: ...SCHEMATIC DIAGRAM PWB SW LCD1550X ...
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