Power Supply - Philips Q548.1E Service Manual

7.2

Power Supply

All power supplies described below are a black box for Service.
When defective, a new board must be ordered and the
defective one must be returned, unless the main fuse of the
board is broken. Always replace a defective fuse with one with
the correct specifications! This part is available in the regular
market.
Consult the Service Spare Parts website for the order codes of
the boards.
7.2.1 Specifications
Most sets in the TV543 platform use the Integrated Power
Board (IPB) - incl. inverter. The 52" sets in this chassis have a
conventional PSU - with separate inverter.
In this Service Manual, no detailed information is available
because of design protection issues.
7.2.2 Diversity
Below find an overview of the different PSUs that are used:
Table 7-1 Supply diversity
Supplier PSU
LGIT PLHL-T826B
Delta
DPS-298CP-4 A 42PFL7404H/12
Delta
DPS-298CP-2 A 47PFL7404H/12
Delta DPS-411AP-3 A 52PFL7404H/12
LGIT PLHL-T826B
Delta DPS-298CP A
Delta DPS-298CP-4 A 42PFL8404H/12
Delta DPS-298CP-2 A 47PFL8404H/12
7.2.3 Application
An application diagram can be found below:
AC Input
RELAY
PFC
Figure 7-3 Application Integrated Power Board
7.2.4 Power Supply Timing
The STANDBY signal controls the on-mode voltages +12V,
+V and +24V. During chassis cold start from AC mains,
snd
+12V can be expected to be stable within 1.0 seconds, while for
a warm start, i.e. wake up from stand-by power state, this
timing becomes 0.5 seconds maximum. During AC switch off,
stand-by power +3V3-STANDBY decay is at least 20 ms but
not more than 5.0 seconds compared to +12V. Refer to
Figure 7-4:
Model Input Voltage Range
32PFL7404H/12 High Mains (198 to 265 V
High Mains (198 to 265 V
High Mains (198 to 265 V
High Mains (198 to 265 V
32PFL8404H/12 High Mains (198 to 265 V
37PFL8404H/12 High Mains (198 to 265 V
High Mains (198 to 265 V
High Mains (198 to 265 V
Inverter
To Lamps
+12V
Vo=400V
Audio Supply (+12V)
+24V
STANDBY
(HIIGH=OFF, LOW=ON)
Flyback
+3V3_STANDBY
Non- Isolated/Hot Isolated/Cold
18440_208_090226.eps
Circuit Descriptions
Vin AC
STANDBY
+3V3-STANDBY
+12V, +Vsnd, +24V
7.2.5 Power Supply Protection
Power supply protection is implemented via the stand-by
controller of the PNX8543 via the following signals:
• POWER-OK: signal from PSU to indicate if the supply
output from the IPB is normal
• DETECT1: signal to indicate if the +5V, +3V3 and +1V2
voltages on the chassis are present
• DETECT2: signal to indicate if the +12V voltage on the
chassis is present.
)
AC
7.3 DC-DC Converter
)
AC
)
AC
) Input power is obtained from the IPB module via the following
AC
voltages:
)
AC
) • +3V3-STANDBY (stand-by-mode only)
AC
) • +12V (on-mode)
AC
) • +V
AC
snd
• +24V (bolt-on power) (on-mode).
Control is achieved by the PNX8543 controller via the
STANDBY signal.
Audio power is specifically for audio supply usage only and
does not go through any DC conversion.
Below find a block diagram of the on-board DC-DC converters.
+12V
090327
+3V3-STANDBY
Q548.1E LA
Max 1.0sec Max 0.5 sec
Figure 7-4 PSU Timing Diagram
(audio power) (on-mode)
NCP5422 + 2x
Si4936
(Sync Dual
Controller
+ Dual FETs)
LD1117
(Linear Regulator)
LD1117
(Linear Regulator)
ST1S10
(Sync Power IC)
ST1S10
(Sync Power IC)
LD3985M
(Linear Regulator)
Figure 7-5 DC-DC converters
7. EN 41
Min 20 msec
Max 5.0 sec
18440_209_090226.eps
090227
+1V2-PNX8543
+3V3
+1V8-PNX8543
+1V8-PNX5100
ENABLE-3V3
+5V_+5V5-TUN
+1V2-PNX5100
+1V2-STANDBY
18440_210_090227.eps
090227
2009-Apr-03