Circuit Descriptions
EN 52 Q552.1E LA7.
2010-Feb-19
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PSL stands for Power Supply with integrated LED-drivers.
PSLS stands for a Power Supply with integrated LED-drivers
with added Scanning functionality (added microcontroller).
PSDL stands for a Power Supply for Direct-view LED backlight
with 2D-dimming.
7.2.3 Connector overview
Table 7-2 Connector overview
7.3 DC/DC Converters
The on-board DC/DC converters deliver the following voltages
(depending on set execution):
• +3V3-STANDBY, permanent voltage for the standby
controller, LED/IR receiver and controls; connector 1M95
pin 1
• +12V, input from the power supply for TV550 common
(active mode); connector 1M95 pins 6, 7 and 8
• +24V, input from the power supply for DVB-S2 (in active
mode); connector 1M09 pins 1 and 2
• +1V1, core voltage supply for PNX85500; has to be started
up first and switched off last (diagram B03B)
• +1V2, supply voltage for analogue blocks inside
PNX85500
• +1V8, supply voltage for DDR2 (diagram B03B)
• +2V5, supply voltage for analogue blocks inside
PNX85500 (see diagram B03E)
• +3V3, general supply voltage (diagram B03E)
• +5V, supply voltage for USB and CAM (diagram B03E)
• +5V-TUN, supply voltage for tuner (diagram B03E)
• +V-LNB, input voltage for LNB supply IC (item no. 7T50)
• +5V-DVBS, input intermediate supply voltage for DVB-S2
(diagram B08A)
• +3V3-DVBS, clean voltage for silicon tuner and DVB-S2
channel decoder
• +2V5-DVBS, clean voltage for DVB-S2 channel decoder
• +1V-DVBS, core voltage for DVB-S2 channel decoder.
A +12 V under-voltage detector (see diagram B03C) enables
the 12V to 3.3V and 12V to 5V DC/DC converters via the
ENABLE-3V3-5V line, and the 12V to 1.8V DC/DC converter
via the ENABLE-1V8 line. DETECT2 is the signal going to the
standby microcontroller and ENABLE-3V3n is the signal
coming from the standby microcontroller.
Diagram B03D contains the following linear stabilizers:
• +2V5 stabilizer, built around item no. 7UCO
• +5V-TUN stabilizer, built around items no. 7UA6 and 7UA7
• +1V2 stabilizer, built around items no. 7UA3 and 7UA4.
Diagram B08A contains the DVB-S2-related DC/DC
converters and -stabilizers:
• a +24V under-voltage detection circuitry is built around
item no. 7T04
• the switching frequency of the 24 to 14...20V switched
mode converter is 350 kHz (item no. 7T03 and +V-LNB
lines)
• the output signal on the +V-LNB line goes to the LNBH23Q
(item no. 7T50)
• the LNBH23Q (item no. 7T50) sends a feedback signal via
the V0-CNTRL line
• the switching frequency of the +5V-DVBS to +1-DVBS
switched mode converter is 900 kHz (item no. 7T00)
• a delay line for the +2V5-DVBS and +1V-DVBS lines is
created with item no. 3T03 (R=10k) and 2T06 (C=100n)
• a 3.3V to 2.5V linear stabilizer is built around item no. 7T01
• a 5V to 3.3V linear stabilizer is built around item no. 7T02.
Diagram B08B contains the DVB-S2 LNB supply:
• the +V-LNB signal comes from item no. 7T03
• the V0-CTRL signal goes to item no. 7T03
• the LNB-RF1 goes to the LNB.
Figures gives a graphical representation of the DC/DC
converters with its current consumptions:
Figure 7-7 DC/DC converters xxPFL5xxx series
Figure 7-8 DC/DC converters xxPFL6xxx series
Figure 7-9 DC/DC converters DVB-S2 devices
Connector
no. 1308 1311 1319 1316 1M95 1M99 1M09 1MP1
Descr. mains mains disp. disp. to SSB to SSB Amb. T-con
Pin CN1 CN2 CN3 CN4 CN5 CN6 CN7 CN8
1 N L’ 3V3std +12V 24Vb +12V
2 L L” Stndby +12V 24Vb +12V
3----GND1GND1GND1n.c.
4----GND1GND1GND1GND1
5----GND1BL_ON
_OFF
- GND1
6----+12VDIM--
7----+12VBoost--
8----+12Vn.c.--
9----+VsndPOK--
10----GND_
SND
---
11----n.c.---
12--------
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