Philips 32HFL3331/93 Service Manual page 24

EN 24 7. TCM3.1A LA
7.3.3 IPL42L PSU
Block Diagram
P F C o u tp u t
A C
P F C IC
R e la y
In p u t
L6562A
(ST)
P S -O N
Figure 7-4 Block diagram IPL42L PSU
Key Components
The key component ICs are:
• Stand-by power supply IC: FSQ510 (Fairchild).
• PFC control IC: L6562 (ST).
• 24V PWM control IC: FA5571N (FUJI).
• Inverter high voltage control IC: OZ9926 (O2).
Control Signals
Table 7-4 Control signals
Control signal Comments
PS-ON 5.0V >= ON >= 2.0V AC power output ON
1.0V >= OFF >= 0V
BL_ON 5.0V >= ON >= 2.0V The inverter is working
1.0V >= OFF >= 0V
Burst dimming freq. / duty
PWM Dimming High level: 2V ~ 5.0V
Low level: 0V ~ 0.7V
Output Characteristics
Table 7-5 Output characteristics
Output Voltage Tolerance Min. current Max. current
+3V3 +/- 5%
24V +/- 5%
Fault Finding
Normal PSU working order:
• Connect the 220V AC power plug.
• The 3.3V Stand-by power supply (Stand-by uP U801) will
start. This is a "single-ended flyback regulator". For a good
functioning of this part, check the availability of 1.25V on
U803 (TL431).
• On connector P802, signal line "PS_ON" will go "high"
(3V3) and relay K801 will be activated.
• Also capacitors C811/C812 will be charged, supplying
IC806 with electricity. This will start the PFC circuit and
generate the +24 V control.
• Now, IC805 will start, and will generated the 24V output.
• On connector P802, signal "DIM" sets the PWM dimming
status.
• On connector P802, when signal "BL-ON" goes "high", the
high voltage Inverter (IC901, OZ9926A) will start.
2010-Jun-25
Circuit Descriptions
D IM
IN V E R T E R
3 9 5 V
IC OZ9926A
(O2)
E NA B LE
S w itc h c o n tro l
B L-O N
Vo lta g e D e te c t
P W M P ow er
S upply IC
FA 5571
(F U JI)
S T B P ow er
S upply IC
F S Q 510
(FA IR C H ILD
18520_214_090319.eps
Output
AC power output OFF
The inverter is switched OFF
100 - 200 Hz / 10 - 100%
Load regulation
5 mA 300 mA +/- 5%
0.5 A 2.5 A +/- 5%
7.3.4 IPL47L PSU
Block Diagram
+H V
A C
R e la y
In p u t
- H V
2 4 V
3 .3 V
090319
Figure 7-5 Block diagram IPL47L PSU
Key Components
The key component ICs are:
• Stand-by power supply IC: FSQ510 (Fairchild).
• PFC control IC: UC28060 (TI).
• 24V PWM control IC: FA5571N (FUJI).
• Inverter high voltage control IC: L6501 (MicroSemi).
Control Signals
Table 7-6 Control signals
Control signal
PS-ON
BL_ON
Burst dimming freq. / duty
PWM Dimming
Output Characteristics
Table 7-7 Output characteristics
Output Voltage Tolerance Min. current Max. current
+3V3
24V
Fault Finding
For a start-up description, refer to the IPL42L PSU Fault
Finding section. The behaviour of this PSU is comparable, only
different components.
Some extra tips:
• No 24V output. First of all, check on UC804 (UC28060)
the VCC pin voltage: this must be greater than 12.5V
(continuous voltage greater than 10.5V).
At the same time monitor the driver outputs GDA or GDB.
If there is no output, then the IC is suspected. However, if
the output can not be sustained, then the protection(s) of
the IC are suspected (it has two output over-voltage
protections, an over-current protection, an over-load
protection, and an open-loop protection.).
• Secondary rectifier diode D841 damaged. Fault
situation: No 24V output on IC FA5571, continues to
restart.
P F C o u tp u t
IN V E R T E R
3 9 5 V
IC L6501
P F C IC
(M IC R O S E M I)
U C 28060
(T I)
E NA B LE
S w itc h c o n tro l
B L-O N
Vo lta g e D e te c t
P W M P ow er
S upply IC
FA 5571
P S -O N
(F U JI)
S T B P ow er
S upply IC
F S Q 510
(FA IR C H ILD
Comments
5.0V >= ON >= 2.0V AC power output ON
1.0V >= OFF >= 0V
5.0V >= ON >= 2.0V The inverter is working
1.0V >= OFF >= 0V
100 - 200 Hz / 10 - 100%
High level: 2V ~ 5.0V
Low level: 0V ~ 0.7V
+/- 5% 5 mA 300 mA
+/- 5% 0.5 A 2.5 A
D IM
+H V
- H V
2 4 V
3 .3 V
18520_213_090319.eps
090319
Output
AC power output OFF
The inverter is switched OFF
Load regulation
+/- 5%
+/- 5%