LGD FHD LGP37C-12HPC EAY62788701 SMPS board schematic, connector voltages, test method
Power
Supply Unit LGD : LGP37C-12HPC AC 100V
to AC 240V Used in 37 inch LGE LCD TV
Part code : LGD EAY62788701
80A
zero-peak max.
At
cold start and any specified line, load, and temperature Conditions. The power supply efficiency should be more
than 80% at the 90Vac maximum load condition, but it meet more than 85%
excepted Inverter parts.
Power
Factor over than 0.9 at 90 – 264Vac & max load condition.
On
Condition: In a moment of Power-ON Signal activated, the current of 3.5V output
should be limited within 40mA(Max) at LCD TV condition for stability. [Do not turn “Power-ON” Signal on at the load
condition of 3.5V output, more than 40mA.]
*
Total regulation for each output circuit includes the results of input voltage variation,
load variation, warm-up drift and temperature change.
*
The following instruments shall be used for measuring ripple noise.
1.
Probe having impedance ratio of 1:1.
2.
Oscilloscope having frequency characteristic of 100MHz or more.
[Ripple
and noise are measured at the end of output cable which are added a 0.1uF
ceramic capacitor and 47uF electrolytic capacitor ( connected parallel ) . (
connected parallel )]
Burn-in
More
than 30 minutes at 45℃(±5℃), Normal input voltage.
AC
on/off must be test 1 time after burn-in.
80%
Load of specification.
Protection
*
This Power Supply has above-mentioned protections.
*
Short circuit protection between different output terminals is not considered.
*
Trip point for over voltage indicates the operating point when the output
voltage slowly increases.
*
The conditions of Over Current measurement
Multi
output [3.5V, 12V, 24V] is normal load state except an over current
measurement.
Sound Noise Characteristics.
PSU
Noise Specification
22.5
dB(a) / 20.u Pa 2.0E-5 Pa
(1/1
octave, A-weighting, to 1khz ~ 16khz Total overall)
Measure
Location: Anechoic Room
Measure
Condition: At a distance of 60cm mike
Full
white pattern, at AC 110V/220V
The
max specification
(Measure
3 points, at PSU centre and left & right on the side)
Connectors Usage and voltages
Test methods
Intermittent
Operation stability Test: The switching
regulator shall ON/OFF for 20,000 time at an Interval of 10 sec at maximum
load, after that electrical Characteristics shall be satisfied.
Low
temperature operation: The switching
regulator is left at the operating guarantee Minimum temperature for 2 hours
without applying electricity. After that
that power shall be turned on, and then the electrical Characteristics shall be
satisfied.
Low
temperature Storage test Leave At low temperature: The switching regulator is left at minimum
storage Temperature for 96 hours or more.
Then the switching regulator is left at a room temperature and humidity
for 1 hour or more, after that electrical characteristics shall be satisfied.
Heat
cycle storage test: Then the switching regulator is left at a room temperature
and humidity for 1 hour or more, after that electrical characteristics shall be
satisfied.
Heat
shock test: Heat shock test performed under following conditions without
applying electricity and then leave them at room temperature and humidity for 1
hour or more.
After
that, electrical characteristics shall be satisfied.
Condition:
-45℃ (30minutes),
120℃(30minutes),
Switching
time: Less than 5 minutes, 200 cycles.
Schematic Diagram
Block diagram
