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Circuit Description
1. Summary
This is a service manual about the explanation of basic operation in power circuit (1H309W) for 50" PDP.
2. Input Part
This switching mode power supply (SMPS) has the input voltage range of 90 ~ 264[Vac].
Thus, at 90[Vac] input condition or any voltage level in a spec, the power board must operate even if the ac source is cut off and
re-input ON.
3. Output Part
This power circuit has the 10 outputs. In steady state, the specification about the output's voltage and current is the same as
following Table 1.
Table 1. PDP SMPS's output specifications (for 50")
Nominal
Output
Voltage
Circuit
[V]
Vs
210
Va
70
D5.3V
5.3
A6.5V
6.5
FAN_8V
8
Vg
15
12V
12
Vamp
18
Vt
33
STBY
5.0
① Over Voltage Protectionl
This power circuit has the function of over voltage protection (O.V.P) in all outputs.
In condition of any over voltage in each output ports, the power supply is shut-down by O.V.P function for the protection of
part's damage.
② Short / Over Current Protection
Because any output ports have small impedance (smaller than 300m ohm) at the output short condition, power circuit was
designed to have the function of short / over current protection (O.C.P) in all outputs. Thus, in condition of any over current in
each output ports, the power supply is shut-down by O.C.P function for the protection of part's damage. The specification
about the O.C.P in each port is the same as following Table 2.
Table 2. OCP specification
Protection
Output Circuit
Over Current
Output except Vs&Va
13-6
Voltage
Total
Adjustment
Regulation
[V]
190 - 220
± 2%
60 - 80
± 2%
----------
± 5%
----------
± 5%
----------
± 5%
----------
± 5%
----------
± 5%
----------
± 10%
----------
± 5%
----------
± 5%
Trip point
Vs
3.0 - 6.0A
Va
3.5A or more
----------
Nominal
Load
Load
Variation
[A]
[A]
1.7
0.1 - 2.5
0.7
0.1 - 3.0
3.5
0.1 - 5.0
1.5
0.01 - 3.0
-
0.01 - 0.2
0.5
0.01 - 1.0
1.3
0.01 - 1.5
0.1
0.01 - 2.5
5m
1m - 6m
0.5
0.01 - 1.0
Notes
Shut down by Under Voltage
Short Circuit Protection
Shut down by Under Voltage
Peak
Ripple
Current
Noise
[A]
[mV p-p]
10.0
800
4.5
500
6.0
50
4.0
50
0.5
120
1.5
120
3.0
120
3.0
180
7m
300
1.5
50
Samsung Electronics
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Troubleshooting
