Samsung PS-50Q7HD, Руководство по обслуживанию

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13-2-1 Main SMPS
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")
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
Output
Circuit
Nominal
Voltage
[V]
Voltage
Adjustment
[V]
Total
Regulation
Nominal
Load
[A]
Load
Variation
[A]
Peak
Current
[A]
Ripple
Noise
[mV p-p]
Vs 210 190 - 220
±
2%
1.7 0.1 - 2.5 10.0 800
Va 70 60 - 80
±
2%
0.7 0.1 - 3.0 4.5 500
D5.3V 5.3 ----------
±
5%
3.5 0.1 - 5.0 6.0 50
A6.5V 6.5 ----------
±
5%
1.5 0.01 - 3.0 4.0 50
FAN_8V 8 ----------
±
5%
- 0.01 - 0.2 0.5 120
Vg 15 ----------
±
5%
0.5 0.01 - 1.0 1.5 120
12V 12 ----------
±
5%
1.3 0.01 - 1.5 3.0 120
Vamp 18 ----------
±
10%
0.1 0.01 - 2.5 3.0 180
Vt 33 ----------
±
5%
5m 1m - 6m 7m 300
STBY 5.0 ----------
±
5%
0.5 0.01 - 1.0 1.5 50
Protection Output Circuit Trip point Notes
Over Current
Vs 3.0 - 6.0A Shut down by Under Voltage
Va 3.5A or more
Short Circuit Protection
Shut down by Under Voltage
Output except Vs&Va ----------
Circuit Description
13-2 Samsung Electronics
13-2 Partial Block Description