Partial Block Description; Power Board Block Description - Samsung HLS5087WX/XAA Service Manual

Circuit Description

13-2 Partial Block Description

13-2-1 Power Board Block Description

1. What is SMPS?
This is an acronym for Switching Mode Power Supply and this is responsible for receiving AC input voltage
(Line frequency: 50HZ~60HZ) and supplying insulated DC output.
2. SMPS Components
1) Standby Power: A combination of ICS801 (SWITCHING IC) and TS801S (TRANS) that supplies STAND-BY 5V for operating
the Micom.
2) Multi Power: The voltage supplied when the power is turned on.
It is a combination of IC801S and T801S that supplies various voltages including D12V, A6.5V, S14.5V, T30V and
A65V.
3. SMPS Operation
1) SMPS System: Uses Fly-Back technology for both standby and multi power.
2) Operation: Fly-Back is one of the most popular power-supply systems and uses less power than 200W as well as being the
cheapest of all multi output SMPS systems.
Let's have a look at how it operates...
a. Converts AC input into DC (HOT) (rectifies to DS801 before smoothing to CS801)
b. The converted DC voltage is high, especially compared to ground, so touching it will cause electric shock.
Use T801S (Trans) to insulate the secondary voltage and take advantage of the PWM operations of T801S
and IC801S to induce it.
c. The secondary induced voltage is a dozen-KHZ square wave power, which goes through the smoothing
cap (CS822) to be generated in the standby 5V.
d. Multi power also operates the same way.
※Options are deleted on the ATSC only Model
13-2
Option
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