THX203H datasheet(11/21 Pages) ETC

部件名	THX203H

功能描述	Switching Power Controller IC

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制造商	ETC [List of Unclassifed Manufacturers]

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PWM Controller of High-performance Current Mode

THX203H

decreasing when IC over-voltage limit

works.

6. Maximum switching current limit

IC has the function of current limit

cycle by cycle. It will test every

switching current in every switching

cycle, if the current fixed by FB or upper

limit current prevention is reached, it

will come into the close cycle, and the

detection of the current has the function

of real-time foreland hide, it can shield

the switching peak, and avoid the wrong

detection of the switching current. Then

the reasonable temperature compensation

eliminates the influence of temperature,

comparing with normal MOSFET (the

alteration of Ron will be large when the

temperature changes) switching chip, the

switching current can always be very

accurate in a larger range, thus not too

much allowance is needed to match a

larger working temperature range for the

designer when he designs the scenario,

and the security of the circuit for use can

be improved.

The

maximum

limit

value

of

switching current for THX203H is 0.80A.

When designing a flyback power with

80V of emitter voltage and 0.65A of

switching current, it can accomplish the

output power of more than 12W easily,

and meet the broad temperature range.

7. Requirement of heat elimination

As for a typical power switch, it must

have

necessary

heat

elimination

measures, so as to avoid that the

excessive heat leads to heat protection.

The primary heat inside IC is produced

by the on-off wasting of the switching

tube, so appropriate heat elimination

position is Pin7-8 pin of IC, one wieldy

way is to pave PCB copper foil of a

certain area on Pin7-8 pin, what’s more,

plating tin on the copper foil will

improve the heat elimination ability

greatly. For an input of 85-265V, the

typical application of 12W output and

200mm2 copper foil are necessary.

Reference wiring is as the following

figure:

Typical application circuit(input 85-265V, output 12V 1A):

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