CR6202 Просмотр технического описания (PDF) - Unspecified

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CR6202

Switching Power Supply Controller ICs

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CR6202

function of over voltage, by which the voltage feedback function of the front terminal can be accomplished

conveniently, the rising phenomenon of the output voltage in large extent can be avoided when the open-loop is

output, so as to guarantee the security of the load. Because of the existence of this characteristic, the design of

VCC shall be kept at the proper range, so as to avoid VCC rising excessively high when the output is high, and

make the output voltage escape from 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 typical maximum limit value of switching current for CR6202 is 0.25A. When designing a flyback

power with 80V of emitter voltage, it can accomplish the output power of more than 5W 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

2

elimination ability greatly. For an input of 85-265V, the typical application of 5W output and 100mm copper

foil are necessary.

Aug.2008 V2.0

10/14

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