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MSK5046-5.0KRH Datasheet(PDF) 4 Page - M.S. Kennedy Corporation |
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MSK5046-5.0KRH Datasheet(HTML) 4 Page - M.S. Kennedy Corporation |
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4 / 10 page  APPLICATION NOTES CONT'D PRELIMINARY Rev. G 2/06 4 SENSE: ENABLE FUNCTION: The ENABLE pin of the MSK 5046RH is designed for open collector drive. Leaving the pin open will allow for normal operation. Pulling the pin low will shut the de- vice down. The enable pin will source up to 3mA when pulled low with high line voltage. It is very important that the DC voltage returned to the SENSE pin from the output be as noise and oscilla- tion free as possible. This voltage helps to determine the final output and therefore must be a clean voltage. Excessive noise or oscillation can cause the device to have an incorrect output voltage. Proper PC board lay- out techniques can help to achieve a noise free voltage at the SENSE pin. CURRENT LIMIT: The MSK 5046RH current limit is user programmable by means of an external low value sense resistor. The current limit trips at approximately 100mV, ±20% across the sense resistor. The output voltage will decrease when the current limit is reached. In the case of a sudden and severe overload, the MSK 5046RH will reset and attempt a restart cycle. In noisy systems, the use of a twisted pair helps reduce noise succeptability of the sense cir- cuit. The voltage present on the sense resistor will have an AC component at the switching frequency. The peak of the AC plus DC voltage will trip the current fault. If current limit is not desired, simply connect CS+ to ground and CS- to VOUT to disable the current sense. ADJUST: The output voltage of the MSK5046RH may be ad- justed up or down to accomodate a variety of system requirements. Connecting a resistor between the adjust pin and the sense pin will decrease the output voltage. Connecting a resistor between the adjust pin and ground will increase the output voltage. MINIMUM LOAD: The MSK 5046RH requires less than 2mA minimum load to maintain regulation. Minimum loads greater than 200mA at low line voltage and 400mA at high line volt- age provide faster load response. |
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