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MPDTH05010WAH Datasheet(PDF) 6 Page - Murata Manufacturing Co., Ltd. |
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MPDTH05010WAH Datasheet(HTML) 6 Page - Murata Manufacturing Co., Ltd. |
6 / 6 page MPDTH_10 Series.A04 Page 6 of 6 Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com MPDTH***10 Series Adjustable Non-isolated 12/15-Amp POLA DC/DC Converters Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without notice. © 2009 Murata Power Solutions, Inc. USA: Mansfield (MA), Tel: (508) 339-3000, email: sales@murata-ps.com Canada: Toronto, Tel: (866) 740-1232, email: toronto@murata-ps.com UK: Milton Keynes, Tel: +44 (0)1908 615232, email: mk@murata-ps.com France: Montigny Le Bretonneux, Tel: +33 (0)1 34 60 01 01, email: france@murata-ps.com Germany: München, Tel: +49 (0)89-544334-0, email: munich@murata-ps.com Japan: Tokyo, Tel: 3-3779-1031, email: sales_tokyo@murata-ps.com Osaka, Tel: 6-6354-2025, email: sales_osaka@murata-ps.com China: Shanghai, Tel: +86 215 027 3678, email: shanghai@murata-ps.com Guangzhou, Tel: +86 208 221 8066, email: guangzhou@murata-ps.com Singapore: Parkway Centre, Tel: +65 6348 9096, email: singapore@murata-ps.com Murata Power Solutions, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A. Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356 www.murata-ps.com email: sales@murata-ps.com ISO 9001 and 14001 REGISTERED 03/26/09 APPLICATION NOTES Tracking Input When enabled, the tracking function allows the output to follow an external analog signal presented at the Tracking input. This pin becomes active approximately 50 mS after the input voltage has been applied and the con- verter reaches regulation. External track inputs must be referred to Ground. Several converters may be Tracked in parallel to generate outputs which rise and fall together. The Tracking input range is zero Volts up to the nominal set-point output voltage. If the Tracking input rises above the Vout nominal voltage, Vout will remain at the set point after the power up ramp. If Track is unused, it should be connected to +Vin. Please note that because of the Under Voltage input lockout feature (UVLO), the output cannot follow Track In during power up. Also, the Track feature is disabled whenever the converter is in Inhibit (OFF) mode. Over-Current Output Protection If excess current is drawn from the converter, the output will shut down and then periodically attempt to restart with narrow full power cycles. If the excess load is reduced to within the rated maximum load, the converter will immediately restart and operate normally. If the load is still too great, another power-down cycle will begin. This is called “hiccup” operation. It significantly reduces the output power to avoid damage. The converter will quickly and automatically recover once the load is reduced. Pre-Bias Operation The MPDTH_WAH/WAS series of converters use synchronous rectification in their output circuits. Normally, synchronous rectification may cause excess current being sunk back in to the converter if there is higher external output voltage present. If such prebias voltage is present on the output at the time of startup, the converter will operate in a manner which avoids excessive reverse current being sunk back into the output. This pre-bias protection will continue until the converter achieves normal regulation at its set-point output voltage. In order to achieve successful pre-bias voltage protection, several conditions must be met: [1] The pre-bias voltage must be lower than the expected final set-point output voltage. If the pre-bias voltage remains higher than the set-point and is capable of back-driving excess current, possible output damage may occur. If the pre-bias voltage has high impedance or has very limited current capability, normal startup will proceed. [2] Tracking operation must not be used during pre-bias startup. The Track- ing input should be either open or connected to Vin so that normal soft start will proceed. After successful startup of approximately 50 mSec, Tracking may be resumed. [3] Carefully examine any output circuits with large external output capaci- tors and low-ESR. If there is no bleeder circuit or other method to reduce the stored voltage AND the cap voltage is higher than the expected set-point, operation may fail or the output may be damaged. Smaller capacitors with lower energy storage should not interfere with startup. See the recom- mended Connection Diagram. Use only as much output capacitance as needed. Also be careful immediately turning the converter back on after the Inhibit control turns the converter off. Any energy stored in larger output capacitors may cause the problems described above. Margin Up/Down Controls Ground each Margin control to increase or decrease the output voltage by ±5% from its setpoint value. If not needed, leave the margin controls uncon- nected (open). The margin controls are analog inputs and are not logic compatible. If a switch is not used to ground, a small signal transistor (such as an n-channel MOSFET with low off-state leakage) will work if biased fully into either pinchoff/ cutoff or saturation. Sink current is approximately -8 mA when ON and the open circuit voltage is approximately 0.8 Volts when OFF. Do not ground both margin controls simultaneously. For output changes less than ±5%, insert an additional resistor in series with the switch or transistor to ground. The margin adjustment equation is: R-up or R-down (in KΩ) = (499 / delta%) – 99.8 Where “delta%” is the desired change in percent of Vout up or down relative to the set-point output. Be sure to use low tempco precision resistors. |
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