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SRS20A12W50 Datasheet(PDF) 2 Page - MicroPower Direct, LLC |
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SRS20A12W50 Datasheet(HTML) 2 Page - MicroPower Direct, LLC |
2 / 4 page Model Selection Guide Notes: 1. Measured over a bandwidth of 5 Hz to 20 MHz using a 1 µH inductor. 2. Output ripple is measured at 20 MHz bandwidth using a 1.0 µF ceramic capacitor and a 10 µF tantalum capacitor connected in parallel as close to the output terminals as possible. 3. Transient recovery is measured to within a 200 mV error band for a 50% load change. 4. The “Power Good” signal is optional. To include this, add a “P” to the product number (SRS20A-12W-5.0P). If it is not included, then pin 6 is not installed. 5. These units include a non-latching over temperature protection circuit. If the temperature exceeds approximately 130°C at the monitored “hot spot”, the unit will be shut down. When the temperature decreases, the unit will automatically restart. See page 3 for temperature measurement information. 6. These units will provide up to 150% of rated current. In the event of an over current fault, the unit will go into hiccup mode until the fault is removed. 7. Standard units feature an active high remote control input. See the note and diagram at right. 8. These units do not include an internal fuse. It is recommended that an external slow-blow fuse be used with a rating as shown in the table above. 292 Page Street Ste D Stoughton, MA 02072 • TEL: (781) 344-8226 • FAX: (781) 344-8481 • E-Mail: sales@micropowerdirect.com www.micropowerdirect.com Model Number Input Output Efficiency (%, Typ) Capacitive Load (µF Max) Fuse Rating Slow-Blow (A) Voltage (VDC) Current (mA) Voltage (VDC) Current (A, Max) Current (A, Min) Range Full-Load No-Load SRS20A-12W-5.0 6.0 - 14.0 1,603 40 0.75 20.0 0.0 78 8,000 25 2,381 50 1.20 84 2,874 50 1.50 87 3,409 50 1.80 88 3,745 60 2.00 89 4,630 65 2.50 90 5,978 75 3.30 92 6.5 - 14.0 8,865 95 5.00 94 Remote On/Off These units include an active high On/OFF control input. The unit is “ON” if the input to the control pin (pin 11) is high; or if the pin is left open (or floating). The signal level of the control input is referenced to ground. A recommended drive circuit for the control pin is shown at left. The resistors R1 & R2 have been added to help reduce pos- sible false triggering of the control input due to leakage currents. Units are available with an active low control input. With this input, the unit will remain off if the con- trol input remains above 2.8 VDC. For more information on the active low option, contact the factory. Notes: Fuse: SRS20A-12W regulators do not include an internal fuse. For safety and protection, a external slow-blow fuse should be placed in the input (+VIN) line. A 25A fuse is recommended. Input Filter: The unit must be connected to a low AC impedance source, and to avoid loop stability issues, the source inductance should also be low. To significantly reduce ripple caused by the switching action of the POL, the SRS20A-12W includes onboard filtering. However, adding input capacitors C1 and C2 will further reduce ripple currents (C1) and high frequency noise spikes (C2). These capacitors should be placed as close to the input pins as possible (see board layout at right). It is recommended that low ESR (<100 m ) and low ESL ceramic capacitors be used. Recommended values are: C1 C2 33 µF to 250 µF 0.01 µF Remote ON/OFF: See note above Typical Connection Output Trim: See note on page 4 Remote Sense: The remote sense helps regulate the output voltage at the point of load by minimizing the effects of distribution losses. The voltage between the sense pin (Pin 3) and the point of load should not exceed 500 mV. When using the remote sense function, the output voltage level may rise. Care must be taken not to exceed the maximum rated output power of the regulator. When not in use, the remote sense pin should be tied to the output pin of the regulator. Output Filter: Output filtering is not required, but may be used to further reduce output ripple & noise; or to adjust the transient response time of the unit. Care must be taken not to exceed 8,000 µF, the maximum value of output capacitance the unit is rated for. The values given in the connection dia- gram are typical for light filtering. |
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