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YNC14S20A-DG Datasheet(PDF) 6 Page - Power-One |
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YNC14S20A-DG Datasheet(HTML) 6 Page - Power-One |
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6 / 28 page  OCT 12, 2006 revised to APR 23, 2007 Page 6 of 28 www.power-one.com YNC12S20 DC-DC Converter Data Sheet 9.6-14 VDC Input; 0.7525-5.5 VDC Programmable @ 20 A Vin Vin Rw Rw Rload Vin GND ON/OFF (Top View) Converter TRIM SENSE Vout Nex -c Series TM Fig. B: Remote sense circuit configuration. Because the sense lead carries minimal current, large traces on the end-user board are not required. However, sense traces should be located close to a ground plane to minimize system noise and ensure optimum performance. When utilizing the remote sense feature, care must be taken not to exceed the maximum allowable output power capability of the converter, equal to the product of the nominal output voltage and the allowable output current for the given conditions. When using remote sense, the output voltage at the converter can be increased up to 0.5V above the nominal rating in order to maintain the required voltage across the load. Therefore, the designer must, if necessary, decrease the maximum current (originally obtained from the derating curves) by the same percentage to ensure the converter’s actual output power remains at or below the maximum allowable output power. Output Voltage Programming (Pin 3) The output voltage can be programmed from 0.7525V to 5.5V by connecting an external resistor between TRIM pin (Pin 3) and GND pin (Pin 5); see Fig. C. A trim resistor, RTRIM, for a desired output voltage can be calculated using the following equation: 1 0.7525) - (V 5 . 10 R REQ - O RIM T − = [k Ω] where, = TRIM R Required value of trim resistor [k Ω] = −REQ O V Desired (trimmed) output voltage [V] Vin R TRIM Rload Converter Vin GND ON/OFF (Top View) TRIM Vout SENSE Nex -c Series TM Fig. C: Configuration for programming output voltage. Note that the tolerance of a trim resistor directly affects the output voltage tolerance. It is recommended to use standard 1% or 0.5% resistors; for tighter tolerance, two resistors in parallel are recommended rather than one standard value from Table 1. The ground pin of the trim resistor should be connected directly to the converter GND pin (Pin 5) with no voltage drop in between. Table 1 provides the trim resistor values for popular output voltages. Table 1: Trim Resistor Value V0-REG [V] RTRIM [kΩ] The Closest Standard Value [kΩ] 0.7525 open 1.0 41.2 41.2 1.2 22.46 22.6 1.5 13.0 13.0 1.8 9.0 9.09 2.0 7.4 7.32 2.5 5.0 4.99 3.3 3.12 3.09 5.0 1.47 1.47 5.5 1.21 1.21 The output voltage can be also programmed by external voltage source. To make trimming less sensitive, a series external resistor Rext is recommended between the TRIM pin and the programming voltage source. Control Voltage can be calculated by the formula: 15 0.7525) - )(V R 1 ( 7 . 0 V REQ - O EXT CTRL + − = [V] where, |
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