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SLC100-12 Arkusz danych(PDF) 5 Page - Murata Power Solutions Inc. |
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SLC100-12 Arkusz danych(HTML) 5 Page - Murata Power Solutions Inc. |
5 / 9 page 5 SLC100 Rev B 5/2004 Figure 1 – Remote Sensing Output Voltage Trim The SLC100’s output voltage may be adjusted high or low by an amount indicated on the product data sheet. As shown in Figure 2, to raise the converter’s output voltage a resistor must be placed between the Trim pin and +Vout pin. Figure 2 – Trim Up Circuit Remote Sense SLC100 + Sense - Sense Trim + Vout - Vout + Vin ON/OFF - Vin (Top View) Load C L C B C B SLC100 + Sense - Sense Trim + Vout - Vout + Vin ON/OFF - Vin (Top View) Load R T When the load is physically distanced from the con- verter, the inductance of the power leads, and any by- pass conductance at the load, can result in increased phase shift in the converter’s feedback loop, causing instability. This situation can be eliminated by inserting bypass capacitors (C B) from the outputs to the sense leads directly at the output pins. These capacitors de- couple any AC on the power lines and assure that only the DC voltage is sensed. When using remote sense with dynamic loads, the transient response at the point of load may be limited by the inductance present in the power lines. Severe load steps may require the addition of a capacitor C L across the output lines. When the load demands an immediate increase in load current, this capacitor helps to supply a portion of the current and reduces the bur- den on the converter. In general, the line resistance, or load drop, between the output pins of the converter and load should be minimized. Using remote sense, a large line resistance, with a regulated load voltage, will result in a higher output voltage at the output of the DC/DC Converter. To prevent exceeding the converter’s output power limits, a higher output voltage will require a reduction in the maximum allowable output current in accordance with the voltage/current power relationship. To minimize the line resistance between the converter and the load, the converter should be placed as close to the load as possible. Line resistance can further be decreased by using heavy gauge wire or by increasing the cross sec- tional area of the PC board traces. The remote sense feature of the SLC100 can be used to compensate for voltage drops in the output power lines by sensing output voltage directly at the point of load. To enable this feature, connect the +Sense and –Sense pins to the +Vout and –Vout pins, respectively, at the point in the circuit where the tightest regulation is required (Figure 1). The sense leads conduct very little current compared with the power leads and there- fore provide a more accurate indication of load voltage for regulation purposes. This enables the converter to increase (or decrease) its output voltage to compensate for any load distribution losses, allowing for a more precise load voltage. Refer to the product data sheet for the maximum output voltage compensation range of APPLICATION NOTES If remote sensing is not desired then +Sense and -Sense must be tied to their respective outputs for proper operation. • • |
Podobny numer części - SLC100-12 |
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Podobny opis - SLC100-12 |
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