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VFB400W-Q48-S5 Datasheet(PDF) 8 Page - CUI INC |
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VFB400W-Q48-S5 Datasheet(HTML) 8 Page - CUI INC |
8 / 10 page cui.com CUI Inc │ SERIES: VFB400W │ DESCRIPTION: DC-DC CONVERTER date 01/30/2014 │ page 8 of 10 (A) Controlling the ON/OFF terminal from the input side. RecommendedR1valueis12KΩ(1.0W)for48V IN and 6KΩ(0.5W)for24V IN (B) Controlling the ON/OFF terminal from the output side.RecommendedR2valueis4.3KΩ(0.1W) 1k AUX -S -ON/OFF +ON/OFF SW Output I(ON/OFF) R2 Figure 6 ExternalDCVoltage Figure 7 Figure 8 APPLICATION NOTES (CONTINUED) +S +V -V -S VR Rt Rt Rt Rt Vf + × + + × × = 33 33 7. 8 6 ) 33 33 ( ) ( 1. 4 2 Vf VR Vo Vout × + =) ( VT VO Vout × = 2. Output Voltage Trimming Leaveopenifnotused. 3. ON/OFF Control Theconverter'sON/OFFfunctioncanbecontrolledfromtheinputsideorfromtheoutputside.Themaximumcurrentthroughthe ON/OFFpinis10mA.TheresistorvaluehastobesetappropriatelytoavoidthemaximumcurrentthroughtheON/OFFpins. Figure 5 External Resistors Trim-Up/Trim-Down Formulas Trim-Up/Trim-Down Formulas Note:Rt=6.8KΩ V O is the nominal output voltage V OUT is the desired output voltage (up or down) VRisthetrimresistorinKΩ Note: V T is the trim terminal voltage V O is the nominal output voltage V OUT is the desired output voltage (up or down) Note: 1.ModelsVFB400W-Q24-S24,S28&S48requireaminimuminputvoltageof13VdcandmodelsVFB400W-Q48-S24,S28&S48requireaminimuminputvoltageof22Vdc in order to trim between 100~110%. For more information, please visit the product page. |
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