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ZXSC400E6TA Datasheet(PDF) 5 Page - Diodes Incorporated |
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ZXSC400E6TA Datasheet(HTML) 5 Page - Diodes Incorporated |
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5 / 16 page  APPLICATIONS INFORMATION Switching transistor selection The choice of switching transistor has a major impact on the converter efficiency. For optimum performance, a bipolar transistor with low VCE(SAT) and high gain is required. The VCEO of the switching transistor is also an important parameter as this sees the full output voltage when the transistor is switched off. Zetex SuperSOT™ transistors are an ideal choice for this application. Schottky diode selection As with the switching transistor, the Schottky rectifier diode has a major impact on the converter efficiency. A Schottky diode with a low forward voltage and fast recovery time should be used for this application. The diode should be selected so that the maximum forward current rating is greater or equal to the maximum peak current in the inductor, and the maximum reverse voltage is greater or equal to the output voltage. The Zetex ZHCS Series meet these needs. Combination devices To minimise the external component count Zetex recommends the ZX3CDBS1M832 combination of NPN transistor and Schottky diode in a 3mm x 2mm MLP package. This device is recommended for use in applications using 1 to 4 white LEDs. The IC is also capable of driving MOSFETs. Zetex recommends the ZXMNS3BM832 combination of low threshold voltage N-Channel MOSFET and Schottky diode in a 3mm x 2mm MLP package. This device is recommended for use in applications using 1 to 8 white LEDs. Capacitor Selection A small value, low ESR ceramic capacitor is required to filter the output, typically 1 F to 4.7 F. Generally an input capacitor is not required, but a small ceramic capacitor may be added to aid EMC, typically 1 F to 4.7 F. Inductor Selection The inductor value must be chosen to satisfy performance, cost and size requirements of the overall solution. Inductor selection has a significant impact on the converter performance. For applications where efficiency is critical, an inductor with a series resistance of 250m or less should be used. A list of recommended inductors is listed in the table below: ZXSC400 ISSUE 1 - JANUARY 2003 5 Part No. Manufacture L I PK (A) R DC ( ) CMD4D11-100MC Sumida 10 H 0.5 0.457 CMD4D11-220MC Sumida 22 H 0.4 0.676 LPO2506OB-103 Coilcraft 10 H 1.0 0.24 ST2006103 Standex Electronics Inc 10 H 0.6 0.1 |
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