PDF ZXSC400 Data sheet ( Hoja de datos )

Número de pieza	ZXSC400
Descripción	LED DRIVER BOOST CONVERTER
Fabricantes	Zetex Semiconductors
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No Preview Available ! LED DRIVER BOOST CONVERTER ZXSC400 DESCRIPTION The ZXSC400 is a voltage mode boost converter in the SOT23-6 package. Its low feedback voltage allows the current in a chain of LEDs to be set and accurately monitored with a single resistor giving minimal losses. Its excellent load and line regulation means that for the full supply range from lithium-ion cells, the LED current will typically change by less than 1%. Using high efficiency Zetex switching transistors with ratings of 20V and higher allow many LEDs to be chained in series for the best LED current matching possible. FEATURES • 1.8V to 8V supply range • Typical output regulation of Ϯ1% • Over 80% typical efficiency • 4.5␮A typical shutdown current • Series connection for ultimate LED current matching APPLICATIONS • White LED backlighting for colour LCD panels • General LED backlighting • High performance white LED flashlights • General LED driving from batteries PINOUT SOT23-6 ORDERING INFORMATION DEVICE ZXSC400E6TA REEL TAPE QUANTITY SIZE WIDTH PER REEL 7“ 8mm 3000 units DEVICE MARKING • C400 VCC GND STDN DRIVE VFB SENSE Top View ISSUE 1 - JANUARY 2003 1 1 page APPLICATIONS INFORMATION ZXSC400 Switching transistor selection Capacitor 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. 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 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. 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: 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. Part No. CMD4D11-100MC CMD4D11-220MC LPO2506OB-103 ST2006103 Manufacture Sumida Sumida Coilcraft Standex Electronics Inc L 10␮H 22␮H 10␮H 10␮H IPK (A) 0.5 0.4 1.0 0.6 RDC( ) 0.457 0.676 0.24 0.1 ISSUE 1 - JANUARY 2003 5 5 Page Li - Ion to 3 LED converter ZXSC400 100 3 White LEDs I =20mA 90 LED 80 70 602.5 3.0 3.5 4.0 Input Voltage (V) Input Voltage v Efficiency 30 3 White LEDs 20 10 02.5 3.0 3.5 4.0 Input Voltage (V) Input Voltage v LED Current Bill of Materials Ref Value U1 U2 L1 10␮H R1 68m⍀ R2 15⍀ C1 2.2␮F/6V3 C2 2.2␮F/16V LED Part Number ZXSC400 ZX3CDBS1M832 CMD4D11-100MC LR1206 / RL1220 Generic GRM Series GRM Series NSCW215 ISSUE 1 - JANUARY 2003 Manufacture Zetex Zetex Sumida IRC / Cyntec Generic Murata Murata Nichia Comments LED driver IC NPN + Schottky dual 1mm height profile 1206 / 0805 size 0603 size 0805 size 1206 size White SMT LED 11 11 Page

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