Diodes ZXSC310 Manual de usuario

DEVICE DESCRIPTIONThe ZXSC310 is a single or multi cell LED driverdesigned for LCD backlighting applications. The inputvoltage range of the device is

Peak current definitionThe peak current rating is a design parameter whosevalue is dependent upon the overall application. Forthe high brightness refe

Output Power CalculationBy making the above assumptions for inductance andpeak current the output power can be determined by:Note:VOUT=output voltage

Shutdown ControlThe ZXSC310 offers a shutdown mode that produces astandby current of less than 5uA when in operation.When the voltage at the STDNpin i

ZXSC310ISSUE 3 - SEPTEMBER 200713SEMICONDUCTORSSTDNVCCGndISENSEVDRIVE12345Top ViewPINOUT DIAGRAMPin No. Name Description1VCCSupply voltage, generally

(NOTES)SEMICONDUCTORSZXSC310ISSUE 3 - SEPTEMBER 200714

ZXSC310ISSUE 3 - SEPTEMBER 200715SEMICONDUCTORSDefinitionsProduct changeZetex Semiconductors reserves the right to alter, without notice, specificatio

SEMICONDUCTORSZXSC310ISSUE 3 - SEPTEMBER 200716SCZXSC310DS1EuropeZetex GmbHKustermannparkBalanstraße 59D-81541 MünchenGermanyTelefon: (49) 89 45 49 49

ABSOLUTE MAXIMUM RATINGS:Supply Voltage -0.3 to 10VMaximum Voltage other pins -0.3 to VCC+0.3VPower Dissipation 450mWOperating Temperature -40 to 85 °

FMMT618For the circuits described in the applications sectionZetex FMMT618 is the recommended pass transistor.ZHCS1000For the maximum brightness circu

SEMICONDUCTORSZXSC310ISSUE 3 - SEPTEMBER 20074TYPICAL CHARACTERISTICS

DEVICE DESCRIPTIONThe ZXSC310 is PFM, controller IC which, whencombined with a high performance external transistor,enables the production of a high e

REFERENCE DESIGNSThree typical LED driving applications are shown.Firstly a typical LCD backlight circuit, then maximumbrightness LED driving solution

ZXSC310ISSUE 3 - SEPTEMBER 20077SEMICONDUCTORSThis circuit provides a continuous current output to theLED by rectifying and buffering the DC-DC output

To ensure optimum efficiency, and thereforemaximum battery life, the LED is supplied with a pulsedcurrent. Maximum efficiency is ensured with theremov

APPLICATIONS INFORMATIONThe following section is a design guide for optimumconverter performance.Switching transistor selectionThe choice of switching