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LC5223D Datenblatt(PDF) 1 Page - Sanken electric |
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LC5223D Datenblatt(HTML) 1 Page - Sanken electric |
1 / 10 page LC5223D and LC5226D Description LC5220 series is a non-isolating, simple and efficient LED driver. The high voltage capability allows direct connection to a wide range of supply voltages ranging from 25 to 400 V (recommended). The LC5220 uses constant current mode to drive LEDs. and buck and buck-boost voltage converters can be configured. A power MOSFET and controller IC are incorporated in one package. Because few external parts are required, the LC5220 is ideal for use in small-size LED light bulbs. Various control requirements can be supported through the REF pin, including peak current control, output on/off, and sleep mode enable. Moreover, there is a protection circuit for freewheeling diode open, protection for a buck-boost voltage converter open LED load, and a variable overcurrent protection func- tion. These features improve safety for both the LC5220 and the LEDs. Off-Line DC/DC LED Driver ICs Typical Application Applications • LED lighting fixtures • LED light bulbs Packages Not to scale DIP8 An example of a buck voltage converter application circuit Features and Benefits • Buck and buck-boost topology; selectable by peripheral circuit structure • Built-in fixed reference voltage limiting constant current control; high precision regulator improves current precision and simplifies setting of current level • Sleep function, with latch mode; input high, 3 V or more, on REF pin turns off IC output to LEDs • Enable function; input low on REF pin toggles IC output to LEDs • High input voltage; up to 250 V or 450 V, depending on product • Output Current: 1.0 A • Built-in constant current control; PWM method, output current adjustable by the voltage input on the REF pin • External adjustable PWM dimming control • Protection features: ▫ Open protection (OPP) with latched shutdown; protects IC when a free-wheeling diode is open ▫ Undervoltage lockout (UVLO) ▫ Overcurrent protection (OCP) with latched shutdown; variable OCP threshold linked to REF pin voltage ▫ Thermal shutdown (TSD) with auto restart LC5220 VBB OUT SEN GND REG PWM REF R1 R2 CPWM RS D1 L1 C2 C1 CIN AC Input VIN C3 Line Filter VLED LC5223D/26D-DS SANKEN ELECTRIC CO., LTD. August 8, 2012 |
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