PDF SN3350 Data sheet ( Hoja de datos )

Número de pieza	SN3350
Descripción	40V LED driver
Fabricantes	SI-EN Technology
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No Preview Available ! SN3350 40V LED driver with internal switch General Description The SN3350 is a continuous mode inductive step-down converter, designed for driving a single LED or multiple series connected LEDs efficiently from a voltage source higher than the LED voltage. The chip operates from an input supply between 6V and 40V and provides an externally adjustable output current of up to 750mA. Depending upon supply voltage and external components, this can provide up to 30 watts of output power. The SN3350 includes an integrated output switch and a high-side output current sensing circuit, which uses an external resistor to set the nominal average output current. Output current can be adjusted linearly by applying an external control signal to the ADJ pin. The ADJ pin will accept either a DC voltage or a PWM waveform. This will provide either a continuous or a gated output current. Applying a voltage of 0.2V or lower to the ADJ pin turns the output off and switches the chip into a low current standby state. The chip is assembled in SOT23-5 and SOT89-5 package. SOT23-5 is available for 350mA output current application; SOT89-5 is available for 700mA output current application. Application Circuit Features z Simple low parts count z Internal 40V power switch z Wide input voltage range: 6V to 40V z Up to 750mA output current（SOT89-5 package） z High efficiency (up to 95% ) z Typical 1200：1 dimming rate z Typical 5% output current accuracy z Single pin on/off and brightness control using DC voltage or PWM z Up to 1MHz switching frequency z Inherent open-circuit LED protection z Thermal shutdown protection circuitry z Two packages available for different current Applications z Low voltage halogen replacement LEDs z Automotive lighting z Low voltage industrial lighting z LED back-up lighting z Illuminated sign March 2009 Ver1.0 1 SI-EN Technology 1 page SN3350 Electrical characteristics (test conditions: VIN=12V, Tamb=25°C unless otherwise stated) () (continued) Symbol ILX(leak) RLX Parameter LX switch leakage current LX Switch ‘On’ resistance Conditions Min. Typ. 0.9 Max. 1 1.5 Unit μA Ω DPWM(LF) Brightness control range at low frequency PWM signal PWM frequency =100Hz PWM amplitude=5V,Vin=15V, L=27uH, Driving 1 LED 1200:1 DPWM(HF) Brightness control range at low frequency PWM signal PWM frequency =10KHz PWM amplitude=5V,Vin=15V, L=27uH, Driving 1 LED 13:1 fLX Operating frequency ADJ pin floating L=100μH (0.82Ω) IOUT=350mA @ VLED=3.4V Driving 1 LED 154 KHz TONmin Minimum switch ‘ON’ time LX switch ‘ON’ 200 ns TOFFmin fLXmax DLX TPD Minimum switch ‘OFF’ time Recommended maximum operating frequency Recommended duty cycle range of output switch at fLXmax Internal comparator propagation delay LX switch ‘OFF’ 200 ns 1 MHz 0.3 0.7 0.9 50 ns TSD Thermal shutdown temperature 140 °C TSD-HYS Thermal shutdown hysteresis 20 °C NOTES: () Production testing of the chip is performed at 25°C. Functional operation of the chip and parameters specified are guaranteed by design, characterization and process control in other temperature March 2009 Ver1.0 5 SI-EN Technology 5 Page Package Information SOT23-5 SN3350 March 2009 Ver1.0 11 SI-EN Technology 11 Page

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