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STLD40D Arkusz danych(PDF) 1 Page - STMicroelectronics |
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STLD40D Arkusz danych(HTML) 1 Page - STMicroelectronics |
1 / 14 page April 2006 Rev. 2 1/14 14 STLD40D White led power supply for large display backlight General Features s Inductor switches boost controller s PFM mode control s High efficiency over wide range of input voltage from 3.0V to 5.5V s Overvoltage protection with automatic restart s Adjustable peak current limit s Enable pin with possibility of PWM dimming control s Low shutdown current <1uA s Small external component s Good load and line regulation s QFN 3mm x 3mm x 1mm 8 leads Application s White Led supply for LCD backlight s Mobile phone s PDA and organizers s Any handsets powered form 3.0V to 5.5V Description STLD40D is a boost converter that operates from 3.0V to 5.5V and can provide an output voltage as high as 37V and can drive up to 10 white LEDs in series. The converter is a PFM (pulse frequency modulation) inductor switches and can work in discontinuous (DCM) mode operation. A minimum OFF time of the embedded boost switch TSW is fixed internally and allows limiting the switching frequency. The output current capability is 20mA with an output voltage of 37V. The regulation is done by sensing the led current through the resistor RLED. The device can be turned ON/OFF through the logic enable signal pin EN. By applying a low frequency PWM signal the LEDs can be dimmed. The maximum peak inductor current can be programmed by connected a resistor RSET to the pin RSET. www.st.com QFN8 (3mm x 3mm) Order code Part number Package Comments STLD40DPMR QFN8L (3mm x 3mm) 4500 parts per reel |
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