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RS9360B Datasheet(PDF) 4 Page - Orister Corporation |
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RS9360B Datasheet(HTML) 4 Page - Orister Corporation |
4 / 8 page Page No. : 4/8 DS-RS9360-01 Aug, 2006 www.Orister.com Absolute Maximum Rating Parameter Symbol Value Unit Input Voltage VIN -0.3~6 V Output Voltage VOUT -0.3~6 V Power Dissipation ( QFN-16L 4X4 ) @ 25 oC PD 2.5 W Maximum Junction Temperature TJ 125 oC Lead Temperature T-LEAD 260 oC Operating Temperature Range TOPR -40 to + 85 oC Storage Temperature Range TSTG -40 to + 85 oC HBM ESD ESD 2000 V Caution: The absolute maximum ratings are rated values exceeding which the product could suffer physical damage. These values must therefore not be exceeded under any condition. Operations The RS9360 is a high efficiency charge pump white LED driver. It provides 4 channels low drop-out voltage current source to regulated 4 white LEDs current. For high efficiency, the RS9360 implements x1/x1.5/x2 mode charge pump. An external RSET is used to set the current of white LED. RS9360 has a input current regulation to reduce the input ripple. Soft Start The RS9360 includes a soft start circuit to limit the inrush current at power on and mode switching. Soft start circuit holds the input current level long enough for output capacitor COUT reaching a desired voltage level. When the soft start off, the RS9360 won’ t sink spike current from VIN. Mode Decision The RS9360 uses a smart mode decision method to select the working mode for maximum efficiency. Mode decision circuit senses the output and LED voltage for up/down selection. Dimming Control CTRL0, CTRL1 and CTRL2 are used to control the onoff of White LED. When a external PWM signal is connected to the control pin, brightness of white LED is adjusted by the duty cycle. LED Current Setting The current of white LED connected to RS9360 can be set by RSET. Every current flows through the white LED is 440 times greater than the current of RSET. The white LED can be estimated by following equation: ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ × = SET ISET LED R V I 440 When VISET = 1.1V, and RSET is the resistance connected from ISET to GND. Thermal Shutdown The RS9360 provides a high current capability to drive 4 white LEDs. A thermal shutdown circuit is needed to protect the chip from thermal damage. When the chip reaches the shutdown temperature 150℃, the thermal shutdown circuit turns off the chip to prevent the thermal accumulation in the chip. Overvoltage Protection The RS9360 regulates the output voltage by controlling the input current. When the output voltage reaches the designated level, the RS9360 reduces the input current. And then, the output voltage regulation also serves an over-voltage protection. Short Circuit Protection A current limiting circuit is also included in theRS9360 for short circuit protection. Whenever output source a dangerously high current, the current limiting circuit takes over the output regulation circuit and reduces the output current at an acceptable level. |
Similar Part No. - RS9360B |
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Similar Description - RS9360B |
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