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LM3550 데이터시트(PDF) 2 Page - Texas Instruments |
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LM3550 데이터시트(HTML) 2 Page - Texas Instruments |
2 / 37 page Bottom View Die-Attach Pad (DAP) GND 2 3 4 5 1 14 13 12 11 15 Top View Die-Attach Pad (DAP) GND 2 3 4 5 1 14 13 12 11 15 LM3550 SNVS569B – MAY 2009 – REVISED MAY 2013 www.ti.com DESCRIPTION (CONTINUED) The LM3550 can be configured to utilize a proprietary super-capacitor charging scheme (Optimal Charge Mode), allowing faster charging times (0 to Target Voltage) and lower current-source power dissipation. Optimal Charge Mode adapts to changes in the flash LEDs forward voltage as well as the super-capacitor's ESR ensuring that the super-capacitor is charged to the ideal voltage required to sustain constant current-flash operation. The LED current and Flash pulse duration of the LM3550 can be programmed via an I2C-compatible interface. The STROBE pin allows the Flash to be toggled via a flash-enable signal from a camera module. The EOC pin sinks current when the output voltage reaches 95% of the final value. The ALD/TEMP input pin allows either a light sensor to adjust the flash-current level based on the ambient light conditions, or it allows for over-temperature detection and protection of the LED during high-power operation or high ambient-temperature conditions by connecting an NTC thermistor temperature monitoring circuit to the pin. Connection Diagram PIN DESCRIPTIONS Pin # Name Description 14 VIN Input voltage connection. A 1 µF ceramic capacitor is required from VIN to GND. Charge pump output. A 1 µF ceramic capacitor is required from VOUT to GND. Connect the Flash LED 1 VOUT anodes and Super-Capacitor to this pin. 20 C1+ 18 C1- Flying capacitor pins. 1 µF ceramic capacitor should be connected from C1+ to C1 − and C2+ to C2−. 15 C2+ 16 C2- 3 LED- Regulated current sink input, for Torch Mode. 4 FET_CON External FET controller. Connect gate of flash NFET to this pin. 5 FB Programmable Feedback Voltage pin. 10 SCL I2C Serial Clock pin. 8 SDA I2C Serial Data I/O pin. 13 IND Indicator LED Current Source. Drives one red LED with a 5 mA current. End-of-charge output/ flash ready. The EOC pin will transition from high to low when an end of charge 6 EOC state has been reached Manual Flash enable pin. The Strobe pin can be configured to be rising edge sensitive with the flash 11 STROBE timing controlled internally, or level sensitive with the flash timing being controlled externally. 2 BAL Super-capacitor active Balance pin. Ambient Light Sensor or Temperature Monitoring pin. For ambient light sensing, connect a light sensor / 12 ALD/TEMP photo-diode and a resistor to this pin. For temperature monitoring, connect a NTC thermistor from VCC to the NTC pin and a resistor from the NTC pin to ground. 7,9,17,19, DAP GND Ground pins. These pins should be connected directly to a low impedance ground plane. These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. 2 Submit Documentation Feedback Copyright © 2009–2013, Texas Instruments Incorporated Product Folder Links: LM3550 |
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