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LTC3218EDDBPBF Datasheet(PDF) 6 Page - Linear Technology |
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LTC3218EDDBPBF Datasheet(HTML) 6 Page - Linear Technology |
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6 / 12 page  LTC3218 6 3218fa BLOCK DIAGRAM The LTC3218 uses a switched capacitor charge pump to power a high current LED with a programmed regulated current. Current regulation is achieved using an internal current sense resistor connected between the CPO and ILED pins. The part starts up in 1x mode after a soft-start period. In this mode, VIN is connected to the CPO through switches, the strengths of which are modulated to achieve the desired LED current. This mode provides maximum efficiency and minimum noise. The LTC3218 will remain in – + CPO ILED GND ISETF VIN ENT CP CM 3218 BD CURRENT SOURCE CONTROL VREF VOLTAGE CLAMP 106 Ω 220m Ω OSCILLATOR MODE CONTROL 1 9 2 3 8 GND 11 6 ISETT 5 4 ENF 7 10 CONTROL LOGIC OPERATION this mode until the LED forward voltage (VF) approaches the maximum CPO voltage possible in this mode. When this dropout condition occurs, the LTC3218 will switch to 2x mode after a soft-start period. The current delivered to the LED load is controlled by the internal programmable current source. The current is programmed by resistors connected between the ISETT and ISETF pins and GND. The resistor values needed to |
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