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LT3595 Datasheet(PDF) 1 Page - Linear Technology |
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LT3595 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 16 page  LT3595 1 3595f , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. True Color PWM is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION 16 Channel Buck Mode LED Driver The LT®3595 is a high performance LED Driver designed to drive sixteen independent channels of up to 10 LEDs at currents up to 50mA. Series connection of the LEDs provides identical LED currents resulting in uniform bright- ness. Power switches, Schottky diodes, and compensation components are all internal, providing a small converter footprint and lower component cost. The high 2MHz switching frequency permits the use of tiny, low profile inductors and capacitors. A fixed frequency, current mode architecture results in stable operation over a wide range of supply and output voltage. A single external resistor sets the LED current for all sixteen channels, and dimming is then controlled for each channel by pulse width modulating the individual PWM pins. Rela- tive current matching among the sixteen drivers is 8% and the PWM dimming range is 5000:1. The part is available in a 5mm × 9mm × 0.75mm 56-pin QFN package. 16-Channel LED Driver (Three LEDs per Channel), 20mA Current ■ 4.5V to 45V Input Supply Range ■ Up to 50mA LED Current per Channel ■ 100mA, 45V Internal Switches ■ 8% Relative LED Current Match at 20mA ■ 16 Independent LED Channels ■ 5000:1 True Color PWMTM Dimming Range ■ LEDs Disconnected in Shutdown ■ Internal Schottky Diodes ■ Low Quiescent Current ■ 2MHz Switching Frequency ■ RSET Pin Sets Master LED Current ■ Typical Efficiency: 92% ■ Open LED Detection and Thermal Protection ■ 56-Pin 5mm × 9mm × 0.75mm QFN Package ■ LED Video Billboards ■ LCD Televisions ■ Stadium and Advertising Displays 5000:1 PWM Dimming at 100Hz VIN 15V TO 45V LED BRIGHTNESS CONTROL VCC 3V TO 5.5V VCC 0.47 μF 0.47 μF 0.47 μF 0.47 μF 0.47 μF 0.47 μF 0.47 μF 0.47 μF 0.47 μF 10 μF 10 μF 100k 0.47 μF 0.47 μF 0.47 μF 0.47 μF 0.47 μF 0.47 μF 0.47 μF 3595 TA01 OPENLED PWM1 PWM2 PWM3 PWM4 PWM5 PWM6 PWM7 PWM8 VCC PWM9 PWM10 PWM11 PWM12 PWM13 PWM14 PWM15 PWM16 GND RSET L1 SW1 SW2 L4 SW3 SW7 L3 SW4 L5 L6 SW5 SW6 L2 L7 SW8 L8 L16 SW16 SW15 VIN L13 SW14 VIN SW10 L14 SW13 L12 L11 SW12 SW11 L15 L10 SW9 L9 SHDN LT3595 LED BRIGHT- NESS CONTROL 400ns/DIV ILED 10mA/DIV ISW 20mA/DIV VPWM 5V/DIV 3595 TA01b VIN = 15V 3 LEDS AT 20mA T = 10ms TON = 2μs |
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