Datasheet LT3595A (Analog Devices)
| Manufacturer | Analog Devices |
| Description | 16 Channel Buck Mode LED Driver |
| Pages / Page | 16 / 1 — FEATURES. DESCRIPTION. 4.5V to 45V Input Supply Range. Up to 50mA LED … |
| File Format / Size | PDF / 392 Kb |
| Document Language | English |
FEATURES. DESCRIPTION. 4.5V to 45V Input Supply Range. Up to 50mA LED Current per Channel. 100mA, 45V Internal Switches
Model Line for this Datasheet
Text Version of Document
LT3595A 16 Channel Buck Mode LED Driver
FEATURES DESCRIPTION
n
4.5V to 45V Input Supply Range
The LT®3595A is a high performance LED Driver designed n
Up to 50mA LED Current per Channel
to drive sixteen independent channels of up to 10 LEDs n
100mA, 45V Internal Switches
at currents up to 50mA. Series connection of the LEDs n
Improvements vs LT3595
provides identical LED currents resulting in uniform bright- Pinout Allows 1-Sided PCB Layout ness. Power switches, Schottky diodes, and compensation Higher Maximum Switch Duty Cycle components are all internal, providing a small converter LED Current Accuracy (7% vs 8%) footprint and lower component cost. The high 2MHz ±4% LED Current Matching switching frequency permits the use of tiny, low profi le n 16 Independent LED Channels inductors and capacitors. A fi xed frequency, current mode n 5000:1 True Color PWMTM Dimming Range architecture results in stable operation over a wide range n LEDs Disconnected in Shutdown of supply and output voltage. n Internal Schottky Diodes A single external resistor sets the LED current for all sixteen n 2MHz Switching Frequency channels, and dimming is then controlled for each chan- n RSET Pin Sets Master LED Current nel by pulse width modulating the individual PWM pins. n Typical Effi ciency: 92% LED current accuracy is 7%, channel-to-channel current n Open LED Detection and Thermal Protection matching is ±4% and the PWM dimming range is 5000:1. n 56-Pin 5mm × 9mm × 0.75mm QFN Package The part is available in a 5mm × 9mm × 0.75mm 56-pin QFN package.
APPLICATIONS
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. True Color n PWM is a trademark of Linear Technology Corporation. All other trademarks are the property LED Video Billboards of their respective owners. n LCD Televisions n Stadium and Advertising Displays
TYPICAL APPLICATION 16-Channel LED Driver (Three LEDs per Channel), 20mA Current 5000:1 PWM
VIN 15V TO
Dimming at 100Hz
45V 0.47μF 0.47μF 0.47μF 0.47μF 0.47μF 0.47μF 0.47μF 0.47μF 10μF VPWM H H H H H H H H 5V/DIV μ μ μ μ μ μ μ μ VCC 100 100 100 100 100 100 100 100 I 100k SW L1 SW1 L2 SW2 SW3 L3 SW4 L4 L5 SW5 L6 SW6 SW7 L7 SW8 L8 20mA/DIV OPENLED PWM1 PWM9 PWM2 PWM10 PWM3 PWM11 ILED LED LED PWM4 PWM12 10mA/DIV BRIGHTNESS BRIGHT- PWM5 LT3595A PWM13 CONTROL NESS 3595A TA01b PWM6 PWM14 CONTROL 400ns/DIV PWM7 PWM15 PWM8 PWM16 VIN = 15V T = 10ms 3 LEDS AT 20mA t V ON = 2μs CC SHDN GND 3V TO VCC RSET 5.5V L16 SW16 L15 SW15 VIN SW14 L14 SW13 L13 L12 SW12 L11 SW11 VIN SW10 L10 SW9 L9 10μF 75.0k H H H H H H H H μ μ μ μ μ μ μ μ 100 100 100 100 100 100 100 100 0.47μF 0.47μF 0.47μF 0.47μF 0.47μF 0.47μF 0.47μF 0.47μF 3595A TA01 3595af 1
FEATURES DESCRIPTION
n
4.5V to 45V Input Supply Range
The LT®3595A is a high performance LED Driver designed n
Up to 50mA LED Current per Channel
to drive sixteen independent channels of up to 10 LEDs n
100mA, 45V Internal Switches
at currents up to 50mA. Series connection of the LEDs n
Improvements vs LT3595
provides identical LED currents resulting in uniform bright- Pinout Allows 1-Sided PCB Layout ness. Power switches, Schottky diodes, and compensation Higher Maximum Switch Duty Cycle components are all internal, providing a small converter LED Current Accuracy (7% vs 8%) footprint and lower component cost. The high 2MHz ±4% LED Current Matching switching frequency permits the use of tiny, low profi le n 16 Independent LED Channels inductors and capacitors. A fi xed frequency, current mode n 5000:1 True Color PWMTM Dimming Range architecture results in stable operation over a wide range n LEDs Disconnected in Shutdown of supply and output voltage. n Internal Schottky Diodes A single external resistor sets the LED current for all sixteen n 2MHz Switching Frequency channels, and dimming is then controlled for each chan- n RSET Pin Sets Master LED Current nel by pulse width modulating the individual PWM pins. n Typical Effi ciency: 92% LED current accuracy is 7%, channel-to-channel current n Open LED Detection and Thermal Protection matching is ±4% and the PWM dimming range is 5000:1. n 56-Pin 5mm × 9mm × 0.75mm QFN Package The part is available in a 5mm × 9mm × 0.75mm 56-pin QFN package.
APPLICATIONS
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. True Color n PWM is a trademark of Linear Technology Corporation. All other trademarks are the property LED Video Billboards of their respective owners. n LCD Televisions n Stadium and Advertising Displays
TYPICAL APPLICATION 16-Channel LED Driver (Three LEDs per Channel), 20mA Current 5000:1 PWM
VIN 15V TO
Dimming at 100Hz
45V 0.47μF 0.47μF 0.47μF 0.47μF 0.47μF 0.47μF 0.47μF 0.47μF 10μF VPWM H H H H H H H H 5V/DIV μ μ μ μ μ μ μ μ VCC 100 100 100 100 100 100 100 100 I 100k SW L1 SW1 L2 SW2 SW3 L3 SW4 L4 L5 SW5 L6 SW6 SW7 L7 SW8 L8 20mA/DIV OPENLED PWM1 PWM9 PWM2 PWM10 PWM3 PWM11 ILED LED LED PWM4 PWM12 10mA/DIV BRIGHTNESS BRIGHT- PWM5 LT3595A PWM13 CONTROL NESS 3595A TA01b PWM6 PWM14 CONTROL 400ns/DIV PWM7 PWM15 PWM8 PWM16 VIN = 15V T = 10ms 3 LEDS AT 20mA t V ON = 2μs CC SHDN GND 3V TO VCC RSET 5.5V L16 SW16 L15 SW15 VIN SW14 L14 SW13 L13 L12 SW12 L11 SW11 VIN SW10 L10 SW9 L9 10μF 75.0k H H H H H H H H μ μ μ μ μ μ μ μ 100 100 100 100 100 100 100 100 0.47μF 0.47μF 0.47μF 0.47μF 0.47μF 0.47μF 0.47μF 0.47μF 3595A TA01 3595af 1
