LT3763_15 Datasheet, PDF (1/30 Pages) Linear Technology – 60V High Current Step-Down LED Driver Controller

LT3763
60V High Current
Step-Down LED Driver Controller
Features
Description
n _{Accurately Control Input and Output Current}
n _{3000:1 True Color PWM™ Dimming}
n _{±1.5% Voltage Regulation Accuracy}
n _{±6% Current Regulation Accuracy}
n _{6V to 60V Input Voltage Range}
n _{Wide Output Range Up to 55V}
n _{<2µA Shutdown Current}
n _{Control Pin for Thermal Control of Load Current}
n _{Input and Output Current Monitor and Limit}
n _{Open, Short, and C/10 Fault Detection}
n _{PWM Driver Output for LED Applications}
n _{Thermally Enhanced 28-Lead FE Package}
Applications
n _{High Power Architectural Lighting}
n _{Automotive Lighting}
n _{Aviation and Marine Strobe Lights}
n _{Solar-Powered Chargers, Laser Diodes}
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and True
Color PWM is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners. Protected by U.S. Patents including 7199560, 7321203 and
others pending.
The LT^®3763 is a fixed frequency, synchronous, step-down
DC/DC controller designed to accurately regulate output
currents up to 20A. The average current mode control-
ler will maintain inductor current regulation over a wide
output voltage range from 0V to 55V. Output current is
set by analog voltages on the CTRL pins and an external
sense resistor. Voltage regulation and overvoltage protec-
tion are set with a voltage divider from the output to the
FB pin. The switching frequency is programmable from
200kHz to 1MHz through an external resistor on the RT
pin or with the SYNC pin and an external clock signal.
Input and output current sensing provides input current
limiting and an accurate measurement of these currents.
The FBIN pin is provided for applications requiring a peak
power tracking function.
Additional features include an accurate external reference
voltage for use with the CTRL pins, an accurate UVLO/
EN pin that allows for programmable UVLO hysteresis,
a PWM driver for LED applications, output voltage fault
detection, and thermal shutdown.
Typical Application
V_IN
10V TO 30V
20A, Pulse Width Modulated, Single LED Driver
2.5mΩ
84.5k
1k ^1µF 1k
4.7µF
100µF
2.2µF
1nF
1nF
15.4k
45.3k
IVINP IVINN
EN/UVLO
V_REF
LT3763
CTRL2
V_IN
TG
BOOST
SW
50k
50Ω
50Ω
470k
INTV_CC
CTRL1
FBIN
IVINMON
ISMON
PWM
SYNC
RT
BG
GND
SENSE⁺
SENSE^–
PWMOUT
FAULT
FB
SS V_C
47.5kΩ
82.5k 10nF
59k
4.7nF
220nF
22µF
33nF
1.5µH 2.5mΩ
V_OUT
6V, 20A MAXIMUM
220µF
×2
10Ω 10Ω
47.5k
12.1k
3763 TA01
PWM
10V/DIV
V_SW
50V/DIV
I_L
5A/DIV
For more information www.linear.com/LT3763
PWM Dimming
5µs/DIV
3763 TA01b
3763fa
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