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PDF LT3763 Data sheet ( Hoja de datos )
| Número de pieza | LT3763 | |
| Descripción | 60V High Current Step-Down LED Driver Controller | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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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
VIN
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
VREF
LT3763
CTRL2
VIN
TG
BOOST
SW
50k
50Ω
50Ω
470k
INTVCC
CTRL1
FBIN
IVINMON
ISMON
PWM
SYNC
RT
BG
GND
SENSE+
SENSE–
PWMOUT
FAULT
FB
SS VC
47.5kΩ
82.5k 10nF
59k
4.7nF
220nF
22µF
33nF
1.5µH 2.5mΩ
VOUT
6V, 20A MAXIMUM
220µF
×2
10Ω 10Ω
47.5k
12.1k
3763 TA01
PWM
10V/DIV
VSW
50V/DIV
IL
5A/DIV
For more information www.linear.com/LT3763
PWM Dimming
5µs/DIV
3763 TA01b
3763fb
1
1 page  
Typical Performance Characteristics
LT3763
EN/UVLO Threshold (Falling)
1.70
1.64
1.58
1.52
1.46
1.40
6
24 42
VIN (V)
60
3763 G01
EN/UVLO Current
6.0
5.5
5.0
4.5
4.0
6
24 42
VIN (V)
60
3763 G02
Quiescent Current (Shutdown)
10000
1000
6VIN
12VIN
60VIN
100
10
1
0.1
0.01
0.001
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3763 G03
Quiescent Current (Non-Switching)
3.0
2.5
2.0
1.5
6
TA = 150°C
TA = 25°C
TA = –50°C
24 42 60
VIN (V)
3763 G04
VREF Voltage
2.03
6VIN
12VIN
60VIN
2.02
2.01
2.00
1.99
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3763 G05
VREF Current Limit
1.5
1.4
1.3
1.2
1.1
1.0
0.9
6
TA = 150°C
TA = 25°C
TA = –50°C
24
VIN (V)
42
60
3763 G06
RT Current Limit
70
64
58
52
46
40
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3763 G07
SS Current
16
14
12
10
8
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3763 G08
For more information www.linear.com/LT3763
INTVCC Current Limit
6
5
4
3
2
1
0
0 10 20 30 40 50 60
IINTVCC (mA)
3763 G09
3763fb
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5 Page 
LT3763
Pin Functions
GND (Pin 12, Pin 23, Pin 28, Exposed Pad Pin 29):
Ground. The exposed pad must be soldered to the PCB.
CTRL2 (Pin 13): Thermal Control Input to Reduce the
Regulated Output Current.
CTRL1 (Pin 14): The CTRL1 pin sets the regulated output
current. The maximum control voltage is 1.5V. Above 1.5V,
there is no change in the regulated current.
SS (Pin 15): The Soft-Start Pin. Place an external capacitor
to ground to limit the regulated current during start-up
conditions. The soft-start pin has an 11µA charging cur-
rent. When the voltage at this pin is lower than voltages at
CTRL1 and CTRL2, it overrides both signals and determines
the regulated current.
SENSE– (Pin 16): SENSE– is the noninverting input of the
error amplifier for the current regulation loop. The reference
current, based on CTRL1, CTRL2, SS or FBIN determines
the regulated voltage between SENSE+ and SENSE–.
SENSE+ (Pin 17): SENSE+ is the inverting input of the
error amplifier for the current regulation loop. This pin
is connected to an external current sense resistor. The
voltage drop between SENSE+ and SENSE– is measured
against the voltage drop across an internal resistor at the
input to the current regulation loop.
VC (Pin 18): A resistor and capacitor connected in series
to the VC pin provide the necessary compensation for the
stability of the average current loop. Typical values are 5k
to 60k for the resistor and 2.2nF to 10nF for the capacitor.
ISMON (Pin 19): ISMON is the buffered output of the
output current sense amplifier. This voltage output enables
monitoring the averaged output current of the LED driver
with a voltage of 20 • (VSENSE+ – VSENSE–). The capacitive
loading to this pin should be less than 1nF.
RT (Pin 20): A resistor from the RT pin to ground sets the
switching frequency between 200kHz and 1MHz. When
using the SYNC function, set the frequency to be at least
20% lower than the SYNC pulse frequency. This pin is
current-limited to 55µA. Do not leave this pin open.
SYNC (Pin 21): Frequency Synchronization Pin. This pin
allows the switching frequency to be synchronized to an
external clock. The RT resistor should be chosen to oper-
ate the internal clock at 20% slower than the SYNC pulse
frequency. This pin should be grounded when not in use.
PWM (Pin 22): The input pin for PWM dimming of LEDs.
When low, all switching is terminated and the PWM_OUT
pin is low. This pin should be connected to INTVCC when
not in use.
PWM_OUT (Pin 24): This pin can drive an external FET
for PWM dimming of LEDs. The pull-up and pull-down
impedances of the driver are 2.2Ω and 0.9Ω, respectively.
Do not force any voltage on this pin.
TG (Pin 25): TG is the top FET gate drive pin that controls
the state of the external high side power FET. The driver
pull-up impedance is 2.2Ω, and pull-down impedance is
1.3Ω. Do not force any voltage on this pin.
SW (Pin 26): The SW pin is used internally as the lower
rail for the floating top FET gate driver. Externally, this node
connects the two power FETs and the inductor.
BOOST (Pin 27): The BOOST pin provides a floating 5V
regulated supply for the top FET gate driver. An external
schottky diode is required from the INTVCC pin to the
BOOST pin to charge the BOOST capacitor when the SW
pin is near ground.
For more information www.linear.com/LT3763
3763fb
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| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LT3763.PDF ] | |
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