LED恒流，6V/20A，最大60V资源-CSDN文库

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LT3763

Rev. C

For more information www.analog.com

PWM Dimming

PWM

10V/DIV

50V/DIV

5A/DIV

5µs/DIV

3763 TA01b

TYPICAL APPLICATION

FEATURES DESCRIPTION

60V High Current

Step-Down LED Driver Controller

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

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.

20A, Pulse Width Modulated, Single LED Driver

APPLICATIONS

Accurately Control Input and Output Current

3000:1 True Color PWM™ Dimming

±1.5% Voltage Regulation Accuracy

±6% Current Regulation Accuracy

6V to 60V Input Voltage Range

Wide Output Range Up to 55V

<2µA Shutdown Current

Control Pin for Thermal Control of Load Current

Input and Output Current Monitor and Limit

Open, Short, and C/10 Fault Detection

PWM Driver Output for LED Applications

Thermally Enhanced 28-Lead FE Package

High Power Architectural Lighting

Automotive Lighting

Aviation and Marine Strobe Lights

Solar-Powered Chargers, Laser Diodes

100µF

10V TO 30V

2.5mΩ

1k 1k

82.5k

EN/UVLO

FBIN

BOOST

REF

CTRL1

CTRL2

LT3763

GND

SENSE

–

INTV

220nF

1.5µH

22µF

2.5mΩ

FAULT

59k

4.7nF

47.5k

3763 TA01

12.1k

2.2µF

470k

PWMOUT

OUT

6V, 20A MAXIMUM

220µF

×2

PWM

SYNC

10nF

45.3k

84.5k

15.4k

33nF

10Ω 10Ω

47.5kΩ

1µF

50k

4.7µF

IVINNIVINP

IVINMON

ISMON

1nF

50Ω

All registered trademarks and trademarks are the property of their respective owners.

Document Feedback

LT3763

Rev. C

For more information www.analog.com

PIN CONFIGURATIONABSOLUTE MAXIMUM RATINGS

, EN/UVLO, IVINP, and IVINN ...............................60V

SENSE

and SENSE

–

.................................................60V

CTRL1, CTRL2, FB, and FBIN ......................................3V

SYNC and PWM .......................................................... 6V

INTV

and FA U LT.......................................................6V

, RT, and SS ............................................................3V

REF

, IVINMON, and ISMON ........................................3V

SW ............................................................................60V

BOOST ......................................................................66V

BOOST-SW ..................................................................6V

Operating Junction Temperature (Notes 2, 3)

LT3763E/LT3763I

.............................. –40°C to 125°C

LT3763H

............................................ –40°C to 150°C

Storage Temperature Range .................. –65°C to 150°C

Lead Temperature (Soldering, 10 sec) ...................300°C

(Note 1)

TOP VIEW

FE PACKAGE

28-LEAD PLASTIC TSSOP

INTV

EN/UVLO

REF

IVINN

IVINP

VINMON

FAULT

FBIN

GND

CTRL2

CTRL1

GND

BOOST

PWM_OUT

GND

PWM

SYNC

ISMON

SENSE

–

GND

= 30°C/W

EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB

ORDER INFORMATION

LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE

LT3763EFE#PBF LT3763EFE#TRPBF LT3763FE 28-Lead Plastic TSSOP –40°C to 125°C

LT3763IFE#PBF LT3763IFE#TRPBF LT3763FE 28-Lead Plastic TSSOP –40°C to 125°C

LT3763HFE#PBF LT3763HFE#TRPBF LT3763FE 28-Lead Plastic TSSOP –40°C to 150°C

Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.

Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.

ELECTRICAL CHARACTERISTICS

The l denotes the specifications which apply over the full operating

junction temperature range, otherwise specifications are at T

= 25°C. V

= 12V, V

EN/UVLO

= 5V unless otherwise noted.

PARAMETER CONDITIONS MIN TYP MAX UNITS

Input Voltage Range 6 60 V

Supply Undervoltage Lockout From Low to High 3.75 4.0 4.25 V

Pin Quiescent Current

Non-Switching Operation

Shutdown Mode

EN/UVLO

= 1.4V, Not Switching

EN/UVLO

= 0V

1.7

0.2

3.5

µA

EN/UVLO Pin Threshold (Falling Edge) 1.47 1.52 1.57 V

EN/UVLO Hysteresis 185 mV

EN/UVLO Pin Current EN/UVLO = 1.4V, V

= 6V 5 µA

SYNC Pin Threshold (Falling Edge) 1.4 1.5 1.6 V

SYNC Pin Hysteresis 675 mV

LT3763

Rev. C

For more information www.analog.com

ELECTRICAL CHARACTERISTICS

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: The LT3763E is guaranteed to meet performance specifications

from 0°C to 125°C junction temperature. Specifications over the –40°C

to 125°C operating junction temperature range are assured by design,

characterization and correlation with statistical process controls. The

LT3763I is guaranteed to meet performance specifications over the

–40°C to 125°C operating junction temperature range. The LT3763H is

guaranteed over the –40°C to 150°C operating junction temperature range.

High junction temperatures degrade operating lifetimes; operating lifetime

is derated for junction temperatures greater than 125°C.

PARAMETER CONDITIONS MIN TYP MAX UNITS

Output Current Monitor

Sense Voltage

SENSE

– V

SENSE

–

)

ISMON

Regulated to 1V, V

SENSE

–

= 10V

ISMON

Regulated to 200mV, V

SENSE

–

= 10V

Input Current Monitor

Sense Voltage

IVIN

– V

IVIN

–

)

IVINMON

Regulated to 1V, V

IVIN

= 12V

IVINMON

Regulated to 200mV, V

IVIN

= 12V

Input Current Limit Sense Voltage

IVIN

– V

IVIN

–

)

45 50 55 mV

PWM Driver

PWM_OUT Driver On-Resistance

Gate Pull-Up

Gate Pull-Down

INTVCC

= 5V

2.2

0.9

WM to PWM_OUT Propagation Delay

Rising

Falling

INTVCC

= 5V

Current Control Loop g

Amp

Offset Voltage V

SENSE

–

= 4V, V

CTRL1

= 0V

–3 0 3 mV

Input Common Mode Range

CM(LOW)

CM(HIGH)

(Note 5)

CM(HIGH)

Measured from V

to V

, V

SENSE

= V

SENSE

–

1.4

Output Impedance 3.5 MΩ

375 475 625 µA/V

Differential Gain 1.7 V/mV

Overvoltage

FB Overvoltage Protection (V

Maximum) 1.515 V

Overcurrent

Overcurrent Protection

SENSE

– V

SENSE

–

Maximum)

SENSE

–

= 0V, R

= 221kΩ 85 mV

The l denotes the specifications which apply over the full operating

junction temperature range, otherwise specifications are at T

= 25°C. V

= 12V, V

EN/UVLO

= 5V unless otherwise noted.

Note 3: This IC includes overtemperature protection that is intended to

protect the device during momentary overload conditions. The maximum

rated junction temperature will be exceeded when this protection is active.

Continuous operation above the specified absolute maximum operating

junction temperature may impair device reliability or permanently damage

the device.

Note 4: The minimum on- and off-times are guaranteed by design and are

not tested.

Note 5: The minimum common mode voltage is guaranteed by design and

is not tested.

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