LT3590 데이터 시트보기 (PDF) - Linear Technology

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LT3590

48V Buck Mode LED Driver in SC70 and 2mm x 2mm DFN

Linear Technology 

LT3590

PIN FUNCTIONS (SC70/DFN)

SW (Pin 1/Pin 3): Switch Pin. Minimize trace area at this

pin to minimize EMI. Connect the inductor at this pin.

GND (Pins 2, 3, 4/Pin 2): Ground Pins. All ground pins

should be tied directly to local ground plane. Proper

soldering of these pins to the PCB ground is required to

achieve the rated thermal performance.

CTRL (Pin 5/Pin 1): Dimming and Shutdown Pin.

Connect it below 100mV to disable the switcher. As the

pin voltage is ramped from 0V to 1.5V, the feedback volt-

age (VIN - VLED) ramps from 0mV to 200mV, controlling

the LBD current.

ILED

=

VIN

− VLED

R1

VREG (Pin 6/Pin 6): Internally Generated 3.3V Regulated

Output Pin. Must be locally bypassed with a 0.1μF X5R

capacitor.

LED (Pin 7/Pin 5): Connection point for the anode of the

highest LED and the sense resistor.

VIN (Pin 8/Pin 4): Input Supply Pin. Must be locally by-

passed.

Exposed Pad (NA/Pin 7): Ground. The Exposed Pad

should be soldered to the PCB ground to achieve the

rated thermal performance.

BLOCK DIAGRAM

VIN

48V

C1

1μF

VREG

C3

0.1μF

CONTROL

6

VIN

R1

6.8Ω

REG

A = 6.25 LED

EAMP

C2

1μF

VREF

1.25V

START-UP

CONTROL

–

PWM

+

∑

RAMP

GENERATOR

850kHz

OSCILLATOR

CTRL

R

Q

S

ISNS

GND

Figure 1. Block Diagram

L1

SW

470μH

VOUT

3590 F01

3590f

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