LT3465 Ver la hoja de datos (PDF) - Linear Technology

Número de pieza

componentes Descripción

Fabricante

LT3465

White LED Step-Up Converter with Built-In Schottky in ThinSOT

Linear Technology 

LT3465

APPLICATIO S I FOR ATIO

Open-Circuit Protection

The LT3465 has internal open-circuit protection circuit. In

the cases of output open circuit, when the LEDs are

disconnected from the circuit or the LEDs fail, the VOUT is

clamped at 30V. The LT3465 will then switch at a very low

frequency to minimize the input current. VOUT and input

current during output open circuit are shown in the Typical

Performance Characteristics.

Board Layout Consideration

As with all switching regulators, careful attention must be

paid to the PCB board layout and component placement. To

maximize efficiency, switch rise and fall times are made as

short as possible. To prevent electromagnetic interference

(EMI) problems, proper layout of the high frequency switch-

ing path is essential. Place COUT next to the VOUT pin.

Always use a ground plane under the switching regulator

to minimize interplane coupling. In addition, the ground

connection for the feedback resistor R1 should be tied

directly to the GND pin and not shared with any other

component, ensuring a clean, noise-free connection. Rec-

ommended component placement is shown in Figure 7.

COUT

1

2

RFB

3

GND

L

6

5

4

CIN

VIN

3465 F07

CTRL

Figure 7. Recommended Component Placement

8

sn3465 3465is

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