LT3003 Просмотр технического описания (PDF) - Linear Technology

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LT3003

3-Channel LED Ballaster with PWM

Linear Technology 

PIN FUNCTIONS

VEE (Pin 10): Lower Rail.

• Boost: Connect to System Ground

• Buck Mode: Connect to Inductor

• Buck-Boost Mode: Connect to Input Supply

LT3003

Exposed Pad (Pin 11): GND. The ground for the IC should

be soldered to a continuous copper ground plane under

the LT3003 die. Soldering the Exposed Pad to the copper

ground plane under the device will reduce thermal resis-

tance and increase the power capability of the LT3003.

BLOCK DIAGRAM

1

LED1

4

VMAX

B1

2

LED2

VIN

B2

3

LED3

+

B3

–

PWM

6

+

0.5V

–

B1 B2 B3

PWM

LOGIC

VEE

BIAS

BG

EXPOSED PAD

11

Figure 1. Block Diagram

3V

0.7V

THERMAL

SHUTDOWN

BG 125°C

150°C

VEE

10

VIN

5

SHDN

9

OT1

7

OT2

8

3003 F01

3003fa

5

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