Datasheet
Table Of Contents
- AN-2083 LM3444 A19 Edison Retrofit Evaluation Board
- 1 Introduction
- 2 Evaluation Board Operating Conditions
- 3 Simplified LM3444 Schematic
- 4 Pin-Out
- 5 LM3444 Evaluation Board Schematic
- 6 Bill of Materials LM3444 Evaluation Board
- 7 Output Current versus Number of LEDs for Various Modifications
- 8 Typical Performance Characteristics
- 9 PCB Layout
- 10 EMI/EMC Information
1
4
3
2
10
7
8
9
I
SNS
NC
GATE
NC
COFF
V
CC
NC
NC
5 6FILTER GND
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Pin-Out
4 Pin-Out
Figure 1. 10-Pin VSSOP
Table 1. Pin Description 10 Pin VSSOP
Pin # Name Description
1 NC No internal connection.
2 NC No internal connection.
3 NC No internal connection.
4 COFF OFF time setting pin. A user set current and capacitor connected from the output to this pin sets the
constant OFF time of the switching controller.
5 FILTER Filter input. A capacitor tied to this pin filters the error amplifier. Could also be used as an analog dimming
input.
6 GND Circuit ground connection.
7 ISNS LED current sense pin. Connect a resistor from main switching MOSFET source, ISNS to GND to set the
maximum LED current.
8 GATE Power MOSFET driver pin. This output provides the gate drive for the power switching MOSFET of the
buck controller.
9 V
CC
Input voltage pin. This pin provides the power for the internal control circuitry and gate driver.
10 NC No internal connection.
3
SNVA455C–August 2010–Revised May 2013 AN-2083 LM3444 A19 Edison Retrofit Evaluation Board
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