ISSI IS31LT3360 Quick Start Manual

IS31LT3360 AIC LED Driver Evaluation Board Guide
Description
The IS31LT3360 is a continuous mode inductive
step-down converter, designed for driving a single LED
or multiple series connected LEDs efficiently from a
voltage source higher than the LED voltage. The chip
operates from an input supply between 6V and 40V and
provides an externally adjustable output current of up to
1.2A. The IS31LT3360 includes an integrated output
switch and a high-side output current sensing circuit,
which uses an external resistor to set the nominal
average output current. Output current can be adjusted
linearly by applying an external control signal to the
ADJ pin. The ADJ pin will accept either a DC voltage or
a PWM waveform. This will provide either a continuous
or a gated output current. Applying a voltage of 0.2V or
lower to the ADJ pin turns the output off and switches
the chip into a low current standby state. The chip is
assembled in SOT89-5 package. IS31LT3360 AIC
DEMO board is used in RGB lamp or the general LED
lamp.
Features

Internal 40V power switch

6V to 40V V
IN

Open-circuit protection

Thermal shutdown protection

I =1.2A (max output current)
OUTPUT

98% efficiency (max)

1200:1 dimming rate (typical)

3% I accuracy (typical)
OUTPUT

PWM and DC line control mechanism
• Single pin On/Off
• Brightness control

1MHz switching frequency (max)

SOT89-5 package

Low part count and system resource overhead

Ordering Information

Part No
IS31LT3360-SDLS3-EBAIC
For information about ordering, delivery, and pricing, please contact ISSI at
analog_mkt@issi.com
Integrated Silicon Solution, Inc. – www.issi.com
R1.1, 3/22/2011
Temperature Range
-40 to +85C (Industrial)
Table 1: IS31LT3360 AIC Ordering Information
or (408)969-6600.
Quick Start
Figure 1: IS31LT3360 AIC Evaluation Board Photo
Recommended Equipment

60VDC power supply

3 x LED panel (1W LED, 10 LEDs in series on
each panel)

Multi-meter
Recommended I/O Ratings

Input: 6-40VDC

Output: 1-10 LEDs in series (333mA)
Note: The input voltage must be 5V higher than the output
voltage (∑V ).
F
Absolute Maximum Ratings

Input voltage ≤ 40VDC
Caution: Do not exceed the conditions listed above, otherwise
the board will be damaged.
IC Package
SOT89-5
1