IS31LT3354-STLS2 datasheet(10/12 Pages) ISSI

Part #	IS31LT3354-STLS2

Description	40V LED DRIVER WITH EXTERNAL SWITCH

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Manufacturer	ISSI [Integrated Silicon Solution, Inc]

Direct Link	http://www.issi.com

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10 / 12 page

IS31LT3354

Integrated Silicon Solution, Inc. – www.issi.com

Rev. A, 09/01/2011

10

Layout considerations

External MOSFET Drain

The Drain of the external MOSFET is a fast switching

node, so PCB traces should be kept as short as

possible. To minimize ground 'bounce', the ground pin

of the chip should be soldered directly to the ground

plane.

Coil and decoupling capacitors

It is particularly important to mount the coil and the

input decoupling capacitor close to the chip to

minimize parasitic resistance and inductance, which

will degrade efficiency. It is also important to take

account of any trace resistance in series with current

sense resistor RS.

ADJ pin

The ADJ pin is a high impedance input, so when left

floating, PCB traces to this pin should be as short as

possible to reduce noise pickup. ADJ pin can also be

connected to a voltage between 1.2V~5V. In this case,

the internal circuit will clamp the output current at the

value which is set by ADJ=1.2V.

High voltage traces

Avoid running any high voltage traces close to the ADJ

pin, to reduce the risk of leakage due to board

contamination. Any such leakage may raise the ADJ

pin voltage and cause excessive output current. A

ground ring placed around the ADJ pin will minimize

changes in output current under these conditions.

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