ZLED7520 datasheet(22/28 Pages) ETC2

22 / 28 page

ZLED7020

High Current 40V LED Driver with Internal Switch

Data Sheet

August 12, 2011

the prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.

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• Do not lay out high-voltage traces near the ADJ pin because if the board is contaminated, leakage current

can affect the ADJ pin voltage and cause unintended output current. To further reduce this risk, use a

ground ring around the ADJ pin. (Also see section 2.7 regarding the ZLED7x20’s protection circuitry for

preventing excessive output current.)

• To minimize ground bounce, locate the 0.1µF external capacitor C2 as close as possible to the V

IN pin and

solder the ZLED7x20’s GND pin directly to the ground plane. (Also, see section 3.3.4 regarding ground

bounce.)

• Because Rs is typically a low value resistor, it is important to consider the resistance of the traces in series

with RS as part of the total current sense resistance. Use traces that are as short and wide as possible to

minimize this effect.

• The ZLED7x20’s thermal pad must be grounded.

ESD Protection

All pins have an ESD protection of

≥ ±3500V according to the Human Body Model (HBM). The ESD test follows

the Human Body Model with 1.5 k /100 pF based on MIL 883-H, Method 3015.8.

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