CAT4237TD-T3 datasheet(11/14 Pages) CATALYST

Part #	CAT4237TD-T3

Description	High Voltage CMOS Boost White LED Driver

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Manufacturer	CATALYST [Catalyst Semiconductor]

Direct Link	http://www.catalyst-semiconductor.com

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11 / 14 page

CAT4237

11

Doc. No. MD-5013, Rev. B

Characteristics subject to change without notice

BOARD LAYOUT

The CAT4237 is a high-frequency switching regulator.

The traces that carry the high-frequency switching

current have to be carefully layout on the board in

order to minimize EMI, ripple and noise in general.

The thicker lines on Figure 3 show the switching

current path. All these traces have to be short and

wide enough to minimize the parasitic inductance and

resistance. The loop shown on Figure 3 corresponds

to the current path when the CAT4237 internal switch

is closed. On Figure 4 is shown the current loop, when

the CAT4237 switch is open. Both loop areas should

be as small as possible.

Capacitor C1 has to be placed as close as possible to

the VIN pin and GND. The capacitor C2 has to be

connected separately to the top LED anode. A ground

plane under the CAT4237 allows for direct connection

of the capacitors to ground. The resistor R1 must be

connected directly to the GND pin of the CAT4237

and not shared with the switching current loops and

any other components.

closed

open

Figure 3. Closed-switch Current Loop

Figure 4. Open-switch Current Loop

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