MIC2124YMM datasheet(18/24 Pages) MICREL

部品番号	MIC2124YMM

部品情報	Constant Frequency, Synchronous Current Mode Buck Controller

PDF	24 Pages

Scroll/Zoom	100%

メーカー	MICREL [Micrel Semiconductor]

ホームページ	http://www.micrel.com

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18 / 24 page

Micrel, Inc.

MIC2124

June 2010

M9999-060810-D

Others

•

In order to accurately sense the voltage across the

low-side MOSFET, the LX pin and PGND pin should

be Kelvin connected to the drain and source of the

low-side MOSFET.

•

The feedback resistors RFB1 and RFB2 (refer to the

typical application schematic on page 1) should be

placed close to the FB pin. The top side of RFB1

should connect directly to the output node. Run this

trace away from the switch node (junction of Q1, Q2,

and the output inductor).

•

The compensation resistor and capacitors should be

placed right next to the COMP pin and the other side

should connect directly to the GND pin on the

MIC2124 rather than going to the plane.

•

HSD pin is sensitive to the noise. Too much noise at

HSD pin may cause the jittering at LX. A 10Ω

resistor and 0.1μF capacitor low-pass filter at the

HSD is able to mitigate the noise.

MIC2124YMM データシート(PDF) 18 Page - Micrel Semiconductor