UM2640L-SM1-R datasheet(5/8 Pages) UTC

Part #	UM2640L-SM1-R

Description	TWO-PHASE UNIPOLAR DC BRUSHLESS MOTOR PRE-DRIVER IC

PDF	8 Pages

Scroll/Zoom	100%

Manufacturer	UTC [Unisonic Technologies]

Direct Link	http://www.utc-ic.com

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5 / 8 page

UM2640

CMOS IC

UNISONIC TECHNOLOGIES CO., LTD

5 of 8

www.unisonic.com.tw

QW-R109-027.D

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APPLI CAT I ON I N FORM AT I ON

The UTC UM2640 is a two-phase unipolar DC brushes motor pre-driver IC that features high voltage process

technology so that the driver works up to 60V.

It is suitable for high voltage fan motor applications where 48V operation is required.

[example of application circuit]

[Design Notes]

Above application example is designed for 48V operation with motor current of 300mA. It uses the following

components:

Hall Elements: HW101A (AKD)

TR1, TR2: 2SC4027A (UTC)

1. Design of R4 and R5

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Where; VCC is 48V, VCE of UTC UM2640 is 1.5V, VBE of TR1 is 0.7V. IB is the base current of TR1.

The pull down resistance R5 (connected to TR1) influences turn-off time of TR1.

A typical R5 value is ranging from 1k

Ω to 10kΩ. It is highly recommended to determine the value with actual

application for better noise performance.

UM2640L-SM1-R Datasheet(PDF) 5 Page - Unisonic Technologies