UM1557 datasheet(49/111 Pages) STMICROELECTRONICS

tên linh kiện	UM1557

Giải thích chi tiết về linh kiện	The aim of this document is to give the design engineer

PDF	111 Pages

Scroll/Zoom	100%

nhà sản xuất	STMICROELECTRONICS [STMicroelectronics]

Trang chủ	http://www.st.com

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49 / 111 page

UM1557

Switching inductive loads

Doc ID 023521 Rev 2

49/111

External clamping circuitry examples

Table 7.

External clamping circuitry examples(1/2)

External clamping circuitry

–

1) Freewheeling diode and reverse battery diode)

Low cost

Load is reverse battery

protected

Only for small loads

(voltage drop and power

dissipation on reverse

battery protection diode Dr)

Slow demagnetization

2) Transil and diode (in parallel with the load)

Fast demagnetization

Load is reverse battery

protected

Only for small loads

(voltage drop and power

dissipation on reverse

battery protection diode Dr )

3) Freewheeling diode and reverse battery FET

Load is reverse battery

protected

Low peak power

dissipation on D during

demag. phase

Suitable for high current

inductive loads such as

DC motors

High number of ext.

components (cost)

Slow demagnetization

Vbat

GND

OUT

Rgnd

Dgnd

GND

Clamp

Vout

Iout

GND

OUT

Rgnd

Dgnd

GND

Clamp

Vout

Iout

GND

Vbat

GND

OUT

Rgnd

Dgnd

GND

Clamp

Iout

GND

PMOS

4k7

15V

GND

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