MIC5021 查看數據表（PDF） - Microchip Technology

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MIC5021

High-Speed, High-Side MOSFET Driver with Charge Pump and Overcurrent Limit

Microchip Technology 

MIC5021

10μF

TTL Input

MIC5021

1

V DD

8

V BOOST

2

Input

7

Gate

3

CT

4

Gnd

6

Sense-

5

Sense+

+20V to +36V

2.7

nF

Load

10μF

TTL Input

V+

MIC5021

1

V DD

8

V BOOST

2

Input

7

Gate

3

CT

4

Gnd

6

Sense-

5

Sense+

N-Channel

Power MOSFET

0.01

μF

Load

FIGURE 6-4:

Source.

Connecting Sense to

FIGURE 6-2:

12V to 36V Configuration.

10μF

TTL Input

MIC5021

1

V DD

8

V BOOST

2

Input

7

Gate

3

CT

4

Gnd

6

Sense-

5

Sense+

+20V to +36V

0.01

μF

Load

FIGURE 6-3:

Configuration.

Preferred 20V to 36V

Do not use both boost capacitors between VBOOST and

the MOSFET source and VBOOST and VDD at the same

time.

6.7 Current-Sense Resistors

Lead length can be significant when using low value

(<1Ω) resistors for current sensing. Errors caused by

lead length can be avoided by using four-terminal cur-

rent-sensing resistors. Four-terminal resistors are

available from several manufacturers.

6.8 Circuits without Current Sensing

Current sensing may be omitted by connecting the

SENSE+ and SENSE– pins to the source of the MOS-

FET or to the supply. Connecting the sense pins to the

supply is preferred for inductive loads. Do not connect

the sense pins to ground.

10μF

TTL INPUT

V+

MIC5021

1

V DD

8

V BOOST

2

INPUT

7

GATE

3

CT

4

GND

6

SENSE-

5

SENSE+

N-CHANNEL

POWER MOSFET

0.01

μF

LOAD

FIGURE 6-5:

Supply.

Connecting Sense to

6.9 Inductive Load Precautions

Circuits controlling inductive loads, such as solenoids

(Figure 6-6) and motors, require precautions when

controlled by the MIC5021. Wire wound resistors,

which are sometimes used to simulate other loads, can

also show significant inductive properties.

An inductive load releases stored energy when its cur-

rent flow is interrupted (when the MOSFET is switched

off). The voltage across the inductor reverses and the

inductor attempts to force current flow. Since the circuit

appears open (the MOSFET appears as a very high

resistance) a very large negative voltage occurs across

the inductor.

DS20005677A-page 12

 2016 Microchip Technology Inc.

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