MIC5060 datasheet(13/24 Pages) MICROCHIP

13 / 24 page

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2021 Microchip Technology Inc. and its subsidiaries

DS20006615A-page 13

MIC5060

5.4

Relay Driver

Some power relay applications require the use of a

separate switch or drive control, such as in the case of

microprocessor control of banks of relays where a logic

level control signal is used, or for drive of relays with

high power requirements. The combination of an

MIC5060 and a power FET also provides an elegant

solution to power relay drive.

FIGURE 5-4:

Relay Driver.

5.5

Motor Driver with Stall Shutdown

Tachometer feedback can be used to shut down a

motor driver circuit when a stall condition occurs. The

control switch is a 3-way type; the “START” position is

momentary and forces the driver ON. When released,

the switch returns to the “RUN” position, and the

tachometer’s output is used to hold the MIC5060 input

ON. If the motor slows down, the tach output is

reduced, and the MIC5060 switches OFF. Resistor “R”

sets the shutdown threshold.

FIGURE 5-5:

Motor Stall Shutdown.

5.6

Simple DC-DC Converter

The simplest application for the MIC5060 is as a basic

one-chip DC-DC converter.

As the output (Gate) pin has relatively high impedance,

the output voltage shown will vary significantly with

applied load.

FIGURE 5-6:

DC-DC Converter.

5.7

High-Side Driver with Load

Protection

Although the MIC5060 is reverse battery protected, the

load and power FET are not, in a typical high side

configuration. In the event of a reverse battery

condition, the internal body diode of the power FET will

be forward biased. This allows the reversed supply

access to the load.

The addition of a Schottky diode between the supply

and the FET eliminates this problem. The MBR2035CT

was chosen as it can withstand 20A continuous and

150A peak, and should survive the rigors of an

automotive environment. The two diodes are paralleled

to reduce switch loss (forward voltage drop).

FIGURE 5-7:

High-Side Driver with Load

Protection.

MIC5060

Control Input

OFF

IRF540

12V

Gate

Gnd

Source

Input

V+

10μF

OSRAM

HLX64623

MIC5060

Control Input

OFF

IRF540

12V

Gate

Gnd

Source

Input

V+

10μF

Guardian Electric

1725-1C-12D

MIC5060

Control Input

OFF

IRF540

12V

Gate

Gnd

Source

Input

V+

10μF

OSRAM

HLX64623

MIC5060

Gate

Gnd

Source

Input

V+

10μF

VOUT = 12V

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