MCP6C04 datasheet(40/54 Pages) MICROCHIP

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MCP6C04

DS20006179A-page 40

 2019 Microchip Technology Inc.

5.2

Typical Application Circuits

The following circuits give guidance on using the

MCP6C04 within common applications. They leave out

details and the design requirements followed.

5.2.1

MOTOR CURRENT MONITORS

Figure 5-9 shows a simplified DC motor current monitor

circuit with a regulated voltage supply. The MCP6C04

and its circuit are all connected to the same ground, for

better glitch performance. In this case, since IL is

non-negative, we choose VREF = VSS.

The ADC operates on a different supply; its ground will

be different due to I-R drops and glitches. The

differential input is tied to VREF, so that its CMRR can

reject differences between grounds.

FIGURE 5-9:

Motor Current Monitor for

Regulated Supply Voltage.

H-Bridge motor drive circuits can place their current

monitors in several positions. Figure 5-10 shows a few

possibilities:

• Position A – This uses a unidirectional monitor

(MCP6C04 at VA1 and VA2), with current polarity

determined by the timing of the switches (SWLT,

etc.)

• Positions B and C – This uses two unidirectional

monitors (on MCP6C04 at VB1 and VB2 and the

other at VC1 and VC2), with each one representing

one current polarity

• Position D – This uses a bidirectional monitor

(MCP6C04 at VD1 and VD2), with current polarity

determined by the output

- The monitor must function at and below

ground

- The monitor must withstand large switching

steps and glitches

- We caution that the MCP6C04 should not be

used in these conditions

Obviously, choosing different locations for the

monitor(s) gives trade-offs in accuracy and complexity.

For instance, the monitor at Position D directly

measures the motor current, but will have large voltage

swings at its VIP pin.

The switches are discrete semiconductor switches

(i.e., CMOS, Bipolar, IGFET, etc.).

FIGURE 5-10:

H-Bridge Motor Current

Monitor, With a Few Possible Monitor Locations.

2.2 µF

U1 (DUT)

MCP6C04-100

100 nF

+5V

RSH

IL < 20A

20 kΩ

2.2 mΩ

+48V

U2 (ADC)

MCP3xxx

2.2 µF

100 nF

+5V

VOUT

VREF

10 nF

VREF

VD1

VD2

SWRT

SWRB

SWLT

SWLB

VC2

VC1

VB2

VB1

VA2

VA1

VHV

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