MCP14628 datasheet(12/24 Pages) MICROCHIP

12 / 24 page

MCP14628

DS22083A-page 12

FIGURE 5-1:

Turn On Current Paths.

The charge needed for the turning on of the high-side

power MOSFET comes from the bootstrap capacitor

CBOOT. Current flows from CBOOT through the internal

HIGHDR circuitry, into the gate of the high-side power

MOSFET, out the source, and back to CBOOT. The

printed circuit board traces that construct this current

loop need to have a small area and low inductance. To

control the inductance, short and wide traces must be

used.

Figure 5-2 depicts the current flow paths when the

outputs of the MCP14628 are low and the power

MOSFETs are turned off. These current paths should

also have low inductance and a small loop area to

minimize voltage ringing and spiking.

FIGURE 5-2:

Turn Off Current Paths.

The following recommendations should be followed to

allow for optimal circuit performance.

- The components that construct the high

current paths previously mentioned should be

placed close the MCP14628. The traces

used to construct these current loops should

be wide and short to keep the inductance and

impedance low.

- A ground plane should be used to keep both

the parasitic inductance and impedance

minimized. The MCP14628 is capable of

sourcing and sinking high peaks current and

any extra parasitic inductance or impedance

will result in non-optimal performance.

VCC

PWM

CVCC

CBOOT

VSUPPLY

MCP14628

Control

Logic

VCC

PWM

CVCC

CBOOT

VSUPPLY

MCP14628

Control

Logic

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