MCP14A0153_15 datasheet(12/30 Pages) MICROCHIP

12 / 30 page

MCP14A0153/4/5

DS20005470A-page 12

 2015 Microchip Technology Inc.

4.0

APPLICATION INFORMATION

4.1

General Information

MOSFET drivers are high-speed, high-current devices

which are intended to source/sink high-peak currents to

charge/discharge the gate capacitance of external

MOSFETs or Insulated-Gate Bipolar Transistors

(IGBTs). In high frequency switching power supplies,

the Pulse-Width Modulation (PWM) controller may not

have the drive capability to directly drive the power

MOSFET.

MOSFET

driver

such

the

MCP14A0153/4/5 family can be used to provide

additional source/sink current capability.

4.2

MOSFET Driver Timing

The ability of a MOSFET driver to transition from a

fully-off state to a fully-on state is characterized by the

driver’s rise time (tR), fall time (tF) and propagation

delays (tD1 and tD2). Figure 4-1 and Figure 4-2 show

the test circuit and timing waveform used to verify the

MCP14A0153/4/5 timing.

FIGURE 4-1:

Inverting Driver Timing

Waveform.

FIGURE 4-2:

Noninverting Driver Timing

Waveform.

4.3

Enable Function

The enable pins (EN A,EN B) provide additional control

of the output pins (OUT). These pins are active high

and are internally pulled up to VDD so that the pins can

be left floating to provide standard MOSFET driver

operation.

When the enable pin input voltage’s are above the

enable pin high voltage threshold, (VEN_H), the

corresponding output is enabled and allowed to react to

the status of the Input pin. However, when the voltage

applied to the Enable pins falls below the low threshold

voltage (VEN_L), the driver’s corresponding output is

disabled and doesn't respond to changes in the status

of the Input pins. When the driver is disabled, the

output is pulled down to a low state. Refer to Table 4-1

for the Enable pin logic. The threshold voltage levels for

the Enable pin are similar to the threshold voltage

levels of the Input pin, and are TTL compatible.

Hysteresis is provided to help increase the noise

immunity of the enable function, avoiding false triggers

of the enable signal during driver switching.

There are propagation delays associated with the

driver receiving an enable signal and the output

reacting. These propagation delays, tD3 and tD4, are

graphically represented in Figure 4-3.

Input

Output

CL = 1000 pF

1 μF

0.1 μF

VDD = 18V

½ MCP14A0153

½ MCP14A0155

tD1

10%

90%

Input

Output

18V

VIH (Typ.)

VIL (Typ.)

tD2

Input

Output

CL = 1000 pF

1 μF

0.1 μF

VDD = 18V

½ MCP14A0154

½ MCP14A0155

tD1

10%

90%

Input

Output

18V

VIH (Typ.)

VIL (Typ.)

tD2

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