MC33886DH Просмотр технического описания (PDF) - Motorola => Freescale

Номер в каталоге

Компоненты Описание

производитель

MC33886DH

5.0 A H BRIDGE

Motorola => Freescale 

Freescale Semiconductor, Inc.

OUT1 and OUT2

These terminals are the outputs of the H-Bridge with

integrated output FET body diodes. The bridge output is

controlled using the IN1, IN2, D1, and D2 inputs. The outputs

have active current limiting above 6.5 A. The outputs also have

thermal shutdown (tri-state latch-OFF) with hysteresis as well

as short circuit latch-OFF protection.

A disable timer (time tb) incorporated to detect currents that

are higher than active current limit is activated at each output

activation to facilitate detecting hard output short conditions

(see Figure 7, page 9).

CCP

Charge pump output terminal. A filter capacitor (up to 33 nF)

can be connected from the CCP terminal and PGND. The device

can operate without the external capacitor, although the CCP

capacitor helps to reduce noise and allows the device to

perform at maximum speed, timing, and PWM frequency.

PERFORMANCE FEATURES

Short Circuit Protection

If an output short circuit condition is detected, the power

outputs tri-state (latch-OFF) independent of the input (IN1 and

IN2) states, and the fault status output flag is set logic Low. If

the D1 input changes from logic High to logic Low, or if the D2

input changes from logic Low to logic High, the output bridge

will become operational again and the fault status flag will be

reset (cleared) to a logic High state.

The output stage will always switch into the mode defined by

the input terminals (IN1, IN2, D1, and D2), provided the device

junction temperature is within the specified operating

temperature.

Active Current Limiting

The maximum current flow under normal operating

conditions is internally limited to ILIM (5.2 A to 7.8 A). When the

maximum current value is reached, the output stages are tri-

stated for a fixed time (ta) of 20 µs typical. Depending on the

time constant associated with the load characteristics, the

current decreases during the tri-state duration until the next

output ON cycle occurs (see Figures 7 and 13, page 9 and

page 12, respectively).

The current limiting threshold value is dependent upon the

device junction temperature. When -40°C < TJ < 160°C, ILIM is

between 5.2 A and 7.8 A. When TJ exceeds 160°C, the ILIM

current decreases linearly down to 2.5 A typical at 175°C.

Above 175°C the device overtemperature circuit detects TLIM

and overtemperature shutdown occurs (see Figure 5, page 8).

This feature allows the device to remain operational for a longer

time but at a regressing output performance level at junction

temperatures above 160°C.

Overtemperature Shutdown and Hysteresis

If an overtemperature condition occurs, the power outputs

are tri-state (latched-OFF) independent of the input signals and

the fault status flag is set logic Low.

To reset from this condition, D1 must change from logic High

to logic Low, or D2 must change from logic Low to logic High.

When reset, the output stage switches ON again, provided that

the junction temperature is now below the overtemperature

threshold limit minus the hysteresis.

Note Resetting from the fault condition will clear the fault

status flag.

Main Differences Compared to MC33186DH1

• COD terminal has been removed. Terminal 8 is now a Do

Not Connect (DNC) terminal.

• Terminal 20 is no longer connected in the 20 HSOP

package. It is now a DNC terminal.

• RDS(ON) max at TJ = 150°C is now 225 mΩ per each output

transistor.

• Maximum temperature operation is now 160°C, as

minimum thermal shutdown temperature has increased.

• Current regulation limiting foldback is implemented above

160°C TJ.

• Thermal resistance junction to case has been increased

from ~2.0°C/W to ~5.0°C/W.

33886

16

For More Information OMnOTTOhRiOsLAPrAoNdAuLOcGt,INTEGRATED CIRCUIT DEVICE DATA

Go to: www.freescale.com

Share Link: