Analog Integrated Circuit Device Data

Freescale Semiconductor

21

33486A

FUNCTIONAL DESCRIPTION

FUNCTIONAL DEVICE OPERATION

OPERATIONAL MODES

Table 5. TRUTH TABLE

Standard H-Bridge Conditions

IN1

IN2

WAKE

OUT1

OUT

GLS1

GLS2

ST

Comment

Normal Operation

X

X

0

Z

Z

L

L

1

Standby Mode

0

0

1

L

L

H

H

1

Brake to Ground

1

0

1

H

L

L

H

1

Direction 1

0

11L

H

H

L

1

Direction 2

1

1

1

H

H

L

L

1

Not Recommended

(9)

Undervoltage

XX

1

L

L

H

H

1

(10)

Overvoltage

XX

1

L

L

H

H

1

(10)

Overtemperature High-Side 1

H

L1L

L

H

H

0

(11)

Overtemperature High-Side 2

LH

1

L

L

H

H

0

(11)

Overcurrent High-Side 1

1X1

Z

X

L

X

0

(12)

Overcurrent High-Side 2

X1

1X

Z

X

L

0

(12)

Overcurrent Low-Side 1

X

X

1

Z

Z

LL0

(13)

Overcurrent Low-Side 2

X

X

1

Z

Z

LL0

(13)

Legend

0, L = Low level.

1, H = High level.

X = Don’t care.

Z = High impedance.

Notes

9.

damage the 33486A. The current recirculation in the low-side MOSFET is a preferred solution, with IN1=0 and IN2=0.

10.

Once the overvoltage condition or undervoltage condition is removed, the H-Bridge recovers its normal operation mode.

11.

When the thermal shutdown is reached on one of the high-side MOSFETs, both high sides are turned off with the motor tied to ground.

When the overtemperature condition is finished, the H-Bridge recovers it previous normal operation mode.

12.

The high-side MOSFET HSn that experienced an overcurrent is latched off. The corresponding output OUTn is open. Once the high-

side overcurrent condition is removed, the input INn must be reset in order to recover the normal operation mode.

13.

low-side overcurrent is removed, the input INn of the output that experienced the fault must be reset in order to recover the normal

operation mode. Figure 22, Overload on Low-Side 1, page 18, shows an example. If an overload happens in low-side 1, OUT1 and

OUT2 are both put in high impedance. IN2 must be reset to recover normal mode.