Data Sheet

18

Rev. 1.0, 2010-05-28

High Current H-Bridge

BTM7745G

Block Description and Characteristics

6.4.4

Device State

Inputs

Outputs

Mode

INH IN1

IN2

HS1 LS1 HS2 LS2 ST

Normal operation

0

0

0

OFF OFF OFF OFF 1

Stand-by mode, reset

1

0

0

OFF ON

OFF ON

1

–

1

0

1

OFF ON

ON

OFF 1

–

1

1

0

ON

OFF OFF ON

1

–

1

1

1

ON

OFF ON

OFF 1

–

Open-Load detection

mode

0

0

1

OFF OFF ON

OFF 1

Enable Open-load detection

0

1

0

ON

OFF OFF OFF 1

Enable Open-load detection

0

1

1

ON

OFF ON

Over-voltage (OV)

X

X

X

ON

OFF ON

OFF 0

Shut-down of LSS,

HSS activated, error detected

Under-voltage (UV)

X

X

X

OFF OFF OFF OFF 1

UV lockout, reset

Overtemperature or

short circuit of HSS or

1) In short circuit of HSS or LSS, the junction temperature will arise and as soon as the over temperature shut down threshold

is reached the device will shut down and latch the status. Short circuit of HSS and LSS itself won’t be detected as failure.

0

0

0

OFF OFF OFF OFF 1

Stand-by mode, reset of latch

1

X

X

OFF OFF OFF OFF 0

Shut-down with latch, error

detected

X

1

X

X

X

1

Current limitation

mode half bridge 1

1

0

X

ON

OFF X

X

0

Short Circuit in LS1 detected,

half bridge 2 operates in normal

mode

1

1

X

OFF ON

X

X

0

Short Circuit in HS1 detected,

half bridge 2 operates in normal

mode

0

1

X

OFF OFF X

X

0

Short Circuit in HS1 detected

Current limitation

mode half bridge 2

1

X

0

X

X

ON

OFF 0

Short Circuit in LS2 detected,

half bridge 1 operates in normal

mode

1

X

1

X

X

OFF ON

0

Short Circuit in HS2 detected,

half bridge 1 operates in normal

mode

0

X

1

X

X

OFF OFF 0

Short Circuit in HS2 detected

Truth Table

Inputs:

Switches

Status Flag ST:

0 = Logic LOW

OFF = switched off

0 = Logic LOW (error)

1 = Logic HIGH

ON = switched on

1 = Logic HIGH (normal operation)

X = 0 or 1

X = switched on or off