MODE

EN\FAULT

ENx

INx

OUTx

‘x’ Half-bridge condition

0

0

X (1)

X(1)

High Z (2)

Disabled

0

1

0

X(1)

High Z (2)

Disabled

0

1

1

0

GND

LS on

0

1

1

1

HS on

1. X: don’t care.

2. High Z: high impedance

MODE

EN\FAULT

INxH

INxL

OUTx

‘x’ Half-bridge condition

1

0

X(1)

X(1)

High Z (2)

Disabled

1

1

0

0

High Z (2)

Disabled

1

1

0

1

GND

LS on

1

1

1

0

HS on

1

1

1

1

High Z (2)

Disabled (interlocking)

1. X: don’t care.

5.3

PWM current limiter

The device implements a PWM current limiter.

The load current is sensed through the SNS pin monitoring the voltage drop across an external resistor connected

between the source of the low side power MOSFET (SENSEx pins) and ground.

are disabled (high impedance) until the end of count of the timer.

During current decays the inputs values are ignored until the system returns to ON condition (decay time expired).

sense resistors value.

Equation 1

(1)

VREF=RSENSE×ILOAD,peak

The choice of sense resistors value must be take into account two main issues:

•

The sensing resistor dissipates energy and provides dangerous negative voltages on the SENSE pins during

the current recirculation. For this reason the resistance of this component should be kept low (using multiple

resistors in parallel will help obtaining the required power rating with standard resistors).

•

STSPIN830

PWM current limiter

DS12584 - Rev 2

page 10/27