BTS5231-2GS 参数 Datasheet PDF下载

Smart High-Side Power Switch

BTS5231-2GS

Diagnosis

Table 1

Truth Table

(cont’d)

1)

Input

Level

H

(ON-State)

Output Level

~

V

bb

<

V

bb

~GND

Z

Diagnostic Output

SEN = H

SEN = L

Z

Z

Z

Z

Z

Z

Operation Mode

Normal Operation (ON)

Current Limitation

Short Circuit to GND

Over-Temperature

Short Circuit to

V

bb

Open Load

V

bb

V

bb

I

IS

=

I

L

/

k

ILIS

V

IS

=

V

IS(fault)

V

IS

=

V

IS(fault)

V

IS

=

V

IS(fault)

I

IS

<

I

L

/

k

ILIS

Z

1) L = Low Level, H = High Level, Z = high impedance, potential depends on leakage currents and external circuit

4.3.1

ON-State Diagnosis

The standard diagnosis signal is a current sense signal proportional to the load current.

The accuracy of the ratio (

k

ILIS

=

I

L

/

I

IS

) depends on the temperature. Please refer to

for details. Usually a resistor

R

IS

is connected to the current sense pin. It is

recommended to use sense resistors

R

IS

> 500

Ω.

A typical value is 4.7 kΩ

4000

3500

3000

2500

k

ILIS

2000

1500

1000

500

0

0.5

1

I

L

/A

1.5

2

2.5

dummy

T

j

= 150°C

dummy

T

j

= -40°C

Figure 14

Current Sense Ratio

k

ILIS1)

1) The curves show the behavior based on characterization data. The marked points are guaranteed in this Data

Sheet in

(Position

Data Sheet

19

V1.2, 2008-09-01