BTS5012SDA datasheet(21/27 Pages) INFINEON

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Datasheet

Rev. 1.1, 2008-11-04

Smart High-Side Power Switch

BTS5012SDA

Diagnosis

For diagnosis purpose, the BTS5012SDA provides an IntelliSense signal at the pin IS.

The pin IS provides during normal operation a sense current, which is proportional to the load current as long as

bIS > 5V. The ratio of the output current is defined as kILIS = IL / IIS. During switch-on no current is provided, until

the forward voltage drops below

ON < 1V typ. The output sense current is limited to IIS(lim).

The pin IS provides in case of any fault conditions a defined fault current

IS(fault) as long as VbIS >8V. Fault

conditions are overcurrent (

ON > 1V typ.), current limit or overtemperature switch off.

The pin IS provides no current during open load in ON and de-energisation of inductive loads.

Figure 17

Block Diagram: Diagnosis

The accuracy of the provided current sense ratio (

ILIS = IL / IIS) depends on the load current. Please refer to

Figure 18 for details. A typical resistor

IS of 1 kΩ is recommended.

Sense.emf

b,IS

IS(fault)

Z,IS

Table 1

Truth Table

Parameter

Input Current Level

Output Level

Current Sense I

Normal operation

L1)

H1)

≈ 0 (IIS(LL))

nominal

Overload

≈ 0 (IIS(LL))

IS(fault)

Short circuit to GND

≈ 0 (IIS(LL))

IS(fault)

Overtemperature

≈ 0 (IIS(LL))

IS(fault)

Short circuit to

≈ 0 (IIS(LL))

< nominal2)

Open load

Z1)

≈ 0 (IIS(LL))

≈ 0 (IIS(LH))

1) H = “High” Level, L = “Low” Level, Z = high impedance, potential depends on external circuit

2) Low ohmic short to

bb may reduce the output current IL and therefore also the sense current IIS.

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