BTS5180-2EKA View Datasheet(PDF) - Infineon Technologies

Part Name

Description

Manufacturer

BTS5180-2EKA

Smart High-Side Power Switch

Infineon Technologies 

BTS5180-2EKA

5.3.2 Maximum Load Inductance

Power Stage

During demagnetization of inductive loads, energy has to be dissipated in the BTS5180-2EKA. This energy can

be calculated with following equation:

E

=

VDS(AZ)

×

--L----

RL

×

V-----S----–-----V----D---S---(--A---Z---)

RL

×

ln ⎝⎛1

–

V-----S---R-–---L--V--×--D---IS--L-(--A---Z---)⎠⎞

+

IL

(1)

Following equation simplifies under the assumption of RL = 0 Ω.

E

=

1--

2

×

L

×

I2

×

⎛

⎝

1

–

V-----S----–----V-V----SD---S---(--A---Z---)⎠⎞

(2)

The energy, which is converted into heat, is limited by the thermal design of the component. See Figure 12 for the

maximum allowed energy dissipation as a function of the load current.

1000

100

10

1

0

1

2

I L [A]

3

EAS180.vs d

Figure 12 Maximum Energy Dissipation Single Pulse, TJ(0) = 150 °C; VS = 13.5V

5.4

Inverse Current Capability

In case of inverse current, meaning a voltage VINV at the OUTput higher than the supply voltage VS, a current IINV

will flow from output to VS pin via the body diode of the power transistor (please refer to Figure 13). The output

stage follows the state of the IN pin, except if the IN pin goes from OFF to ON during inverse. In that particular

case, the output stage is kept OFF until the inverse current disappears. Nevertheless, the current IINV should not

be higher than IL(INV). Otherwise, the second channel can be corrupted and erratic behavior can be observed. If

the affected channel is OFF, the diagnostic will detect an open load at OFF. If the affected channel is ON, the

diagnostic will detect open load at ON (the overtemperature signal is inhibited). At the appearance of VINV, a

parasitic diagnostic can be observed at the unaffected channel. After, the diagnosis is valid and reflects the output

state. At VINV vanishing, the diagnosis is valid and reflects the output state. During inverse current, no protection

function are available.

Data Sheet

PROFET™+ 12V

17

Rev. 2.1, 2011-09-01

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