TLE75620-EST datasheet(36/81 Pages) INFINEON

36 / 81 page

Datasheet

Rev. 1.0

2017-11-23

TLE75620-EST

SPIDER+ 12V

Power Stages

7.1.3

Maximum Load Inductance

During demagnetization of inductive loads, energy has to be dissipated in the TLE75620-EST. Equation (7.1)

and Equation (7.2) can be used for high-side switches (auto-configurable switches can use all equations,

depending on the load position):

(7.1)

(7.2)

The maximum energy, which is converted into heat, is limited by the thermal design of the component. The

EAR value provided in Table 2 assumes that all channels can dissipate the same energy when the inductances

connected to the outputs are demagnetized at the same time.

7.2

Inverse Current Behavior

During inverse current (VOUTn_S > VOUTn_D) in high-side configuration or (VOUTn > VSn) the affected channels stays

in ON- or in OFF- state. Furthermore, during applied inverse currents the ERRn bit can be set if the channel is

in ON-state and the over temperature threshold is reached.

The general functionality (switch ON and OFF, protection, diagnostic) of unaffected channels is not influenced

by inverse currents applied to other channels. Parameter deviations are possible especially for the following

ones (Over Temperature protection is not influenced):

• Switching capability: tON, tOFF, dV/dtON, -dV/dtOFF

•Protection: IL(OVL0), IL(OVL1)

• Diagnostic: VDS(OL), VOUT_S(OL), IL(OL)

Reliability in Limp Home condition for the unaffected channels is unchanged.

Note:

No protection mechanism like temperature protection or over load protection is active during

applied inverse currents. Inverse currents cause power losses inside the DMOS, which increase the

overall device temperature. This could lead to a switch OFF of unaffected channels due to Over

Temperature

7.3

Switching Channels in parallel

In case of appearance of a short circuit with channels in parallel, it may happen that the two channels switch

OFF asynchronously, therefore bringing an additional thermal stress to the channel that switches OFF last. In

order to avoid this condition, it is possible to parametrize in the SPI registers the parallel operation of two

neighbour channels (bits HWCR.PAR). When operating in this mode, the fastest channel to react to an Over

Load or Over Temperature condition will deactivate also the other. The inductive energy that two channels

can handle once set in parallel is lower than twice the single channel energy (see P_7.6.11). It is possible to

synchronize the following couples of channels:

• channel 0 and channel 2 → HWCR.PAR (0) set to “1”

• channel 1 and channel 3 → HWCR.PAR (1) set to “1”

• channel 4 and channel 6 → HWCR.PAR (2) set to “1”

• channel 5 and channel 7 → HWCR.PAR (3) set to “1”

EVS V

–

OUTS CL

()

VOUTS CL

()

---------------------------

RL I

⋅

VOUTS CL

()

---------------------------

–

⎝⎠

⎛⎞ I

⋅

------

⋅⋅

EVS V

–

OUT CL

()

VOUT CL

()

------------------------

RL I

⋅

VOUT CL

()

------------------------

–

⎝⎠

⎛⎞ I

⋅

------

⋅⋅

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