BTS6480SF datasheet(20/73 Pages) INFINEON

20 / 73 page

Data Sheet

Rev. 1.0, 2010-04-12

SPOC - BTS6480SF

Power Stages

6.3.1

Bulb and LED mode

Channel 2 and channel 3 can be configured in bulb and LED mode via the SPI registers HWCR.LEDn. During LED

mode following parameters are changed for an optimized functionality with LED loads: On-state resistance

DS(ON), switching timings (tdelay(ON), tdelay(OFF), tON, tOFF), slew rates dV/dtON and dV/dtOFF, current protections IL(trip)

and current sense ratio

ILIS.

6.3.2

Switching Resistive Loads

When switching resistive loads the following switching times and slew rates can be considered.

Figure 7

Switching a Load (resistive)

6.3.3

Switching Inductive Loads

When switching off inductive loads with high-side switches, the voltage

OUT drops below ground potential,

because the inductance intends to continue driving the current. To prevent the destruction of the device due to

high voltages, there is a voltage clamp mechanism implemented, which limits that negative output voltage to a

certain level (

DS(CL) (6.6.2)). See Figure 6 for details. The device provides SmartClamp functionality. To increase

the energy capability, the clamp voltage

DS(CL) increases with the junction temperature Tj and load current IL.

Please refer also to Section 8.6. The maximum allowed load inductance is limited.

6.4

Inverse Current Behavior

During inverse currents (

OUT > VBB) the affected channel stays in ON- or in OFF-state. Furthermore, during

applied inverse currents no ERR-flag is set.

The functionality of unaffected channels is not influenced by inverse currents applied to other channels (except

effects due to junction temperature increase). Influences on the diagnostic function of unaffected channels are

possible only for the current sense ratio, please refer to

∆kILIS(IC) (9.8.3).

Note: No protection mechanism like temperature protection or current protection is active during applied inverse

currents. Inverse currents cause power losses inside the DMOS, which increase the overall device

temperature, which could lead to a switch off of the unaffected channels due to over temperature.

VOUT

SwitchOn.emf

tON

tOFF

90% of VBB

10% of VBB

70% of VBB

dV /

dtON

30% of VBB

70%

dV /

dtOFF

30%

tdelay(ON )

tdelay(OFF)

IN /

OUTx

tON(rise)

tOFF(fall)

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