TLE75620-EST datasheet(37/81 Pages) INFINEON

37 / 81 page

Datasheet

Rev. 1.0

2017-11-23

TLE75620-EST

SPIDER+ 12V

Power Stages

The synchronization bits influence only how the channels react to Over Load or Over Temperature conditions.

Synchronized channels have to be switched ON and OFF individually by the micro-controller.

7.4

“Bulb Inrush Mode” (BIM)

Although TLE75620-EST is optimized for relays and LED, it may be necessary to use one or more of the outputs

as high-side switches to drive small lamps (typically 2 W) or electronic loads with a big input capacitor. In such

operative conditions, at the switch ON an inrush current may appear, reaching the overload current threshold

which latches the channel OFF (see Chapter 8.1 for further details). In normal operation the device waits until

the microcontroller sends an SPI command to clear the latches (register HWCR_OCL) allowing the channel to

turn ON again. Usually this delay is too long to transfer enough energy to the load.

If the corresponding bit BIM.OUTn is set to “1”, in case the channel reaches the overload current threshold or

the overtemperature threshold and latches OFF, it restarts automatically after a time tINRUSH, allowing the load

to go out of the inrush phase. A time diagram is shown in Figure 19. As shown, the counter starts when the

channel is switched ON. Every channel switch OFF (independently from the entity controlling the channel - see

Figure 20 for further details) resets the bit BIM.OUTn to “0”.

While BIM.OUTn bits are set to “1”, ERRn bits may be also set to “1” but this doesn’t latch the channel OFF.

An internal timer set the bit BIM.OUTn back to “0” after 40 ms (parameter tBIM) to prevent an excessive thermal

stress to the channel, especially in case of short circuit at the output.

TLE75620-EST allows a per-channel selection of Bulb Inrush Mode (BIM) in order to be fully flexible without any

additional reliability risk.

Figure 19 Bulb Inrush Mode (BIM) operation

7.5

Automatic PWM Generator

The TLE75620-EST has two independent automatic PWM generator implemented. Each PWM generator can be

assigned to one or more channels, and can be programmed with a different duty cycle and frequency.

Both PWM generator refer to a base frequency fINT generated by an internal oscillator. This base frequency can

be adjusted using HWCR_PWM.ADJ bits as described in Table 9.

INn

ILn

PowerStage_BIM.emf

tBIM

ERRn

IL(OVL0)

OUT.OUTn

BIM.OUTn

IL(OVL1)

tINRUSH

tOVLIN

0 1 0

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