TLE4971 datasheet(9/23 Pages) INFINEON

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Datasheet

Revision 1.02

19-08-2022

TLE4971

Datasheet

Fast Over-Current Detection

(OCD)

The Over-Current Detection (OCD) function allows

fast detection of over-current events. The raw

analog output of the Hall probes is fed directly into

comparators with programmable switching

thresholds. A user programmable deglitch filter is

implemented to enable the suppression of fast

switching transients. The two different open-drain

OCD pins are active low and can be directly

combined into a wired-AND configuration on

board level to have a general over-current

detection signal. TLE4971 supports two

independent programmable OCD outputs, suited

for different application needs.

The OCD pins are providing a very fast response,

thanks to independence from the main signal path.

They can be used as a trap functionality to quickly

shut down the current source as well as for precise

detection of soft overload conditions.

OCD pins external connection

The OCD pins can be connected to a logic input pin

of the microcontroller and/or the gate-driver to

quickly react to over-current events. They are

designed as open-drain outputs to easily setup a

wired-AND configuration and allow monitoring of

several current sensors outputs via only one

microcontroller pin.

OCD thresholds

The symmetric threshold level of the OCD outputs

is adjustable and triggers an over-current event in

case of a positive or negative over-current. The

possible threshold levels are listed in Table 7 and

Table 8. The instruction for the settings is

documented in the TLI4971 programming guide

and the TLE4971 addendum.

OCD outputs timing behavior

Both output pins feature a deglitch filter to avoid

false triggers by noise spikes on the current rail.

Deglitch filter settings can be programmed

according to application needs. Available options

are listed in Table 7 and Table 8.

Figure 3 shows the OCD output pin typical

behavior during an over-current event.

Over-current Pulse 1: duration exceeds the over-

current response time tD_OCDx + response time jitter

ΔtD_OCDx + deglitch filter time tdeglitch. The OCD

output voltage is set low until the current value

drops below the OCD threshold.

Over-current Pulse 2: duration does not exceed

the over-current response time tD_OCDx and

therefore no OCD event is generated.

Over-current Pulse 3: duration exceeds the

response time tD_OCDx + response time jitter

ΔtD_OCDx, but does not exceed the glitch filter time

tdeglitch and no OCD event is generated.

BTHR

2 x BTHR

VOCD

tD_OCDx

VDD

0.5 x VDD

ΔtD_OCDx

tdeglitch

Glitch

counter

threshold

tOC < (tD_OCDx + ΔtD_OCDx)

tD_OCDx

ΔtD_OCDx

tD_OCDx

tdeglitch

tOC < (tD_OCDx + ΔtD_OCDx + tdeglitch)

ΔtD_OCDx

tOCD_low

Figure 3 Fast over-current detection output timing

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