UM1556 datasheet(22/87 Pages) STMICROELECTRONICS

22 / 87 page

General items

UM1556

22/87

Doc ID 023520 Rev 2

●

Overtemperature, overload and short to GND can be distinguished from an open load

condition without the need of offstate diagnostics – no switchable pull up resistor is

required.

●

Detailed diagnostics without external components is possible.

1.4.7

Indication of power limitation, the advantages

●

The system reaction time on overload/short circuit events depends on various aspects.

The most important one is the first link in the chain: the diagnostics feedback of the

smart power device.

Figure 23.

System reaction time comparison

●

Indication of power limitation as diagnostics feedback allows almost instantaneous

overload/short circuit detection, as soon as the deltaT exceeds 60 K.

Table 5.

Analogue driver-truth table (ON-state)

Operation mode

Input level

Output level

Current sense

Normal operation

Vbat

IOUT/K

Short to Vbat

Vbat

<IOUT/K

Open load

Vbat

0 V

Short to GND

VSENSEH

Overload

PWM

Power limitation

VSENSEH

Vbat

No power limitation

>nominal

Overtemperature

VSENSEH

UM1556 Datasheet(PDF) 22 Page - STMicroelectronics

UM1556 Datasheet(HTML) 22 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87

Datasheet Download

Link URL