L6370Q Просмотр технического описания (PDF) - STMicroelectronics

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L6370Q

2.5 A single high-side smart power switch

STMicroelectronics 

L6370Q

Circuit description

3.1

Diagnostic truth table

Table 7. Diagnostic truth table

Diagnostic conditions

Input

Output Diag1

Diag2

Normal operation

Open load condition (Io< Iold)

Short to Vs

Short-circuit to ground (IO = ISC) (1)

(ON-DELAY pin grounded)

Output DMOS open

Overtemperature

Supply undervoltage (Vs< Vsth2)

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1. A cold lamp filament, or a capacitive load may activate the current limiting circuit of the IPS, when the IPS

is initially turned on.

3.2

Input section

The input section is a high impedance differential stage with high common and differential

mode range. Built-in offset of +1.4 V (typical value) and a hysteresis of 400 mV (maximum

value) assure high noise immunity.

3.3

Diagnostic logic

The operating conditions of the device are permanently monitored and the following

occurrences are indicated by DIAG1/DIAG2 open drain output pins:

• Short-circuit versus ground. A current limit circuit fixes Isc = 3.2 A (typical value) the

maximum current that can be sourced from the OUTPUT pin (for more details see

Section 3.4: Short-circuit operation)

• Short-circuit versus Vs

• Undervoltage (UV)

• Overtemperature (OVT)

• Open load, if the output current is less than 3 mA (typical value)

• Output DMOS open according to Table 7

DocID022313 Rev 2

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