Figure 1

DIAGNOSTIC TRUTH TABLE

Diagnostic Conditions

Input

Output

Diag1

Diag2

Normal Operation

L

H

L

H

H

H

H

H

H

L

H

H

L

H

H

L

H

H

H

L

L

H

H

(**)

TDE1891

TDE1890

H

<H (*)

H

L

HH

L

H

H

H

H

Output DMOS Open

L

H

L

L

H

L

H

H

Overtemperature

L

H

L

L

H

H

L

L

H

L

L

L

L

L

L

(*) According to the intervention of the current limiting block.

(**) A cold lamp filament, or a capacitive load may activate the current limiting circuit of the I PS, when the IPS is initially turned on. TDE1891

uses Diag2 to signal such condition, TDE1890 does not.

SOURCE DRAIN NDMOS DIODE

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

Forward On Voltage

@ Ifsd = 2.5A

1

1.5

V

Forward Peak Current

t = 10ms; d = 20%

6

A

Reverse Recovery Time

If = 2.5A di/dt = 25A/

µs

200

ns

Forward Recovery Time

100

ns

THERMAL CHARACTERISTICS

Ø Lim

Junction Temp. Protect.

135

150

°C

Thermal Hysteresis

30

°C

Ω)

Turn on Delay Time

200

µs

Turn off Delay Time

40

µs

Input Switching to Diagnostic

Valid

200

µs

Note Vil < 0.8V, Vih > 2V @ (V+In > V–In)

TRUE

FALSE

HIGH

LOW

TDE1890 - TDE1891

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