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

(**)

TDE1897C

TDE1898C

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

voltage)

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 IPS, when the IPS is initially turned on. TDE1897

uses Diag2 to signal such condition, TDE1898 does not.

SOURCE DRAIN NDMOS DIODE

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

Forward On Voltage

1

1.5

V

Forward Peak Current

t = 10ms; d = 20%

2

A

Reverse Recovery Time

µs

200

ns

Forward Recovery Time

50

ns

THERMAL CHARACTERISTICS (*)

Θ Lim

Junction Temp. Protect.

135

150

°C

Thermal Hysteresis

30

°C

Ω) (*)

Turn on Delay Time

100

µs

Turn off Delay Time

20

µs

Input Switching to Diagnostic

Valid

100

µs

Note Vil < 0.8V, Vih > 2V @ (V+In > V–In); Minidip pin reference.

(*) Not tested.

TDE1897C - TDE1898C

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