L9959 datasheet(20/49 Pages) STMICROELECTRONICS

20 / 49 page

Electrical specifications

L9959

20/49

DocID027540 Rev 3

Note:

If the value of the connected load is below 5 kΩ no Open Load is detected; whereas if the

value of the connected load is more than 50 kΩ, Open Load is detected.

If the load is in the range between (5 to 50) kΩ, the Open Load diagnosis could be not

reliable.

3.6

Temperature dependent current reduction

Note: see also Figure 17: Temperature dependent current reduction.

3.7

Free-wheeling diodes

Table 17. Open-load detection

Symbol

Parameter

Test condition

Min.

Typ.

Max.

Unit

ROL

Open-load detection threshold

-5

kΩ

tDIAGOL

Open-load diagnosis enable delay

Guaranteed through

scan.

100

150

tDIAGOL1 Open-load diagnosis filter time1

2.4

3.6

tDIAGOL2 Open-load diagnosis filter time2

200

300

μs

Vout1_OFF Out1 voltage regulator

1.67

1.97

Table 18. Retest delay

Symbol

Parameter

Test condition

Min.

Typ.

Max.

Unit

tdelay retest Retest delay for failures: SCB, SCG, SCL Guaranteed through scan. 290

350

410

μs

Table 19. Temperature dependent current reduction

Symbol

Parameter

Test condition

Min.

Typ.

Max.

Unit

|IL_TSD|

Current limit at TSD

1.4

2.5

3.6

TILR

Start of temperature dependent

current reduction

150

165

°C

TSD

Thermal shut-down

175

°C

TSD-TILR

Range of temperature dependent

current reduction

202530

°C

TfTSD

Thermo-shut-down detection filter time Guaranteed through scan.

μs

Table 20. Free-wheel diodes

Symbol

Parameter

Test condition

Min.

Typ.

Max.

Unit

Free-wheeling diode forward voltage

IOUT = 3 A

Tit(1)

Free-wheeling diode reverse recovery time

100

1. Not subject to production test; specified by design.

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