L9960T datasheet(50/95 Pages) STMICROELECTRONICS

50 / 95 page

Functional description

L9960, L9960T

50/95

DS11115 Rev 10

In order to take into account the junction temperature increase, the current limitation

threshold is dynamically adjusted.

Below a junction temperature of "OTwarn", the current limit "Ilim_H" linearly decreases from

dot A to dot B like as showed in Figure 24: Thermal current limitation adjustment.

When Tj exceeds OTwarn, then the Ilim_H is automatically decreased, proportionally with

temperature, down to Ilim_Tsd (dot C on Figure 24) in order to reduce the power dissipation

and preserve the device.

If, in case of a lower power dissipation, the junction temperature decreases below OTwarn_

hyst, then the Ilim_H consequently would increase staying always on C-B or B-A line.

It is possible changing the OTwarn and OTsd thresholds via SPI, and reading the ECHO

response as showed in the following tables.

Note:

(-) available in the R6,R5,R4 bit position in SPI command frame 4.

Note:

(-) available in the R6,R5,R4 bit position in SPI answer frame 7b.

Table 59. OTwarn_thr_var

Bit status

Description

Condition

000

Default value, Otwarn (150,

170) °C

001

-5

010

not allowed

011

not allowed

100

101

+10

110

+15

111

+20

Table 60. OTwarn_thr_var_echo

Bit status

Description

Condition

000

Default value, Otwarn (150,

170) °C

001

-5

010

not allowed

011

not allowed

100

101

+10

110

+15

111

+20

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