L9960 datasheet(42/95 Pages) STMICROELECTRONICS

42 / 95 page

Functional description

L9960, L9960T

42/95

DS11115 Rev 10

4.6

Driver configuration

The following features of the driver stage are configurable by SPI allowing to better fit it to

the application requirements and also to the type of load.



Slew rate control



Current limitation thresholds



Overcurrent thresholds



Thermal warning and Shutdown thresholds

4.6.1

Slew rate control

The slew rate of each high side power transistor of the bridge is controlled either during turn-

on and turn-off (current and voltage slew rate). The same setting is applied for both

switching phases. Moreover, the slew rate is configurable by SPI in order to get the best

trade-off between conducted/radiated EMI and power dissipation during switching.

The overall delay implemented between high-side and low-side transistor switching is

adjusted automatically to avoid any cross-conduction through one half-bridge in all

conditions (Tsw).

4.6.2

Current slew rate

The current slew rate can be set in real time by SPI.

The corresponding read/write bit is "ISR".

No external component is needed to select the current slew rate range.

Note:

(-) available in the D7 bit position in SPI command frame 3.

Current slew rate depends upon the ISR/NOSR configuration also on the following bits and

conditions (ILIM_REG, overcurrent or Tj) as defined in the table below.

Table 46. ISR

Bit config

Description

Condition

see table below

default value see table

Reset value

Table 47. Range current slew rate

Range/ condition

ISR

TDSR

NOSR

Comment

SLOW

Slow DI/DT

FAST

Fast DI/DT

SR disabled if ILIM_REG = 1

Or NOC=0

XXX

current slew rate not

controlled

Slew rate disabled if tj > Otwam

Slew rate disabled

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