L9960T datasheet(38/95 Pages) STMICROELECTRONICS

38 / 95 page

Functional description

L9960, L9960T

38/95

DS11115 Rev 10

Note:

A minimum pulse width of 1 µs has to be guaranteed on driving control pins PWM/DIR for

the relative command acknlowdgement by internal logic.

In VVL mode, the bridge is controlled by these two inputs and according to the VVL status

as described in the table below:

A specific dead-time “TSW“ is implemented between high-side and low-side transistors

switching to avoid cross-conduction. It applies when switching from on-state to freewheeling

state and viceversa, regardless of the actual way to drive the H-bridge (PWD/DIR or

IN1/IN2). The total delay may be related to the switching Current slew rate selected by SPI.

The dead time is managed in the digital design, using analog feedback information from the

gate driver.

In order to avoid h-bridge misbehavior, it is strongly recommended to avoid working with

default settings: TSW_low_current = 0 is the only configuration allowed for all the

applications.

POR, BIST/HWSC and SW reset commands overwrite the configuration

TSW_low_current=0, so the application SW shall take care of resuming

TSW_low_current=1.

The bit TSW_low_current_echo is available for reading on the Configuration Request 1

Note:

(-) available in the D2 bit position in SPI command frame 3.

Reverse

HS Freewheeling(1)

1. It is advised against using this recirculation option in IN1/IN2 mode as L9960 is not safely protected against

external failures (i.e SCG). For IN1/IN2 mode only it is advised to recirculate (active freewheeling) on

low-side drivers only.

Table 41. IN1/IN2 mode H-bridge input (continued)

Inputs

Outputs (MOS Driver)

Condition

IN2 (DIR)

IN1 (PWM) OUT1_HS

OUT1_LS

OUT2_HS

OUT2_LS

Table 42. VVL mode H-bridge input

DIR

PWM

VVL phase

OUT1_HS

OUT1_LS

OUT2_HS

OUT2_LS

Condition

no active

with PWM=1

Forward

Reverse

T < TVVL

Freewheeling

T > TVVL

Tri-state

Table 43. TSW_low_current

Bit config

Description

Condition

Tsw activated on i_gate_fb only

Tsw activated on the last event between i_gate_fb or i_out_on

Reset value

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