L6482 datasheet(32/73 Pages) STMICROELECTRONICS

32 / 73 page

Functional description

L6482

32/73

Doc ID 023768 Rev 2

The gate current can be set to one of the following values: 4, 8, 16, 24, 32, 64 and 96 mA

through the IGATE parameter in the GATECFG1 register (see Section 9.1.18).

Controlled current time can be programmed within range from 125 ns to 3.75

μs with a

resolution of 125 ns (TCC parameter in the GATECFG1 register) (see Section 9.1.18).

Turn-off overboost time can be set to one of the following values: 0, 62.5, 125, 250 ns

(TBOOST parameter in the GATECFG1 register). The 62.5 ns value is only available when

clock frequency is 16 MHz or 32 MHz; when clock frequency is 8 MHz it is changed to 125

ns and when a 24-MHz clock is used it is changed to 83.3 ns. (see Section 9.1.18).

6.16

Deadtime and blanking time

During the bridge commutation, a deadtime is added in order to avoid cross conductions.

The deadtime can be programmed within a range from 125 ns to 4

μs with a resolution of

125 ns (TDT parameter in the GATECFG2 register) (see Section 9.1.19).

At the end of each commutation the overcurrent and stall detection comparators are

disabled (blanking) in order to avoid the respective systems detecting body diode turn-off

current peaks.

The duration of blanking time is programmable through the TBLANK parameter in the

GATECFG2 register at one of the following values: 125, 250, 375, 500, 625, 750, 875, 1000

ns (see Section 9.1.19).

6.17

Integrated analog-to-digital converter

The L6482 integrates an NADC bit ramp-compare analog-to-digital converter with a

reference voltage equal to VREG. The analog-to-digital converter input is available through

the ADCIN pin and the conversion result is available in the ADC_OUT register

(Section 9.1.14).

The ADC_OUT value can be used for torque regulation or can be at the user’s disposal.

Figure 15.

Gate driving currents

Gate Current

Gate turn-on

gate

tCC

tOB

tCC

Gate charged

Gate discharged

Gate turn-off

AM15045v1

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