L9960 datasheet(47/95 Pages) STMICROELECTRONICS

47 / 95 page

DS11115 Rev 10

47/95

L9960, L9960T

Functional description

Figure 20. Tdiag2 blanking time depends on the Vps voltage

During the active freewheeling phase, the current continues decreasing down to I_lim_L

threshold (with TlimL filter time implemented).

ILIM_REG diagnosis bit is set to "0" as soon as current goes below I_lim_L+hyst.

After current is below I_lim_L threshold during at least TlimL and t_off_min is elapsed,

L9960 exits CURRENT_LIMITATION (still with NOSR active).

The programmed VSR and ISR are set back if I < I_LIM_L and PWM='0'.

When IN1-IN2 mode, VSR and ISR are set back if I < I_LIM_L and IN1 (or IN2)='0',

depending on the toggling pin.

Figure 21. Slew rate switching strategy

VPS

Vps_norm

Vps_norm_hyst

Tdiag2

increase

Tdiag2

min

Tdiag2

increase

GAPGPS02338

GAPGPS02339

(end of blanking OR PWM falling edge)

t_off_min tempo is started at each HS switch-OFF while in NOSR mode

ILIM_REG

BLANKING

SLEW RATE

SSR/FSR

ILS

PWM

CURRENT_LIM

I_lim_L

I_lim_H

t_off_min

(toff_min)

Ignored

Tdiag2

(SV OC diag)

continued

Tdiag2

t_off_min

NOSR

limitation

we leave current

t_off_min,

AND after

Once (I < I_lim_L)

applied

mode) and toff_minisnot

(otherwise we remain in NOSR

we go back to normal SR

AND i_pwm = ‘0’,

When (I < I_lim_L)

NOSR: Increase Slew Rate

FSR: Fast Slew Rate

SSR: Slow Slew Rate

SSR/FSR

- PWM control remains active during blanking (user can switch-off)

falling edge in FSR, the ILIM_REG SPI bit is not set (MOS is switched-OFF by user).

device, user looses control). This information is latched in ILIM_REG SPI bit. When toff_min is started due to PWM

- Current limitation state is reached when I > I_lim_H at the end of blanking (MOS is switched-OFF by the

Note:

and go to NOSR

mode

we start blanking

Once I > I_lim_H,

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