L9908 datasheet(60/152 Pages) STMICROELECTRONICS

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Figure 34. Pre-drivers HIZ mode behavior

The behavior of the driver depending on the DRV_HIZ and HBn_DIS setting reflects the following truth table:

Table 57. Pre-drivers behavior truth table

DRV_HIZ

HBn_DIS

Description

Pre-driver enabled

Pre-driver disabled

Pre-driver in high impedance (Default)

Pre-driver disabled

Note:

above described condition in Disable or HIZ conditions are valid for LS drivers as long as VPRE ≥ 2.6 V and for

HS as long as VDH ≥ 2.6 V. If these conditions do not hold despite the configuration the drivers are

automatically in HIZ mode and the ext. FET Vgs is not driven actively.

Table 58. Pre-driver timings

Symbol

Parameter

Test Condition

Min Typ Max Unit

Notes

DRV_pwm_freq

PWM Frequency

kHz

Consumption

Limited(1)

DRV_pwm_dc

HS Duty Cycle in PWM mode

100

Not subject to

production

test(2)

DRV_hs_on_dly

HS Pre-driver switch ON total

propagation delay

(T_logic_+T_hs_on_dly)

Rload = 2 kΩ

INHn*0.5 to GHS_n*0.1

SHS_n = 0 V

[n = 1,2,3]

170

400

DRV_hs_off_dly

HS Pre-driver switch OFF total

propagation delay

(T_logic_+T_hs_off_dly)

Rload = 2 kΩ

INHn*0.5- GHS_n*0.9

SHS_n = 0 V

[n = 1,2,3]

170

400

L9908

Functional description

DS13546 - Rev 5

page 60/152

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