L99H92 datasheet(10/77 Pages) STMICROELECTRONICS

10 / 77 page

Device in active mode with INPMODE=0 (FULL-BRIDGE MODE)

Inputs

Outputs (in case of no faults)

OUTE

bit

AFWE bit

FWS

bit

FSINB

DIR

PWM

HS1

LS1

HS2

LS2

OFF

1. In this case, when the FSINB input pin goes from high to low, the device moves from active mode to fail-safe mode. In fail-

safe mode the OUTE control bit is automatically reset and all the gate drivers are forced in sink switch mode so that all the

MOSFETs are actively switched off with the maximum available discharge current.

2. In this case, the MOSFET is passively switched off through the internal resistive connection between gate and related

source. In all the other cases where the MOSFET is off, it is actively switched off and forced off by the gate driver working in

sink switch mode.

•

If INPMODE = 1, the device works in dual half-bridge mode. The two half-bridges can be driven separately

by IN1 and IN2 input pins and can be individually disabled through DIS1 and DIS2 control bits.

Table 3. Dual half-bridge mode

Device in active mode with INPMODE=1 (DUAL HALF-BRIDGE MODE)

Inputs

Outputs (in case of no faults); x=1,2

FSINB

OUTE bit

DISx bit

HSx

LSx

Inx

OFF(1)

All the other cases

OFF

1. In this case, the MOSFET is passively switched off through the internal resistive connection between gate and related

source. In all the other cases where the MOSFET is off, it is actively switched off and forced off by the gate driver working in

sink switch mode.

“Inx” means ON if logic level on Inx pin input is high and vice versa.” Inx” means OFF if logic level on Inx pin input

is high and vice versa (x=1,2).

2.6.2

Slew rate control (SLEW)

The rising and falling voltage slopes at the outputs can be controlled through slew rate control bits. When the

SLEWzx control bits are all set to zero the gate drivers will work in switch mode providing the maximum available

current to charge/discharge the MOSFETs input capacitance. The maximum available source/sink current in

switch mode is internally limited (IGHx(Ch) and IGLx(Ch)). If any value different from zero is programmed, then

the gate drivers will work as current source, instead of low impedance switch, as long as during the MOSFET

turning on/off the drain-source voltage over the MOSFETs is above/below the switch threshold (VDSHxfSW and

VDSHxrSW). Once the switch threshold is reached, the drivers will work in switch mode. The gate drivers source

(charge) and sink (discharge) currents can be independently programmed through dedicated control bits in order

to have different output voltage slopes during the turning on and the turning off of the MOSFETs. The MOSFETs

gate charging current is programmed using the control bits SLEWCx[4:0], while the MOSFETs gate discharging

current is programmed using the control bits SLEWDx[4:0]. The gate current is set depending on the SLEWzx

control bits value according to the formula:

IGATE=SLEWzx4:031*IGATEMAX

(1)

SLEWzx can be either SLEWDx or SLEWCx, while IGATEMAX can be either IGLxymax or IGHxymax (y=r for source

current; y=f for sink current).

Programming SLEWzx[4:0] to 0 disables the slew rate control and enables gate driving through the low-

impedance switch during the entire turning on/off process.

L99H92

Gate drivers

DS14069 - Rev 4

page 10/77

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