L9969X datasheet(18/70 Pages) STMICROELECTRONICS

18 / 70 page

Functional description

3.1

Description of external interfaces

•

Voltage supply Vs can be connected directly to the battery voltage via a relay (for example the main relay

in an engine control system). Otherwise an additional external inverse voltage protection is necessary.

•

The load at the outputs is connected between both outputs (OUT1 and OUT2) in H-bridge mode.

•

The ASIC has two inputs controlling the current through the H-bridge: DIR controls the direction of the

current (DIR = 0 → Current flows from OUT1 → OUT2; DIR = 1 → Current flows from OUT2 → OUT1) and

PWM controls the magnitude of the current (duty cycle 0% → no current … duty cycle 100% → maximum

current).

3.2

Functional behavior in detail

All parameters are defined at (unless otherwise specified):

•

4.5 V < VDD < 5.5 V

•

VUF < VS < 28 V (power stages active)

•

0 V < VS < VUF (power stages inactive)

•

-40 °C < TJ < 150 °C

•

The HBR can withstand a VS of 40 V for load dump pulse (see Section 6: Load dump pulse)

•

It is recommended to perform the necessary adjustments at high temperature

•

All voltages refer to AGND

3.2.1

Power stages

L9969 provides a full H-bridge power stage, consisting of two half bridges, which are intended to be used mainly

for the control of DC motors.

The most critical loads are throttle-control actuators with the following electrical characteristics: inductance 0.8

mH to 1.0 mH, resistance 1.2 Ω to 1.8 Ω at room temperature, PWM-frequency fmin = 1 Hz and fmax = 20 kHz.

5 V < VBATT < 18 V, 4.5 V < VDD < 5.5 V, TJ= -40 °C to 150 °C, unless otherwise specified.

Table 12. Power stages parameters

Symbol

Parameter

Condition

Min Typ Max Unit

ROUT-GND Rds_ON resistance low side

IOUT = 3 A

10 V < VS < 28 V

Max. values at Tj= 150 °C

225 mΩ

ROUT-UB Rds_ON resistance high side

IOUT = 3 A

10 V < VS < 28 V

Max. values at Tj= 150 °C

315 mΩ

Ileak

OFF State leakage current H-bridge disabled by short circuit

detection; this is the current of one stage

VS = 13 V

OUTx = 0 V or VS

-200

200

µA

Ileak

OFF State leakage current VDD below VDD_RES

VS = 13 V

OUTx = 0 V or VS

-200

800

µA

3.2.2

Inverse current on VS

Inverse currents flow out of VS. An inverse current with maximum 5 A decreasing during a maximum period of 250

ms does not lead to any destruction of the H-bridge ASIC. After exposure to such an inverse current, the full

functionality of the device is guaranteed (according to the product target specification).

L9969x

Functional description

DS14029 - Rev 6

page 18/70

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