L8150 datasheet(14/37 Pages) STMICROELECTRONICS

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General description

L8150

14/37

4.5

Protection Functions

–

Over-current protection: Low side current recirculation for both smooth and

rectangular drive in normal working condition.

–

Over-voltage protection: compare motor supply VDC (140V, 280V) and IC internal

reference. All power transistor OFF (all 6 outputs = GND) during over-voltage.

Return to normal operation if VDC is recovered from over-voltage condition. An

hysteresis is present.

Lower voltage protection: all power TR OFF (all 6 outputs = GND), if VCC is lower than a

defined voltage threshold (All power Transistors OFF if VCC is between 0 to the defined

voltage threshold). Return to normal operation if VCC is recovered from lower voltage

condition. An hysteresis is present.

Thermal protection: all power transistors OFF by external thermal sense signal. If signal is

high (exceeds Vth), the power is OFF (all 6 output = GND).

Hall sensor fail protection: all power transistor OFF (all output = GND) if Hall signals are

HHH or LLL (Hall signals after digital filter are used).

Power ON reset (SD): internal logic reset when power ON or recovery from short time Power

OFF. All power transistor OFF (all 6 outputs = GND) during reset.

4.6

PWM

carrier frequency: 17-21kHz for Tj = 0 to 125 deg, 18kHz - 20.4kHz for Tj = 25 °C.

4.7

System Clock

Internal oscillator: Fsys =1/Tck= 9.8 MHz typical value.

One pin for external resistor sets the clock frequency (OSC pin).

4.8

External HVIC Bootstrap Capacitor Initialization

Lower arm ALL ON (3 outputs for low side are High, 3 outputs for High side are GND) when

VSP becoming ON (free run release), (while this initialization should not be done when VSP

becoming OFF) initializing time is 0.333 - 0.5 msec.

4.9

Package

28 pins SO28. It is suitable for both reflow and flow soldering.

4.10

Others

Upper and lower arm PWM during rectangular drive; it means both side (upper and lower)

chopping, not one side chopping, during rectangular drive).

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