L9301 datasheet(17/51 Pages) STMICROELECTRONICS

17 / 51 page

DocID028688 Rev 6

17/51

L9301

Configuration 1: 8 low side drivers

7.1

Configuration 2: 4 low-side PWM mode and 4 low-side drivers

In this configuration there are 4 low side drivers with integrated free-wheeling diodes and 4

low side drivers available. All the channels can be driven by SPI or by the parallel input. To

enable the OUT1-4 driving, the PWM enable SPI bit for OUT1-4 and SRC1-4 must be set.

The IN1-4 control the low side power OUT1-4 used to drive the LOAD1-4 and the device

should assure that when the low-side is switched off, the high-side, acting as a

free-wheeling diode, must be turned on. To avoid cross conduction the LS VGS voltage is

monitored.

When OUT1-4 are commanded ON either by INx or SPI, the L9301 switches off the HS first,

then with 2 μs delay after detecting HS VGS low, it switches on LS.

When OUT1-4 are commanded OFF either by INx or SPI, the L9301 switches off the LS

first, then with 2 μs delay after detecting LS VGS low, it switches on the HS.

IN5-8 control OUT5-8

The selected configuration must be configured by SPI.

The corresponding relations are:

–

IN1: OUT1 ↔ SRC2;

–

IN2: OUT2 ↔ SRC1;

–

IN3: OUT3 ↔ SRC4;

–

IN4: OUT4 ↔ SRC3

Figure 5. Configuration 2: 4 low-side PWM mode and 4 low-side drivers

L9301 数据表(PDF) 17 Page - STMicroelectronics