L6758A datasheet(9/42 Pages) STMICROELECTRONICS

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L6758A

Pin description and connection diagrams

OSC

Oscillator pin.

It allows the programming of the switching frequency F

for the multi-

phase section. The pin is internally set to 1.0 V, frequency for multi-phase

is programmed according to the resistor connected to GND or VCC with a

gain of 10 kHz/μA. Leaving the pin floating programs a switching

frequency of 200 kHz. Effective frequency observable on the load results

as being multiplied by the number of active phases N. See

Section 10 for

details.

VR_RDY

VR ready.

Open drain output set free after SS has finished in multi-phase section

and pulled low when triggering any protection. Pull up to a voltage lower

than 3.3 V (typ.), if not used it can be left floating.

ENDRV

Enable driver.

CMOS output driven high when the IC commands the drivers. Used in

conjunction with the HiZ window on the PWM pins to optimize the multi-

phase section overall efficiency. Connect directly to external driver enable

pin.

SENDRV

Enable driver.

CMOS output driven high when the IC commands the drivers. Used in

conjunction with the HiZ window on the PWM pins to optimize the single-

phase section overall efficiency. Connect directly to external driver enable

pin.

PWM4

PWM4 output.

Connect to external driver PWM input. During normal operation the device

is able to manage HiZ status by setting and holding the PWMx pin to fixed

voltage. Pull to 5 V through a 1 k resistor to configure the multi-phase

section to work at 3 phases.

PWM2

PWM2 output.

Connect to external driver PWM input.

This pin is also used to configure HiZ levels for compatibility with drivers

and DrMOS. During normal operation the device is able to manage HiZ

status by setting and holding the PWMx pin to pre-defined fixed voltage.

PWM3

PWM3 output.

Connect to external driver PWM input. During normal operation the device

is able to manage HiZ status by setting and holding the PWMx pin to fixed

voltage. Pull to 5 V through 1 k resistor in conjunction with PWM4 to

configure the multi-phase section to work at 2 phases.

PWM1

PWM1 output.

Connect to external driver PWM input.

This pin is also used to configure HiZ levels for compatibility with drivers

and DrMOS. During normal operation the device is able to manage HiZ

status by setting and holding the PWMx pin to pre-defined fixed voltage.

Table 2. Pin description (continued)

Pin#

Name

Function

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