L6751 datasheet(10/59 Pages) STMICROELECTRONICS

10 / 59 page

Pin description and connection diagrams

L6751

10/59

Doc ID 023992 Rev 1

A10

SOSC

Oscillator pin.

It allows the switching frequency FSSW to be programmed for the single-phase

section. The pin is internally set to 1.02 V, frequency for single-phase is

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

of 11.5 kHz/µA. Leaving the pin floating programs a switching frequency of

230 kHz. See Section 10 for details.

SREF

The reference used for the single-phase section regulation is available on this

pin with -125 mV offset. Connect through an RSREF-CSREF to GND to optimize

DVID transitions. Connect through RSOS resistor to the SFB pin to implement

small positive offset to the regulation.

A11

Thermal monitor sensor.

Connect with proper network embedding NTC to the multi-phase power

section. The IC senses the power section temperature and uses the

information to define the VR_HOT signal and temperature monitoring.

By programming proper TCOMP gain, the IC also implements load-line and

IMON/ILIM thermal compensation for the multi-phase section.

In JMode, the pin disables the single-phase section if shorted to GND.

Pull up to VCC5 with 1 k

Ω to disable thermal sensor.

See Section 8 for details.

B10

SPWM /

SEN

PWM output.

Connect to single-phase external driver PWM input. During normal operation

the device is able to manage HiZ status by setting and holding the pin to a

fixed voltage defined by PWMx strapping.

Connect to VCC5 with 1 k

Ω to disable the single-phase section.

A12

SENDRV

Enable driver.

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

conjunction with the HiZ window on the SPWM pin to optimize the single-

phase section overall efficiency. Connect directly to external driver enable pin.

B11

ILIM

Multi-phase section current limit.

A current proportional to the multi-phase load current is sourced from this pin.

Connect through a resistor RLIM to GND. When the pin voltage reaches 2.5 V,

the overcurrent protection is set and the IC latches. Filter through CLIM to GND

to delay OC intervention.

A13

VR_HOT

Voltage regulator HOT.

Open drain output, this is an alarm signal asserted by the controller when the

temperature sensed through the ST or TM pins exceed TMAX (active low).

See Section 8 for details.

B12

TCOMP

Thermal monitor sensor gain.

Connect proper resistor divider between VCC5 and GND to define the gain to

apply to the signal sensed by the TM to implement thermal compensation for

the multi-phase section. Short to GND to disable temperature compensation

(but not thermal sensor). See Section 8 for details.

Table 2.

Pin description (continued)

Pin#

Name

Type

Function

L6751 датащи(PDF) 10 Page - STMicroelectronics

L6751 датащи(HTML) 10 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59

датащи скачать

ссылки URL