L6751C datasheet(9/57 Pages) STMICROELECTRONICS

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L6751C

Pin description and connection diagrams

CS6N

Channel 6 current sense negative input. Connect through an Rg resistor to the

output-side of the channel inductor. When working at < 6 phases, still connect

through Rg to CS6P and then to the regulated voltage. Filter the output-side of

Rg with 100 nF (typ.) to GND.

CS6P

Channel 6 current sense positive input. Connect through an R-C filter to the

phase-side of the channel 6 inductor. When working at < 6 phases, short to

the regulated voltage.

CS5P

Channel 5 current sense positive input. Connect through an R-C filter to the

phase-side of the channel 5 inductor. When working at < 5 phases, short to

the regulated voltage.

CS5N

Channel 5 current sense negative input. Connect through an Rg resistor to the

output-side of the channel inductor. When working at < 5 phases, still connect

through Rg to CS5P and then to the regulated voltage. Filter the output-side of

Rg with 100 nF (typ.) to GND.

CS4N

Channel 4 current sense negative input. Connect through an Rg resistor to the

output-side of the channel inductor. When working at < 4 phases, still connect

through Rg to CS4P and then to the regulated voltage. Filter the output-side of

Rg with 100 nF (typ.) to GND.

CS4P

Channel 4 current sense positive input. Connect through an R-C filter to the

phase-side of the channel 4 inductor. When working at < 4 phases, short to

the regulated voltage.

CS3P

Channel 3 current sense positive input. Connect through an R-C filter to the

phase-side of the channel 3 inductor. When working at < 3 phases, short to

the regulated voltage.

CS3N

Channel 3 current sense negative input. Connect through an Rg resistor to the

output-side of the channel inductor. When working at < 3 phases, still connect

through Rg to CS3P and then to the regulated voltage. Filter the output-side of

Rg with 100 nF (typ.) to GND.

CS2N

Channel 2 current sense negative input. Connect through an Rg resistor to the

output-side of the channel inductor. Filter the output-side of Rg with 100 nF

(typ.) to GND.

CS2P

Channel 2 current sense positive input. Connect through an R-C filter to the

phase-side of the channel 2 inductor.

CS1P

Channel 1 current sense positive input. Connect through an R-C filter to the

phase-side of the channel 1 inductor.

CS1N

Channel 1 current sense negative input. Connect through an Rg resistor to the

output-side of the channel inductor. Filter the output-side of Rg with 100 nF

(typ.) to GND.

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 on page 44 for details.

Table 2. Pin description (continued)

Pin no.

Name

Type

Function

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