STPM098C datasheet(83/110 Pages) STMICROELECTRONICS

Part #	STPM098C

Description	Automotive dual digital 8-phase controller with PMBus™

PDF	110 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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83 / 110 page

3.14.6.4

Phase current balancing (PCB)

STPM098C integrates an in-loop current balancing architecture in order to control the phase current balancing.

This feature is accomplished by converting cycle by cycle the difference between the single phase current and the

loop average phase current. The converted value optionally multiplied by a factor A, is used to fine-tune the single

phase ON time to equalize all phase currents.

Figure 67. Phase current balancing simplified block diagram

DIGITAL

ISEN1

CFILT/VREF1

ISENm

ISEN2

GND

Iimi=1

1m Iimi=1

Comp1

GND

40MHz

Up/Down

1=Up

0=Down

Phase1 ON Time

Correction

PWMn rising edge

CS_COEFF<7:0>

The current balancing gain can be programmed by means of a dedicated PMBus™ command as follows:

A=CSCOEFF7:0×2−6

(50)

Where:

CS_COEFF [7:0] is the dedicated PMBus™ configuration register [1 ~ 256].

The default value is CS_COEFF = 0x80.

STPM098C

Functional description

DS14440 - Rev 1

page 83/110

STPM098C Datasheet(PDF) 83 Page - STMicroelectronics