L6460 datasheet(75/139 Pages) STMICROELECTRONICS

75 / 139 page

L6460

Power bridges

Doc ID 17713 Rev 1

75/139

voltage thresholds) using serial interface. The feedback reference voltage is selected by

writing the SelFBRef[1:0] bits in the Aux1SwCfg or Aux2SwCfg registers.

The switching regulators have four possible PWM duty cycles that can be changed using

SPI according to Table 28.

14.1.7

Regulation loop

As seen before L6460 contains 2 regulation loops for switching regulators that are used

when bridge 3 is used as a regulator. These loops are assembled using internal

comparators and filters similar to that used in main switching regulator.

When bridge 3 is not used for this purpose or when only one regulation loop is needed, the

control loop is available on a GPIO output thus enabling the customer to assembly a basic

buck switching regulator using an external Power FET. The comparators used in the above

mentioned regulation loops are general purpose low voltage (3.3 V) comparators; when the

relative regulation loop is not used they can be accessed as shown in the Figure 20.

Figure 20.

Internal comparator functional block diagram

Table 28.

PWM specification

AuxXPWMTable[1:0]

Typical duty cycle value

Comments

10%

13%

Default state for AUX1

24%

Default state for AUX2

61%

GPIOz

GPIOx

DECODE

LOGIC

GPIOy

DECODE

LOGIC

GPIOz Logic

Driver

V3v3

GPIOz

DECODE

LOGIC

GPIOz Value From SPI

GPIOzMod

GPIOyMode

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