L6460 datasheet(53/139 Pages) STMICROELECTRONICS

Numer części	L6460

Szczegółowy opis	SPI configurable stepper and DC multi motor driver

PDF	139 Pages

Scroll/Zoom	100%

Producent	STMICROELECTRONICS [STMicroelectronics]

Strona internetowa	http://www.st.com

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53 / 139 page

L6460

Switching regulator controller

Doc ID 17713 Rev 1

53/139

Figure 12.

Switching regulator controller functional blocks

13.1

Pulse skipping operation

Pulse skipping strategy has already been explained on main switching regulator section.

This regulator has 4 possible PWM duty cycles that can be changed writing in the

SelSwCtrPWM bits in the SwCtrCfg register using SPI.

Vout

Vsupply

Driver

Control

Logic

CurrentSense

Charge pump Voltage

Voltage

Loop Control

VFBRef

Under voltage

Threshold

Filter

From Central Logic

Regulator Freq

To Central Logic

undervoltage flag

Rsense

VSWDRV_gate

N-CH Fet

Vref = 3 V

Vref=0.8V

SelFBRef[1:0]

Uv Threshold 1

SelFBRef

Uv Threshold 2

Vref = 3V

Vref=0.8V

VSWDRV FB

VSWDRV SW

VSWDRW_sns

Table 12.

Switching regulator controller PWM specification

SwCtrCfg register

Duty cycle value

Comments

SelSwCtrPWM[1:0]

Typical

12%

22.5%

Default state

58%

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