L6460 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

L6460

SPI configurable stepper and DC multi motor driver

STMicroelectronics 

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L6460

Figure 12. Switching regulator controller functional blocks

Switching regulator controller

V supply

Charge pump Voltage

CurrentSense

Driver

From Central Logic

Control

Logic

SelFBRe[f1:0]

Vref = 3 V

Vref = 3V

Vref=0.8V

Vref=0.8V

Voltage

Loop Control

-

+

Regulator Freq

VFBRef

undervoltage flag

To Central Logic

SelFBRef

Filter

Uv Threshold 1

Uv Threshold 2

-

+

Under voltage

Threshold

Rsense

V SWDRW_sns

V SWDRV_gate

VSWDRV SW

N-CH Fet

La

VSWDRV FB

Ra

C

V out

Rb

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.

Table 12. Switching regulator controller PWM specification

SwCtrCfg register

SelSwCtrPWM[1:0]

Duty cycle value

Typical

Comments

00

9%

01

12%

10

22.5%

11

58%

Default state

Doc ID 17713 Rev 1

53/139

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