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 11. Main switching regulator functional blocks

Main switching regulator

VSupply

Current Sense

Charge pump Voltage

High Side

Driver

From Central Logic

Control

Logic

Voltage

Loop Control

-

+

Regulator Freq

Regulator Ref

VSWmain_SW

La

Ra

C

VSWmain_FB

Rb

Under voltage flag

To Central Logic

Filter

-

+

Under voltage

Threshold

In pulse skipping control the duty cycle must be chosen by the user depending on supply

voltage and output regulated voltage. Therefore the switching regulator has 4 possible duty

cycles that can be changed by writing the VmainSwSelPWM bits in the MainSwCfg register

according to following Table 10.

Table 10. Main switching regulator PWM specification

MainSwCfg register

Duty cycle value

VmainSwSelPWM[1:0]

00

01

10

11

Typical

12%

15%

26%

63.5%

Comments

Default state

The output current is limited to a value that can be set by means of SelIlimit bit in the

MainSwCfg register according to following Table 11.

Table 11. Main switching regulator current limit

SelIlimit

Current limit (min)

0

3.3A

1

2.3A

Comments

Default state

Doc ID 17713 Rev 1

51/139

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