UM1692 datasheet(13/42 Pages) STMICROELECTRONICS

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UM1692

General description

4.2.1

Charge pump

The L6472 device uses an internal charge pump for driving correctly the integrated

MOSFETs, a voltage higher than the motor power supply. The charge pump is obtained

through an oscillator and few external components.

Figure 8. Charge pump circuitry

4.2.2

Advanced current control

The following configuration gives good results with most of motors:



Minimum ON time = 4 µs.



Minimum OFF time = 21 µs.



Max. fast decay = 10 µs.



Max. fast decay at step change = 16 µs.



Target switching time = 48 µs.



Predictive current control enabled.

The impact of the timing parameters are explained in the application note AN4158: “Peak

current control with automatic decay adjustment and predictive current control: basics and

setup”.

Table 3. L6472 Recommended operating conditions

Symbol

Parameter

Test condition

Value

Unit

VDD

Logic Interface supply voltage

3.3

Motor supply voltage

VSA = VSB = VS

8 ÷ 45

VOUT_diff

Differential between voltage VSA, OUTI1A, OUT2A, PGND

and VSB, OUT1B, OUT2B, PGND pins

VSA = VSB = VS

Up to 45

VREG in

Logic supply voltage

VREG internal

VADC

Integrated ADC input voltage range (ADCIN pin)

0 ÷ VREG

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