ST52T301 datasheet(45/100 Pages) STMICROELECTRONICS

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10 TRIAC/PWM DRIVER

ST52x301 offers a peripheral able to generate a

signal on pin 24, TRIACOUT, to drive an external

device, like a TRIAC, a IGBT or a Power Mos.

Triac/PWM driver can perform 3 different working

modes according to REG_CONF10 bits, MODE

(see Table 10.4):

MODE = ”01”:

PWM

MODE = ”10”:

Burst Mode Triac Control

(Thermal Regulations)

Note: in this case CKSL of REG_CONF10 must

be set to ”1x”. (see Table 10.4)

MODE = ”11”:

Phase Angle Partialization

Triac Control (Motor Control)

The Triac/PWM Driver can be initialized by using a

value fixed by a controlalgorithm, that can be either

the output of a fuzzy inference or the result of an

arithmetic calculus stored in the Register File.

In the latter case, by using the LDPR 1,reg-i

instruction, the value, contained in the i-th register

of Register File, is stored in the Triac Driver/PWM

peripheral register PERIPH_REG_1.

Figure 10.1 shows th e internal structure of

Triac/PWM Driver.

PWM Mode

The PWM working mode is obtained by setting

REG_CONF10 bits, MODE, at ”01” value.

It consists of a signal, with fixed period , whose duty

cycle can be modified.

Figure 10.1. TRIAC/PWM Driver Simplified Block Diagram

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ST52T301/E301

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