ST52T301 datasheet(46/100 Pages) STMICROELECTRONICS

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D7 D6 D5 D4 D3 D2 D1 D0

REG_CONF8

TRIAC / PWM

TCLSB - Prescaler init value

Least Significative Bits

D7 D6 D5 D4 D3 D2 D1 D0

REG_CONF9

TRIAC / PWM

TCMSB - Prescaler init value

Most Significative Bits

Figure 10.2. TRIAC/PWM Configuration Register 8 and 9

The PWM period can be generated, internally, by

dividing the master clock or, externally, by using an

external clock signal.

In both cases, the clock signal is divided by a 16-bit

Prescaler, managed by REG_CONF8 an d

REG_CONF9 (see Figure 10.2).

The duty cycle is fixed by a value, that can be either

the output of a fuzzy inference or the result of an

arithmetic calculus. In the first case, it can be

loaded directly in the register of the peripheral,

otherwise it can be stored in one location of the

used for the control of the PWM.

Burst Mode

It is based on turning on and off the TRIAC, for a

fixed integer number of main voltage periods, in

order to control the power transferred to the load.

For this reason a Burst Mode TRIAC control

consists of a signal, with a period, T, containing an

integer number of the main voltage periods, whose

duty cycle is proportional to the number of periods

in which the TRIAC is ON (Duty Cycle). This kind of

Triac control is mainly used for thermal regulation.

The duty cycle is fixed by a valuethat can be directly

the output of a fuzzy inference or the result of an

arithmetic calculus.

In order to work in Burst mode, it is necessary to

detect the pre-post zero-crossing of main voltage,

by using an external inserting circuitry.

The user can define the period T, by means of the

internal 16-bit prescaler, setting REG_CONF8 and

REG_CONF9 (see Figure 10.2).T is proportional to

the main voltage period, it is in the range 0 to 21.8

sec (if the main frequency is 50Hz).

The width and the polarity of the pulses can be

programmed according to the Triac and the circuit

characteristics.

Phase Angle Partialization Mode

This method is based on turning on the TRIAC only

for a part (phase angle) of each main voltage

period. When the phase angle is large the energy

(power) supplied to the load is low, viceversa, when

the phase angle is small the energy supplied to the

load is high.

The phase angle can be fixed by a fuzzy algorithm

or by a value stored in the Register File.

The phase angle is an 8-bit value.

The peripheral is programmable in order to work

with a main voltage frequency of 50 or 60 Hz.

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ST52T301/E301

ST52T301 数据表(PDF) 46 Page - STMicroelectronics

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