ST52T301 datasheet(49/100 Pages) STMICROELECTRONICS

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Normally the Triac firing pulses start 1/3 Tp before

the zero crossing and the lengthof the pulses is Tp,

see Figure 10.5.

The length Tp of the pulses is programmable by

using UTP value, that is a 14-bits number, obtained

with REG_CONF12(5:0) bits, UTPMSB, and

REG_CONF13, UTPLSB (see figure 10.12 and

table 10.6):

UTP(13:0) = [UTPMSB(5:0) UTPLSB(7:0)]

TP =TMCLK * UTP

The value Tp is in the range 0 to 4.9 ms when the

clock master is 20 MHz.

According to REG_CONF11(0) configuration

(1)

(0.5)

0.5

Negative

Triac Gate

Current

2/3 Tp

1/3 Tp

Positive

Triac Gate

Current

Power

Line

II and III quadrants

I and IV quadrants

Figure 10.5. Burst Mode pulse polarity

Figure 10.6 Burst Mode Zero Crossing Circuit

MAIN1

MAIN2

-1.5

-1

-0.5

0.5

1.5

Main Voltage

TRIACOUT

TMASK

Figure 10.7 Burst Mode Zero Crossing

MCLK

Frequency

min

max

5 MHz

0.0012 ms

19.6608 ms

10 MHz

0.0006 ms

9.8304 ms

20 MHz

0.0003 ms

4.9152 ms

pulses polarity; in order to obtain positive or

negative gate Triac currents, allowing to work

respectively in I and IV quadrants, or in the II and

III quadrants (see Figures 10.5 and 10.12).

To increase the immunity of the peripheral against

the electrical noise of the main voltage, a

pr og r am m a bl e ma sk i ng t im e, by u s in g

REG_CONF11(5:2) bits, TCMSK (see Table 10.5)

49/99

ST52T301/E301

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