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TCA785 Datasheet(PDF) 2 Page - Infineon Technologies AG

Part No. TCA785
Description  Phase Control IC
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Maker  INFINEON [Infineon Technologies AG]
Homepage  http://www.infineon.com
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 2 page
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Semiconductor Group
2
TCA 785
Functional Description
The synchronization signal is obtained via a high-ohmic resistance from the line voltage
(voltage V5). A zero voltage detector evaluates the zero passages and transfers them to the
synchronization register.
This synchronization register controls a ramp generator, the capacitor C10 of which is charged
by a constant current (determined by R9). If the ramp voltage V10 exceeds the control voltage
V11 (triggering angle
ϕ), a signal is processed to the logic. Dependent on the magnitude of the
control voltage V11, the triggering angle
ϕ can be shifted within a phase angle of 0˚ to 180˚.
For every half wave, a positive pulse of approx. 30
µs duration appears at the outputs Q 1 and
Q 2. The pulse duration can be prolonged up to 180˚ via a capacitor C12. If pin 12 is connected
to ground, pulses with a duration between
ϕ and 180˚ will result.
Outputs
and
supply the inverse signals of Q 1 and Q 2.
A signal of
ϕ +180˚ which can be used for controlling an external logic,is available at pin 3.
A signal which corresponds to the NOR link of Q 1 and Q 2 is available at output Q Z (pin 7).
The inhibit input can be used to disable outputs Q1, Q2 and
,
.
Pin 13 can be used to extend the outputs
and
to full pulse length (180˚ –
ϕ).
Q 1
Q 2
Q 1
Q 2
Q 1
Q 2
Block Diagram




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