UC19431
UC29431
UC39431
UC39431B
APPLICATION INFORMATION (cont.)
Optocoupler Application
tions with power supply and voltage, and the need to
suffer the additional voltage drop of a series resistor.
The two amplifier circuit architecture employed in the
UC39431 is most advantageous for the optocoupler ap- Magnetic Amplifier Controller Application
plication. The error amplifier provides a fixed open loop
The UC39431 makes an excellent controller for magnetic
gain that is available to apply flexible loop compensation
amplifier regulated outputs. Working from either a square
of either poles or zeroes. A fixed transconductance am-
wave drive or from a PWM signal controlled by another
plifier provides a linear current source compared to the
output, a saturable reactor provides highly efficient con-
typical transistor’s exponential output characteristics. It
trol, requiring only a reset current which can be gener-
also eliminates the traditional optocoupler’s CTR varia-
ated from its own output.
UDG-95090
Figure 3. Magnetic amplifier controller application.
5
TI [ TEXAS INSTRUMENTS ]
