UAA2016

4

MOTOROLA ANALOG IC DEVICE DATA

Figure 2. Comparison Between Proportional Control and ON/OFF Control

Overshoot

Time (minutes, Typ.)

Time (minutes, Typ.)

Time (minutes, Typ.)

Heating

Power

P(W)

Room

Temperature

T (

°C)

Time (minutes, Typ.)

Proportional Band

Proportional Temperature Control

D Reduced Overshoot

D Good Stability

ON/OFF Temperature Control

D Large Overshoot

D Marginal Stability

TP is centered on the zero–crossing.

AC Line

Waveform

ILatch

TP

IHold

Figure 3. Zero Voltage Technique

Gate Current

Pulse

f = AC Line Frequency (Hz)

Vrms = AC Line RMS Voltage (V)

Rsync = Synchronization Resistor (Ω)

T

P +

14 x Rsync ) 7

105

Vrms

(

µs)