U210B1 Datasheet, PDF (4/12 Pages) TEMIC Semiconductors – Phase Control Circuit Load Current Feedback Applications

U210B1
96 11565
Pulse Output Stage
V₁₀
The pulse output stage is short circuit protected and can
V₉
typically deliver currents of 125 mA. For the design of
smaller triggering currents, the function I_GT = f (R_GT) has
been given in the data sheets in the appendix. In contrast
to the TEA1007, the pulse output stage of the U210B1 has
no gate bypass resistor.
Automatic Retriggering
t₁
t₂
t_tot
The automatic retriggering prevents half cycles without
current flow, even if the triac is turned off earlier e.g., due
to not exactly centred collector (brush lifter) or in the
t
event of unsuccessful triggering. After a time lapse of
t_pp = 4.5 t_p is generated another triggering pulse which is
repeated until either the triac fires or the half cycle
finishes.
General Hints and Explanation of Terms
Figure 4. Soft–start
To ensure safe and trouble-free operation, the following
points should be taken into consideration when circuits
are being constructed or in the design of printed boards.
t₁ = build-up of supply voltage
t₂ = run-up time
t_tot = total start-up time to required speed
Control Amplifier
The integrated control amplifier with differential input
m has a bipolar current output, with typically ±110 A at
m Pin 9 and a transmittance of typ. 1000 A/V. The amplifi-
cation and frequency response are determined by external
circuit. For operation as a power control, it should be con-
nected with Pin 7. Phase angle of the firing pulse can be
adjusted by using the voltage at Pin 8. An internal limiting
circuit prevents the voltage on Pin 9 becoming more
negative than V₁₃ + 1 V.
D The connecting lines from C₂ to Pin 6 and Pin 2 should
be as short as possible, and the connection to Pin 2
should not carry any additional high current such as
the load current. When selecting C₂, a low tempera-
ture coefficient is desirable.
V
Mains
Supply
95 10716
p/2
p
3/2p
2p
V_GT
Trigger
Pulse
t_p
t_pp = 4.5 t_p
Load Current Detection, Figure 2
Voltage drop across R₈, dependent of load current, gener-
ates an input-current at Pin 11 limited by R₅. Proportional
output current of 0.44 x I₁₁ (CTR) is available at Pin 12.
It is proportional with respect to phase and amplitude of
load current.
Capacitor C₃ integrates the current whereas resistor R₇
evaluates it. The voltage obtained due to load current
proportionality, can be used according to the application
i.e., load current compensation or load current regulation.
V_L
Load
Voltage
I_L
ö
Load
Current
F
Figure 5. Explanation of terms in phase relationship
4 (12)
TELEFUNKEN Semiconductors
Rev. A1, 28-May-96