U2100B Datasheet, PDF (2/9 Pages) TEMIC Semiconductors – Timer Control for Triac and Relay

U2100B
Pin Description
GND ¹
–V_S 2
Output 3
Sync ₄
8 V_Ref
7 Osc
6 ^TRIG
5 ^EN
Pin Symbol
Function
1 GND Reference point
2 –V_S Supply voltage
3 Output Driver output
4 Sync Synchronisation and mode selection
5
EN Enable
6 TRIG Input trigger signal
7 Osc RC Oscillator
8 V_Ref Reference voltage
95 9945
General Description
Monostable integrated power control circuit, U2100B,
can be used according to mode selection in relay’s or
triac’s applications. Beyond that, it can be used in triac-
application for two wire system as power switch, (being
the load in series to the switch) whereas the supply
voltage for the control unit is gained from phase rest angle
a( _min-operation).
L
Control
N
95 9949
Figure 2. Two wire circuit
L
Control
For three wire switch, two modes of operations are
possible:
– Zero voltage switch operation for triac control
– Static operation for relay control
Mode Selection Pin 4 and Supply Voltage
Pin 2
Operation modes can be selected by external voltage at
the sync. input Pin 4 (clamping). Mode selection deter-
mines the current requirement of driver stage for relay’s
or triac’s and hence the selection of supply voltage.
Zero Voltage Switch Operation, Figure 4
Selection condition:
V₄ = internal sync limitation, without external clamping
[ R₁
0.85
V_M–V_S
2 I_tot
I_tot = I_S + I_p + I_X
whereas:
I_S = Supply current of IC without load
I_P = Average trigger current I_G
I_X = External circuit current requirement
V_M = Mains voltage
+ ǒ Ǹ Ǔ Required firing pulse width tp
w ^{tp 2 arcsin IL VM}
P2
N
95 9950
Figure 3. Three wire circuit
whereas:
I_L = Triac latching current
P = Power at load Z
W [ R_sync[k ] ^VM[V]
Ǹ _{ǒ Ǔ w 2 sin}
t_p[s] – 0.7
1.8 10^–2
–176
2 (9)
TELEFUNKEN Semiconductors
Rev. A1, 30-May-96