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U2100B
Timer Control for Triac and Relay
Description
The timer control circuit, U2100B, uses bipolar technology. It has different mode selections (Zero voltage switch, Phase control, Relay control). The output stage is triggered according to input conditions. It can be used in triac application for two or three wire system as a power switch.
Features
D Adjustable and retriggerable tracking time D Window monitoring for sensor input D Enable input for triggering D Internal noise suppression (40 ms) and retrigger
blocking (640 ms)
Applications
D Motion detectors D Touch sensors D Timer
D Two or three wire application
Package: DIP8, SO8
8 –VRef C2 0.5 VRef + – Trigger signal 6 Trigger window + – 5 0.6 VRef
Supply voltage limitation Voltage control monitoring Sync Mode selection
2 –VS 4
C1 L R1 Rsync Load Z D1
Noise suppression 40 ms Retrigger delay 640 ms
Control logic
3 Output
RG
Vmains
1 Enable Ct 7 RC Oscillator Rt
95 9876
GND 0.6 VRef 0.5 VRef ON OFF Divider 1:210
N
Figure 1. Block diagram with external circuit
TELEFUNKEN Semiconductors Rev. A1, 30-May-96
1 (9)
U2100B
Pin Description
GND –VS Output Sync 1 8 VRef Osc TRIG Pin 1 2 3 4 5 6 7 8 Symbol GND –VS Output Sync EN TRIG Osc VRef Function Reference point Supply voltage Driver output Synchronisation and mode selection Enable Input trigger signal RC Oscillator Reference voltage
2
7
3
6
4
95 9945
5
EN
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 triacapplication 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 (amin-operation). L 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 determines the current requirement of driver stage for relay’s or triac’s and hence the selection of supply voltage.
Control
Zero Voltage Switch Operation, Figure 4
Selection condition: V4 = internal sync limitation, without external clamping R1 N
95 9949
[ 0.85 V2 –V I
M tot
S
Itot = IS + Ip + IX
Figure 2. Two wire circuit
L
whereas: = Supply current of IC without load IS = Average trigger current IG IP IX = External circuit current requirement VM = Mains voltage Required firing pulse width tp 2 arcsin +w
Control tp
ǒ Ǔ
IL VM P
Ǹ2
whereas: = Triac latching current IL P = Power at load Z N
95 9950
Figure 3. Three wire circuit
R sync[kW]
[ V [V]
M
Ǹ2 sin ǒw
1.8 10
t p[s] – 0.7
–2
Ǔ
–176
2 (9)
TELEFUNKEN Semiconductors Rev. A1, 30-May-96
U2100B
amin-operation, Figure 6
2 –VS D1 R1 L C1 4 Sync Z VM Rsync
Selection condition: –V4 = 6.5 to 7.8 V +V4 = int. limitation
R amax
3 Output 1 GND RG IG N
+R +R
sync
3.6 V V R(peak)–3.6 V 10 V 2 –10 V
R amin
sync
VM
Ǹ
95 9951
VR(peak) is the peak voltage of the rest phase angle, which should be high enough to generate the supply voltage, VS.
Figure 4.
DC Operation, Figure 5
Selection condition: +V4 = 6.1 V –V4 = int. limitation whereas: R0
2 –VS C1 BZX85 C22V Rsync
X c
D1 IN 4007
Co
Ro
Z L
[ 1ń10 X V –V X + 0.85 I I +I )I )I 1 C + w X
M S c tot tot S Rel 0 C
4 Sync Ra
VM 230 V~
1N4148 BZX55 6V8
3 Output RG IG 1 GND 4xBYX86 VM Co 230 V~ L Ro
95 9953
VR(peak)
2 –VS C1 1 GND
BZX85C22V N
N
Rel 3 Output IRel Rsync 4 Sync
Figure 6.
95 9952
Figure 5.
C1 Co Ro Rsync Ra RG D1
= = = = = =
=
100 mF/35 V 0.33 mF/250 V 390 W 220 kW 10 kW 390 W IN 4007
TELEFUNKEN Semiconductors Rev. A1, 30-May-96
3 (9)
U2100B
Tracking Time Pin 7
An internal RC oscillator with following divider stage 1:210 allows a very long and reproducible tracking time. RC-values for required final time, tt, can be calculated as follows: R t [W] [s] 10 + 1.6 t1024 C [mF]
t 6 t
V5 0 OFF T1 = 0.5 VRef Hysteresis T2 = 0.6 VRef ON VRef
95 9954
C t [mF]
[s] 10 + 1.6 t1024 R [W]
t 6 t t
t t [s]
+ C [mF]
R t [W] 10 6
1.6
1024
Figure 7. Trigger condition, Pin 5
Trigger Inputs Pins 5 and 6, Figures 7 and 8
Two AND-connected, identical inputs determine the trigger conditions of monostable time stages, i.e., both inputs must be in position “ON” so that the output is switched ON. The tracking time starts after the trigger conditions has elapsed. The output ON state is given until the tracking time is over. Input Pin 5 is a simple comparator whereas input Pin 6 is built up as a window discriminator. Noise suppression for tON = 40 ms guarantee, that there is no peak noise signals at the inputs which could trigger the circuit. At the same time, the retrigger is delayed for a duration of 640 ms (tOFF), to avoid noise signal to trigger the relay. T2 V6 0 ON OFF ON VRef
Figure 8. Trigger condition, Pin 6
95 995
T1
+ 0.5 V + 0.65 .