U2100B-x ATMEL Corporation, U2100B-x Datasheet - Page 2

• Manufacturer Part Number: U2100B-x
• Description: Timer Control For Triac And Relay
• Manufacturer: ATMEL Corporation

Pin Description
General Description
The
U2100B can be used according to the mode selection in
relay or triac applications. Beyond that, it can be used in
triac applications for two-wire system as power switch
(the load in series to the switch), where the supply voltage
for the control unit is gained from phase rest angle
(a
U2100B
2 (8)
min
N
-operation).
L
N
monostable
L
Output
GND
Sync
–V
S
Figure 4. Three-wire circuit
Figure 3. Two-wire circuit
1
2
3
4
Figure 2. Pinning
integrated
U2100B
Control
Control
power-control
8
7
6
5
V
Osc
TRIG
EN
Ref
circuit
For three-wire switch systems, two operation modes 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 the external voltage
at the sync. input Pin 4 (clamping). Mode selection deter-
mines the current requirement of the relay’s or triac’s
driver stage and hence the selection of supply voltage.
Zero Voltage Switch Operation (Figure 5)
Selection condition:
V
where:
I
I
I
V
Required firing pulse width t
where:
I
P
R
S
P
X
L
Pin
4
M
sync
1
2
3
4
5
6
7
8
= internal sync. limitation, without external clamping
I
R
t
[ kW ] [
tot
p
1
+ 2 w arcsin
= Supply current of IC without load
= Average trigger current I
= External circuit current requirement
= Mains voltage
= Triac latching current
= Power at load Z
[ 0.85
= I
Symbol
Output
TRIG
GND
Sync
V
–V
Osc
S
EN
Ref
+ I
S
V
p
M
V
[ V ]
2 I
+ I
M
Reference point
Supply voltage
Driver output
Synchronisation and mode selection
Enable
Input trigger signal
RC Oscillator
Reference voltage
–V
tot
X
I
P
L
S
1.8
2 sin w
V
2
M
p
Function
10
G
–2
t
p
Rev. A3, 15-Jan-01
[ s ] – 0.7
–176