Features
•
Integrated Reverse Phase Control
•
Mode Selection:
– Zero-voltage Switch with Static Output
– Two-stage Reverse Phase Control with Switch-off
– Two-stage Reverse Phase Control with Dimming Function
Current Monitoring:
– High-speed Short-circuit Monitoring with Output
– High-current Monitoring with Integrating Buffer
Integrated Chip Temperature Monitoring
Adjustable and Retriggerable Tracking Time
External Window Adjustment for Sensor Input
Enable Input for Triggering
•
•
•
•
•
Multifunction
Timer IC
U2102B
Applications
•
•
•
•
•
•
Two- or Three-wire Applications
Motion Detectors
Time-delay Relays
Dimmers
Reverse Phase Controls
Timers
1. Description
The timer control circuit U2102B is based on bipolar technology. The output stage can
switch either a MOSFET or an IGBT. Two sensor inputs and the retriggerable and
adjustable tracking time useful for a wide range of applications. By using the reverse
phase-control technique, the resistive load can be dimmed without the need of a com-
pensation inductance. The integrated current monitoring function provides a very fast
switch-off in case of a short-circuit condition. No additional fuse is needed.
Rev. 4767B–INDCO–10/05
Figure 1-1.
Block Diagram
1
V
Ref
Voltage monitoring
16
Synchronization
2
3
4
Reverse
phase
control
15
Voltage limitation
13
5
RC oscillator
Control
Divider
logic
Push
pull
14
12
6
Programing
Current monitoring
11
Triggering with buffers
7
8
9
Temperature
monitoring
Test logic
10
2
U2102B
4767B–INDCO–10/05
U2102B
2. Pin Configuration
Figure 2-1.
Pinning DIP16/SO16
VREF 1
CRAMP 2
RRAMP 3
CONTROL
OSC
PROG
EN
TRIGGER
4
16 SYNC
15
14
13
+VS
VO
GND
IOFF
II
TEST
V9
U2102B
5
6
7
8
12
11
10
9
Pin Description
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Symbol
VREF
CRAMP
RRAMP
CONTROL
OSC
PROG
EN
TRIGGER
V9
TEST
II
IOFF
GND
VO
+VS
SYNC
Function
Reference voltage 5 V
Ramp capacitance
Current setting for ramp
Control voltage
RC oscillator
Tri-state programming
Enable input
Trigger input (window)
Window adjustment
Test output
Input current monitoring
Fast output current monitoring
Ground
Output voltage
Supply voltage
Synchronization input
3
4767B–INDCO–10/05
Figure 2-2.
4
R
1
33 kΩ/2 W
V
mains
230 V ~
68 kΩ
+V
S
Load
47 µF/25 V
C
1
14
3
Phase
+
4
-
12
13
100
Ω
Control
GND
Temp
monitoring
Reverse
R
G
R
sh
IGBT
15
Push pull
1
V
Ref
1 kΩ
2
Ramp
Voltage
limitation
Clock
Synchronization
16
Clock
generator
5
RC oscillator
Divider
Control
V
Ref
Stat. ZVS
logic
+
Current monitoring
+
-
100 mV
Test mode
(spike-
Enable
filter)
0.55
×
V
Ref
+ 0.2 V
9
U2102B
Q Q
R S
POR
-
500 mV
11
1 nF
1 kΩ
10 nF
1 MΩ
R
2
C
3
22 kΩ
820 kΩ
R
3
Control
100 kΩ
C
Ref
Voltage
monitoring
C
2
Block Diagram with Typical Circuit for DC Loads
1 µF
6
+V
S
GND
0.02
×
V
Ref
220 nF
V
Ref
2 stage/out
2 stage
Buffer
120 ms
Clock
Test logic
Clock
+V
S
GND
Enable
0.1/0.4
0.5
×
V
Ref
7
Buffer
10
V
Ref
+
8
-
Trigger window
+
-
0.45
×
V
Ref
- 0.2 V
9
Trigger
signal
Window
adjustment
9
NTC
4767B–INDCO–10/05
U2102B
3. Power Supply, Synchronization Pins 15 and 16
The U2102B’s voltage limitation circuit enables the power supply via the dropping resistor R
1
. In
the case of DC loads, the entire supply current flows into pin 16 and is supplied via an internal
diode to pin 15, where the resultant supply voltage is limited and smoothed by C
1
. The pull-down
resistor at pin 16 is necessary in order to guarantee reliable synchronization. As a result, the rec-
tified and divided line voltage appears at pin 16, where the amplitude is limited. The power
supply for the circuit can be realized in all modes for DC loads as shown in
Figure 2-2 on page 4.
The voltage at pin 16 is used to synchronize the circuit with the mains and generate the system
clock required for the buffers. The circuit detects a “zero crossing” when the voltage at pin 16
falls below an internal threshold of approximately 8 V.
Figure 3-1.
Power Supply for DC Loads (R
1
is Identical with R
sync
)
V
mains
R
1
= R
sync
Sync.
16
+V
S
15
Voltage
limitation
Push
pull
14
Temp.
monit.
GND
13
C
1
IGBT
R
G
Load
R
sh
R
1
is calculated as follows:
V
Nmin
–
V
S
-
R
1max
=
0.85
×
---------------------------
I
tot
where:
V
Nmin
= V
mains
– 15%
V
S
I
tot
= Supply voltage
= I
Smax
+ I
x
I
Smax
= Maximum current consumption of the IC
I
x
= Current consumption of the external components
5
4767B–INDCO–10/05
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