Features
•Direct Supply from the Mains
•Current Consumption ≤ 0.5 mA
•Very Few External Components
•Full-wave Drive – No DC Current Component in the Load Circuit
•Negative Output Current Pulse Typically 100 mA – Short-circuit Protected
•Simple Power Control
•Ramp Generator
•Reference Voltage
Applications
•Full-wave Power Control
•Temperature Regulation
•Power Blinking Switch
1. Description
The integrated circuit, T2117, is designed as a zero-voltage switch in bipolar technol-
ogy. It is used to control resistive loads at mains by a triac in zero-crossing mode. A
ramp generator allows power control function by period group control, whereas
full-wave logic guarantees that full mains cycles are used for load switching.
Zero-voltage
Switch with
Adjustable
Ramp
T2117
Rev. 4768B–INDCO–10/05
2
4768B–INDCO–10/05
T2117
Figure 1-1. Block Diagram with Typical Circuit, Period Group Control 0 to 100%
2. Pin Configuration
Figure 2-1. Pinning DIP8/SO8
Ramp
generator
Pulse
amplifier
Comparator
18 kΩ/
2 W
L
Synchronization Supply
Full-wave logic
+
-
Reference voltage
1.4 V
1
3
4
R
4
100 kΩ28 5
C
2
2.2 µF/
10 V
12 kΩ
min
max
100 kΩ
18 kΩ
7
6
220 kΩ
100 Ω
Load
1000 W
V
M
= 230 V~
N
R
2
(250 V~)
MT2
MT1
GND
+
100 µF/
16 V
T2117
-V
S
(R
sync
)
R
1
D
1
C
1
R
3
R
6
R
5
1
2
3
4
8
7
6
5
RAMP
CRAMP
POSIN
NEGIN
VSYNC
GND
OUTPUT
VS
T2117
Table 2-1. Pin Description
Pin Symbol Function
1 RAMP Ramp output
2 CRAMP Ramp capacitor
3 POSIN Non-inverting comparator input
4 NEGIN Inverting comparator input
5 VS Supply voltage
6 OUTPUT Trigger pulse output
7 GND Ground
8 VSYNC Voltage synchronization
3
4768B–INDCO–10/05
T2117
3. General Description
The integrated circuit T2117 is a triac controller for zero-crossing mode. It is designed to control
power in switching resistive loads of mains supplies.
Information regarding synchronous supply is provided at pin 8 via resistor RSync. To avoid a DC
load on the mains, the full-wave logic guarantees that complete mains cycles are used for load
switching.
A fire pulse is released when the inverting input of the comparator is negative (pin 4) with
respect to the non-inverting input (pin 3) and internal reference voltage. A ramp generator with
freely selectable duration can be performed by capacitor C2 at pin 2. The ramp function is used
for open-loop control (Figure 3-2), but also for applications with proportional band regulation
(Figure 10-3 on page 10). Ramp voltage available at capacitor C2 is decoupled across the emit-
ter follower at pin 1. To maintain the lamp flicker specification, the ramp duration is adjusted
according to the controlling load. One can use internal reference voltage for simple applications.
In that case, pin 3 is inactive and connected to pin 7 (GND), see Figure 10-5 on page 12.
Figure 3-1. Pin 1 Internal Network
Figure 3-2. Threshold Voltage of the Ramp at VS = -8.8 V
Ramp
control
1
C
2
2
T2117
-V
S
R
4
V
1
-1.6 V
-7.6 V T
t
Final voltage
Initial voltage
V
max
V
min
4
4768B–INDCO–10/05
T2117
4. Triac Firing Current (Pulse)
This depends on the triac requirement. It can be limited by the gate series resistance which is
calculated as follows:
where:
VG= Gate voltage
IGmax = Maximum gate current
Ip= Average gate current
tp= Firing pulse width
T = Mains period duration
5. Firing Pulse Width tp
This depends on the latching current of the triac and its load current. The firing pulse width is
determined by the zero-crossing detection which can be influenced by the synchronous resis-
tance, Rsync, (see Figure 5-2 on page 5).
where
IL= Latching current of the triac
VM= Mains supply, effective
P = Load power
The total current consumption is influenced by the firing pulse width which can be calculated as
follows:
RGmax
7.5 V VGmax
–
IGmax
------------------------------------ 36 Ω–≈
IP
IGmax
T
--------------tp
×=
tp2
ω
--- arc. sin ILVM
×
P2
-------------------
⎝⎠
⎛⎞
=
Rsync
VM2 sin ωtp
2
----
×
⎝⎠
⎛⎞
0.6 V–
3.5 10-5A×
------------------------------------------------------------------ 49 kΩ–=
5
4768B–INDCO–10/05
T2117
Figure 5-1. Output Pulse Width
Figure 5-2. Synchronization Resistance
0.01
0.10
1.00
10.00
10 100 1000 10000
P (W)
t
p
(ms)
50
100
200
I
L
(mA)
V
Mains
= 230 V ~
0
400
800
1200
1600
2000
0 200 400 600 800 1000 1200 1400
t
p
(µs)
R
sync
(kΩ)
V
Mains
= 230 V ~
6
4768B–INDCO–10/05
T2117
6. Supply Voltage
The T2117 contains a voltage limiting funtion and can be connected with the mains supply via
the diode D1 and the resistor R1. The supply voltage between pin 5 and 7 is limited to a typical
value of 9.5 V.
The series resistance R1 can be calculated as follows (Figure 6-1 on page 6 and Figure 6-2 on
page 7):
Itot = IS + IP + Ix
where
VM= Mains voltage
VS= Limiting voltage of the IC
Itot = Total current consumption
IS= Current requirement of the IC (without load)
Ix= Current requirement of other peripheral components
P(R1) = Power dissipation at R1
Figure 6-1. Maximum Resistance of R1
R1max 0.85VMmin VSmax
–
2 Itot
------------------------------------- ; P(R1)
VMVS
–()
2
2 R1
-----------------------------==
03 6 9 12
0
10
20
30
40
50
R
1
(kΩ)
I
tot
(mA)
15
V
Mains
= 230 V~
7
4768B–INDCO–10/05
T2117
Figure 6-2. Power Dissipation of R1 According to Current Consumption
03 6 9 12
0
I
tot
(mA)
15
1
2
3
4
6
P
R1
(W)
5
V
Mains
= 230 V ~
7. Absolute Maximum Ratings
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating
only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this
specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Parameters Pin Symbol Value Unit
Supply current 5 -IS30 mA
Synchrounous current 8 Isync 5mA
Output current ramp generator 1 IO3mA
Input voltages
1, 3, 4, 6
2
8
-VI
-VI
±VI
≤VS
2 to VS
≤7.3
V
V
V
Power dissipation
Tamb = 45°C
Tamb = 100°C
Ptot
Ptot
400
125
mW
mW
Junction temperature Tj125 °C
Operating ambient
temperature range Tamb 0 to 100 °C
Storage temperature range Tstg -40 to +125 °C
8. Thermal Resistance
Parameters Symbol Value Unit
Junction ambient SO8 RthJA 200 K/W
Junction ambient DIP8 RthJA 110 K/W
8
4768B–INDCO–10/05
T2117
9. Electrical Characteristics
-VS = 8.8 V, Tamb = 25°C, reference point pin 7, unless otherwise specified
Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit
Supply-voltage
limitation
-IS = 1 mA
-IS = 10 mA 5-VS
-VS
9.0
9.1
9.5
9.6
10.0
10.1
V
V
Supply current 5 -IS500 µA
Voltage limitation I8 = ±1 mA 8 ±VI7.7 8.2 8.7 V
Synchronization
current 8±I
sync 0.12 mA
Zero detector 8 ±Isync 35 µA
Output pulse width
VM= 230 V ~
Rsync = 220 kΩ
Rsync = 470 kΩ6
6
tP
tP
260
460
µs
µs
Output pulse current V6 = 0 V 6 -IO100 mA
Comparator
Input offset voltage 3, 4 ±VI0 15 mV
Input bias current 4 IIB 1µA
Common-mode input
voltage 3, 4 -VIC 1(V
S - 1) V
Threshold internal
reference V3 = 0 V 4 -VRef 1.4 V
Ramp Generator, Figure 1-1 on page 2
Period
-IS = 1 mA
Isync = 1 mA
C1 = 100 µF
C2 = 2.2 µF
R4 = 100 kΩ
1T 1.5 s
Final voltage 1 -V11.2 1.6 2.0 V
Initial voltage 1 -V17.2 7.6 8.0 V
Charge current V2 = -VS, I8 = -1 mA 2 -I214 20 26 µA
9
4768B–INDCO–10/05
T2117
10. Applications
Figure 10-1. Power Blinking Switch with f ≈ 2.7 Hz, Duty Cycle 1:1, Power Range 0.5 to 2.2 kW
8765
1234
T2117
270 kΩ
V
M
= 230 V ~
56 Ω
18 kΩ/
1.5 W
L
N
100 nF/
250 V ~
82 Ω
0.5 ...
2.2 kW
110 kΩ150 kΩ
47 µF/ 16V 0.47 µF/
10 V
10
4768B–INDCO–10/05
T2117
Figure 10-2. Power Switch
Figure 10-3. Temperature Control 15°C to 35°C with Sensor Monitoring
R(25) = 100 kΩ/B = 3988 --> R(15) = 159 kΩ, R(35) = 64.5 kΩ, R5(1) determines the proportional range.
8765
1234
T2117
VDR
R
L
270 kΩ
V
M
= 230 V ~
56 Ω
56 kΩ
39 kΩ
47 µF/
10 V I
I
≥ 1.5 mA
18 kΩ
1.5 W
L
N
+5 V
V
I
Load
Ramp
generator
Pulse
amplifier
Comparator
R
1
18 kΩ/
2 W
L
Synchronization Supply
Full-wave logic
+
-
Reference voltage
1.4 V
1
3
4
100 kΩ
2 8 5
2.2 µF/
10 V
150 Ω
7
6
220 kΩ
100 Ω
R
3
Load
1000 W
V
M
= 230 V~
N
(R
sync
)
(250 V~)
100 kΩ
R
8
470 kΩ
100 kΩ
NTC
B value = 3988
130 kΩ220 kΩ
+
T2117
D
1
R
2
C
2
R
7
R
p
R
9
R
(25)
R
6
R
5(1)
R
4
C
1
11
4768B–INDCO–10/05
T2117
Figure 10-4. Room Temperature Control with Definite Reduction (Remote Control) for a Temperature Range of 5 to 30°C
8765
1234
T2117
510 kΩ
V
M
= 230 V ~
62 Ω
L
N
0.35 ...
1.5 kW
910 kΩ
I
H
= 50 mA
Load
9.1 kΩ
220 kΩ
12 kΩ
C
3
10 nF
25 kΩ
R
15
NTC
33 kΩ
12 kΩ
56 kΩ1 µF47 µF
100 µF/
12 V
C
5
2.2 µF
680 kΩ
680 kΩ
13 kΩ/2 W
-∆T
C
4
R
9
R
10
R
8
C
2
C
1
R
7
R
6
R
16
R
3
R
5
R
4
R
2
R
1
12
4768B–INDCO–10/05
T2117
Figure 10-5. Two-point Temperature Control for a Temperature Range of 15°C to 30°C
8765
123
4
T2117
220 kΩ
56 Ω
18 kΩ/
1.5 W
L
N
Load/1000 W
68 µF/
10 V
VDR
10 nF
220 kΩ
500 kΩ
50 kΩ
NTC
V
M
= 230 V ~
(680 kΩ)
(2 MΩ)
(200 kΩ)
13
4768B–INDCO–10/05
T2117
Figure 10-6. Two-point Temperature Control for a Temperature of 18°C to 32°C and a Hysteresis of ±0.5°C at 25°C
8765
1234
T2117
430 kΩ
V
M
= 230 V~
92 Ω
18 kΩ/
1.5 W
L
N
≥ 68 µF/
10 V
Load/400 ΩR
sync
27 kΩ
330 kΩ
8.2 kΩ
C
1
150 nF
50 kΩ
39 kΩ
200 kΩ
NTC
33 µF/
10 V
C
3
C
2
R
7
R
5
R
6
R
4
R
15
D
2
R
1
D
1
R
3
11. Ordering Information
Extended Type Number Package Remarks
T2117-3ASY DIP8 Tube, Pb-free
T2117-TASY SO8 Tube, Pb-free
T2117-TAQY SO8 Taped and reeled, Pb-free
14
4768B–INDCO–10/05
T2117
12. Package Information
9.8
9.5
Package DIP8
Dimensions in mm
1.64
1.44
4.8 max
0.5 min 3.3
0.58
0.48
7.62
2.54
6.4 max
0.36 max
9.8
8.2
7.77
7.47
85
14
technical drawings
according to DIN
specifications
technical drawings
according to DIN
specifications
Package SO8
Dimensions in mm
5.00
4.85
0.4
1.27
3.81
1.4
0.25
0.10
5.2
4.8
3.7
3.8
6.15
5.85
0.2
85
14
15
4768B–INDCO–10/05
T2117
13. Revision History
Please note that the following page numbers referred to in this section refer to the specific revision
mentioned, not to this document.
Revision No. History
4768B-INDCO-08/05
• Put datasheet in a new template
• First page: Pb-free logo added
• Page 13: Ordering Information changed
Printed on recycled paper.
4768B–INDCO–10/05
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