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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
Zero-voltage Switch with Adjustable Ramp T2117
1. Description
The integrated circuit, T2117, is designed as a zero-voltage switch in bipolar technology. 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.
Rev. 4768B-INDCO-10/05
Figure 1-1.
Block Diagram with Typical Circuit, Period Group Control 0 to 100%
D1 220 k (250 V~) R2 (Rsync) R1 18 k/ 2W -VS C2 2.2 F/ 10 V R5 12 k max 100 k min R6 18 k N Reference voltage 1.4 V 3 4 + + 6 Full-wave logic Comparator Pulse amplifier R3 R4 100 k 1 Ramp generator 7 Synchronization Supply GND 100 2 8 5 C1 100 F/ 16 V VM = 230 V~ MT2 MT1 Load 1000 W L
T2117
2. Pin Configuration
Figure 2-1. Pinning DIP8/SO8
RAMP CRAMP 1 8 VSYNC
2 T2117
7
GND OUTPUT
POSIN
3
6
NEGIN
4
5
VS
Table 2-1.
Pin 1 2 3 4 5 6 7 8
Pin Description
Symbol RAMP CRAMP POSIN NEGIN VS OUTPUT GND VSYNC Function Ramp output Ramp capacitor Non-inverting comparator input Inverting comparator input Supply voltage Trigger pulse output Ground Voltage synchronization
2
T2117
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 emitter 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
T2117
1 R4 -VS
Ramp control
2
C2
Figure 3-2.
Threshold Voltage of the Ramp at VS = -8.8 V
t V1 -1.6 V Final voltage Vmin Initial voltage Vmax
-7.6 V
T
3
4768B-INDCO-10/05
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:
7.5 V - V Gmax R Gmax ----------------------------------- - 36 I Gmax I Gmax I P = ------------- x t p T
where: VG = Gate voltage
IGmax = Maximum gate current Ip tp T = Average gate current = Firing pulse width = 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 resistance, Rsync, (see Figure 5-2 on page 5).
IL x VM 2 t p = -- arc. sin ------------------- P2
where IL VM P = Latching current of the triac = Mains supply, effective = Load power
The total current consumption is influenced by the firing pulse width which can be calculated as follows:
tp V M 2 sin x --- - 0.6 V 2 = ----------------------------------------------------------------- - 49 k -5 3.5 x 10 A
R sync
4
T2117
4768B-INDCO-10/05
T2117
Figure 5-1. Output Pulse Width
10.00 VMains = 230 V ~
tp (ms)
1.00
0.10
IL (mA) 200 100
0.01 10 100
50
P (W)
1000
10000
Figure 5-2.
Synchronization Resistance
2000 VMains = 230 V ~ 1600
Rsync (k)
1200
800
400
0 0 200 400 600 800 1000 1200 1400
tp (s)
5
4768B-INDCO-10/05
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):
2 V Mmin - V Smax ( VM - VS ) R 1max = 0.85 ------------------------------------- ; P (R1) = ---------------------------2 I tot 2 R1
Itot
= IS + IP + Ix
where VM VS Itot IS Ix = Mains voltage = Limiting voltage of the IC = Total current consumption = Current requirement of the IC (without load) = Current requirement of other peripheral components
P(R1) = Power dissipation at R1
Figure 6-1.
Maximum Resistance of R1
50
40
R1 (k)
VMains = 230 V~
30
20
10
0 0 3 6 9 Itot (mA) 12 15
6
T2117
4768B-INDCO-10/05
T2117
Figure 6-2. Power Dissipation of R1 According to Current Consumption
6 5 4
PR1 (W)
VMains = 230 V ~
3 2 1 0 0 3 6 9 Itot (mA) 12 15
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 Supply current Synchrounous current Output current ramp generator Input voltages Power dissipation Tamb = 45 C Tamb = 100 C Junction temperature Operating ambient temperature range Storage temperature range Pin 5 8 1 1, 3, 4, 6 2 8 Symbol -IS Isync IO -VI -VI VI Ptot Ptot Tj Tamb Tstg Value 30 5 3 S V 2 to VS 7.3 400 125 125 0 to 100 -40 to +125 Unit mA mA mA V V V mW mW C C C
8. Thermal Resistance
Parameters Junction ambient SO8 Junction ambient DIP8 Symbol RthJA RthJA Value 200 110 Unit K/W K/W
7
4768B-INDCO-10/05
9. Electrical Characteristics
-VS = 8.8 V, Tamb = 25 C, reference point pin 7, unless otherwise specified
Parameters Supply-voltage limitation Supply current Voltage limitation Synchronization current Zero detector Output pulse width Output pulse current Comparator Input offset voltage Input bias current Common-mode input voltage Threshold internal reference V3 = 0 V 3, 4 4 3, 4 4 VI0 IIB -VIC -VRef 1 1.4 15 1 (VS - 1) mV A V V VM= 230 V ~ Rsync = 220 k Rsync = 470 k V6 = 0 V I8 = 1 mA Test Conditions -IS = 1 mA -IS = 10 mA Pin 5 5 8 8 8 6 6 6 Symbol -VS -VS -IS VI Isync Isync tP tP -IO 100 7.7 0.12 35 260 460 8.2 Min. 9.0 9.1 Typ. 9.5 9.6 Max. 10.0 10.1 500 8.7 Unit V V A V mA A s s mA
Ramp Generator, Figure 1-1 on page 2 -IS = 1 mA Isync = 1 mA C1 = 100 F C2 = 2.2 F R4 = 100 k
Period
1
T
1.5
s
Final voltage Initial voltage Charge current V2 = -VS, I8 = -1 mA
1 1 2
-V1 -V1 -I2
1.2 7.2 14
1.6 7.6 20
2.0 8.0 26
V V A
8
T2117
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
L 0.5 ... 2.2 kW 100 nF/ 250 V ~
270 k
VM = 230 V ~
18 k/ 1.5 W 56
N
82
8
7
6
5
T2117
1 150 k
2
3
4 110 k 0.47 F/ 10 V
47 F/ 16V
9
4768B-INDCO-10/05
Figure 10-2. Power Switch
L RL Load VM = 230 V ~ 56 N VDR +5 V 8 7 6 5 18 k 1.5 W 270 k
T2117
1 2 3 4 56 k
47 F/ 10 V
39 k
II 1.5 mA VI
Figure 10-3. Temperature Control 15 C to 35 C with Sensor Monitoring
L 18 k/ 2W Load 1000 W
2.2 F/ 10 V
C2
D1
220 k
(250 V~)
R2 (Rsync)
R1
R8 470 k
R4
100 k
2 1 Ramp generator
8 Synchronization
5 7 Supply
C1 VM = 230 V~
NTC B value = 3988
R(25)
100 k
R6
100 k
R5(1) 3 4 + + 6 Full-wave logic Comparator Pulse amplifier R3
100
R9
150
Rp
220 k
R7
130 k
Reference voltage 1.4 V
T2117
N
R(25) = 100 k/B = 3988 --> R(15) = 159 k, R(35) = 64.5 k, R5(1) determines the proportional range.
10
T2117
4768B-INDCO-10/05
T2117
Figure 10-4. Room Temperature Control with Definite Reduction (Remote Control) for a Temperature Range of 5 to 30C
L 0.35 ... 1.5 kW R1 510 k R5 R2 R3 IH = 50 mA N R16 220 k 62 680 k 13 k/2 W -T R4 680 k
Load VM = 230 V ~
8
7
6
5
T2117
R6 9.1 k R7
1 R10 910 k R9 12 k C5 100 F/ C4 12 V 47 F
2
3 C3
4
12 k R15 25 k
10 nF NTC 33 k R8 56 k C2 1 F
C1 2.2 F
11
4768B-INDCO-10/05
Figure 10-5. Two-point Temperature Control for a Temperature Range of 15 C to 30 C
L
Load/1000 W VM = 230 V ~
220 k
18 k/ 1.5 W VDR N 56
8
7
6
5 220 k (680 k)
T2117
1
2
3
4
500 k (2 M)
10 nF 68 F/ 10 V
50 k (200 k)
NTC
12
T2117
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
L D1 Load/400 VM = 230 V~ R1 92 N R3 8 7 6 5 NTC 18 k/ 1.5 W Rsync 430 k
200 k
T2117
D2
1
2
3
4 R6 27 k R15 50 k
330 k R5 R7 8.2 k C3 33 F/ 10 V C1 68 F/ 10 V C2 150 nF
R4 39 k
11. Ordering Information
Extended Type Number T2117-3ASY T2117-TASY T2117-TAQY Package DIP8 SO8 SO8 Remarks Tube, Pb-free Tube, Pb-free Taped and reeled, Pb-free
13
4768B-INDCO-10/05
12. Package Information
P a c k a g e D IP 8
D im e n s io n s in m m
9 .8 9 .5 1 .6 4 1 .4 4 7 .7 7 7 .4 7
4 .8 m a x 6 .4 m a x 0 .5 m in 0 .5 8 0 .4 8 7 .6 2 8 5 2 .5 4 3 .3 0 .3 6 m a x 9 .8 8 .2
te c h n ic a l d ra w in g s a c c o rd in g to D IN s p e c ific a tio n s
1
4
Package SO8
Dimensions in mm
5.00 4.85 1.4 0.4 1.27 3.81 8 5 0.25 0.10
5.2 4.8 3.7
0.2 3.8 6.15 5.85
technical drawings according to DIN specifications
1
4
14
T2117
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. 4768B-INDCO-08/05 History * Put datasheet in a new template * First page: Pb-free logo added * Page 13: Ordering Information changed
15
4768B-INDCO-10/05
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4768B-INDCO-10/05

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