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Atmel Electronic Components Datasheet

T2117 Datasheet

Zero-Voltage Switch

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Zero-Voltage Switch with Adjustable Ramp
T2117
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.
Features
D Direct supply from the mains
D Current consumption 0.5 mA
D Very few external components
D Full-wave drive – no DC current component in the
load circuit
D Negative output current pulse typ. 100 mA –
short-circuit protected
D Simple power control
D Ramp generator
D Reference voltage
Applications
D Full-wave power control
D Temperature regulation
D Power blinking switch
Block Diagram
C2
2.2 mF/
10 V
R4
100 kW
R5
12 kW
max
100 kW
min
R6
18 kW
D1 BYT41M
L
220 kW
(250 V~)
R2
(Rsync)
18 kW/
R1 2 W
Load
1000 W
DataSheet4U.com
–VS
2 8 5 C1
1 Ramp
generator
Synchronization
Supply
7
GND
100 mF/
16 V
TIC
236N
VM =
230 V~
MT2
3
+
4+
Full-wave logic
Comparator
6
Pulse
amplifier
100 W
R3
MT1
Reference voltage
1.4 V
T2117
N
DataShee
Figure 1. Block diagram with typical circuit, period group control 0 to 100%
Ordering Information
Extended Type Number
T2117-3AS
T2117-TAS
T2117-TAQ
Package
DIP8
SO8
SO8
Remarks
Tube
Tube
Taped and reeled
Rev. A2, 17-Dec-01
DataSheet4U.com
1 (11)
DataSheet4 U .com


Atmel Electronic Components Datasheet

T2117 Datasheet

Zero-Voltage Switch

No Preview Available !

www.DataSheet4U.com
T2117
Pin Description
Ramp 1
8 Vsync
T2117
CRamp 2
POSIN 3
T2117
NEGIN 4
7 GND
6 Output
5 VS
Ramp
1 control
R4 2 C2
–VS
Figure 2. Pinning
Figure 3. Pin 1 internal network
et4U.com
Pin Symbol
Function
1 Ramp Ramp output
2 CRamp Ramp capacitor
3 POSIN Non-inverting comparator input
4 NEGIN Inverting comparator input
V1
–1.6 V
t
Final voltage
Vmin
5 VS Supply voltage
6 Output Trigger pulse output
–7.6 V
Initial voltage
T Vmax
7 GND Ground
8 Vsync Voltage synchronization
General Description
Figure 4. Threshold voltage of the ramp at VS = –8.8 V
DataSheeTt4rUia.ccomFiring Current (Pulse)
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 supply sync. is provided at Pin 8
via resistor RSync. To avoid DC load on the mains, the full-
wave logic guarantees that complete mains cycles are
used for load switching.
This depends on the triac requirement. It can be limited
with gate series resistance which is calculated as follows:
RGmax 
7.5 V – VGmax
IGmax
– 36 W
IP = IGmax
T
tp
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 free selectable duration can be
performed by capacitor C2 at Pin 2. The ramp function is
used for open-loop control (figure 4), but also for applica-
tion with proportional band regulation (figure 11). Ramp
voltage available at capacitor C2 is decoupled across the
emitter follower at Pin l. To maintain the lamp flicker
specification, ramp duration is adjusted according to the
controlling load. In practice, interference should be
avoided (temperature control). Therefore, a two-point
control is preferred to proportional control. One can use
internal reference voltage for simple applications. In that
case, Pin 3 is inactive and connected to Pin 7 (GND), see
figure 13.
where:
VG = Gate voltage
IGmax = Maximum gate current
Ip = Average gate current
tp = Firing pulse width
T = Mains period duration
Firing Pulse Width tp (Figure 5)
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 with the
help of sync. resistance, Rsync, (figure 6).
tp =
2
arc. sin
IL
VM
w P Ǹ2
DataShee
2 (11)
DataSheet4U.com
Rev. A2, 17-Dec-01
DataShee4t U .com


Part Number T2117
Description Zero-Voltage Switch
Maker ATMEL Corporation
PDF Download

T2117 Datasheet PDF






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