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T2117 डेटा पत्रक PDF( Datasheet डाउनलोड )


डेटा पत्रक - Zero-Voltage Switch with Adjustable Ramp - ATMEL Corporation

भाग संख्या T2117
समारोह Zero-Voltage Switch with Adjustable Ramp
मैन्युफैक्चरर्स ATMEL Corporation 
लोगो ATMEL Corporation लोगो 
पूर्व दर्शन
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T2117 pdf
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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

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