T2117-TAS Atmel, T2117-TAS Datasheet - Page 3

• Manufacturer Part Number: T2117-TAS
• Description: IC SWITCH 0-VOLT ADJ RAMP 8-SOIC
• Manufacturer: Atmel
• Type: Triac Controllerr

Specifications of T2117-TAS

• Number Of Outputs: 1
• Internal Switch(s): No
• Current Limit: 100mA
• Voltage - Input: 230V
• Operating Temperature: 0°C ~ 100°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Rds (on): -

3. General Description
4768B–INDCO–10/05
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 R
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 C
for open-loop control
(Figure 10-3 on page
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 3-1.
Figure 3-2.
Pin 1 Internal Network
Threshold Voltage of the Ramp at V
10). Ramp voltage available at capacitor C
(Figure
-1.6 V
-7.6 V
V
1
R
3-2), but also for applications with proportional band regulation
4
1
-V
S
T
2
S
= -8.8 V
t
C
2
T2117
control
Ramp
2
Final voltage
Initial voltage
V
V
at pin 2. The ramp function is used
max
min
2
Figure 10-5 on page
is decoupled across the emit-
Sync
. To avoid a DC
T2117
12.
3