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参数资料
| 型号： | T2117-TA |
| 厂商： | ATMEL CORP |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO8 |
| 封装： | SO-8 |
| 文件页数： | 4/11页 |
| 文件大小： | 71K |
| 代理商： | T2117-TA |
T2117
Rev. A1, 28-Sep-00
2 (11)
Pin Description
1
2
3
4
8
7
6
5
Ramp
CRamp
POSIN
NEGIN
Vsync
GND
Output
VS
T2117
Figure 2. Pinning
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
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 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.
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.
Ramp
control
1
C2
–VS
2
T2117
R4
Figure 3. Pin 1 internal network
V1
–1.6 V
–7.6 V
T
Vmin
t
Final voltage
Initial voltage
Vmax
Figure 4. Threshold voltage of the ramp at VS = –8.8 V
Triac Firing Current (Pulse)
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
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
w
arc. sin
IL
VM
P2
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相关代理商/技术参数 |
参数描述 |
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| T2117-TAQ | 功能描述:IC SWITCH 0-VOLT ADJ RAMP 8-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 电源分配开关 系列:- 特色产品:XRP252 Switches 标准包装:1 系列:- 类型:高端开关 输出数:2 Rds（开）:140 毫欧 内部开关:是 电流限制:1.15A 输入电压:1.75 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:10-WFDFN 裸露焊盘 供应商设备封装:10-TDFN（3x3） 包装:Digi-Reel® 其它名称:1016-1691-6 |
| T2117-TAQY | 功能描述:电源开关 IC - 配电 Zero Cross Switch RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
| T2117-TAS | 功能描述:IC SWITCH 0-VOLT ADJ RAMP 8-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 电源分配开关 系列:- 特色产品:XRP252 Switches 标准包装:1 系列:- 类型:高端开关 输出数:2 Rds（开）:140 毫欧 内部开关:是 电流限制:1.15A 输入电压:1.75 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:10-WFDFN 裸露焊盘 供应商设备封装:10-TDFN（3x3） 包装:Digi-Reel® 其它名称:1016-1691-6 |
| T2117-TASY | 功能描述:电源开关 IC - 配电 Zero Cross Switch RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
| T-2118-SP | 制造商:Molex 功能描述: |
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