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參數(shù)資料
| 型號(hào)： | T2117 |
| 廠商： | Atmel Corp. |
| 英文描述： | Zero-Voltage Switch with Adjustable Ramp |
| 中文描述： | 零電壓開(kāi)關(guān)可調(diào)斜 |
| 文件頁(yè)數(shù)： | 2/11頁(yè) |
| 文件大?。?/td> | 80K |
| 代理商： | T2117 |
T2117
Rev. A2, 17-Dec-01
2 (11)
Pin Description
1
2
3
4
8
7
6
5
Ramp
C
Ramp
POSIN
NEGIN
V
sync
GND
Output
V
S
T2117
Figure 2. Pinning
Pin
Symbol
Function
1
Ramp
Ramp output
2
C
Ramp
POSIN
Ramp capacitor
3
Non-inverting comparator input
4
NEGIN
Inverting comparator input
5
V
S
Supply voltage
6
Output
Trigger pulse output
7
GND
Ground
8
V
sync
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 R
Sync
. 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 C
2
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 C
2
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
C
2
–V
S
2
T2117
R
4
Figure 3. Pin 1 internal network
V
1
–1.6 V
–7.6 V
T
V
min
t
Final voltage
Initial voltage
V
max
Figure 4. Threshold voltage of the ramp at V
S
= –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:
R
Gmax
7.5 V – V
Gmax
I
Gmax
– 36
I
P
=
I
Gmax
T
t
p
where:
V
G
I
Gmax
= Maximum gate current
I
p
= Average gate current
t
p
= Firing pulse width
T
= Mains period duration
Firing Pulse Width t
p
(Figure 5)
= Gate voltage
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, R
sync
, (figure 6).
t
p
=
2
arc. sin
I
L
V
M
P 2
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| T2117-TAQ | 功能描述:IC SWITCH 0-VOLT ADJ RAMP 8-SOIC RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 電源分配開(kāi)關(guān) 系列:- 特色產(chǎn)品:XRP252 Switches 標(biāo)準(zhǔn)包裝:1 系列:- 類(lèi)型:高端開(kāi)關(guān) 輸出數(shù):2 Rds（開(kāi)）:140 毫歐 內(nèi)部開(kāi)關(guān):是 電流限制:1.15A 輸入電壓:1.75 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:10-WFDFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:10-TDFN（3x3） 包裝:Digi-Reel® 其它名稱(chēng):1016-1691-6 |
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