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부품번호 | U2008B 기능 |
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기능 | Low-Cost Phase-Control IC with Soft Start | ||
제조업체 | ATMEL Corporation | ||
로고 | |||
전체 10 페이지수
Low-Cost Phase-Control IC with Soft Start
U2008B
Description
The U2008B is designed as a phase-control circuit in
bipolar technology. It enables load-current detection as
well as mains-compensated phase control. Motor control
with load-current feedback and overload protection are
preferred applications.
Features
D Full wave current sensing
D Mains supply variation compensated
D Variable soft-start or load-current sensing
D Voltage and current synchronization
D Automatic retriggering switchable
D Triggering pulse typ. 125 mA
D Internal supply-voltage monitoring
D Current requirement v 3 mA
Applications
D Low-cost motor control
D Domestic appliance
Block Diagram
230 V ~
Load
Limiting
detector
22 kW/2W BYT51K
R2
330 kW
R1 D1
amax
R8
1 MW
76
Voltage
detector
Mains voltage
compensation
Automatic
retriggering
TIC
226
R3
180W
8
1
Current
detector
Full wave load
current detector
Soft start
R6
^
V(R6)
=
±250
mV
Phase
control unit
ö = f (V3)
U2008B
23
C3
3.3 nF
C4
100 nF
+–
Supply
voltage
limiting
Reference
voltage
Voltage
monitoring
R10 100 kW
Load current
compensation
5 –VS
C1
22 mF/
25 V
4 GND
R14
47 kW
Set point
R7
P1
Figure 1. Block diagram with typical circuit: Load current sensing
Rev. A4, 12-Jan-01
1 (10)
U2008B
Current Synchronization, Pin 8
Mains
Current synchronization fulfils two functions:
* Monitoring the current flow after triggering.
In case the triac extinguishes again or it does not switch
on, automatic triggering is activated as long as
triggering is successful.
* Avoiding triggering due to inductive load.
In the case of inductive load operation, the current
synchronization ensures that in the new half wave no
pulse is enabled as long as there is a current available
from the previous half wave, which flows from the
opposite polarity to the actual supply voltage.
R2
2x
BZX55
C6V2
7
U2008B
4
A special feature of the IC is the realization of current
synchronization. The device evaluates the voltage at the
pulse output between the gate and reference electrode of
the triac. This results in saving separate current
synchronization input with specified series resistance.
Voltage Synchronization with Mains Voltage
Compensation, Pin 7
The voltage detector synchronizes the reference ramp
with the mains supply voltage. At the same time, the
mains-dependent input current at Pin 7 is shaped and rec-
tified internally. This current activates the automatic
retriggering and at the same time is available at Pin 3 (see
figure 9). By suitable dimensioning, it is possible to attain
the specified compensation effect. Automatic
retriggering and mains voltage compensation are not
activated until |V7 – 4| increases to 8 V. The resistance
Rsync. defines the width of the zero voltage cross-over
pulse, synchronization current, and hence the mains sup-
ply voltage compensation current. If the mains voltage
compensation and the automatic retriggering are not
required, both functions can be suppressed by limiting
|V7 – 4| v 7 V (see figure 4).
Figure 4. Suppression of automatic retriggering and mains
voltage compensation
A further feature of the IC is the selection between soft-
start or load-current compensation. Soft start is possible
by connecting a capacitor between Pin 1 and Pin 4, see
figure 8. In the case of load-current compensation, Pin 1
is directly connected with resistance R6, which is used for
sensing load current.
Load Current Detection, Pin 1
The circuit continuously measures the load current as a
voltage drop at resistance R6. The evaluation and use of
both half waves results in a quick reaction to load-current
change. Due to voltage at resistance R6, there is an
increase of input current at Pin 1. This current increase
controls the internal current source, whose positive
current values is available at Pin 3 (see figure 11). The
output current generated at Pin 3 contains the difference
from the load-current detection and from the
mains-voltage compensation (see figure 9).
The effective control voltage is the final current at Pin 3
together with the desired value network. An increase of
mains voltage causes the increase of control angle α. An
increase of load current results in a decrease in the control
angle. This avoids a decrease in revolution by increasing
the load as well as the increase of revolution by the
increment of mains supply voltage.
4 (10)
Rev. A4, 12-Jan-01
4페이지 250
200 33 nF
6.8 nF
10 nF 4.7 nF 3.3 nF
150
2.2 nF
100 Cö/ t = 1.5 nF
50
0
0
120
100
80
60
40
20
0
0
200 400 600 800 1000
Rö (R8) ( kW )
Figure 5. Ramp control
VGT=–1.2V
200 400 600 800 1000
RGT ( W )
Figure 6. Pulse output
400
Dtp/DCö=9ms/nF
300
200
100
0
0 10 20
Cö = ( nF )
Figure 7. Output-pulse width
30
Rev. A4, 12-Jan-01
U2008B
1
0
–1
–2
–3
–4
–5
0
C5=1mF
10mF
4.7mF
Supply
R1=22kW/2W
C1=100mF/25V
1 2 3 45
t(s)
Figure 8. Option soft start
0
40
80
120
160 Pins 1
Vs=–13V
200
–2
–1
Reference Point
Pin 10
01
I7 ( mA )
2
Figure 9. Mains voltage compensation
100
Max. Series Resistance
VM=230V
80
60
40
20
0
02
46
IS ( mA )
8 10
Figure 10. Maximum resistance of R1
7 (10)
7페이지 | |||
구 성 | 총 10 페이지수 | ||
다운로드 | [ U2008B.PDF 데이터시트 ] |
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구매 문의 | 일반 IC 문의 : 샘플 및 소량 구매 ----------------------------------------------------------------------- IGBT, TR 모듈, SCR 및 다이오드 모듈을 포함한 광범위한 전력 반도체를 판매합니다. 전력 반도체 전문업체 상호 : 아이지 인터내셔날 사이트 방문 : [ 홈페이지 ] [ 블로그 1 ] [ 블로그 2 ] |
부품번호 | 상세설명 및 기능 | 제조사 |
U2008B | Low Cost Current Feedback Phase Control Circuit | TEMIC Semiconductors |
U2008B | Low-Cost Phase-Control IC with Soft Start | ATMEL Corporation |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |