U2008B-A [ATMEL]
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| 型号： | U2008B-A |
| 厂家： | 
ATMEL |
| 描述： | 暂无描述 软启动 |
| 文件： | 总13页 (文件大小：341K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Features
• Full Wave Current Sensing
• Compensated Mains Supply Variations
• Variable Soft Start or Load-current Sensing
• Voltage and Current Synchronization
• Switchable Automatic Retriggering
• Triggering Pulse Typically 125 mA
• Internal Supply-voltage Monitoring
• Current Requirement ≤ 3 mA
Low-cost
Phase-control
IC with Soft
Start
Applications
• Low-cost Motor Control
• Domestic Appliance
1. 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.
U2008B
Figure 1-1. Block Diagram with Typical Circuit: Load Current Sensing
22 kΩ/2W
BYT51K
230 V ~
R1
D1
αmax
R8
R2
330 kΩ
1 MΩ
Load
7
6
Limiting
detector
Voltage
detector
Mains voltage
compensation
Automatic
retriggering
U2008B
Phase
control unit
-VS
5
4
Current
detector
TIC
226
ϕ = f(V3)
C1
22 µF/
R3
Supply
voltage
limiting
8
1
25 V
GND
180Ω
Reference
voltage
-
Full wave load
current
detector
+
Voltage
monitoring
R14
Soft start
47 kΩ
2
3
R10
Set point
R7
100 kΩ
P1
^
R6
V(R6) = ±250 mV
C4
C3
Load current
compensation
3.3 nF
100 nF
4712C–AUTO–07/07
Figure 1-2. Block Diagram with Typical Circuit: Soft Start
BYT51K
R8
230 V ~
22 kΩ/2W
L
R1
D1
R2
α
max
680 kΩ
470 kΩ
Load
7
6
Limiting
detector
Voltage
detector
Mains voltage
compensation
Automatic
retriggering
U2008B
Phase
-VS
5
4
control unit
Current
detector
TIC
226
ϕ = f(V3)
C1
100 µF
25V
R3
180Ω
Supply
voltage
limiting
8
1
GND
Reference
voltage
-
Full wave load
current detector
+
Voltage
monitoring
Soft start
2
3
P1
R10
Set point
68 kΩ
C5
Soft start
50 kΩ
4.7 µF/25V
C3
C4
R7
220 kΩ
10 nF
100 nF
N
2
U2008B
4712C–AUTO–07/07
U2008B
2. Pin Configuration
Figure 2-1. Pinning
1
2
3
4
8
7
6
5
OUTPUT
ISENSE
VSYNC
Cϕ
U2008B
Rϕ
CONTROL
-VS
GND
Table 2-1.
Pin Description
Pin
1
Symbol
ISENSE
Cϕ
Function
Load current sensing
Ramp voltage
2
3
CONTROL Control input/compensation output
4
GND
-VS
Ground
5
Supply voltage
6
Rϕ
Ramp current adjustment
Voltage synchronization
Trigger output
7
VSYNC
OUTPUT
8
2.1
Mains Supply, Pin 5
The integrated circuit U2008B, which also contains voltage limiting, can be connected via D1 and
R1 to the mains supply, see Figure 1-2 on page 2. Supply voltage, between Pin 4 (pos., ⊥) and
Pin 5, is smoothed by C1.
The series resistance R1 can be calculated as follows:
V
M – VSmax
-----------------------------
R1max = 0.85 ×
2 × Itot
where:
VM
= Mains voltage
VSmax
Itot
ISmax
Ix
= Maximum supply voltage
= ISmax + Ix = Total current compensation
= Maximum current consumption of the IC
= Current consumption of the external components
Operation with externally stabilized DC voltage is not recommended.
3
4712C–AUTO–07/07
2.2
2.3
Voltage Monitoring
When the voltage is built up, uncontrolled output pulses are avoided by internal voltage monitor-
ing. Apart from that, all latches of the circuit (phase control, load limit regulation) are reset and
the soft start capacitor is short circuited. This guarantees a specified start-up behavior each time
the supply voltage is switched on or after short interruptions of the mains supply. Soft start is ini-
tiated after the supply voltage has been built up. This behavior guarantees a gentle start-up for
the motor and automatically ensures the optimum run-up time.
Phase Control, Pin 6
The function of the phase control is identical to that of the well-known IC U211B. The phase
angle of the trigger pulse is derived by comparing the ramp voltage V2 at Pin 2 with the set value
on the control input, Pin 3. The slope of the ramp is determined by C3 and its charging current I
ϕ.
The charging current can be regulated, changed or altered using R8 at Pin 6.
The maximum phase angle, αmax, (minimum current flow angle ϕmin) can also be adjusted by
using R8 (see Figure 5-1 on page 7).
When the potential on Pin 2 reaches the set point level of Pin 3, a trigger pulse is generated
whose pulse width, tp, is determined from the value of C3 (tp = 9 µs/nF, Figure 5-3 on page 8). At
the same time, a latch is set with the output pulse, as long as the automatic retriggering has not
been activated, then no more pulses can be generated in that half cycle. Control input at Pin 3
(with respect to Pin 4) has an active range from -9 V to -2 V. When V3 = -9 V the phase angle is
at its maximum amax, i.e., the current flow angle is minimum. The minimum phase angle amin is
set with V3 ≥ -1 V.
2.4
Automatic Retriggering
The current-detector circuit monitors the state of the triac after triggering by measuring the volt-
age drop at the triac gate. A current flow through the triac is recognized when the voltage drop
exceeds a threshold level of typically 40 mV.
If the triac is quenched within the relevant half wave after triggering (for example owing to low
load currents before or after the zero crossing of current wave, or for commutator motors, owing
to brush lifters), the automatic retriggering circuit ensures immediate retriggering, if necessary
with a high repetition rate, tpp/tp, until the triac remains reliably triggered.
2.5
Current Synchronization, Pin 8
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.
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 the separate current synchronization input with specified series resistance.
4
U2008B
4712C–AUTO–07/07
U2008B
2.6
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 rectified internally. This
current activates automatic retriggering and at the same time is available at Pin 3 (Figure 5-5 on
page 9). By suitable dimensioning, it is possible to attain the specified compensation effect.
Automatic retriggering and mains voltage compensation are not activated until ⏐V7 - V4⏐
increases to 8 V. The resistance Rsync. defines the width of the zero voltage cross-over pulse,
synchronization current, and hence the mains supply voltage compensation current. If the mains
voltage compensation and the automatic retriggering are not required, both functions can be
suppressed by limiting ⏐V7 - V4⏐ ≤ 7 V (see Figure 2-2).
Figure 2-2. Suppression of Automatic Retriggering and Mains Voltage Compensation
Mains
R2
7
2x
U2008B
BZX55
C6V2
4
A further feature of the IC is the selection between soft start and load-current compensation.
Soft start is possible by connecting a capacitor between Pin 1 and Pin 4 (Figure 5-4 on page 8).
In the case of load-current compensation, Pin 1 is directly connected with resistance R6, which is
used for sensing load current.
2.7
Load Current Detection, Pin 1
The circuit continuously measures the load current as a voltage drop at resistor R6. The evalua-
tion and use of both half waves results in a quick reaction to load-current change. Due to voltage
at resistor R6, there is an increase of input current at Pin 1. This current increase controls the
internal current source, whose positive current values are available at Pin 3 (see Figure 5-7 on
page 9). The output current generated at Pin 3 contains the difference from the load-current
detection and the mains-voltage compensation (see Figure 5-5 on page 9).
The effective control voltage is the final current at Pin 3 together with the desired value network.
An increase of mains voltage causes an increase of the control angle α. An increase of load cur-
rent results in a decrease of the control angle. This avoids a decrease in revolution by increasing
the load as well as an increase of revolution by the increment of mains supply voltage.
5
4712C–AUTO–07/07
3. Absolute Maximum Ratings
VS = 14 V, reference point Pin 4, unless otherwise specified
Parameters
Symbol
-IS
Value
30
Unit
mA
mA
Current limitation Pin 5
t ≤ 10 µs
-iS
100
Synchronous currents Pin 7
t ≤ 10 µs
±IsyncV
±isyncV
5
20
mA
mA
Phase Control Pin 3
Control voltage
-VI
±II
VS to 0
500
V
Input current
mA
mA
Charge current Pin 6
Load Current Monitoring/Soft Start, Pin 1
Input current
-Iϕmax
0.5
II
1
mA
V
Input voltage
VI
-VS to +2
Pulse output
+VI
-VI
2
VS
V
V
Input voltage Pin 8
Storage temperature range
Junction temperature range
Tstg
Tj
-40 to +125
-10 to +125
°C
°C
4. Thermal Resistance
Parameters
Symbol
RthJA
Value
110
Unit
K/W
K/W
K/W
DIP8
Junction ambient
SO8 on p.c.
RthJA
220
So8 on ceramic
RthJA
140
5. Electrical Characteristics
Parameters
Test Conditions
Symbol
Min.
Typ.
Max.
Unit
Supply (Pin 5)
-IS = 3.5 mA
-IS = 30 mA
-VS
-VS
14.5
14.6
16.5
16.8
V
V
Supply-voltage limitation
Current requirement
Voltage Monitoring (Pin 5)
Turn-on threshold
Pins 1, 4 and 7 open
-IS
3.0
mA
-VTON
11.3
12.3
V
Phase Control
Voltage sync. Pin 7
Current sync. Pin 8
±IsyncV
±IsyncI
0.15
8.5
2
30
mA
µA
Input current
3
Voltage limitation
±IL = 2 mA Pin 7
±VsyncV
8.0
9.0
V
Reference Ramp (see Figure 5-1 on page 7)
Charge current
Start voltage
Pin 7
Pin 2
Iϕ
1
100
µA
V
-Vmax
1.85
1.95
2.05
6
U2008B
4712C–AUTO–07/07
U2008B
5. Electrical Characteristics (Continued)
Parameters
Test Conditions
Symbol
-TCR
Min.
Typ.
-0.003
1.02
Max.
Unit
%/K
V
Temperature coefficient of start
voltage
Pin 2
Rϕ - reference voltage
Iϕ = 10 µA, Pins 6 to 5
VRϕ
0.96
1.10
150
Iϕ = 10 µA, Pin 6
Iϕ = 1 µA
TCVRϕ
TCVRϕ
0.03
0.06
%/K
%/K
Temperature coefficient
Pulse Output (see Figure 5-2 on page 8) (Pin 8)
Output-pulse current
Output-pulse width
V8 = -1.2, RGT = 0 Ω
I0
tp
100
125
30
mA
µs
C3 = 3.3 nF, VS = Vlimit
Automatic Retriggering (Pin 8)
Turn-on threshold voltage
Repetition rate
±VION
tpp
20
3
60
mV
tp
I7 ≥ 150 µA
5
7.5
Soft Start (see Figure 5-4 on page 8) (Pin 1)
Starting current
Final current
V1–4 = 8 V
I0
I0
5
10
25
15
40
µA
µA
V1–4 = -2 V
15
0.5
0.2
Discharge current
Output current
-I0
-I0
mA
mA
Pin 3
2
Mains Voltage Compensation (see Figure 5-5 on page 9)
Pins 7, Pin 3
Current transfer gain I7/I3
Gi
14
17
20
2
Pins 1 and 2 open
Reverse current
V(R6) = V3 = V7 = 0, Pin 3
±IR
µA
Load-current Detection, V7 = 0 (see Figure 5-7 on page 9)
Transfer gain
I3/V1
G
I0
0.28
0
0.32
3
0.37
6
µA/mV
µA
Offset current
Input voltage
V1 = 0, V3 = -8 V, Pin 3
Pin 1
Pin 1
-VI
±V0
300
400
6
mV
Input offset voltage
mV
Figure 5-1. Ramp Control
250
200
6.8 nF 4.7 nF
3.3 nF
33 nF 10 nF
2.2 nF
150
100
50
Cϕ/t = 1.5 nF
0
0
200
400
600
800
1000
Rϕ(R8) (kΩ)
7
4712C–AUTO–07/07
Figure 5-2. Pulse Output
120
100
VGT = -1.2 V
80
60
40
20
0
1000
0
200
400
600
RGT (Ω)
800
Figure 5-3. Output Pulse Width
400
∆tp/∆Cϕ = 9 µs/nF
300
200
100
0
0
10
20
30
Cϕ (nF)
Figure 5-4. Option Soft Start
1
C
= 1 µF
5
0
-1
-2
-3
10 µF
Supply
R
= 22 kΩ/2W
1
C1 = 100 µF/25V
4.7 µF
2
-4
-5
5
0
1
3
4
t (s)
8
U2008B
4712C–AUTO–07/07
U2008B
Figure 5-5. Mains Voltage Compensation
0
-40
-80
-120
-160
Reference Point
Pin 4
Pin 1 open
VS = -13 V
-200
-2
-1
0
1
2
I7 (mA)
Figure 5-6. Maximum Resistance of R1
100
Max. Series Resistance
VM = 230 V
80
60
40
20
0
1
0
0
2
4
6
8
IS (mA)
Figure 5-7. Load-current Detection
200
V7 = V4 = 0V
Reference Point
Pin 4
VS = -13 V
160
120
80
40
0
-400
-200
0
200
400
V(R6) (mV)
9
4712C–AUTO–07/07
Figure 5-8. Power Dissipation of R1
10
Power Dissipation at Series Resistance R1
8
6
4
2
0
50
0
10
20
30
R1 (kΩ)
40
Figure 5-9. Power Dissipation of R1 According to Current Consumption
10
Power Dissipation at Series Resistance
8
6
4
2
0
0
3
6
9
12
15
IS (mA)
10
U2008B
4712C–AUTO–07/07
U2008B
6. Ordering Information
Extended Type Number
Package
DIP8
Remarks
U2008B-xY
Tube, Pb-free
U2008B-xFPY
SO8
Tube, Pb-free
U2008B-xFPG3Y
SO8
Taped and reeled, Pb-free
7. Package Information
Package: DIP8
Dimensions in mm
9.8 max.
9.6±0.1
7.62±0.15
0.3 B
A
1.2±0.3
0.53±0.05
6.3±0.1
0.4 A
2.54 nom.
B
8.75±0.8
3 x 2.54 = 7.62 nom.
1.54
0.65
5
8
1
technical drawings
according to DIN
specifications
4
Drawing-No.: 6.543-5040.01-4
Issue: 1; 16.01.02
11
4712C–AUTO–07/07
Package: SO 8
Dimensions in mm
5±0.2
4.9±0.1
3.7±0.1
3.8±0.1
6±0.2
0.4
1.27
3.81
8
5
technical drawings
according to DIN
specifications
1
4
Drawing-No.: 6.541-5031.01-4
Issue: 1; 15.08.06
8. Revision History
Please note that the following page numbers referred to in this section refer to the specific revision
mentioned, not to this document.
Revision No.
History
• Put datasheet in a new template
• Pb-free logo on page 1 deleted
• Figure 5-5 “Mains Voltage Compensation” on page 9 changed
• Figure 5-7 “Load-current Detection” on page 9 changed
4712C-AUTO-07/07
• Put datasheet in a new template
• First page: Pb-free logo added
4712B-AUTO-08/05
• Page 11: Ordering Information changed
12
U2008B
4712C–AUTO–07/07
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www.atmel.com
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4712C–AUTO–07/07
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