ATMEL U2008B-M

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.
Figure 1-1.
Block Diagram with Typical Circuit: Load Current Sensing
22 kΩ/2W
230 V ~
R1
R2
330 kΩ
Load
BYT51K
D1
αmax
7
Limiting
detector
R8
1 MΩ
6
Mains voltage
compensation
Voltage
detector
Automatic
retriggering
U2008B
Phase
control unit
Current
detector
TIC
226
R3
ϕ = f(V3)
C1
Supply
voltage
limiting
8
1
Full wave load
current
detector
+
-
22 µF/
25 V
4
GND
Reference
voltage
Voltage
monitoring
Soft start
2
C3
3.3 nF
R14
47 kΩ
3
R10
^
V(R6) = ±250 mV
-VS
5
180Ω
R6
U2008B
C4
100 nF
100 kΩ
Set point
Load current
compensation
R7
P1
4712C–AUTO–07/07
Figure 1-2.
Block Diagram with Typical Circuit: Soft Start
230 V ~
BYT51K
22 kΩ/2W
L
R1
R2
D1
R8
αmax
680 kΩ
470 kΩ
Load
7
Limiting
detector
6
Voltage
detector
Mains voltage
compensation
Automatic
retriggering
U2008B
Phase
control unit
ϕ = f(V3)
Current
detector
TIC
226
R3
5
C1
Supply
voltage
limiting
8
180Ω
1
Full wave load
current detector
+
-
2
Soft start
4.7 µF/25V
100 µF
25V
4
GND
Reference
voltage
Voltage
monitoring
Soft start
C5
-VS
3
R10
68 kΩ
Set point
P1
50 kΩ
C3
10 nF
C4
100 nF
R7
220 kΩ
N
2
U2008B
4712C–AUTO–07/07
U2008B
2. Pin Configuration
Figure 2-1.
Pinning
ISENSE
Cϕ
1
8
OUTPUT
2
7
VSYNC
U2008B
Table 2-1.
2.1
CONTROL
3
6
Rϕ
GND
4
5
-VS
Pin Description
Pin
Symbol
Function
1
ISENSE
Load current sensing
2
Cϕ
3
CONTROL
4
GND
Ground
5
-VS
Supply voltage
6
Rϕ
Ramp current adjustment
7
VSYNC
8
OUTPUT
Ramp voltage
Control input/compensation output
Voltage synchronization
Trigger output
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 – V Smax
R 1max = 0.85 × -----------------------------2 × I tot
where:
VM
VSmax
Itot
ISmax
Ix
= Mains voltage
= 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.
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4712C–AUTO–07/07
2.2
Voltage Monitoring
When the voltage is built up, uncontrolled output pulses are avoided by internal voltage monitoring. 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 initiated 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.
2.3
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 voltage 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 ⏐V 7 - V 4 ⏐
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
BZX55
C6V2
U2008B
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 evaluation 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 current 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
Value
Unit
-IS
30
mA
Current limitation Pin 5
t ≤ 10 µs
-iS
100
mA
±IsyncV
±isyncV
5
20
mA
mA
-VI
VS to 0
V
±II
500
mA
-Iϕmax
0.5
mA
II
1
mA
VI
-VS to +2
V
Input voltage Pin 8
+VI
-VI
2
VS
V
V
Storage temperature range
Tstg
-40 to +125
°C
Junction temperature range
Tj
-10 to +125
°C
Symbol
Value
Unit
RthJA
110
K/W
SO8 on p.c.
RthJA
220
K/W
So8 on ceramic
RthJA
140
K/W
Synchronous currents Pin 7
t ≤ 10 µs
Phase Control Pin 3
Control voltage
Input current
Charge current Pin 6
Load Current Monitoring/Soft Start, Pin 1
Input current
Input voltage
Pulse output
4. Thermal Resistance
Parameters
DIP8
Junction ambient
5. Electrical Characteristics
Parameters
Test Conditions
Symbol
Min.
14.5
14.6
Typ.
Max.
Unit
16.5
16.8
V
V
3.0
mA
11.3
12.3
V
0.15
2
30
mA
µA
8.5
9.0
V
100
µA
2.05
V
Supply (Pin 5)
Supply-voltage limitation
-IS = 3.5 mA
-IS = 30 mA
-VS
-VS
Current requirement
Pins 1, 4 and 7 open
-IS
Voltage Monitoring (Pin 5)
Turn-on threshold
-VTON
Phase Control
Input current
Voltage sync. Pin 7
Current sync. Pin 8
±IsyncV
±IsyncI
3
Voltage limitation
±IL = 2 mA Pin 7
±VsyncV
8.0
Reference Ramp (see Figure 5-1 on page 7)
Charge current
Pin 7
Iϕ
1
Start voltage
Pin 2
-Vmax
1.85
6
1.95
U2008B
4712C–AUTO–07/07
U2008B
5. Electrical Characteristics (Continued)
Parameters
Test Conditions
Symbol
Temperature coefficient of start
voltage
Pin 2
-TCR
Rϕ - reference voltage
Iϕ = 10 µA, Pins 6 to 5
VRϕ
Temperature coefficient
Iϕ = 10 µA, Pin 6
Iϕ = 1 µA
Min.
Typ.
Max.
-0.003
0.96
TCVRϕ
TCVRϕ
1.02
Unit
%/K
1.10
0.03
0.06
V
%/K
%/K
Pulse Output (see Figure 5-2 on page 8) (Pin 8)
Output-pulse current
V8 = -1.2, RGT = 0 Ω
I0
Output-pulse width
C3 = 3.3 nF, VS = Vlimit
tp
100
125
150
30
mA
µs
Automatic Retriggering (Pin 8)
Turn-on threshold voltage
Repetition rate
I7 ≥ 150 µA
±VION
20
60
mV
tpp
3
5
7.5
tp
I0
5
10
15
µA
25
40
Soft Start (see Figure 5-4 on page 8) (Pin 1)
Starting current
V1–4 = 8 V
Final current
V1–4 = -2 V
Discharge current
Output current
Pin 3
I0
15
-I0
0.5
-I0
0.2
14
µA
mA
2
mA
Mains Voltage Compensation (see Figure 5-5 on page 9)
Current transfer gain I7/I3
Pins 7, Pin 3
Pins 1 and 2 open
Gi
Reverse current
V(R6) = V3 = V7 = 0, Pin 3
±IR
17
20
2
µA
Load-current Detection, V7 = 0 (see Figure 5-7 on page 9)
Transfer gain
I3/V1
Offset current
V1 = 0, V3 = -8 V,
G
0.28
0.32
0.37
µA/mV
I0
0
3
6
µA
Input voltage
Pin 1
-VI
300
400
mV
Input offset voltage
Pin 1
±V0
6
mV
Figure 5-1.
Pin 3
Ramp Control
Phase Angle α (˚)
250
200
33 nF
10 nF 6.8 nF
4.7 nF
3.3 nF
2.2 nF
150
Cϕ/t = 1.5 nF
100
50
0
0
200
400
600
800
1000
Rϕ(R8) (kΩ)
7
4712C–AUTO–07/07
Figure 5-2.
Pulse Output
120
VGT = -1.2 V
100
IGT (mA)
80
60
40
20
0
0
200
400
600
800
1000
RGT (Ω)
Figure 5-3.
Output Pulse Width
400
∆tp/∆Cϕ = 9 µs/nF
tp (µs)
300
200
100
0
0
10
20
30
Cϕ (nF)
Figure 5-4.
Option Soft Start
1
C5 = 1 µF
0
V1-4(V)
-1
10 µF
-2
-3
4.7 µF
-4
Supply
R1 = 22 kΩ/2W
C1 = 100 µF/25V
-5
0
1
2
3
4
5
t (s)
8
U2008B
4712C–AUTO–07/07
U2008B
Figure 5-5.
Mains Voltage Compensation
0
I3 (µA)
-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
R1max (kΩ)
80
60
40
20
0
0
2
4
6
8
1
0
IS (mA)
Figure 5-7.
Load-current Detection
200
V7 = V4 = 0V
VS = -13 V
Reference Point
Pin 4
I5 (µA)
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
PV (W)
8
6
4
2
0
0
10
20
30
50
40
R1 (kΩ)
Figure 5-9.
Power Dissipation of R1 According to Current Consumption
10
Power Dissipation at Series Resistance
PV (W)
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
Remarks
U2008B-xY
DIP8
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.
7.62±0.15
9.6±0.1
0.3 B
A
2.5
3.6±0.1
4.2±0.3
6.7
1.8
1.2±0.3
0.53±0.05
2.54 nom.
0.4 A
6.3±0.1
0.36 max.
3 x 2.54 = 7.62 nom.
B
8.75±0.8
1.54
0.65
8
5
technical drawings
according to DIN
specifications
1
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
0.1+0.15
1.4
0.2
3.7±0.1
0.4
1.27
3.8±0.1
6±0.2
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.
12
Revision No.
History
4712C-AUTO-07/07
• 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
4712B-AUTO-08/05
• Put datasheet in a new template
• First page: Pb-free logo added
• Page 11: Ordering Information changed
U2008B
4712C–AUTO–07/07
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Technical Support
auto_control@atmel.com
Sales Contact
www.atmel.com/contacts
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Literature Requests
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4712C–AUTO–07/07