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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
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.
230 V ~
Low-cost Phase-control IC with Soft Start U2008B
Block Diagram with Typical Circuit: Load Current Sensing
22 k/2W R2 330 k Load 7 Limiting detector Voltage detector R1 D1 max 6 Mains voltage compensation BYT51K R8 1 M
Automatic retriggering Phase control unit = f(V3)
U2008B
5 -VS C1 Supply voltage limiting 22 F/ 25 V 4 GND
TIC 226 R3 180 1 8
Current detector
Full wave load current detector Soft start 2 3
+
-
Reference voltage Voltage monitoring R14 47 k
R10 R6 ^ V(R6) = 250 mV C3
3.3 nF
100 k
Set point R7
P1
C4
100 nF
Load current compensation
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Figure 1-2.
230 V ~ L
Block Diagram with Typical Circuit: Soft Start
22 k/2W R1 D1 max BYT51K
R2 680 k Load 7 Limiting detector Voltage detector
R8 470 k
6 Mains voltage compensation
Automatic retriggering
U2008B
Phase control unit = f(V3)
Supply voltage limiting 5 -VS C1 100 F 25V 4 GND
TIC 226 R3 180 8
Current detector
1
Full wave load current detector Soft start 2 3
+
-
Reference voltage Voltage monitoring
C5
Soft start 4.7 F/25V
R10 C3 10 nF C4 100 nF
68 k
Set point R7 220 k
P1 50 k
N
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2. Pin Configuration
Figure 2-1. Pinning
ISENSE 1 8 OUTPUT
C
2 U2008B
7
VSYNC
CONTROL
3
6
R
GND
4
5
-VS
Table 2-1.
Pin 1 2 3 4 5 6 7 8
Pin Description
Symbol ISENSE C CONTROL GND -VS R VSYNC OUTPUT Function Load current sensing Ramp voltage Control input/compensation output Ground Supply voltage Ramp current adjustment Voltage synchronization Trigger output
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 - V Smax R 1max = 0.85 x ----------------------------2 x 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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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 . The charging current can be regulated, changed or altered using R8 at Pin 6. The maximum phase angle, max, (minimum current flow angle min) 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 s/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.
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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 . 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.
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3. Absolute Maximum Ratings
VS = 14 V, reference point Pin 4, unless otherwise specified
Parameters Current limitation Pin 5 t 10 s Synchronous currents Pin 7 t 10 s 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 Input voltage Pin 8 Storage temperature range Junction temperature range +VI -VI Tstg Tj 2 VS -40 to +125 -10 to +125 V V C C II VI 1 -VS to +2 mA V -VI II -Imax VS to 0 500 0.5 V mA mA Symbol -IS -iS IsyncV isyncV Value 30 100 5 20 Unit mA mA mA mA
4. Thermal Resistance
Parameters DIP8 Junction ambient SO8 on p.c. So8 on ceramic Symbol RthJA RthJA RthJA Value 110 220 140 Unit K/W K/W K/W
5. Electrical Characteristics
Parameters Supply (Pin 5) Supply-voltage limitation Current requirement Voltage Monitoring (Pin 5) Turn-on threshold Phase Control Input current Voltage limitation Charge current Start voltage Voltage sync. Pin 7 Current sync. Pin 8 IL = 2 mA Pin 7 Pin 7 Pin 2 IsyncV IsyncI VsyncV I -Vmax 0.15 3 8.0 1 1.85 1.95 8.5 2 30 9.0 100 2.05 mA A V A V -VTON 11.3 12.3 V -IS = 3.5 mA -IS = 30 mA Pins 1, 4 and 7 open -VS -VS -IS 14.5 14.6 16.5 16.8 3.0 V V mA Test Conditions Symbol Min. Typ. Max. Unit
Reference Ramp (see Figure 5-1 on page 7)
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5. Electrical Characteristics (Continued)
Parameters Temperature coefficient of start voltage R - reference voltage Temperature coefficient Test Conditions Pin 2 I = 10 A, Pins 6 to 5 I = 10 A, Pin 6 I = 1 A V8 = -1.2, RGT = 0 C3 = 3.3 nF, VS = Vlimit Symbol -TCR VR TCVR TCVR I0 tp VION I7 150 A V1-4 = 8 V V1-4 = -2 V Pin 3 Pins 7, Pin 3 Pins 1 and 2 open V(R6) = V3 = V7 = 0, Pin 3 I3/V1 V1 = 0, V3 = -8 V, Pin 1 Pin 1 Pin 3 tpp I0 I0 -I0 -I0 20 3 5 15 0.5 0.2 2 5 10 25 100 0.96 Min. Typ. -0.003 1.02 0.03 0.06 125 30 60 7.5 15 40 150 1.10 Max. Unit %/K V %/K %/K mA s mV tp A A mA mA
Pulse Output (see Figure 5-2 on page 8) (Pin 8) Output-pulse current Output-pulse width Automatic Retriggering (Pin 8) Turn-on threshold voltage Repetition rate Starting current Final current Discharge current Output current Mains Voltage Compensation (see Figure 5-5 on page 9) Current transfer gain I7/I3 Reverse current Transfer gain Offset current Input voltage Input offset voltage Gi IR G I0 -VI V0 0.28 0 300 0.32 3 14 17 20 2 0.37 6 400 6 A A/mV A mV mV Soft Start (see Figure 5-4 on page 8) (Pin 1)
Load-current Detection, V7 = 0 (see Figure 5-7 on page 9)
Figure 5-1.
Ramp Control
250
Phase Angle ()
200
33 nF
10 nF 6.8 nF
4.7 nF
3.3 nF
2.2 nF
150
100
C/t = 1.5 nF
50
0 0 200 400 600 800 1000
R(R8) (k)
7
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Figure 5-2.
Pulse Output
120 100 80 VGT = -1.2 V
IGT (mA)
60 40 20 0 0 200 400 600 800 1000
RGT ()
Figure 5-3.
Output Pulse Width
400 tp/C = 9 s/nF 300
tp (s)
200
100
0 0 10 20 30
C (nF)
Figure 5-4.
Option Soft Start
1 0 -1
V1-4(V)
C5 = 1 F
10 F -2 -3 -4 -5 0 1 2 t (s) 3 4 5 4.7 F Supply R1 = 22 k/2W C1 = 100 F/25V
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Figure 5-5. Mains Voltage Compensation
0
-40
I3 (A)
-80
-120
-160 Pin 1 open VS = -13 V -200 -2 -1 0 1 2 Reference Point Pin 4
I7 (mA)
Figure 5-6.
Maximum Resistance of R1
100 Max. Series Resistance VM = 230 V
80
R1max (k)
60
40
20
0 0 2 4 IS (mA) 6 8
1 0
Figure 5-7.
Load-current Detection
200 V7 = V4 = 0V VS = -13 V 160 Reference Point Pin 4
I5 (A)
120
80
40
0 -400
-200
0
200
400
V(R6) (mV)
9
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Figure 5-8.
Power Dissipation of R1
10 Power Dissipation at Series Resistance R1 8
PV (W)
6
4
2
0 0 10 20 30 R1 (k) 40 50
Figure 5-9.
Power Dissipation of R1 According to Current Consumption
10 Power Dissipation at Series Resistance 8
PV (W)
6
4
2
0 0 3 6 9 12 15
IS (mA)
10
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6. Ordering Information
Extended Type Number U2008B-xY U2008B-xFPY U2008B-xFPG3Y Package DIP8 SO8 SO8 Remarks Tube, Pb-free Tube, Pb-free Taped and reeled, Pb-free
7. Package Information
Package: DIP8 Dimensions in mm 9.8 max. 9.60.1 1.20.3 4.20.3 3.60.1 1.8 7.620.15 0.3 B A
6.7 2.5
0.530.05
0.4 A
6.30.1
0.36 max.
2.54 nom.
B 1.54
3 x 2.54 = 7.62 nom.
8.750.8
0.65 8 5
technical drawings according to DIN specifications
1 Drawing-No.: 6.543-5040.01-4 Issue: 1; 16.01.02
4
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Package: SO 8 Dimensions in mm 4.90.1 50.2 3.70.1
0.2
0.1+0.15
1.4
0.4 1.27 3.81
3.80.1 60.2
8
5
technical drawings according to DIN specifications
1 Drawing-No.: 6.541-5031.01-4 Issue: 1; 15.08.06
4
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 * Put datasheet in a new template * First page: Pb-free logo added * Page 11: Ordering Information changed
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