Maker : ATMEL Corporation
Part No. : U2008B

  Datasheet PDF : U2008B.pdf
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Shortcut : U2008B  U2008B  U2008B-M  U2008B-MFP  U2008B-MFPG3 

Product Information

U2008B Low-Cost Phase-Control IC with Soft Start 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 22 kW/2W 230 V ~ R2 330 kW Load 7 Limiting detector Voltage detector 6 Mains voltage compensation R1 D1 BYT51K amax R8 1 MW Automatic retriggering Phase control unit ö = f (V3) U2008B 5 –VS C1 22 mF/ 25 V 4 GND TIC 226 R3 180W 8 Current detector Supply voltage limiting Full wave load current detector Soft start 2 3 R10 100 kW + – Reference voltage Voltage monitoring 1 R14 47 kW P1 Set point R7 R6 ^ V(R6) = ±250 mV C3 3.3 nF C4 100 nF Load current compensation Figure 1. Block diagram with typical circuit: Load current sensing Rev. A4, 12-Jan-01 1 (10) U2008B Ordering Information Extended Type Number U2008B-x U2008B-xFP U2008B-xFPG3 Package DIP8 SO8 SO8 Remarks Tube Tube Taped and reeled 230 V ~ L R2 680 kW Load 22 kW/2W R1 D1 BYT51K amax R8 470 kW 7 Limiting detector Voltage detector 6 Mains voltage compensation Automatic retriggering U2008B Phase control unit ö = f (V3) Supply voltage limiting 5 –VS C1 100 mF/ 25 V 4 GND TIC 226 R3 180W 8 Current detector 1 Full wave load current detector Soft start 2 3 + – Reference voltage Voltage monitoring R10 C5 Soft start 4.7mF/ 25 V C3 10 nF N C4 100 nF 68 kW Set point R7 220 kW P1 50 kW Figure 2. Block diagram with typical circuit: Soft start 2 (10) Rev. A4, 12-Jan-01 U2008B Pin Description Isense Cϕ Control 1 8 Output Pin 1 2 3 4 5 6 7 8 Symbol Isense Cϕ Control GND –VS Rϕ Vsync. Output Function Load current sensing Ramp voltage Control input / compensation output Ground Supply voltage Ramp current adjustment Voltage synchronization Trigger output 2 U2008B 3 7 Vsync. Rϕ *VS 6 GND 4 Figure 3. Pinning 5 Mains Supply, Pin 5, Figure 2 The integrated circuit U2008B, which also contains voltage limiting, can be connected via D1 and R1 via the mains supply. Supply voltage * between Pin 4 (pos., ) and Pin 5 * is smoothed by C1. Series resistance R1 can be calculated as follows: V – V Smax R 1max + 0.85 x M 2 x I tot where: VM VSmax Itot ISmax Ix Phase Control, Pin 6 The function of the phase control is largely 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 ö. The charging current can be regulated, changed, altered using R8 at Pin 6. The maximum phase angle, αmax, (minimum current flow angle ömin) can also be adjusted by using R8 (see figure 5). 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 ms/nF, see figure 7). 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, then the phase angle is at its maximum αmax, i.e., the current flow angle is minimum. The minimum phase angle αmin is set with V3 w –1 V. + + + = = Mains voltage Maximum supply voltage ISmax )Ix = Total current compensation Maximum current consumption of the IC Current consumption of the external components An operation with external stabilized DC voltage...

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