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| U490B One-Shot Phase-Control IC Description The monolithic integrated bipolar circuit, U490B, is a one-shot power control circuit, designed to control the thyristor which is mainly used in electric stapler devices. The IC is preferred to realise a one-shot phase control, where any phase angle and thus any intensity of the load voltage is adjustable. After successful triggering and the following delay time, an ignition pulse at the output is released. A further triggering is only possible after the elapse of the delay time. D Supply current x2 mA D Mains supply via resistor Features D Phase controlled thyristor ignition D Triggering with time delay D Repetition time delay Applications D Electric stapler devices Block Diagram L D1 1N4007 R1 Vmains 230 VX C1 47 mF 10 V 8 VS 3 Start delay Sync. Repetition delay Trigger control 2 C2 47 nF R2 220 kW 24 kW/ 2W S1 R3 220 kW C3 1.5 nF N Supply GND stage 4 Load D2 Phase control POR Control input 5 R5 47 kW C6 150 nF Output stage Ramp 7 R7 33 W C7 22 nF R4 220 W C4 47 nF/ 250 VX U490B 6 C5 150 nF [68 kW Figure 1. Block diagram with external circuit Ordering Information Extended Type Number U490B-x U490B-xFP U490B-xFPG3 Package DIP8 SO8 SO8 Remarks Tube Tube Taped and reeled Rev. A3, 12-Jan-01 1 (6) U490B Pin Description n.c. Trigger 1 2 8 VS 7 Output Pin 1 2 3 4 5 6 7 8 Symbol n.c. Trigger Sync. GND Contr Ramp Output VS Function Not connected Triggering Synchronization Ground Control input Ramp Output Supply voltage U490B Sync. 3 GND 4 Figure 2. Pinning 6 Ramp 5 Contr Supply, Pin 8 Internal voltage limiter enables a simple supply from the mains via series resistor R1.The supply voltage between Pin 8 (VS) and ground (Pin 4) builts up via R1 and is smoothed by the capacitor C1. Series resistor R1 can be calculated as follows: V - V Smax R 1max [ 0.85 x mains where 2 x I tot Vmains VSmax Itot ISmax IX + + + + + Mains supply voltage Maximum supply voltage ISmax )IX Maximum current consumption of the IC Current consumption of the external components The circuit is released, when four periods of the line voltage have expired after build up of the operating voltage, before the switch S1 is closed. S1 closed V3 (Sync.) open V8 V8 V2 (Trigger) Phase Control, Pins 3, 5 and 6 The circuit is synchronized with mains supply through Pin 3. As long as the switch S1 is open, the circuit is in wait state i.e., the capacitor C6 (150 nF) is discharged and is kept in this state (High level). When the switch S1 is closed, there is a current flow in Pin 2 which is evaluated by the circuit. If this current flows after the elapse of delay time, then the phase control is released. Capacitor, C6, is then charged with I6 + 100 mA towards ground. At the same time, there is a current flow of [ 100 mA into Pin 5, which results in voltage drop across resistor R5. Control voltage, V5, is then 1.5 V lower internally. The output stage is released when the ramp voltage V6 is equal to (V5 * 1.5 V). When the voltage difference is [ 150 mV, it is again turned-off. The result is an output pulse, whose phase shift to the zero crossing of mains voltage is determined by the resistor R5 at control input Pin 5 (see fig. 3). Capacitor C6 is charged to a value of [ 1.5 V. It remains there till the switch S1 again opens and the repetition delay time is over. V7 tp t V6 (Ramp) "X" V7 (Output) 0 50 ms 100 ms t1 150 ms t 200 ms "X" V6 V5 - 1.5 V 150 mV Figure 3. Signal characteristics 2 (6) Rev. A3, 12-Jan-01 U490B Absolute Maximum Ratings Reference point Pin 4 (GND), unless otherwise specified Supply current Output stage Input voltage Input current t v 1 ms Input voltage Junction temperature Ambient temperature Storage temperature range Parameters Pin 8 t v 10 ms Pin 7 Pin 2, 3 Pin 5, 6 Symbol IS is VI " II " II VI Tj Tamb Tstg Value 30 150 - 0.5 to VS 5 30 0 to V8 +125 - 10 to +100 - 40 to +125 Unit mA mA V mA mA V C C C Thermal Resistance Junction ambient Parameters DIP8 SO8 on p.c. SO8 on ceramic Symbol RthJA RthJA RthJA Value 110 220 140 Unit K/W K/W K/W Electrical Characteristics VS + 7 V, Tamb = 25C, reference point Pin 4 (GND), unless otherwise specified Parameters Supply voltage limitation Current consumption Voltage monitoring Switch-on threshold Switch-off threshold Synchronization Voltage limitation Switch-on threshold Switch-off threshold Trigger input Voltage limitation Switch-on threshold Switch-off threshold Start delay time Repetition delay time Test Conditions / Pins IS + 3 mA Pin 8 IS + 30 mA VS + 7 V Pin 8 Pin 8 Symbol VS VS IS VSon VSoff I3 +1 mA I3 + -1 mA Pin 3 Pin 3 - 8 Pin 3 Pin 2 Pin 2 - 8 Pin 2 fmains + 50 Hz Pin 2-7 Vlim -Vlim ITon IToff Vlim -Vlim ITon IToff t1 t2 Min. 7.2 7.4 Typ. 8.2 8.4 Max. 9.2 9.4 2 Unit V V mA V V V V mA mA V V mA mA ms ms 5 3 1.5 0.75 120 35 1.5 0.75 120 35 40 60 60 80 I2 +1 mA I2 + -1 mA Rev. A3, 12-Jan-01 3 (6) U490B Electrical Characteristics (continued) VS + 7 V, Tamb = 25C, reference point Pin 4 (GND), unless otherwise specified Parameters Phase control Control input: Input voltage range Input current Ramp Charge current Discharge current Phase shift Test Conditions / Pins Pin 5, 6, 3 Pin 5 2 V v V5 v V8 Pin 6 2V v V6 v V8 - 0.5 V U5 + 4 V Pin 7-5 C6 + 150 nF, V5 + 2 V , V5 + V8 Pin 7 Status OFF Status ON C6 +150 nF, see figure 3 Symbol Min. Typ. Max. Unit VI II Ich -Idis tdmax tdmin "Io(r) -Io tp 2 50 50 2 90 90 VS 130 130 V mA mA mA ms ms 7 600 10 100 100 200 300 Output stage, V7 + 0 V Output reverse current Output current Pulse width mA mA ms 4 (6) Rev. A3, 12-Jan-01 U490B Package Information Package DIP8 Dimensions in mm 9.8 9.5 1.64 1.44 7.77 7.47 4.8 max 6.4 max 0.5 min 0.58 0.48 7.62 8 5 2.54 3.3 0.36 max 9.8 8.2 technical drawings according to DIN specifications 13021 1 4 Package SO8 Dimensions in mm 5.00 4.85 1.4 0.4 1.27 3.81 8 5 0.25 0.10 0.2 3.8 6.15 5.85 5.2 4.8 3.7 technical drawings according to DIN specifications 13034 1 4 Rev. A3, 12-Jan-01 5 (6) U490B Ozone Depleting Substances Policy Statement It is the policy of Atmel Germany GmbH to 1. Meet all present and future national and international statutory requirements. 2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems with respect to their impact on the health and safety of our employees and the public, as well as their impact on the environment. It is particular concern to control or eliminate releases of those substances into the atmosphere which are known as ozone depleting substances (ODSs). The Montreal Protocol (1987) and its London Amendments (1990) intend to severely restrict the use of ODSs and forbid their use within the next ten years. Various national and international initiatives are pressing for an earlier ban on these substances. Atmel Germany GmbH has been able to use its policy of continuous improvements to eliminate the use of ODSs listed in the following documents. 1. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments respectively 2. Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental Protection Agency (EPA) in the USA 3. Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C (transitional substances) respectively. Atmel Germany GmbH can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain such substances. We reserve the right to make changes to improve technical design and may do so without further notice. Parameters can vary in different applications. All operating parameters must be validated for each customer application by the customer. Should the buyer use Atmel Wireless & Microcontrollers products for any unintended or unauthorized application, the buyer shall indemnify Atmel Wireless & Microcontrollers against all claims, costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal damage, injury or death associated with such unintended or unauthorized use. Data sheets can also be retrieved from the Internet: http://www.atmel-wm.com Atmel Germany GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany Telephone: 49 (0)7131 67 2594, Fax number: 49 (0)7131 67 2423 6 (6) Rev. A3, 12-Jan-01 |
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