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UAA2016ADG Datasheet(PDF) 3 Page - ON Semiconductor |
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UAA2016ADG Datasheet(HTML) 3 Page - ON Semiconductor |
3 / 12 page UAA2016 http://onsemi.com 3 Load CF MAC212A8 Rout 8 5 Rsync VEE Vref Temp. Red. Rdef HysAdj S2 RS Figure 1. Application Schematic R1 Synchronization + 1 S1 R2 4 R3 − 11−Bit Counter 4−Bit DAC 3 UAA2016 1/2 Failsafe Pulse Amplifier Sampling Full Wave Logic Internal Reference Supply Voltage 2 +VCC 7 Output 6 RS Sync + ++ Sense Input APPLICATION INFORMATION (For simplicity, the LED in series with Rout is omitted in the following calculations.) Triac Choice and Rout Determination Depending on the power in the load, choose the triac that has the lowest peak gate trigger current. This will limit the output current of the UAA2016 and thus its power consumption. Use Figure 4 to determine Rout according to the triac maximum gate current (IGT) and the application low temperature limit. For a 2.0 kW load at 220 Vrms, a good triac choice is the ON Semiconductor MAC212A8. Its maximum peak gate trigger current at 25 °C is 50 mA. For an application to work down to − 20 °C, Rout should be 60 W. It is assumed that: IGT(T) = IGT(25°C) exp (−T/125) with T in °C, which applies to the MAC212A8. Output Pulse Width, Rsync The pulse with TP is determined by the triac’s IHold, ILatch together with the load value and working conditions (frequency and voltage): Given the RMS AC voltage and the load power, the load value is: RL = V2rms/POWER The load current is then: I Load + (Vrms 2 sin(2 pft)–V TM ) R L where VTM is the maximum on state voltage of the triac, f is the line frequency. Set ILoad = ILatch for t = TP/2 to calculate TP. Figures 6 and 7 give the value of TP which corresponds to the higher of the values of IHold and ILatch, assuming that VTM = 1.6 V. Figure 8 gives the Rsync that produces the corresponding TP. RSupply and Filter Capacitor With the output current and the pulse width determined as above, use Figures 9 and 10 to determine RSupply, assuming that the sinking current at Vref pin (including NTC bridge current) is less than 0.5 mA. Then use Figure 11 and 12 to determine the filter capacitor (CF) according to the ripple desired on supply voltage. The maximum ripple allowed is 1.0 V. Temperature Reduction Determined by R1 (Refer to Figures 13 and 14.) |
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