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MC33364D1R2G bảng dữ liệu(PDF) 11 Page - ON Semiconductor |
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11 / 16 page MC33364 http://onsemi.com 11 The MOC8102 has a typical current transfer ratio (CTR) of 100% with 25% tolerance. When the TL431 is full−on, 5 mA will be drawn from the transistor within the MOC8102. The transistor should be in saturated state at that time, so its collector resistor must be R collector + V ref * Vsat I LED + 5.0 V * 0.3 V 5.0 mA + 940 W Since a resistor of 5.0 k is internally connected from the reference voltage to the feedback pin of the MC33364, the external resistor can have a higher value Rext + R3 + (R int )(R collector ) (R int ) * (R collector ) + (5.0 k)(940) 5.0 k * 940 + 1157 W [ 1200 W This completes the design of the voltage feedback circuit. In no load condition there is only a current flowing through the optoisolator diode and the voltage sense divider on the secondary side. The load at that condition is given by: R noload + Vout (I LED ) I div ) + 6.0 V (5.0 mA ) 0.25 mA) + 1143 W The output filter pole at no load is: f ph + 1 (2 p R noload Cout ) + 1 (2 p)(1143)(300 mF) + 0.46 Hz In heavy load condition the ILED and Idiv is negligible. The heavy load resistance is given by: R heavy + Vout Iout + 6.0 V 2.0 A + 3.0 W The output filter pole at heavy load of this output is f ph + 1 (2 p R heavy Cout) + 1 (2 p)(3)(300 mF) + 177 Hz The gain exhibited by the open loop power supply at the high input voltage will be: A + V in max * Vout 2 Ns (V in max )(Verror)(Np) + (382 V * 6.0 V) 2 (7) (382 V)(1.2 V)(139) + 15.53 + 23.82 dB The maximum recommended bandwidth is approximately: fc + fs min 5 + 70 kHz 5 + 14 kHz The gain needed by the error amplifier to achieve this bandwidth is calculated at the rated load because that yields the bandwidth condition, which is: Gc + 20 log fc f ph * A + 20 log 14 kHz 177 * 23.82 dB + 14.14 dB The gain in absolute terms is: Ac + 10 (Gc 20) + 10(14.14 20) + 5.1 Now the compensation circuit elements can be calculated. The output resistance of the voltage sense divider is given by the parallel combination of resistors in the divider: R in + Rupper || Rlower + 10 k || 14 k + 5833 W R9 + (Ac) (R in ) + 29.75 k [ 30 k C8 + 1 2 p (Ac)(R in )(fc) + 382 pF [ 390 pF The compensation zero must be placed at or below the light load filter pole: C7 + 1 2 p (R9) (fpn) + 11.63 mF [ 10 mF |
Số phần tương tự - MC33364D1R2G |
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Mô tả tương tự - MC33364D1R2G |
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