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TDA16847 Scheda tecnica(PDF) 9 Page - Infineon Technologies AG |
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TDA16847 Scheda tecnica(HTML) 9 Page - Infineon Technologies AG |
9 / 28 page TDA 16846 TDA 16847 Data Sheet 9 2000-01-14 Figure 5 Startup Voltage Diagram Primary Current Simulation PCS (Pin 2) / Current Limiting A voltage proportional to the current of the power transistor is generated at Pin 2 by the RC-combination R 2, C2 (Figure 4). The voltage at Pin 2 is forced to 1.5 V when the power transistor is switched off and during its switch on time C 2 is charged by R2 from the rectified mains. The relation of V 2 and the current in the power transistor (Iprimary) is : L primary: Primary inductance of the transformer The voltage V 2 is applied to one input of the On Time Comparator ONTC (see Figure 2). The other input is the control voltage. If V 2 exceeds the control voltage, the driver switches off (current limiting). The maximum value of the control voltage is the internal reference voltage 5 V, so the maximum current in the power transistor ( I Mprimary) is : The control voltage can be reduced by either the Error Amplifier EA (current mode regulation), or by an opto coupler at Pin 5 (regulation with opto coupler isolation) or by the voltage V 11 at Pin 11 (Fold Back Point Correction). AED02650 t Startup Operation 14 V Vmax On V VOff V 2 1,5 V Lprimary Iprimary × R 2 C 2 × -------------------------------- + = I Mprimar y 3,5 V R2 × C2 × Lprimary -------------------------------------- = |
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