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TDA16847 Datasheet(PDF) 9 Page - Infineon Technologies AG |
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TDA16847 Datasheet(HTML) 9 Page - Infineon Technologies AG |
9 / 29 page TDA 16846/16846-2 TDA 16847/16847-2 Version 2.0 9 31 Jul 2003 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 equation 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). V2 1,5 V Lprimary Iprimary × R2 C2 × -------------------------------- + = IMprimary 3,5 V R 2 × C 2 × Lprimary -------------------------------------- = |
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