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TDA4605-2 Datasheet(PDF) 5 Page - Infineon Technologies AG |
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TDA4605-2 Datasheet(HTML) 5 Page - Infineon Technologies AG |
5 / 23 page Version 2.0 5 1 Jul 2002 TDA 4605-2 Pin Definitions and Functions Pin No. Function 1 Information Input Concerning Secondary Voltage. By comparing the regulating voltage - obtained from the regulating winding of the transformer - with the internal reference voltage, the output impulse width on pin 5 is adjusted to the load of the secondary side (normal load, overload, short-circuit, no load). 2 Information Input Regarding the Primary Current. The primary current rise in the primary winding is simulated at pin 2 as a voltage rise by means of external RC-circuit. If a voltage level is reached which is derived from the control voltage at pin 1, the output impulse at pin 5 is terminated. The RC-circuit is used to set the maximum power of the foldback point. 3 Input for Primary Voltage Monitoring: In the normal operation V3 is moving between the thresholds V3H and V3L (V3H > V3 > V3L). V3 < V3L: SMPS is switched OFF (line voltage too low). V3 > V3H : Compensation of the overload point regulation (controlled by pin 2) starts at V3H : V3L = 1.7. 4 Ground 5 Output: Push-pull output for charging or discharging the gate capacity of the power MOSFET-transistor. 6 Supply Voltage Input. From the voltage at pin 6 a stable internal reference voltage VREF and the switching thresholds V6A , V6E , V6 max and V6 min for the supply voltage detector are derived. If V6 > V6E then VREF is switched on. The reference voltage will be switched off if V6 < V6A . In addition the logic is only enable, for V6 min < V6 < V6 max . 7 Input for Soft-Start and Integrator Circuit. The capacitor connected to ground causes a slow increase of the duration of the output pulse during start-up and an integrating response of the control amplifier. 8 Input for the Feedback of the Oscillator. After the oscillations of the SMPS started, every transition of the feedback voltage through zero (falling edge) triggers an output pulse at pin 5. The trigger threshold is at + 50 mV typical. |
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