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TDA4605 Arkusz danych(PDF) 3 Page - Siemens Semiconductor Group |
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TDA4605 Arkusz danych(HTML) 3 Page - Siemens Semiconductor Group |
3 / 21 page Semiconductor Group 35 TDA 4605 Pin Definitions and Functions Pin No. Function 1 Regulating Voltage: Information input concerning secondary voltage. By comparing the regulating voltage - obtained from the regulating winding ot the transformer - with the internal reference voltage, the output impulse width on pin 5 is adapted to the load ot the secondary side (normal, overload, short-circuit, no load). 2 Primary Current Simulation: 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 ot external RC-element. When a value is reached that is derived from the regulating voltage at pin 1, the output impulse at pin 5 is terminated. The RC-element serves to set the maximum power at the overload point set. 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 provides ± 1 A for rapid charge and discharge of the gate capacitance ot the power MOS-transistor. 6 Supply Voltage Input: A stable internal reference voltage VREF is derived from the supply voltage also the switching thresholds V6A , V6E , V6 max and V6 min for the supply voltage detector. If V6 > V6E then VREF is switched on and swiched off when V6 < V6A . In addition the logic is only enable for V6 min < V6 < V6 max. 7 Soft-Start: Input for soft-start. Start-up will begin with short pulses by connecting a capacitor from pin 7 to ground. 8 Zero Detector: Input tor the oscillation feedback. After starting oscillation, every zero transit of the feedback voltage (falling edge) triggers an output impulse at pin 5. The trigger threshold is at + 50 mV typical. |
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