Datenblatt-Suchmaschine für elektronische Bauteile |
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TDA4605-3 Datenblatt(PDF) 3 Page - Siemens Semiconductor Group |
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TDA4605-3 Datenblatt(HTML) 3 Page - Siemens Semiconductor Group |
3 / 20 page Semiconductor Group 76 TDA 4605-3 Pin Definitions and Functions Pin No. Function 1 Information Input Concerning Secondary Voltage. By comparing the regulating voltage - obtained trom 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, 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-element. When a voltage level is reached thats 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 of 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 Input for Soft-Start. Start-up will begin with short pulses by connecting a capacitor from pin 7 to ground. 8 Input for the Oscillation Feedback. After starting oscillation, every zero transition of the feedback voltage (falling edge) through zero (falling edge) triggers an output pulse at pin 5. The trigger threshold is at + 50 mV typical. |
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