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TDA4605 датащи(PDF) 2 Page - STMicroelectronics |
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TDA4605 датащи(HTML) 2 Page - STMicroelectronics |
2 / 7 page TDA4605 2/7 PIN CONFIGURATION Figure 2. Block Diagram Pin Number Description 1 Regulating voltage : 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 pulse width on Pin 5 is adapted to the load of 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 of external RC element. When a value is reached that is derived from the regulating voltage at Pin 1, the output pulse at Pin 5 is terminated. The RC element serves to set the maximum power at the overload point. 3 Primary voltage detector : input for primary voltage monitoring. When the line voltage is too low the IC is switched-off by comparing V3 with an internal reference. Voltage at Pin 3 is used for overload point compensation. 4 Ground 5 Output : push-pull output for charge and discharge of the gate capacitance of the power MOS transistor. 6 Supply voltage : Supply voltage input. From it are derived a stable internal reference voltage (VREF) and the switching threshold V6A, V6E, V6 max and V6 min for the supply voltage detector. if V6 > V6E the VREF is switched on and switched off when V6 < V6A. In addition the logic is only enable for V6 min < V6 < V6 max. 7 Soft-start : input for soft-start and integration network. Start-up will begin with short pulses by connecting a capacitor between Pin 7 to ground. This capacitor together with a resistor connected between Pin 7 and error amplifier output also as acts an integrator network for regulation. 8 Zero detector : Input for the oscillator feedback. After starting oscillator, every zero transit of the feedback voltage (falling edge) triggers an output pulse at Pin 5. The trigger threshold is at typically - 50mV 1 2 3 4 5 6 7 8 V6min V6max V6E V6A V2B Vst VR Vu VREF Reference Voltage (typ. 3V) Supply Voltage Monitor Primary Current Recopy Output Stage and Current Limit Logic Starting Impulse Generator Regulating & Overload Amplifier Current Source Overload Point Correction Low Voltage Protection Monitoring Stop Comp. Zero Crossing Detector TDA4605 1 |
Аналогичный номер детали - TDA4605 |
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Аналогичное описание - TDA4605 |
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