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UC3843AN Folha de dados(PDF) 2 Page - STMicroelectronics |
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UC3843AN Folha de dados(HTML) 2 Page - STMicroelectronics |
2 / 16 page UC384XA - UC284XA 2/16 Table 2. Absolute Maximum Ratings * All voltages are with respect to pin 5, all currents are positive into the specified terminal. Figure 3. DIP-8/SO-8 Pin Connection (Top view) Table 3. Pin Description Symbol Parameter Value Unit Vi Supply Voltage (low impedance source) 30 V Vi Supply Voltage (Ii < 30mA) Self Limiting IO Output Current ±1A EO Output Energy (capacitive load) 5 µJ Analog Inputs (pins 2, 3) – 0.3 to 5.5 V Error Amplifier Output Sink Current 10 mA Ptot Power Dissipation at Tamb ≤ 25 °C (DIP-8) 1.25 W Ptot Power Dissipation at Tamb ≤ 25 °C (SO-8) 800 mW Tstg Storage Temperature Range – 65 to 150 °C TJ Junction Operating Temperature – 40 to 150 °C TL Lead Temperature (soldering 10s) 300 °C N° Pin Function 1 COMP This pin is the Error Amplifier output and is made available for loop compensation. 2VFB This is the inverting input of the Error Amplifier. It is normally connected to the switching power supply output through a resistor divider. 3ISENSE A voltage proportional to inductor current is connected to this input. The PWM uses this information to terminate the output switch conduction. 4RT/CT The oscillator frequency and maximum Output duty cycle are programmed by connecting resistor RT to Vref and cpacitor CT to ground. Operation to 500kHz is possible. 5 GROUND This pin is the combined control circuitry and power ground. 6 OUTPUT This output directly drives the gate of a power MOSFET. Peak currents up to 1A are sourced and sunk by this pin. 7VCC This pin is the positive supply of the control IC. 8Vref This is the reference output. It provides charging current for capacitor CT through resistor RT. COMP VFB ISENSE RT/CT GROUND OUTPUT Vi VREF 1 3 2 4 6 5 7 8 D95IN332 |
Nº de peça semelhante - UC3843AN |
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Descrição semelhante - UC3843AN |
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