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AIC3843CSTR Datasheet(PDF) 9 Page - Analog Intergrations Corporation |
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AIC3843CSTR Datasheet(HTML) 9 Page - Analog Intergrations Corporation |
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9 / 11 page  AIC3843 9 n PIN DESCRIPTIONS PIN 1: COMP - This pin is the error amplifier output and is made available for loop compensation. PIN 2: VFB - This is the inverting input of the error amplifier. It is normally connected to the switching power supply output through a resistor divider. PIN 3: ISENSE - A voltage proportional to inductor current is connected to this input. The PWM uses this information to terminate the output switch conduction. PIN 4: RT/CT - The oscillator frequency and maximum output duty cycle are programmed by connect- ing resistor RT to VREF and capacitor CT to ground. It is feasible to operate when f ≦ 500KHz. PIN 5: GND - This pin is the combined control circuitry and power ground. PIN 6: OUTPUT- This output directly drives the gate of a power MOSFET. Peak currents up to 1A are sourced and sunk by this pin. PIN 7: VCC - This pin is the positive supply of the control IC. PIN 8: VREF - This is the reference output. It provides charging current for capacitor CT through resistor RT. n APPLICATION INFORMATIONS Under voltage Lockout There are two separate under voltage lockout comparators incorporated to make sure that the IC is fully functional before the output stage is enabled. One is for power supply voltage (VCC) and the other is for reference output voltage (VREF). Each has a built in hysteresis to prevent erratic output behavior when their respective thresholds are crossed. For VCC comparator the upper and lower thresholds are 8.4V and 7.6V, respectively. The large hysteresis and low start up current (0.3mA) of the AIC3843 make it ideally suited in off-line converter applications where efficient bootstrap startup techniques are required. A 34V zener is connected as a shunt regulator from VCC to ground. Its purpose is to protect the IC from excessive voltage that can occur during system start-up. Reference Output The 5.0V reference output is trimmed to ±2.0% tolerance at T A=25°C. It supplies charging current to the oscillator timing capacitor and is capable of providing current in excess of 20mA for powering additional control system circuitry. In case of overload, the reference is short-circuit protected at |
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