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MAX16928BGUPV Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX16928BGUPV Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 20 page ����������������������������������������������������������������� Maxim Integrated Products 9 MAX16928 Automotive TFT-LCD Power Supply with Boost Converter and Gate Voltage Regulators Figure 1 shows the functional diagram of the boost regulator. An error amplifier compares the signal at FBP to 1V and changes the COMPV output. The volt- age at COMPV sets the peak inductor current. As the load varies, the error amplifier sources or sinks current to the COMPV output accordingly to produce the peak inductor current necessary to service the load. To main- tain stability at high duty cycles, a slope-compensation signal (set by the capacitor at COMPI) is summed with the current-sense signal. On the rising edge of the internal clock, the controller sets a flip-flop, turning on the n-channel MOSFET and applying the input voltage across the inductor. The current through the inductor ramps up linearly, storing energy in its magnetic field. Once the sum of the current feedback signal and the slope compensation exceeds the COMPV voltage, the controller turns off the MOSFET. The inductor current then flows through the diode to the output. The MOSFET remains off for the rest of the clock cycle. The external p-channel FET controlled by GATE protects the output during fault conditions and provides True Shutdown of the converter. Connect a pullup resistor between GATE and INA (see the Boost Converter section to select the value for the pullup resistor). Under normal operation, GATE turns on the p-channel FET, connecting the supply to the boost input. During a fault condition or in shutdown, GATE is off and the pullup resistor turns off the p-channel FET, disconnecting the supply from the boost input. Figure 1. Boost Converter Functional Diagram LOGIC AND DRIVER LXP CLOCK PGNDP VLIMIT FBP COMPI COMPV ERROR AMP 1V 0.85V FAULT COMPARATOR TO FAULT LOGIC 2.2MHz OSCILLATOR PWM COMPARATOR ILIM COMPARATOR SOFT- START CURRENT SENSE SLOPE COMP Σ MAX16928 |
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