Simple active-matrix-LCD


Posted on Nov 1, 2012

Figure 1 shows a simple, cost-effective way of providing these bias voltages. A step-up regulator, IC1, forms the heart of the circuit. This regulator switches at a constant frequency of 1 MHz and a fixed duty cycle of 70%. IC1 steps up the input voltage to 5V by storing the energy in the inductor when the internal MOSFET, M1, is on and transferring this energy to C1 when M1 is off. IC1`s hysteretic gated-oscillator control scheme achieves the regulation.



This circuit provides 250 mA at the 5V output, VCOL, with 3% accuracy. The ac ripple is less than 100 mV. The circuit regulates the 10V output, VGATE(+), with 5% accuracy, and this output can provide 10 mA. The ac ripple at the 10V output is approximately




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