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AN013 Datasheet(PDF) 1 Page - Analog Intergrations Corporation |
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AN013 Datasheet(HTML) 1 Page - Analog Intergrations Corporation |
1 / 6 page AN013 July 2000 1 Optimized external driver for AIC1639 Introduction AIC1639 is a member of AIC1638 PFM ( Pulse Frequency Modulation ) controller IC family, for step-up DC/DC converter featuring high efficiency and low ripple voltage, which is exactly the same as AIC1638 except the external driver with higher output current comparing to the built-in edition ( AIC1638 ). The figures are shown below : The key electrical characteristics of AIC1639 ü PFM based control ü 75% ( Typ. ) oscillator duty cycle , 100KHz ( Typ. ) switching frequency ü Low start up voltage Figure 1a Figure 1b Principle of step-up DC/DC converter operation A step-up DC/DC converter charges energy in the inductor when the switch is on and discharges the energy with additional energy from Input Power Source thereto. Therefore a higher voltage output, than input, is obtained. The operation will be explained with reference to the following diagrams : |
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