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AN025 Datasheet

Part Number AN025
Manufacturers AIC
Logo AIC
Description Analysis of LDO oscillation issues
Datasheet AN025 DatasheetAN025 Datasheet (PDF)

Analysis of LDO oscillation issues AN025 Introduction Using low noise and stable power supplies is a trend for power application. And LDO is one of the simplest applications. Yet LDO oscillation results in voltage instability. The analysis below tells you how to prevent LDO from oscillation. Vin Vout Error Amplifier R1 + Co GND Vref LDO R2 Fig 1.a: LDO basic structure Vin GND S Rds VgsGp Rpar Cpar D G Error Amplifier Vref LDO Zo Vout R1 + Co Resr Cb R2 Fig 1.b: LDO ac effective c.

  AN025   AN025






Part Number AN027
Manufacturers AIC
Logo AIC
Description Applications for White LED Driver
Datasheet AN025 DatasheetAN027 Datasheet (PDF)

AN027 Applications for White LED Driver in Parallel vs. Series Introduction For the past few years there has been a huge revolution in color LCD displayers for hand-held devices, such as cellular phones, PDAs and DSCs. White Light Emitting Diode (LED) Module, a new technology for LCD displayers, plays an important role in the applications powered by a single-cell Li-ion battery. Due to the operating voltage limit (3.3V~4.2V) of single-cell Li-ion battery, it cannot drive white LEDs, which requ.

  AN025   AN025







Part Number AN026
Manufacturers AIC
Logo AIC
Description The Charger Design with SEPIC Converter
Datasheet AN025 DatasheetAN026 Datasheet (PDF)

AN026 The Charger Design with SEPIC Converter Introduction Recently, the hand-held devices become more and more popular, such as Personal Digital Assistant (PDA), CD workman, digital camera etc… need a great quantity battery for normal operation. Considering the economic effect, the battery chargers for recycle rechargeable battery, like NiMH or NiCd, are extremely important. In this article will introduce the design idea of charger circuit at first. Then directed against the characteristics of.

  AN025   AN025







Part Number AN024
Manufacturers AIC
Logo AIC
Description For LCD Motherboard Power Supply
Datasheet AN025 DatasheetAN024 Datasheet (PDF)

AN024 For LCD Motherboard Power Supply Using AIC1563 Introduction The newest technology of monitor is Flat-Panel Display (FPD). In FPD field, the widest and most grow up application is Liquid Crystal Display (LCD). It has many advantages, such as: light weight, less space, low voltage operating and power saving. They are very attractive. Certainly, on the brightness, contrast and the activity transient despondence of display, they can’t compare with Cathode Ray Tube (CRT) monitor. Fig. 1 shows.

  AN025   AN025







Part Number AN023
Manufacturers AIC
Logo AIC
Description An Useful Model for Charge Pump Converter
Datasheet AN025 DatasheetAN023 Datasheet (PDF)

AN023 An Useful Model for Charge Pump Converter Introduction Analysis This application note focuses on the analysis of the charge pump and its equivalent circuit. The AIC1845 is a micro-power charge pump DC/DC converter that produces a regulated 5V output. This kind of converter uses capacitors to store and transfer energy. Since the capacitors can not change their voltage level abruptly, the voltage ratio of VOUT over VIN is limited to some range. Capacitive voltage conversion is obtained by.

  AN025   AN025







Analysis of LDO oscillation issues

Analysis of LDO oscillation issues AN025 Introduction Using low noise and stable power supplies is a trend for power application. And LDO is one of the simplest applications. Yet LDO oscillation results in voltage instability. The analysis below tells you how to prevent LDO from oscillation. Vin Vout Error Amplifier R1 + Co GND Vref LDO R2 Fig 1.a: LDO basic structure Vin GND S Rds VgsGp Rpar Cpar D G Error Amplifier Vref LDO Zo Vout R1 + Co Resr Cb R2 Fig 1.b: LDO ac effective circuit The LDO in fig. 1.a is composed of four parts - pass element, error amplifier, reference voltage, and feedback resistor. The series pass element, PMOS transistor, is formed into a small signal model. The parasitic parameters, Rpar and Cpar, are signified by the output impedance of the error amplifier and the input impedance of PMOS. An ac prototype of LDO 1 AN025 is shown as fig. 1b, which is a combination of an output capacitor Co with RESR and bypass capacitor Cb. Why does an LDO re.


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