DC/DC Converter. ANP013 Datasheet

ANP013 Converter. Datasheet pdf. Equivalent

ANP013 Datasheet
Recommendation ANP013 Datasheet
Part ANP013
Description 2A PWM Buck DC/DC Converter
Feature ANP013; Application Note AP1509 150KHz, 2A PWM Buck DC/DC Converter Contents 1. Feature 2. Introduction 3. R.
Manufacture Anachip
Datasheet
Download ANP013 Datasheet





Anachip ANP013
Application Note
AP1509 150KHz, 2A PWM Buck DC/DC Converter
Contents
1. Feature
2. Introduction
3. Regulator Design Procedure
4. Design example
ANP013
Preliminary
This application note contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the
use of this product. No rights under any patent accompany the sale of the product.
Rev. A.0 MAR. 18, 2004
1/9



Anachip ANP013
Application Note
AP1509 150KHz, 2A PWM Buck DC/DC Converter
ANP013
Preliminary
1.0 Features
Small board size
- Entire circuit can fit in less than 1 square inches of PCB space
Low implementation cost
- Fewer than 4 discrete components required
ON /OFF control
- Be controlled by external logic level signal
Thermal shut-down and current limit
- Built-in function
Simply feedback compensation
- Lead compensation using external capacitor
Immediate implementation
- Schematic, bill-of-materials and board layout available from Anachip
2.0 Introduction
This application note discusses simple ways to select all necessary components to
implement a step-down (BUCK) regulator and gives a design example. In this example, the
AP1509 monolithic IC is used to design a cost-effective and high-efficiency miniature
switching buck regulator. Please refer to the datasheet for more complete information, pin
descriptions and specifications for the AP1509 will not be repeated here.
This demonstration board allows the designer to evaluate the performance of the
AP1509 series buck regulator in a typical application circuit. The user needs only to supply
an input voltage and a load. The demonstration board can be configured to evaluate fixed
output voltage of 3.3V, 5V, 12V, and an adjustable output version of the AP1509 series.
Operation at other voltages and currents may be accomplished by proper component
selection and replacement.
Anachip Corp.
www.anachip.com.tw
Rev. A.0 MAR.13, 2004
2/9



Anachip ANP013
Application Note
AP1509 150KHz, 2A PWM Buck DC/DC Converter
3.0 Regulator Design Procedure
ANP013
Preliminary
3.0 .1 Given Power Specification
V = Maximum input Voltage
IN (max)
V IN(min) = Minimum input Voltage
V = Regulated Output Voltage
OUT
V = Ripple Voltage (peak to peak), typical value is 1% of the output voltage
RIPPLE
I LOAD(max) = Maximum Load Current
I LOAD(min) = Minimum Load Current before the circuit becomes discontinuous, typical value
is 10% of the maximum load current
F = Switching Frequency (Fixed at a nominal 150KHz)
3.0.2 Programming Output Voltage (Refer to 4.0.4 Demo Board Schematic
P7)
The output voltage is programmed by selection of the divider R1 and R2. Designer should
use resistors R1 and R2 with ±1% tolerance in order to obtain best accuracy of output
voltage. The output voltage can be calculated from the following formula.
Vout = 1.23 x ( 1 + R1 / R2)
Select a value for R2 between 240and 1.5K. The lower resistor values minimize noise
pickup in the sensitive feedback pin.
If designer selects fixed output version of the AP1509, the resistor R1 shall be short and
R2 shall be open.
Anachip Corp.
www.anachip.com.tw
Rev. A.0 MAR.13, 2004
3/9





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