DatasheetsPDF.com

AN701

Vishay Siliconix
Part Number AN701
Manufacturer Vishay Siliconix
Description Designing High-Frequency DC-to-DC Converters With the Si9114A Switchmode Controller
Published Mar 26, 2005
Detailed Description AN701 Vishay Siliconix Designing High-Frequency DC-to-DC Converters With the Si9114A Switchmode Controller INTRODUCTIO...
Datasheet PDF File AN701 PDF File

AN701
AN701

Overview
AN701 Vishay Siliconix Designing High-Frequency DC-to-DC Converters With the Si9114A Switchmode Controller INTRODUCTION Vishay Siliconix’s Si9100 monolithic switchmode PWM controller established the standard for low-power, highefficiency dc-to-dc converters.
This versatile device integrates a number of useful features, including a power MOSFET, high-voltage start circuitry, and low power consumption.
The Si9114A controller pushes the limits for high-frequency power conversion by further reducing delay times and adding additional features.
As a result, dc-to-dc converters can be designed for frequencies up to 1 MHz with simple PWM topologies instead of the complex resonant ones.
S reduce the size of energy storage components S increase reliability by using ceramic capacitors S produce an all-surface-mount assembly solution S lower system costs S simplify the implementation of a distributed power architecture.
Traditionally, distributed power has been regarded as costly and impractical to implement due to the high cost of local power conversion and the perceived complexity of resonant power supplies.
But these decision criteria are now being changed by the availability of small-outline control ICs, LITTLE FOOTr MOSFETs, ceramic capacitors, and new magnetic components.
The Si9114A uses constant frequency current mode control.
By increasing the conversion frequency, power supply designers will be able to: FB 5 COMP 6 Error Amplifier CURRENT SENSE 13 SYNC 10 ROSC 8 COSC 9 B2 Enable 2V + – – + 4.
6 V 20 mA R Q S + – 1.
25 V –VIN Substrate 20 mA OSC Out OSC 4 NI 3 VREF – + Ref Gen 12 DRIVER OUTPUT 11 –VIN VCC 7 SS VCC 14 Q 2 S R SHUTDOWN 1 +VIN – – + 0.
2 V + 9.
2 V – + Undervoltage Lockout Figure 1 Si9114A Block Diagram Document Number: 70575 16-Jan-01 www.
vishay.
com 1 AN701 Vishay Siliconix FUNCTIONAL DESCRIPTION OF THE SI9114A BID/CMOS PWM CONTROLLER The Si9114A controller is similar in configuration to the Si9110.
It uses a traditional constant frequ...


Similar Datasheet


@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site. (Privacy Policy & Contact)