LM2622 Step-Up DC/DC Converter Evaluation Board Introduction LM26

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LM2622 Step-Up DC/DC Converter Evaluation Board Introduction LM26

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LM2622 Step-Up DC/DC Converter Evaluation Board
LM2622 Step-Up DC/DC Converter Evaluation Board
Introduction LM2622 step-up converter with adjustable switching frequency power shutdown feature. evaluation board designed boosting I-cell Li-Ion battery input volatge regulated output board includes jumpers: selects whether part running
National Semiconductor Application Note 1198 Clinton Jensen 2001
shutdown mode, other selects switching frequency either MHz. component values board designed operation, will work well 1.3MHz. Smaller component values generally used part operated higher frequency. bill materials schematic follows:
TABLE Bill Materials Designator CIN2 COUT1 RFB1 RFB2 Description Step-Up Regulator Inductor (1.2A average rating) Input Capacitor (22µF, rating) Output Capacitor (10µF, rating) Output Diode 20.5 Feedback Resistor 6.98 Feedback Resistor Compensation Resistor Compensation Resistor inductor also required input current expected exceed 1.2A, output short circuit conditions anticipated. Manufacturer National Semiconductor Sumida Taiyo-Yuden Taiyo-Yuden International Rectifier Model Number LM2622 CRDH5D18-100NC LMK432BJ226K EMK325BJ106K 15MQ040N
Because capacitor ratings, input board should always less output should higher than 16V. Higher voltages limits) used higher voltage capacitors used. larger
AN200218-1
AN-1198
2001 National Semiconductor Corporation
AN200218
www.national.com
LM2622 Step-Up DC/DC Converter Evaluation Board
Notes
LIFE SUPPORT POLICY NATIONAL'S PRODUCTS AUTHORIZED CRITICAL COMPONENTS LIFE SUPPORT DEVICES SYSTEMS WITHOUT EXPRESS WRITTEN APPROVAL PRESIDENT GENERAL COUNSEL NATIONAL SEMICONDUCTOR CORPORATION. used herein: Life support devices systems devices systems which, intended surgical implant into body, support sustain life, whose failure perform when properly used accordance with instructions provided labeling, reasonably expected result significant injury user. critical component component life support device system whose failure perform reasonably expected cause failure life support device system, affect safety effectiveness.
AN-1198
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National does assume responsibility circuitry described, circuit patent licenses implied National reserves right time without notice change said circuitry specifications.

LM2622 Step-Up DC/DC Converter Evaluation Board Introduction LM26

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