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BA3259HFP Datasheet(PDF) 7 Page - Rohm |
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BA3259HFP Datasheet(HTML) 7 Page - Rohm |
7 / 10 page BA3259HFP,BA30E00WHFP Technical Note 7/9 www.rohm.com 2009.04 - Rev.A © 2009 ROHM Co., Ltd. All rights reserved. Input / Output Equivalent Circuits BA3259HFP BA30E00WHFP Explanation of external components BA3259HFP 1) Vcc (Pin 1) It is recommended that a ceramic capacitor with a capacitance of approximately 3.3 F is placed between Vcc and GND at a position closest to the pins as possible. 2) Vo (Pins 4 and 5) Insert a capacitor between Vo and GND in order to prevent output oscillation. The capacitor may oscillate if the capacitance changes as a result of temperature fluctuations. Therefore, it is recommended that a ceramic capacitor with a temperature coefficient of X5R or above and a maximum capacitance change (resulting from temperature fluctuations) of ±10% be used. The capacitance should be between 1 F and 1,000F. (Refer to Fig. 28.) BA33E00HFP 1) Vcc1 (Pin 3) and Vcc2 (Pin 2) Insert capacitors with a capacitance of 1 F between Vcc1 and GND and Vcc2 and GND. The capacitance value will vary depending on the application. Be sure to implement designs with sufficient margins. 2) Vo1 (Pin 5) and Vo2 (Pin 6) Insert a capacitor between Vo and GND in order to prevent oscillation. The capacitance of the capacitor may greatly vary with temperature changes, making it impossible to completely prevent oscillation. Therefore, use a tantalum aluminum electrolytic capacitor with a low ESR (Equivalent Serial Resistance) that ensures good performance characteristics at low temperatures. The output oscillates if the ESR is too high or too low. Refer to the ESR characteristics in Fig. 29 and operate the IC within the stable operating region. If there is a sudden load change, use a capacitor with a higher capacitance . A capacitance between 47 F and 1,000F is recommended. Fig.30 BA3259HFP I/O Equivalent Circuits Fig.31 BA30E00WHFP I/O Equivalent Circuit Vcc Vo1 Vcc Vo2 ADJ Vcc1 Vcc2 Vo2 Vcc1 Vo1 ADJ |
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Similar Description - BA3259HFP_09 |
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