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BA3259HFP データシート(PDF) 7 Page - Rohm

部品番号 BA3259HFP
部品情報  Dual-output Secondary Fixed/Variable Output LDO Regulators for Local Power Supplies
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メーカー  ROHM [Rohm]
ホームページ  http://www.rohm.com
Logo ROHM - Rohm

BA3259HFP データシート(HTML) 7 Page - Rohm

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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 1,000F. (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 1,000F 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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