BD8305MUV Rohm, BD8305MUV Datasheet - Page 12

• Manufacturer Part Number: BD8305MUV
• Description: High-effciency Step-up/down Switching Regulators
• Manufacturer: Rohm

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BD8305MUV
c
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For setting of phase-lead frequency, both of them should be put near LC resonance frequency.
When GBW frequency becomes too high due to the secondary phase lead, it may get stabilized by setting the primary
phase delay to a frequency slightly higher than the LC resonance frequency by R3 to compensate it.
R1
R2
Fig.35 Example of setting of phase compensation
C1
R3
R4
C2
LC resonance frequency =
FB
Phase delay fp1 =
Phase lead fz1 =
Phase lead fz2 =
12/15
2πR1C1
2πR4C2
2πR3C1
2π√(LC)
1
1
1
1
[Hz]
[Hz]
[Hz]
[Hz]
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Technical Note
2010.05 - Rev.D
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