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BD9130EFJ Datasheet(PDF) 10 Page - Rohm

No. de Pieza. BD9130EFJ
Descripción  Output 2A or More High-efficiency Step-down Switching Regulator with Built-in Power MOSFET
Descarga  15 Pages
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Fabricante  ROHM [Rohm]
Página de inicio  http://www.rohm.com
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BD9130EFJ Datasheet(HTML) 10 Page - Rohm

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BD9130EFJ
Technical Note
10/14
www.rohm.com
2009.05 - Rev.A
© 2009 ROHM Co., Ltd. All rights reserved.
Gain
[dB]
Phase
[deg]
A
0
0
-90
A
0
0
-90
fz(Amp.)
fp(Min.)
fp(Max.)
fz(ESR)
IOUTMin.
IOUTMax.
Gain
[dB]
Phase
[deg]
4. Determination of RITH, CITH that works as a phase compensator
As the Current Mode Control is designed to limit a inductor current, a pole (phase lag) appears in the low frequency area
due to a CR filter consisting of a output capacitor and a load resistance, while a zero (phase lead) appears in the high
frequency area due to the output capacitor and its ESR. So, the phases are easily compensated by adding a zero to the
power amplifier output with C and R as described below to cancel a pole at the power amplifier.
Fig.30 Open loop gain characteristics
Fig.31 Error amp phase compensation characteristics
Fig.32 Typical application
Stable feedback loop may be achieved by canceling the pole fp (Min.) produced by the output capacitor and the load
resistance with CR zero correction by the error amplifier.
fp=
2π×RO×CO
1
fz(ESR)=
2π×ESR×CO
1
Pole at power amplifier
When the output current decreases, the load resistance Ro
increases and the pole frequency lowers.
fp(Min.)=
2π×ROMax.×CO
1
[Hz]←with lighter load
fp(Max.)=
2π×ROMin.×CO
1
[Hz] ←with heavier load
Zero at power amplifier
fz(Amp.)=
2π×RITH×CITH
1
GND,PGND
SW
VCC,PVCC
EN
VOUT
ITH
VCC
VOUT
Cin
RITH
CITH
L
ESR
CO
RO
VOUT
fz(Amp.)= fp(Min.)
2π×RITH×CITH
1
=
2π×ROMax.×CO
1
Increasing capacitance of the output capacitor lowers the pole
frequency while the zero frequency does not change. (This
is because when the capacitance is doubled, the capacitor
ESR reduces to half.)


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