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BD95700MUV Datasheet(PDF) 8 Page - Rohm

Part # BD95700MUV
Description  2phase Switching Regulator Controllers for Graphic Card
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Manufacturer  ROHM [Rohm]
Direct Link  http://www.rohm.com
Logo ROHM - Rohm

BD95700MUV Datasheet(HTML) 8 Page - Rohm

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BD95700MUV
Technical Note
8/20
www.rohm.com
2009.04 - Rev.B
© 2009 ROHM Co., Ltd. All rights reserved.
External Component Selection
1. Inductor (L) selection
Passing a current larger than the inductor’s rated current will cause magnetic saturation in the inductor and decrease
system efficiency. In selecting the inductor, be sure to allow enough margin to assure that peak current does not exceed
the inductor rated current value.
To minimize possible inductor damage and maximize efficiency, choose a inductor with a low (DCR, ACR) resistance.
2. Output Capacitor (CO) Selection
Please give due consideration to the conditions in formula (7) below for output capacity, bearing in mind that output rise
time must be established within the soft start time frame.
Note: Improper capacitor may cause startup malfunctions.
3. Input Capacitor (Cin) Selection
A low ESR capacitor is recommended to reduce ESR loss and maximize efficiency.
Δ
IL=
(VIN-VOUT) x VOUT
L x VIN x f
[A]・・・(3)
Δ
IL=0.3×IOUTmax/2. [A]・・・(4)
L=
(VIN-VOUT) x VOUT
Δ
IL x VIN x f
[H]・・・(5)
At least 20mV ripple voltage of the FB voltage is recommended by taking the
equivalent series resistance and inductance into account.
Output ripple voltage is determined as in formula (6) below.
Δ
VOUT=ΔIL×ESR+ESL×ΔIL/TON・・・(6)
Co≦
3msec×(Limit-IOUT/2)
VOUT
・・・
(7)
Input Capacitor
IRMS=
VOUT(VIN-VOUT)
VIN
[A]・・・(8)
IOUT
4
Δ
IL
VIN
IL
L
Co
VOUT
Output Ripple Current
VIN
L
Co
VOUT
Cin
VIN
L
Co
VOUT
ESR
Output Capacitor
ESL
The inductor value is a major influence on the output ripple
current. As formula (3) below indicates, the greater the inductor or
the switching frequency, the lower the ripple current.
The proper output ripple current setting is about 30% of maximum
output current.
(ΔIL: output ripple current; f: switch frequency)
(ΔIL: Output ripple current; ESR: CO equivalent series resistance,
ESL:equivalent series inductance)
In selecting a capacitor, make sure the capacitor rating allows sufficient
margin relative to output voltage. Note that a lower ESR can minimize output
ripple voltage.
Limit: Current Limit Value
The input capacitor selected must have low enough ESR resistance to fully
support large ripple output, in order to prevent extreme over current. The formula
for ripple current IRMS is given in (8) below.
Where VIN=2×VOUT,IRMS=
x
2
IOUT


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