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IR3088AM 数据表(PDF) 21 Page - International Rectifier

部件名 IR3088AM
功能描述  XPHASETM PHASE IC WITH FAULT AND OVERTEMP DETECT
PDF  34 Pages
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制造商  IRF [International Rectifier]
网页  http://www.irf.com
标志 IRF - International Rectifier

IR3088AM 数据表(HTML) 21 Page - International Rectifier

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IR3088A
DESIGN EXAMPLE 1 - VRM 10 2U CONVERTER
SPECIFICATIONS
Input Voltage: VI=12 V
DAC Voltage: VDAC=1.35 V
No Load Output Voltage Offset: VO_NLOFST=20 mV
Output Current: IO=105 ADC
Maximum Output Current: IOMAX=120 ADC
Output Impedance: RO=0.91 mΩ
VCC Ready to VCC Power Good Delay: tVccPG=0-10mS
Soft Start Time: tSS=2 mS
Over Current Delay: tOCDEL=0.5mS
Dynamic VID Down-Slope Slew Rate: SRDOWN=2.5mV/uS
Over Temperature Threshold: TPCB=115 ºC
POWER STAGE
Phase Number: n=6
Switching Frequency: fSW=400 kHz
Output Inductors: L=220 nH, RL=0.47 mΩ
Output Capacitors: AL-Polymer, C=560uF, RC= 7mΩ, Number Cn=10
IR3081 EXTERNAL COMPONENTS
Oscillator Resistor Rosc
Once the switching frequency is chosen, ROSC can be determined from the curve in Figure 13 of IR3081 Data
Sheet. For switching frequency of 400kHz per phase, choose ROSC=30.1kΩ
Soft Start Capacitor CSS/DEL and Resistor RSS/DEL
Because faster over-current protection is required, the soft start capacitor CSS/DEL in series with the resistor
RSS/DEL is used. Calculate the soft start capacitor from the required soft start time.
uF
V
t
I
C
O
SS
CHG
DEL
SS
1
.
0
10
*
20
35
.
1
10
*
2
10
*
70
3
3
6
/
=
−
∗
=
∗
=
−
−
−
Calculate the soft start resistor from the required over current delay time tOCDEL,
Ω
=
∗
−
=
∗
−
=
−
−
−
−
k
I
C
I
t
R
DISCHG
DEL
SS
DISCHG
OCDEL
DEL
SS
10
10
*
6
10
*
1
.
0
10
*
6
10
*
5
.
0
09
.
0
09
.
0
6
6
6
3
/
/
The soft start delay time is
mS
I
I
R
C
t
CHG
CHG
DEL
SS
DEL
SS
SSDEL
86
.
0
10
*
70
)
10
*
70
*
10
*
10
3
.
1
(
10
*
1
.
0
)
3
.
1
(
6
6
3
6
/
/
=
−
∗
=
∗
−
∗
=
−
−
−
The power good delay time is
ms
I
V
C
t
CHG
O
DEL
SS
VccPG
8
.
1
10
*
70
)
3
.
1
33
.
1
91
.
3
(
*
10
*
1
.
0
)
3
.
1
91
.
3
(
*
6
6
/
=
−
−
=
−
−
=
−
−
Page 21 of 34
9/30/04



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