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IR3521 датащи(PDF) 37 Page - International Rectifier

номер детали IR3521
подробное описание детали  XPHASE3TM AMD SVID CONTROL IC
PDF  45 Pages
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производитель  IRF [International Rectifier]
домашняя страница  http://www.irf.com
Logo IRF - International Rectifier

IR3521 датащи(HTML) 37 Page - International Rectifier

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IR3521
Page 37
V3.03
DESIGN EXAMPLE – AMD FIVE + ONE PHASE DUAL OUTPUT CONVERTER (FIGURE 17)
SPECIFICATIONS
Input Voltage: VI=12 V
DAC Voltage: VDAC=1.2 V
No Load Output Voltage Offset for output1: VO_NLOFST=15 mV
Output1 Current: IO1=95 ADC
Output2 Current: IO1=20 ADC
Output1 Over Current Limit: Ilimit1=115 ADC
Output2 Over Current Limit: Ilimit2= 25 ADC
Output Impedance: RO1=0.3 mΩ
Dynamic VID Slew Rate: SR=3.25mV/uS
Over Temperature Threshold: TMAX=110 ºC
POWER STAGE
Phase Number: n1=5, n2=1
Switching Frequency: fSW=520 kHz
Output Inductors: L1=120 nH, L2=220 nH, RL1= 0.52mΩ, RL2= 0.47mΩ
Output Capacitors: POSCAPs, C=470uF, RC= 8mΩ, Number Cn1=9, Cn2=5
IR3500 EXTERNAL COMPONENTS
Oscillator Resistor RROSC
Once the switching frequency is chosen, RROSC can be determined from Figure 2. For switching frequency of
520kHz per phase, choose ROSC=23.2kΩ.
Soft Start Capacitor CSS/DEL
Determine the soft start capacitor from the required soft start time.
uF
Vboot
I
TD
C
CHG
DEL
SS
1
.
0
0
.
1
10
*
50
*
10
*
2
*
2
6
3
/
The soft start delay time is
mS
I
C
TD
CHG
DEL
SS
2
.
2
10
*
50
1
.
1
*
10
*
1
.
0
1
.
1
*
1
6
6
/
The PGOOD delay time is
mS
I
V
C
TD
CHG
boot
DEL
SS
6
.
3
10
*
50
)
1
.
1
1
92
.
3
(
*
10
*
1
.
0
)
1
.
1
92
.
3
(
*
3
6
6
/
The maximum over current fault latch delay time is
mS
I
C
t
DISCHG
DEL
SS
OCDEL
638
.
0
10
*
47
12
.
0
*
10
*
1
.
0
12
.
0
*
6
6
/



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