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IR3500MPBF Datasheet(PDF) 35 Page - International Rectifier

Part # IR3500MPBF
Description  XPHASE3TM VR11.0 & AMD PVID CONTROL IC
PDF  47 Pages
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Manufacturer  IRF [International Rectifier]
Direct Link  http://www.irf.com
Logo IRF - International Rectifier

IR3500MPBF Datasheet(HTML) 35 Page - International Rectifier

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IR3500
Page 35 of 47
June 12, 2007
K
V
f
C
L
R
R
I
C
E
E
FB
CP
∗
∗
∗
∗
∗
∗
=
5
)
2
(
2
π
(36)
CP
C
CP
R
f
K
C
∗
∗
=
π
2
(37)
CP
C
CP
R
K
f
C
∗
∗
∗
=
π
2
1
1
(38)
FB
C
FB
R
f
K
C
∗
∗
=
π
2
(39)
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C
FB
C
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1
1
(40)
DESIGN EXAMPLE 1 – AMD OPTERON CONVERTER (FIGURE 20)
SPECIFICATIONS
Input Voltage: VI=12 V
DAC Voltage: VDAC=1.3 V
No Load Output Voltage Offset: VO_NLOFST=10 mV
Output Current: IO=120 ADC
Maximum Output Current: IOMAX=135 ADC
Output Impedance: RO=0.7 m
Soft Start Delay Time: TD1=1-5mS
Soft Start Time: TD2=2 mS
VR Ready Delay Time: TD3=0-10mS
Maximum Over Current Delay: tOCDEL<2.5mS
Dynamic VID Down-Slope Slew Rate: SRDOWN=2.5mV/uS
Over Temperature Threshold: TMAX=115 ºC
POWER STAGE
Phase Number: n=3
Switching Frequency: fSW=250 kHz
Output Inductors: L=470 nH, RL= 1m
Output Capacitors: Polymer, C=560uF, RC= 7m , Number Cn=12
IR3500 EXTERNAL COMPONENTS
Oscillator Resistor Rosc
Once the switching frequency is chosen, ROSC can be determined from the curve in Figure 23. For a switching
frequency of 250kHz per phase, choose ROSC=50k . The reference current for VSETPT and OCSET is given by
11.9 uA.
Soft Start Capacitor CSS/DEL
Determine the soft start capacitor from the required soft start time.
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