iru3055 International Rectifier Corp., iru3055 Datasheet - Page 18

• Manufacturer Part Number: iru3055
• Description: 5-bit Programmable 3-phase Synchronous Buck Controller Ic -
• Manufacturer: International Rectifier Corp.

IRU3055
TYPICAL APPLICATION (2)
For Intel Pentium 4 processor with Vcc VID generation and active voltage droop
18
R19
40K
R20
60K
R12
R14
40K
10K
C18
47nF
5V
U2A
1/4 LM324
U2B
1/4 LM324
Figure 20 - Application circuit of IRU3055 to implement active voltage droop
C9
1uF
5V
C12
22nF
C7
100pF
(Optional)
R3
47K
as well as the 1.2V VID voltage with VccVID Power Good.
27K
R6
R15
40K
C5
1uF
C10
0.1uF
Q7
2N3904
C16
0.47uF
U2C
1/4 LM324
3.3V
Vcc
Ref
Rt
SS
D4
D3
D2
D1
D0
C o m p
IRU3055
OCSet1
PGnd1/
OCGnd
PGnd2
PGnd3
HDrv3
HDrv1
LDrv1
HDrv2
LDrv2
LDrv3
4.7K
VCL23
R13
www.irf.com
VCL1
CS1
CS2
CS3
Fb
C1
1uF
Q9
2N3904
Q8
2N3904
R18
4.7K
2.2K
R1
5V
VID Good
D1
C2
0.1uF
1/4 LM324
R22
80K
R10
1K
U2D
C19
15uF
C17
0.1u
Q1
IRF3704S
Q2
IRF3711S
Q4
IRF3711S
Q5
IRF3704S
Q6
IRF3711S
Q3
IRF3704S
C3
1uF
5V
R 1 1
1.07K
2.2K
1uH
R2
1.5K
R4
1.5K
R5
1.5K
R 8
R21
1K
L1
R16
3.24K
R7
2.2K
C6
6x 1500uF
R17
1M
V
C4
1000uF
R9
2.2K
VID 1.2V
Ref 2V
1uH
1uH
1uH
L2
L3
L4
1uF
C 1 1
1uF
C13
1uF
C15
C8
1uF
12V
1.5V / 60A
08/13/02
Rev. 1.4
C14
8x 2700uF