iru3055 International Rectifier Corp., iru3055 Datasheet - Page 6

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

IRU3055
BLOCK DIAGRAM
6
PGood
C o m p
V
Fault
CS2
Gnd
CS1
CS3
Gnd
NC
SET
Vcc
Ref
SD
SS
Fb
D0
D2
D3
D4
D1
Rt
18
10
11
12
13
14
15
19
20
17
28
29
1
8
4
2
3
9
5
6
7
Chip Power
5-Bit
DAC
2V Reference
PGood / OVP
Shut Down
VSET
SD
Figure 2 - Simplified block diagram of the IRU3055.
SD
P2 Duty Cycle Adj
P3 Duty Cycle Adj
10uA
Master Error Amp
www.irf.com
P1 Ramp
P2 Ramp
P3 Ramp
Oscillator
3-Phase
P1 PWM Comp
P2 PWM Comp
P3 PWM Comp
P1 Set
P1 Ramp
P2 Set
P2 Ramp
P3 Set
P3 Ramp
P1 PWM Latch
P2 PWM Latch
P3 PWM Latch
Reset Dom
Reset Dom
Reset Dom
S
R
S
R
S
R
Q
Q
Q
SD
SD
SD
160uA
16
33
31
32
36
35
34
30
25
26
27
21
22
24
23
08/13/02
Rev. 1.4
HDrv1
LDrv1
HDrv2
HDrv3
OCSet
OCGnd
V
PGnd1
V
LDrv2
PGnd2
LDrv3
PGnd3
V
V
CL1
CL23
CH12
CH3