iru3072 International Rectifier Corp., iru3072 Datasheet - Page 5

• Manufacturer Part Number: iru3072
• Description: 20-pin Synchronous Pwm Controller/ 3 Ldo Controller -
• Manufacturer: International Rectifier Corp.

BLOCK DIAGRAM
Rev. 1.0
3/25/04
V
SEN33
VccLDO
POR
OCSet
SS
/ SDB
Comp
3V
SS1
Fb1
Fb2
Fb3
Fb4
0.8V
LDO
3V
12
17
16
15
14
11
18
19
20
4
20uA
25K
25K
25K
25K
25K
20uA
CS Comp
64uA
Max
20uA
Figure 2 - Simplified block diagram of the IRU3072.
64uA
Max
64uA
3
When SS=0
64uA
Max
25K=1.6V
Error Amp
64uA
Max
www.irf.com
0.8V
VccLDO
0.4V
Vcc
Vc
Rt
Ct
1.27V / 1.2V
2.5V / 2.35V
4.2V / 4.0V
3.5V / 3.3V
Error Comp
FbLo Comp
Oscillator
Enbl
UVLO
Generator
Bias
POR
Reset Dom
S
R
Q
POR
3V
1.27V
0.8V
IRU3072
13
10
6
9
5
8
7
3
2
1
Rt
LDrv
Vc
PGnd
Gnd
HDrv
Vcc
Drv2
Drv3
Drv4
5