iru3048 International Rectifier Corp., iru3048 Datasheet - Page 4

• Manufacturer Part Number: iru3048
• Description: Dual Synchronous Pwm Controller Circuitry And Ldo Controller
• Manufacturer: International Rectifier Corp.

IRU3048
BLOCK DIAGRAM
4
C o m p 1
C o m p 2
P O R
Gnd
Fb1
Fb2
Fb3
V c c
SS
15
16
14
9
3
2
4
1
1.25V
1.25V
1.25V
25uA
25K
25K
25K
25K
25K
25K
40mA LDO Controller
64uA Max
Error Amp1
Error Amp2
Figure 2 - Block diagram of the IRU3048.
Vcc
Ramp1
Ramp2
V c H 1
V c H 2
www.irf.com
PWM Comp1
PWM Comp2
4.2V / 4.0V
3.5V / 3.3V
3.5V / 3.3V
Two Phase
Oscillator
0.5V
Generator
Bias
Set1
Set2
UVLO
Reset Dom
Reset Dom
R
S
S
R
P O R
Q
Q
3V
1.25V
P O R
SS
2V
SS > 2V
10
12
11
13
09/12/02
5
6
7
8
Rev. 1.7
V c H 1
HDrv1
V c H 2
LDrv2
P G n d
V
LDrv1
HDrv2
OUT3