iru3138 International Rectifier Corp., iru3138 Datasheet - Page 4

• Manufacturer Part Number: iru3138
• Description: Synchronous Pwm Controller For Termination Power Supply Applications -
• Manufacturer: International Rectifier Corp.

IRU3138
BLOCK DIAGRAM
4
SS/SD
POR
Comp
V
Vcc
REF
V
Fb
P
13
12
4
3
2
1
3V
0.8V
20uA
25K
25K
1.25V
64uA Max
4.25V
3.5V
Figure 2 - Simplified block diagram of the IRU3138.
Vc
Error Amp
0.2V
0.25V
0.4V
www.irf.com
Generator
Rt
Ct
Bias
Oscillator
FbLo Comp
Error Comp
POR
3V
1.25V
POR
Reset Dom
S
R
Q
2.8V
SS
Vcc
10
11
6
9
8
7
01/29/04
Rev. 1.0
LDrv
Rt
Vc
HDrv
PGnd
Gnd