ir3621 International Rectifier Corp., ir3621 Datasheet - Page 6

• Manufacturer Part Number: ir3621
• Description: 2-phase / Dual Synchronous Pwm Controller With Oscillator Synchronization And Pre-bias Startup
• Manufacturer: International Rectifier Corp.

SS2 / SD
SS1 / SD
Comp1
Comp2
IR3621 & (PbF)
BLOCK DIAGRAM
6
V
V
V
Sync
SEN1
SEN2
POR
Gnd
Fb1
Vcc
Fb2
REF
V
Rt
P2
0.8V
28uA
28uA
0.8V
64uA
64uA
Max
Error Amp1
Error Amp2
Figure 3 - IR3621Block Diagram
Ramp2
Ramp1
Mode
VcH1
VcH2
PGood / OVP
Regulator
PWM Comp1
PWM Comp2
0.8V
Two Phase
SS
Oscillator
www.irf.com
2
Generator
Control
Bias
0.3V
Mode
SS2
Set1
Set2
UVLO
Shutdown
Thermal
Reset Dom
Reset Dom
S
R
R
S
OVP
HDrv OFF / LDrv ON
POR
POR
Q
Q
Mode
POR
3V
0.8V
Mode
SS1
SS2
0.3V
SS1
Control
Hiccup
SS1
S
R
Q
SS2
3uA
3uA
POR
PBias2
PBias1
20uA
20uA
S
R
Q
PBias1
PGnd1
PGnd2
OCSet1
Hiccup
OCSet2
PGood
V
VcH1
V
LDrv1
VcH2
HDrv2
LDrv2
HDrv1
OUT3
CL