MC44603 Datasheet, PDF (5/24 Pages) ON Semiconductor – MIXED FREQUENCY MODE GREENLINE PWM CONTROLLER

MC44603
Representative Block Diagram
RF _Stby
Rref
RF _Stby 15 16 Vref
Negative
R
Active
Q
Clamp
S
UVLO2
Demag
Detect
8
+
65 mV
+
Sync
3.7 V
Input
9
Vref
0.4 Iref
+
0.7 V
VDemag _Out
Synchro
VOSC _prot
Reference
Block
+
VCC
14.5 V/7.5 V
Vref Iref IF _Stby
18.0 V
1.0 V
1.6 V
CT
10
+
R
Q
R
S
Q
S
CT
3.6 V
VOSC
S
RPwr _Stby
12
Feed–
back
14
0.4 Iref
Vref Vref
0.4 Iref
0.6 Iref
Vref
0.8 Iref
IDischarge
Vref
Vref
0.25
IF _{Stby 0.2 Iref}
VCC
1.0 mA
IDischarge/2
2R
Current Mirror X2
Q
R
Thermal
Shutdown
Vref
0.4 Iref
2.0 µs
Delay
Vref
5.0 µs
Delay
+
1.6 V
+ _{2.5 V}
VOVP
Out
Vref
VCC
11.6 k
2.0 k
+
Compen–
2.5 V
sation
Error Amplifier
13
5
Foldback
Input
1.0 V
UVLO1
2.4 V
5.0 mA
VCC
+ _{9.0 V}
VCC
1
Vaux
To Power
Transforme
VC
2
Output
3
4
Gnd
OVP
6
ROVP
Current
Sense Input
7
= Sink only
= Positive True Logic
11 SS/Dmax/VM
RSS
CSS
This device contains 243 active transistors.
MOTOROLA ANALOG IC DEVICE DATA
5