MC44602 Просмотр технического описания (PDF) - ON Semiconductor
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MC44602 Datasheet PDF : 18 Pages
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MC44602
Figure 27. Representative Block Diagram
VCC
VCC
+
Reference
20V
15
Regulator
VCC
14V
Vref
Reference
UVLO
UVLO
16
R
3.6V
Vin
Internal
2.5V R Bias
Demag
Comparator
85mV
Load
+ Detect
Input
Sync Input
7
RT
CT
8
10k
Oscillator
Valid Load
Comparator
R
Q
S
Fault Latch
+
18k
2.5V
TQ
2
VC
14
Source Output
11
Sink Output
Vout
Q1
Compensation
1.0 mA
S
10
1
Voltage Feedback
Error
Amplifier
Thermal
RQ
R
Input 2.5V
PWM
3
2R R
Foldback
Latch
I
Amplifier
Current Sense
Comparator
2.5V
1.0V
Sink Ground
Substrate 4, 5, 12, 13
Current Sense Input
6
RS
Gnd 9
R1
R2
CO
=
Sink Only
Positive True Logic
Figure 28. Timing Diagram
2.8V
Capacitor CT 1.2V
0V
PWM Latch
“Set” Input
Toggle Flip Flop
Q Output
C
Current Sense
C VClamp* C
NC
NC
NC
NC
C
C
NC
Input
PWM Latch
“Set” Input
Source Output
2.5V
Load Detect 85mV
Input
0V
Demag Output
Fault Latch Q
Sync Input
2.5V
0V
Startup With Foldback
Startup Without Foldback
*C = Comparison of Current Sense Input With VClamp
MOTOROLA ANALOG IC DEVICE DATA
Normal Operation
Output Overload
NC = No Comparison of Current Sense Input With VClamp
9
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