MC33023 Motorola, MC33023 Datasheet - Page 7

• Manufacturer Part Number: MC33023
• Description: High Speed Single-Ended PWM Controller
• Manufacturer: Motorola

Error Amp Output
MOTOROLA ANALOG IC DEVICE DATA
Comparator
Soft–Start
Output
Ramp
Clock
PWM
R T
C T
Noninverting Input
Error Amp Output
C T
Inverting Input
Soft–Start
Ramp
C SS
Clock
V ref
16
4
5
6
7
3
2
1
8
1.25 V
Error
Amp
Oscillator
Figure 19. Current Limit Operating Waveforms
Figure 18. Representative Block Diagram
+
Comparator
9.0 A
Q
PWM
R
S
4.2 V
MC34023 MC33023
UVLO
V ref
Soft–Start Latch
10
Reference
Regulator
Ground
0.5 V
PWM Latch
R
S
UVLO
V CC
9.2 V
Q
Shutdown
Current
Limit
1.4 V
12
15
11
9
13
14
Output
V CC
V C
Current Limit Reference
Current Limit/Shutdown
Power Ground
V CC
V in
7