MC34025 ON Semiconductor, MC34025 Datasheet - Page 7

• Manufacturer Part Number: MC34025
• Description: (MC33025 / MC34025) High Speed Single-Ended PWM Controller
• Manufacturer: ON Semiconductor

Error Amp Output
Comparator
Soft−Start
R
Output A
Output B
T
Ramp
Noninverting Input
Clock
Error Amp Output
PWM
C
C
Inverting Input
T
T
Soft−Start
C
Ramp
SS
Clock
V
ref
16
4
5
6
7
3
2
1
8
1.25 V
Error
Amp
Oscillator
Comparator
PWM
Figure 20. Current Limit Operating Waveforms
+
Figure 19. Representative Block Diagram
9.0 mA
Q
R
S
4.2 V
Soft−Start Latch
MC34025, MC33025
http://onsemi.com
UVLO
V
PWM Latch
ref
10
Reference
Regulator
R
S
Q
Ground
7
0.5 V
Steering
Flip Flop
T
9.2 V
UVLO
Q
Q
V
CC
Shutdown
Current
Limit
1.0 V
1.4 V
15
13
14
11
12
9
V
V
Output B
Output A
Current Limit/
Shutdown
CC
C
Power Ground
V
CC
V
in