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UVLO Adjust
OSC Charge
R
OSC
C
OSC
One-Shot RC
R
C
T
T
Control Current
I
Error Amp Output
Noninverting Input
Inverting Input
5.1 V
C
OSC
3. 6 V
5.1 V
One-Shot
3.6 V
Output A
Output B
Downloaded from
Elcodis.com
electronic components distributor
V
CC
15
50k
7.0k
Enable /
9
50k
1
OSC RC
2
I
OSC
16
Oscillator
3
R
OSC
VFO
6
8
7
Error Amp
Soft-Start
11
Figure 14. MC34067 Representative Block Diagram
t
t
OS
OS
High State Error Amp output, minimum I
occurring at minimum input voltage, maximum load.
MC34067, MC33067
7.0k
5.1 V
Reference
V
UVLO
CC
8.0 V
V
ref
D1
Q1
Q2
Oscillator
4.9V/3.6 V
One-Shot
4.9 V/3.6 V
3.1V
Error Amp
9.0 mA
Clamp
4
Ground
t
OS
current
OSC
Figure 15. Timing Diagram
http://onsemi.com
7
V
ref
V
UVLO
ref
4.2/4.0 V
Steering
Flip-Flop
Q
T
Q
R
Fault Comparator
R
Q
S
1.0 V
Fault
Latch
t
t
t
OS
OS
OS
Low State Error Amp output, maximum I
occurring at maximum input voltage, minimum load.
V
ref
5
14
Output A
Power
13
Ground
Output B
12
Fault Input
10
current
OSC
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