MC34067 Datasheet, PDF (6/16 Pages) ON Semiconductor – HIGH PERFORMANCE ZERO VOLTAGE SWITCH RESONANT MODE CONTROLLERS

VCC
15
MC34067 MC33067
Figure 13. MC34067 Representative Block Diagram
Enable /
UVLO Adjust ₉
50k
7.0k
50k
7.0k
8.0V
VCC UVLO
5.1V
Vref
Reference
Vref UVLO
OSC Charge
1
ROSC
OSC RC
COSC
2
One–Shot RC
CT RT
Oscillator ¹⁶
Control Current
3
IOSO RVFO
Error Amp Output 6
8
Noninverting Input
Inverting Input ₇
Soft–Start
Error Amp
11
Vref
Q1
D1
Q2
Oscillator
IOSC
4.9V/3.6V
One–Shot
4.9V/3.6V
3.1V
Error Amp
Clamp
9.0µA
4.2/4.0V
Steering
Flip–Flop
Q
T
RQ
QR
S
Fault
Latch
4 Ground
5.1 V
COSC
3. 6 V
One–Shot ^{5.1 V}
3.6 V
Timing Diagram
Vref
5
Output A
14
Power Ground
13
Output B
12
Fault Input
10
1.0V
Output A
Output B
tOS
tOS
tOS
Error Amp output high, minimum IOSC current
occurring at minimum input voltage, maximum load.
6
tOS
tOS
tOS
Error Amp output low, maximum IOSC current
occurring at maximum input voltage, minimum load.
MOTOROLA ANALOG IC DEVICE DATA