MC34067 Datasheet, PDF (4/16 Pages) ON Semiconductor – HIGH PERFORMANCE ZERO VOLTAGE SWITCH RESONANT MODE CONTROLLERS

MC34067 MC33067
Figure 1. Oscillator Timing Resistor
versus Discharge Time
500
COSC = 300 pF
COSC = 200 pF
400
300
COSC = 500 pF
200
100
0
0
VCC = 12 V
RVFO = ∞
RT = ∞
CT = 500 pF
TA = 25°C
Oscillator Discharge Time is Measured at the Drive Outputs.
20
40
60
80
100
tdischg, OSCILLATOR DISCHARGE TIME (µs)
3500
3000
2500
2000
1500
1000
500
0
0
Figure 2. Oscillator Frequency versus
Oscillator Control Current
VCC = 12 V
TA = 25°C
ROSC = 18.2 k
COSC = 300 pF
400
800
1200
1600
2000
IOSC, OSCILLATOR CONTROL CURRENT (mA)
Figure 3. Error Amp Output Saturation
Voltage versus Oscillator Control Current
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
0.5
1.0
1.5
2.0
2.5
3.0
IOSC, OSCILLATOR CONTROL CURRENT (mA)
Figure 4. One–Shot Timing Resistor
versus Period
60
VCC = 12 V
COSC = 500 pF
30 ^{ROSC = 100 k}
TA = 25°C
20
CT = 200 pF
CT = 300 pF
10
CT = 500 pF
400
3.0
0.1
One–Shot Period is Measured
at the Drive Outputs.
0.3
0.6 1.0
3.0
tOS, ONE–SHOT PERIOD (µs)
6.0 10
Figure 5. Open Loop Voltage Gain and Phase
versus Frequency
50
50
40
Gain
VCC = 12 V
VO = 2.0 V
60
RL = 100 k
30
TA = 25°C
70
20
80
10
0
–10
– 20
10 k
Phase
Phase
Margin
= 64°
100 k
1.0M
f, FREQUENCY (Hz)
90
100
110
120
10M
Figure 6. Reference Output Voltage Change
versus Temperature
0 ^{*Vref = 5.0 V}
– 10
– 20
*Vref = 5.0 V
– 30
– 40
VCC = 12 V
RL = ∞
*Vref _at TA = 25°C
– 50
*Vref = 5.0 V
– 55 – 25
0
25
50
75
100 125
TA, AMBIENT TEMPERATURE (°C)
4
MOTOROLA ANALOG IC DEVICE DATA