MC33363A Datasheet, PDF (4/12 Pages) ON Semiconductor – HIGH VOLTAGE OFF-LINE SWITCHING REGULATOR

MC33363A
Figure 3. Oscillator Charge/Discharge
Current versus Timing Resistor
0.8
VCC = 20 V
TA = 25°C
0.5
Figure 4. Maximum Output Duty Cycle
versus Timing Resistor Ratio
70
RD/RT Ratio
Discharge Resistor
Pin 6 to Gnd
60
VCC = 20 V
CT = 2.0 nF
TA = 25°C
0.3
0.2
0.15
0.1
0.08
7.0
10
15 20
30
RT, TIMING RESISTOR (kΩ)
50
70
50
40
RC/RT Ratio
Charge Resistor
Pin 6 to Vreg
30
1.0
2.0
3.0
5.0 7.0
10
TIMING RESISTOR RATIO
Figure 5. Error Amp Open Loop Gain and
Phase versus Frequency
100
0
VCC = 20 V
80
VO = 1.0 to 4.0 V
RL = 5.0 MΩ
30
Gain
CL = 2.0 pF
60
TA = 25°C
60
Phase
40
90
20
120
0
150
–20
10
180
100
1.0 k 10 k 100 k 1.0 M 10 M
f, FREQUENCY (Hz)
Figure 6. Error Amp Output Saturation
Voltage versus Load Current
0
–1.0
Source Saturation
Vref
(Load to Ground)
– 2.0
2.0
1.0
Sink Saturation
(Load to Vref)
VCC = 20 V
TA = 25°C
Gnd
0
0
0.2
0.4
0.6
0.8
1.0
IO, OUTPUT LOAD CURRENT (mA)
1.80 V
Figure 7. Error Amplifier Small Signal
Transient Response
VCC = 20 V
AV = –1.0
CL = 10 pF
TA = 25°C
1.75 V
1.70 V
1.0 µs/DIV
3.00 V
Figure 8. Error Amplifier Large Signal
Transient Response
VCC = 20 V
AV = –1.0
CL = 10 pF
TA = 25°C
1.75 V
0.50 V
1.0 µs/DIV
4
MOTOROLA ANALOG IC DEVICE DATA