MC33363B 查看數據表（PDF） - ON Semiconductor
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MC33363B Datasheet PDF : 11 Pages
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MC33363B
1.0 M
CT = 100 pF
500 k CT = 200 pF
200 k CT = 500 pF
100 k CT = 1.0 nF
50 k CT = 2.0 nF
VCC = 20 V
TA = 25C
20 k CT = 5.0 nF
10 k CT = 10 nF
7.0
10
15 20
30
RT, TIMING RESISTOR (kΩ)
50
70
Figure 2. Oscillator Frequency
versus Timing Resistor
1.0
0.8
VCC = 20 V
CT = 1.0 mF
0.6
TA = 25C
0.4
0.3
0.2
0.15 Inductor supply voltage and inductance value are
adjusted so that Ipk turn--off is achieved at 5.0 ms.
0.1
7.0
10
15 20
30 40 50
70
RT, TIMING RESISTOR (kΩ)
Figure 3. Power Switch Peak Drain Current
versus Timing Resistor
0.8
VCC = 20 V
TA = 25C
0.5
0.3
0.2
0.15
0.1
0.08
7.0
10
15 20
30
RT, TIMING RESISTOR (kΩ)
50
70
Figure 4. Oscillator Charge/Discharge
Current versus Timing Resistor
70
RD/RT Ratio
Discharge Resistor
Pin 7 to GND
60
VCC = 20 V
CT = 2.0 nF
TA = 25C
50
40
RC/RT Ratio
Charge Resistor
Pin 7 to Vreg
30
1.0
2.0
3.0
5.0
7.0
10
TIMING RESISTOR RATIO
Figure 5. Maximum Output Duty Cycle
versus Timing Resistor Ratio
100
80
Gain
60
Phase
40
0
VCC = 20 V
VO = 1.0 to 4.0 V
RL = 5.0 MΩ
30
CL = 2.0 pF
TA = 25C
60
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 Open Loop Gain and
Phase versus Frequency
0
--1.0
Source Saturation
Vref
(Load to Ground)
-- 2.0
2.0
1.0
Sink Saturation
(Load to Vref)
VCC = 20 V
TA = 25C
GND
0
0
0.2
0.4
0.6
0.8
1.0
IO, OUTPUT LOAD CURRENT (mA)
Figure 7. Error Amp Output Saturation
Voltage versus Load Current
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