MC33033 Datasheet, PDF (5/24 Pages) ON Semiconductor – BRUSHLESS DC MOTOR CONTROLLER

MC33033
Figure 1. Oscillator Frequency versus
Timing Resistor
100
VCC = 20 V
TA = 25°C
10
Figure 2. Oscillator Frequency Change
versus Temperature
4.0
VCC = 20 V
2.0
RT = 4.7 k
CT = 10 nF
0
CT = 100 nF
CT = 10 nF
CT = 1.0 nF
0
1.0
10
100
1000
RT, TIMING RESISTOR (kΩ)
– 2.0
– 4.0
– 55 – 25
0
25
50
75
100 125
TA, AMBIENT TEMPERATURE (°C)
Figure 3. Error Amp Open Loop Gain and
Phase versus Frequency
56
40
48
60
40
80
32
100
Phase
24
120
16
8.0
VCC = 20 V
VO = 3.0 V
0 RL = 15 k
– 8.0
CL = 100 pF
TA = 25°C
–16
– 24
1.0 k
10 k
Gain
100 k
1.0 M
140
160
180
200
220
240
10M
f, FREQUENCY (Hz)
Figure 4. Error Amp Output Saturation
Voltage versus Load Current
0
Vref
– 0.8
Source Saturation
(Load to Ground)
VCC = 20 V
TA = 25°C
–1.6
1.6
0.8
Gnd
Sink Saturation
(Load to Vref)
0
0
1.0
2.0
3.0
4.0
5.0
IO, OUTPUT LOAD CURRENT (mA)
Figure 5. Error Amp Small–Signal
Transient Response
AV = +1.0
3.05
No Load
TA = 25°C
3.0
2.95
1.0 µs/DIV
Figure 6. Error Amp Large–Signal
Transient Response
AV = +1.0
4.5
No Load
TA = 25°C
3.0
1.5
5.0 µs/DIV
MOTOROLA ANALOG IC DEVICE DATA
5