MC33470 Datasheet, PDF (5/16 Pages) ON Semiconductor – SYNCHRONOUS RECTIFICATION DC/DC CONVERTER PROGRAMMABLE INTEGRATED CONTROLLER

Figure 1. Output Drive Waveform
VO = 2.8 V
IO = 3.3 A
Figure 13 Circuit
200 nS/DIV
MC33470
Figure 2. 5.0 V Supply Current
8.0
7.0 ^{TA = 25°C}
6.0
5.0
4.0
+ PVCC 12 V
3.0
+ PVCC Open
2.0
1.0
0
0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0
INPUT VOLTAGE (V)
Figure 3. Error Amplifier Transient Response
VO = 2.8 V
0
IO transient = 0.3 to 16 A
Figure 13 Circuit
2.5 mS/DIV
Figure 4. Drive Output Source/Sink Saturation
Voltage versus Load Current
0
PVCC
–0.5
Source Saturation
(Load to Ground)
–1.0
1.0
Sink Saturation
(Load to PVCC )
0.5
0
0
0.2
0.4
0.6
Ground
0.8
1.0
1.2
Figure 5. Feedback Circuit Load
Transient Response
VO = 2.8 V
IO transient = 0.3 to 16 A
Figure 13 Circuit
2.5 mS/DIV
Figure 6. Feedback Loop Gain and Phase
versus Frequency
20
0
VCCP = 12 V
15 ^{VCC = 5.0 V}
VO = 2.8 V
IO = 3.3 A
10 _{TA = 25°C}
Gain
30
Phase
60
5.0
90
0
120
–5.0
150
–10
300
1.0 k 3.0 k
10 k
30 k
f, FREQUENCY (Hz)
180
100 k 300 k
MOTOROLA ANALOG IC DEVICE DATA
5