MC33470_06 Datasheet, PDF (5/15 Pages) ON Semiconductor – Synchronous Rectification DC/DC Converter Programmable Integrated Controller

V_O = 2.8 V
I_O = 3.3 A
Figure 14 Circuit
200 nS/DIV
Figure 2. Output Drive Waveform
MC33470
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. 5.0 V Supply Current
V_O = 2.8 V
0
I_O transient = 0.3 to 16 A
Figure 14 Circuit
2.5 mS/DIV
Figure 4. Error Amplifier Transient Response
0
−0.5
Source Saturation
(Load to Ground)
−1.0
PVCC
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. Drive Output Source/Sink Saturation
Voltage versus Load Current
V_O = 2.8 V
I_O transient = 0.3 to 16 A
Figure 14 Circuit
2.5 mS/DIV
Figure 6. Feedback Circuit Load
Transient Response
20
V_CCP = 12 V
15 ^{VCC = 5.0 V}
V_O = 2.8 V
I_O = 3.3 A
10 _{TA = 25°C}
5.0
0
Gain
30
Phase
60
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
Figure 7. Feedback Loop Gain and Phase
versus Frequency
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