ncp3155a ON Semiconductor, ncp3155a Datasheet - Page 5

• Manufacturer Part Number: ncp3155a
• Description: Ncp3155a, Ncp3155b 3 A Synchronous Buck Regulator
• Manufacturer: ON Semiconductor

Input = 12 V, Output = 5.0 V, Load = 2 A,
CH3 (Purple) = V
CH3: 200 mVac/div; CH2: 50 mVac/div; CH1: 5.0 V/div
Time Scale: 2.0 ms/div; Figure 45
100
100
90
80
70
60
50
40
30
20
10
90
80
70
60
50
40
30
20
10
Figure 7. Switching Waveforms (NCP3155A)
0
0
0
0
Figure 5. Efficiency vs Output Current and Input
V
Figure 3. Efficiency vs Output Current and
out
V
in
= 5.0 V
0.5
0.5
= 12 V
V
3.3 V
1.5 V
in
IN
= 18 V
V
, (CH2) Green = V
in
I
I
out
out
1.2 V
= 24 V
, OUTPUT CURRENT (A)
, OUTPUT CURRENT (A)
1
1
Output Voltage
Voltage
1.5
1.5
NCP3155A, V
Typical Application Circuit
Figure 45
NCP3155A, V
Typical Application Circuit
Figure 45
OUT
TYPICAL PERFORMANCE CHARACTERISTICS
, CH1 (Yellow) = VSW
2
2
in
out
= 12 V
2.5
= 5 V
2.5
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3
3
5
5.08
5.08
5.06
5.06
5.04
5.04
5.02
5.02
4.98
4.98
4.96
4.96
4.94
4.92
100
5.1
5.1
4.9
90
80
70
60
50
40
30
20
10
0
5
5
Input = 18 V, Output = 5.0 V, Load = 2 A,
CH3 (Purple) = V
CH3: 200 mVac/div; CH2: 50 mVac/div; CH1: 5.0 V/div
Time Scale: 2.0 ms/div; Figure 45
0
0
Figure 8. Switching Waveforms (NCP3155A)
NCP3155A, V
Typical Application Circuit
Figure 45
Figure 6. Load Regulation vs Input Voltage
Figure 4. Efficiency vs Output Current and
V
out
0.4
0.5
= 5.0 V
3.3 V
1.5 V
I
0.8
I
out
IN
out
out
, (CH2) Green = V
1.2 V
, OUTPUT CURRENT (A)
, OUTPUT CURRENT (A)
1
= 5 V
Output Voltage
1.2
1.5
NCP3155B, V
Typical Application Circuit
Figure 45
V
in
1.6
= 12 V
V
OUT
in
2
2.0
= 18 V
, CH1 (Yellow) = VSW
in
= 12 V
V
in
2.4
2.5
= 24 V
2.8
3