ncp3155a ON Semiconductor, ncp3155a Datasheet - Page 6

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

Input = 12 V, Output = 1.8 V, Load = 2 A,
CH3 (Purple) = V
CH3: 200 mVac/div; CH2: 50 mVac/div; CH1: 5.0 V/div
Time Scale: 1.0 ms/div; Figure 46
1.48
1.46
1.44
1.42
1.38
1.36
1.34
1.32
570
560
550
540
500
490
480
470
460
430
530
520
510
450
440
Figure 9. Switching Waveforms (NCP3155B)
1.5
1.4
1.3
−40 −25 −10
−40 −25 −10
Figure 13. Transconductance vs Temperature
Figure 11. Switching Frequency vs Input
IN
, (CH2) Green = V
Voltage and Temperature
V
5
5
in
= 12 V − 24 V
TEMPERATURE (°C)
TEMPERATURE (°C)
V
20
20
in
= 4.7 V
35
35
OUT
TYPICAL PERFORMANCE CHARACTERISTICS
50
50
, CH1 (Yellow) = VSW
65
65
80
80
NCP3155A
95 110 125
95
http://onsemi.com
110 125
6
1120
1100
1080
1060
1000
1040
1020
808
806
804
802
800
798
796
794
792
980
960
940
920
900
880
860
4.5
4.4
4.3
4.2
4.1
3.9
3.8
3.7
3.6
3.5
−40 −25 −10
4
−40 −25 −10
40
Figure 14. Input Undervoltage vs Temperature
Figure 10. Feedback Reference Voltage vs
25
Figure 12. Switching Frequency vs Input
10
Voltage and Temperature
5
5
5
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
UVLO Falling
V
UVLO Rising
20
20
20
Temperature
in
= 12 V − 24 V
V
35
35
35
in
= 4.7 V
50
50
50
65
65
65
80
80
80
NCP3155B
95 110 125
95
95
110 125
110 125