NCP1578 Datasheet, PDF (10/22 Pages) ON Semiconductor – Synchronous Step-Down Controller with 50 mA Linear Regulator

3.350
NCP1578
TYPICAL OPERATING CHARACTERISTICS
3.350
3.325
3.300
3.275
I_o = 0 A
I_o = 5 A
3.325
3.300
3.275
V_o = 24 V
V_o = 6 V
3.250
5
10
15
20
25
V_in, INPUT VOLTAGE (V)
Figure 16. V_o Output Voltage vs. Input Voltage
3.250
0.5
1.5
2.5
3.5
4.5
I_o, OUTPUT CURRENT (A)
Figure 17. V_o Output Voltage vs. Output
Current
100
V_in = 6 V
90
V_in = 12 V
V_in = 24 V
80
V_o = 3.3 V
70
F_SW = 300 kHz
T_A = 25°C
60
50
0.1
With Power Saving
Without Power Saving
1
10
I_o, OUTPUT CURRENT (A)
Figure 18. V_o Efficiency vs. Output Current
(Single Supply)
100
V_in = 6 V
90
V_in = 12 V
V_in = 24 V
80
V_BAT = +5.0 V
70
V_o = 3.3 V
F_SW = 300 kHz
T_A = 25°C
60
50
0.1
With Power Saving
Without Power Saving
1
10
I_o, OUTPUT CURRENT (A)
Figure 19. V_o Efficiency vs. Output Current
(Separate Supply)
Figure 20. Power Up Sequence
Figure 21. Power Down Sequence
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