ncp1509 ON Semiconductor, ncp1509 Datasheet - Page 8

• Manufacturer Part Number: ncp1509
• Description: Up To 500 Ma, 1 Mhz, High Efficiency Synchronous Step-down Dc-dc Converter In Dfn Package
• Manufacturer: ON Semiconductor

1.5
0.5
2
1
0
Figure 18. Light−Load PWM Switching Waveform
0
Figure 20. Pulsed Mode Switching Waveform
V
V
PWM
T
Figure 16. Output Voltage vs. Shutdown Pin
A
out
in
= 25°C
= 3.6 V
= 1.5 V
(V
(V
0.2
in
in
= 3.6 V, V
= 3.6 V, V
0.4
out
out
0.6
Voltage
V
SHD
= 1.8 V, I
= 1.8 V, I
1 ms/div
1 ms/div
(V)
0.8
out
out
1.0
= 30 mA)
= 30 mA)
1.2
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1.4
8
1.5
0.5
Figure 19. Heavy−Load PWM Switching Waveform
2
1
0
0
V
V
PWM
T
A
out
in
(V
= 25°C
= 3.6 V
Figure 17. Transition Level of CB Pins
(V
= 1.5 V
0.2
in
in
= 3.6 V, V
= 3.6 V, V
0.4
Figure 21. Soft−Start
out
out
0.6
= 1.8 V, I
V
= 1.8 V, I
CB
1 ms/div
(V)
0.8
out
out
= 300 mA)
1.0
= 150 mA)
1.2
1.4