NCP1550D ON, NCP1550D Datasheet - Page 15

• Manufacturer Part Number: NCP1550D
• Description: 600 kHz PWM/PFM Step-Down DC-DC Controller
• Manufacturer: ON

aluminum−electrolytic capacitors are acceptable and
relatively inexpensive. For even better performance, Low
ESR tantalum capacitors should be used. Surface−mount
tantalum capacitors are better and provide neat and compact
solution for space sensitive applications.
PCB Layout Recommendations
mode power conversion. Careful PCB layout can help to
minimize ground bounce, EMI noise and unwanted
feedbacks that can affect the performance of the converter.
Suggested hints below can be used as a guideline in most
situations.
Grounding
output power return ground, the input power return ground
and the device power ground together at one point. All high
current running paths must be thick enough for current
External Component Reference Data
NCP1550SN18T1
NCP1550SN19T1
NCP1550SN25T1
NCP1550SN27T1
NCP1550SN30T1
NCP1550SN33T1
Good PCB layout plays an important role in switching
Star−ground connection should be used to connect the
Device
V
1.8 V
1.9 V
2.5 V
2.7 V
3.0 V
3.3 V
OUT
CDD5D23
CDRH6D38 6R8 (2A)
Sumida
CDC5D23
CDRH6D38 6R8 (2A)
Sumida
CDC5D23
CDRH6D38 5R0 (2A)
Sumida
CDC5D23
CDRH6D38 5R0 (2A)
Sumida
CDC5D23
CDRH6D28 5R0 (2A)
Sumida
CD43
CDRH6D38 3R3 (2A)
Sumida
Inductor Model
6R8 (1A)
6R8 (1A)
5R6 (1A)
5R6 (1A)
4R7 (1A)
3R3 (1A)
Inductor
6.8 mH
6.8 mH
5.6 mH
5.0 mH
5.6 mH
5.0 mH
5.6 mH
5.0 mH
3.3 mH
http://onsemi.com
(L)
NCP1550
15
External MOSFET
NTGS3441T1 (1A)
NTGS3443T1 (2A)
ON Semiconductor
NTGS3441T1 (1A)
NTGS3443T1 (2A)
ON Semiconductor
NTGS3441T1 (1A)
NTGS3443T1 (2A)
ON Semiconductor
NTGS3441T1 (1A)
NTGS3443T1 (2A)
ON Semiconductor
NTGS3441T1 (1A)
NTGS3443T1 (2A)
ON Semiconductor
NTGS3441T1 (1A)
NTGS3443T1 (2A)
ON Semiconductor
flowing through and producing insignificant voltage drop
along the path. Feedback signal path must be separated from
the main current path and sensing directly at the anode of the
output capacitor.
Components Placement
output capacitor, must be placed as close together as
possible. All connecting traces must be short, direct and
thick. High current flowing and switching paths must be
kept away from the feedback (V
unwanted injection of noise into the feedback path.
Feedback Path
separated from the power path. The output voltage sensing
trace to the feedback (V
to the output voltage directly at the anode of the output
capacitor.
Power components, i.e. input capacitor, inductor and
Feedback of the output voltage must be a separate trace
(M)
MBRM120LT3
ON Semiconductor
MBRM120LT3
ON Semiconductor
MBRM120LT3
ON Semiconductor
MBRM120LT3
Semiconductor
MBRM120LT3
ON Semiconductor
MBRM120LT3
ON Semiconductor
OUT
Diode
(SD)
, pin 3) pin should be connected
OUT
, pin 3) terminal to avoid
33 mF/33 mF (1A)
68 mF/33 mF (2A)
KEMET
(T494 series)
33 mF/33 mF (1A)
68 mF/33 mF (2A)
KEMET
(T494 series)
33 mF/33 mF (1A)
68 mF/33 mF (2A)
KEMET
(T494 series)
33 mF/33 mF (1A)
68 mF/33 mF (2A)
KEMET
(T494 series)
33 mF/33 mF (1A)
68 mF/33 mF (2A)
KEMET
(T494 series)
68 mF/33 mF (1A)
100 mF/68 mF (2A)
KEMET
(T494 series)
Output and Input
Capacitor
C
OUT
/C
IN