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PDF NCP1015 Data sheet ( Hoja de datos )
| Número de pieza | NCP1015 | |
| Descripción | Self-Supplied Monolithic Switcher | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de NCP1015 (archivo pdf) en la parte inferior de esta página. Total 22 Páginas | ||
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NCP1015
Self-Supplied Monolithic
Switcher for Low Standby-
Power Offline SMPS
The NCP1015 integrates a fixed−frequency current−mode
controller and a 700 V voltage MOSFET. Housed in a PDIP−7 or
SOT−223 package, the NCP1015 offers everything needed to build a
rugged and low−cost power supply, including soft−start, frequency
jittering, short−circuit protection, skip−cycle, a maximum peak
current set−point and a Dynamic Self−Supply (no need for an auxiliary
winding).
Unlike other monolithic solutions, the NCP1015 is quiet by nature:
during nominal load operation, the part switches at one of the available
frequencies (65−100 kHz). When the current set−point falls below a
given value, e.g. the output power demand diminishes, the IC
automatically enters the so−called skip cycle mode and provides
excellent efficiency at light loads. Because this occurs at typically 0.25
of the maximum peak value, no acoustic noise takes place. As a result,
standby power is reduced to the minimum without acoustic noise
generation.
Short−circuit detection takes place when the feedback signal fades
away e.g. un−true short−circuit or is broken optocoupler cases. Finally
soft−start and frequency jittering further ease the designer task to
quickly develop low−cost and robust offline power supplies.
For improved standby performance, the connection of an auxiliary
winding stops the DSS operation and helps to consume less than
100 mW at high line.
Features
• Built−in 700 V MOSFET with typical RDS(on) of 11 W
• Large Creepage Distance between High−voltage Pins
• Current−mode Fixed Frequency Operation: 65 kHz − 100 kHz
• Skip−cycle Operation at Low Peak Currents Only: No Acoustic Noise!
• Dynamic Self−Supply, No Need for an Auxiliary Winding
• Internal 1 ms Soft−start
• Auto−recovery Internal Output Short−circuit Protection
• Frequency Jittering for Better EMI Signature
• Below 100 mW Standby Power if Auxiliary Winding is Used
• Internal Temperature Shutdown
• Direct Optocoupler Connection
• SPICE Models Available for TRANsient and AC Analysis
• This is a Pb−Free Device
Typical Applications
• Low Power ac−dc Adapters for Chargers
• Auxiliary Power Supplies (USB, Appliances, TVs, etc.)
http://onsemi.com
MARKING
DIAGRAMS
8
1
PDIP−7
CASE 626A
AP SUFFIX
P1015APyy
AWL
YYWWG
1
4
4 SOT−223
CASE 318E
1 ST SUFFIX
AYW
1015y G
G
1
yy
y
A
WL
YY
WW
G or G
= 06 (65 kHz), 10 (100 kHz)
= A (65 kHz), B (100 kHz)
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
(*Note: Microdot may be in either location)
PIN CONNECTIONS
PDIP−7
VCC 1
NC 2
8 GND
7 GND
GND 3
FB 4
5 DRAIN
(Top View)
SOT−223
VCC 1
FB 2
4 GND
DRAIN 3
(Top View)
© Semiconductor Components Industries, LLC, 2011
March, 2011 − Rev. 3
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 20 of this data sheet.
1 Publication Order Number:
NCP1015/D
1 page  
NCP1015
TYPICAL CHARACTERISTICS
−2
−3
−4
−5
−6
−7
−8
−9
−10
−11
−12
−40 −20
0 20 40 60 80
TEMPERATURE (°C)
100 120
Figure 3. IC1 @ VCC = 8.0 V, FB = 1.5 V
vs. Temperature
0.40
0.38
0.36
0.34
0.32
0.30
0.28
0.26
0.24
0.22
0.20
−40
−20 0 20 40 60 80 100 120
TEMPERATURE (°C)
Figure 5. ICC2 @ VCC = 6.0 V, FB = Open
vs. Temperature
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
−40 −20
0 20 40 60 80
TEMPERATURE (°C)
100 120
Figure 4. ICC1 @ VCC = 8.0 V, FB = 1.5 V
vs. Temperature
9.0
8.9
8.8
8.7
8.6
8.5
8.4
8.3
8.2
−40 −20 0 20 40 60 80 100 120
TEMPERATURE (°C)
Figure 6. VCC OFF, FB = 1.5 V vs. Temperature
http://onsemi.com
5
5 Page 
VCC(off) = 8.5 V
VCC(on) = 7.5 V
+-
+
+
+−
NCP1015
Drain
Startup Source
VCC Rlimit
D1
++
CVCC
CAux
Laux
Ground
Figure 17. A Detailed View of the NCP1015 with Properly Connected Auxiliary Winding
u30 ms
Figure 18. The Burst Frequency becomes So Low that it is Difficult to
Keep an Adequate Level on the Auxiliary VCC
Lowering the Standby Power with Skip−cycle
Skip cycle offers an efficient way to reduce the standby
power by skipping unwanted cycles at light loads. However,
the recurrent frequency in skip often enters the audible range
and a high peak current obviously generates acoustic noise
in the transformer. The noise takes its origins in the
resonance of the transformer mechanical structure which is
excited by the skipping pulses. A possible solution,
successfully implemented in the NCP1200 series, also
authorizes skip cycle but only when the power demand as
dropped below a given level. At this time, the peak current
is reduced and no noise can be heard. Figure 19 shows the
peak current evolution of the NCP1015 entering standby:
http://onsemi.com
11
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet NCP1015.PDF ] | |
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