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Teilenummer | 1200P40 |
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Beschreibung | NCP1200P40 | |
Hersteller | ON Semiconductor | |
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Gesamt 16 Seiten www.DataSheet4U.com
NCP1200
PWM Current−Mode
Controller for Low−Power
Universal Off−Line Supplies
Housed in SOIC−8 or PDIP−8 package, the NCP1200 represents a
major leap toward ultra−compact Switchmode Power Supplies. Due to
a novel concept, the circuit allows the implementation of a complete
offline battery charger or a standby SMPS with few external
components. Furthermore, an integrated output short−circuit
protection lets the designer build an extremely low−cost AC−DC wall
adapter associated with a simplified feedback scheme.
With an internal structure operating at a fixed 40 kHz, 60 kHz or
100 kHz, the controller drives low gate−charge switching devices like
an IGBT or a MOSFET thus requiring a very small operating power.
Due to current−mode control, the NCP1200 drastically simplifies the
design of reliable and cheap offline converters with extremely low
acoustic generation and inherent pulse−by−pulse control.
When the current setpoint falls below a given value, e.g. the output
power demand diminishes, the IC automatically enters the skip cycle
mode and provides excellent efficiency at light loads. Because this
occurs at low peak current, no acoustic noise takes place.
Finally, the IC is self−supplied from the DC rail, eliminating the
need of an auxiliary winding. This feature ensures operation in
presence of low output voltage or shorts.
Features
• No Auxiliary Winding Operation
• Internal Output Short−Circuit Protection
• Extremely Low No−Load Standby Power
• Current−Mode with Skip−Cycle Capability
• Internal Leading Edge Blanking
• 250 mA Peak Current Source/Sink Capability
• Internally Fixed Frequency at 40 kHz, 60 kHz and 100 kHz
• Direct Optocoupler Connection
• Built−in Frequency Jittering for Lower EMI
• SPICE Models Available for TRANsient and AC Analysis
• Internal Temperature Shutdown
• Pb−Free Packages are Available
Typical Applications
• AC−DC Adapters
• Offline Battery Chargers
• Auxiliary/Ancillary Power Supplies (USB, Appliances, TVs, etc.)
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8
1
8
1
SOIC−8
D SUFFIX
CASE 751
PDIP−8
P SUFFIX
CASE 626
MARKING
DIAGRAMS
8
200Dy
ALYW
1
8
1200Pxxx
AWL
YYWW
1
xxx = Device Code: 40, 60 or 100
y = Device Code:
4 for 40
6 for 60
1 for 100
A = Assembly Location
L = Wafer Lot
Y, YY = Year
W, WW = Work Week
PIN CONNECTIONS
Adj 1
FB 2
CS 3
GND 4
8 HV
7 NC
6 VCC
5 Drv
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 14 of this data sheet.
© Semiconductor Components Industries, LLC, 2004
December, 2004 − Rev. 13
1
Publication Order Number:
NCP1200/D
NCP1200
6.50
6.45
6.40
6.35
6.30
6.25
6.20
−25 0 25 50 75 100
TEMPERATURE (°C)
Figure 9. VCC Latchoff vs. Temperature
125
460
430
400
370
340
310
280
250
220
190
−25
0 25 50 75 100
TEMPERATURE (°C)
Figure 10. ICC3 vs. Temperature
125
60
50 Source
40
30
20 Sink
10
1.00
0.96
0.92
0.88
0.84
0
−25 0
25 50 75
TEMPERATURE (°C)
100 125
Figure 11. DRV Source/Sink Resistances
0.80
−25
0
25 50 75
TEMPERATURE (°C)
100 125
Figure 12. Current Sense Limit vs. Temperature
1.34
1.33
1.32
1.31
1.30
1.29
1.28
−25
86.0
84.0
82.0
80.0
78.0
76.0
74.0
0 25 50 75 100 125
−25 0
25 50 75 100 125
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 13. Vskip vs. Temperature
Figure 14. Max Duty Cycle vs. Temperature
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6
6 Page NCP1200
R7
L5
330 mH
C3 +
C2 +
4.7 mF
4.7 mF
400 V
400 V
Universal
Input
R9
10
L6
330 mH
Clamping
Network
Rclamp
NCP1200
1 Adj HV 8
2 FB NC 7
3 CS VCC 6
4 GND Drv 5
Clamp
Dclamp
M1
MTD1N60E
C9
10 mF
+
D3
1N5819
T1
L4
2.2 mH
+
C5
470 mF/
10 V
6.5 V @ 600 mA
+
C10
4.7 mF/
10 V
Snubber
RSnubber
CSnubber
Optional
R2 Networks
220
R6
2.8
IC1
SFH615A−2
D6
5 V1
Figure 24. A typical AC−DC wall adapter showing the reduced part count due to the NCP1200
T1: Lp = 2.9 mH, Np:Ns = 1:0.08, leakage = 80 mH, E16 core, NCP1200P40
To help designers during the design stage, several manufacturers propose ready−to−use transformers for the above
application, but can also develop devices based on your particular specification:
Eldor Corporation Headquarter
Via Plinio 10,
22030 Orsenigo
(Como) Italia
Tel.: +39−031−636 111
Fax : +39−031−636 280
Email: [email protected]
www.eldor.it
ref. 1: 2262.0058C: 3.5 W version
(Lp = 2.9 mH, Lleak = 80 mH, E16)
ref. 2: 2262.0059A: 5 W version
(Lp = 1.6 mH, Lleak = 45 mH, E16)
EGSTON GesmbH
Grafenbergerstrabe 37
3730 Eggenburg
Austria
Tel.: +43 (2984) 2226−0
Fax : +43 (2984) 2226−61
Email: [email protected]
http://www.egston.com/english/index.htm
ref. 1: F0095001: 3.5 W version
(Lp = 2.7 mH, Lleak = 30 mH, sandwich configuration, E16)
Atelier Special de Bobinage
125 cours Jean Jaures
38130 ECHIROLLES FRANCE
Tel.: 33 (0)4 76 23 02 24
Fax: 33 (0)4 76 22 64 89
Email: [email protected]
ref. 1: NCP1200−10 W−UM: 10 W for USB
(Lp = 1.8 mH, 60 kHz, 1:0.1, RM8 pot core)
Coilcraft
1102 Silver Lake Road
Cary, Illinois 60013 USA
Tel: (847) 639−6400
Fax: (847) 639−1469
Email: [email protected]
http://www.coilcraft.com
ref. 1: Y8844−A: 3.5 W version
(Lp = 2.9 mH, Lleak = 65 mH, E16)
ref. 2: Y8848−A: 10 W version
(Lp = 1.8 mH, Lleak = 45 mH, 1:01, E core)
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12
12 Page | ||
Seiten | Gesamt 16 Seiten | |
PDF Download | [ 1200P40 Schematic.PDF ] |
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