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NCP1201
PWM Current−Mode
Controller for Universal
Off−Line Supplies Featuring
Low Standby Power with
Fault Protection Modes
Housed in SOIC−8 or PDIP−8 package, the NCP1201 enhances the
previous NCP1200 series by offering a reduced optocoupler current with
additional Brownout Detection Protection (BOK). Similarly, the circuit
allows the implementation of complete off−line AC−DC adapters, battery
chargers or Switchmode Power Supplies (SMPS) where standby power is
a key parameter.
The NCP1201 features efficient protection circuitry. When in the
presence of a fault (e.g. failed optocoupler, overcurrent condition, etc.)
the control permanently disables the output pulses to avoid subsequent
damage to the system. The IC only restarts when the user cycles the
mains power supply.
With the low power internal structure, operating at a fixed
60 or 100 kHz, the controller supplies itself from the high−voltage rail,
avoiding the need of an auxiliary winding. This feature naturally eases
the designer's task in battery charger applications. Finally, current−mode
control provides an excellent audio−susceptibility and inherent
pulse−by−pulse control.
When the load current falls down to a pre−defined setpoint (V
value, e.g. the output power demand diminishes, the IC automatically
enters the skip cycle mode and can provide excellent efficiency under
light load conditions. The skip mode is designed to operate at relatively
lower peak current so that acoustic noise that commonly takes place will
not happen with NCP1201.
Features
•
AC Line Brownout Detect Protection, BOK Function
•
Latchoff Mode Fault Protection
•
No Auxiliary Winding Operation
•
Internal Output Short−Circuit Protection
•
Extremely Low No−Load Standby Power
•
Current−Mode with Skip−Cycle Capability
•
Internal Overtemperature Shutdown
•
Internal Leading Edge Blanking
•
250 mA Gate Peak Current Driving Capability
•
Internally Fixed Switching Frequency at 60 or 100 kHz
•
Built−in Frequency Jittering for EMI Reduction
•
Direct Optocoupler Connection
•
Pb−Free Packages are Available
Typical Applications
•
AC−DC Adapters
•
Offline Battery Chargers
•
Auxiliary Power Supplies (USB, Appliances, TVs, etc.)
© Semiconductor Components Industries, LLC, 2006
February, 2006 − Rev. 4
8
1
8
1
x
)
SKIP
y
y
xx
A
L
Y, YY
W, WW = Work Week
G or G
BOK
GND
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 17 of this data sheet.
1
http://onsemi.com
MARKING
DIAGRAMS
8
SOIC−8
201Dx
ALYW
D SUFFIX
CASE 751
1
8
PDIP−8
1201Py0
P SUFFIX
CASE 626
YYWWG
1
= Device Code: 6 for 60 kHz
1 for 100 kHz
= Device Code: 6 for 60 kHz
10 for 100 kHz
= Assembly Location
= Wafer Lot
= Year
= Pb−Free Package
PIN CONNECTIONS
1
8
HV
2
7
FB
NC
3
6
VCC
CS
4
5
DRV
(Top View)
Publication Order Number:
NCP1201/D
G
AWL
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Related Manuals for ON Semiconductor NCP1201
Summary of Contents for ON Semiconductor NCP1201
- Page 1 Low Standby Power with Fault Protection Modes http://onsemi.com MARKING Housed in SOIC−8 or PDIP−8 package, the NCP1201 enhances the DIAGRAMS previous NCP1200 series by offering a reduced optocoupler current with additional Brownout Detection Protection (BOK). Similarly, the circuit allows the implementation of complete off−line AC−DC adapters, battery chargers or Switchmode Power Supplies (SMPS) where standby power is SOIC−8...
- Page 2 NCP1201 470 p 100 k 250 V 1.0 W 470 mH 6.5 V, 600 mA 0.2 A 195.7 k 47 mH 1N5819 DF06S 1.0 A − 1N4937 + C5 + C6 90X264 10 m 10 m 4.7 m 4.7 m...
- Page 3 NCP1201 HV Current − − Source 50 mA Output 10.5 V/12.5 V − − − Oscillator 60 or 100 kHz Clock Maximum 83% Output Duty Cycle − − Skip Cycle 1.92 V − Comparator 80 K 1.07 V Output −...
- Page 4 NCP1201 Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á...
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Page 5: Electrical Characteristics
NCP1201 ELECTRICAL CHARACTERISTICS (For typical values T = 25°C, for min/max values T = −25°C to +125°C, = 11 V unless otherwise noted) Characteristic Symbol Unit DYNAMIC SELF−SUPPLY Increasing Level at which the Current Source Turns−Off 11.5 12.5 13.5 Decreasing Level at which the Current Source Turns−On 10.5... -
Page 6: Typical Characteristics
NCP1201 TYPICAL CHARACTERISTICS 12.9 10.8 12.7 10.6 12.5 10.4 12.3 10.2 12.1 11.9 11.7 −25 −25 , JUNCTION TEMPERATURE (°C) , JUNCTION TEMPERATURE (°C) Figure 3. V OFF Threshold Voltage Figure 4. V ON Threshold Voltage vs. Junction Temperature vs. Junction Temperature... - Page 7 NCP1201 TYPICAL CHARACTERISTICS = 0 V −25 −25 , JUNCTION TEMPERATURE (°C) , JUNCTION TEMPERATURE (°C) Figure 9. HV Pin Startup Current Source Figure 10. Leakage Current vs. vs. Junction Temperature Junction Temperature −25 −25 , JUNCTION TEMPERATURE (°C) , JUNCTION TEMPERATURE (°C) Figure 11.
- Page 8 NCP1201 TYPICAL CHARACTERISTICS −25 −25 , JUNCTION TEMPERATURE (°C) , JUNCTION TEMPERATURE (°C) Figure 15. Default Current Setpoint for Skip Cycle Figure 16. Propagation Delay from Current Detection to vs. Junction Temperature Gate Driver vs. Junction Temperature 100 KHz 60 KHz −25...
- Page 9 NCP1201 TYPICAL CHARACTERISTICS 3.40 3.35 3.30 3.25 3.20 3.15 3.10 3.05 3.00 −25 −25 , JUNCTION TEMPERATURE (°C) , JUNCTION TEMPERATURE (°C) Figure 21. FB Pin Pullup Resistor Figure 22. Feedback Pin to Pin 3 Current Setpoint Ratio vs. Junction Temperature vs.
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Page 10: Detailed Operating Description
This later point emphasizes the fact that CCOFF Current Source is ON, output is pulsing ON Semiconductor’s NCP1201 does NOT need an auxiliary Typical values are: V = 12.5 V, V winding to operate: the device is self supplied from the = 10.5 V... - Page 11 Skipping Cycle Mode = 468.3 mW. If a resistor is installed between the mains and The NCP1201 automatically skips switching cycles when the diode, you further force the dissipation to migrate from the output power demand drops below a preset level. This is the package to the resistor.
- Page 12 NCP1201 = 0.4 W = 1.8 W = 3.6 W Figure 30. MOSFET V at Various Power Levels, P1<P2<P3 Max peak current 300.0M 200.0M Skip Cycle current limit 100.0M 315.4uS 2.585mS 882uS 1.450mS 2.017mS Figure 31. The Skip Cycle Takes Place at Low Peak Current...
- Page 13 NCP1201 Brownout Detect Protection BULK In order to avoid output voltage bouncing during electricity brownout, a Bulk Capacitor Voltage Comparator with programmable hysteresis is included in this device. The non−inverting input, pin 1, is connected to the voltage Upper divider comprised of R...
-
Page 14: Application Information
60 kHz version over a 1.0 nF capacitive load. As a the DSS and hence reduce the power consumption down to result, the NCP1201 will dissipate 350 V x 2.1 mA = . By using the auxiliary winding supply method, 735 mW (T = 25_C). - Page 15 NCP1201 As shown below, the fault logic is armed once V crosses ), but in presence of a broken optocoupler, i.e. feedback 10 V after startup phase. When powering the device from an is open, V increases and the fault will never triggered! To auxiliary winding, meeting this condition can sometimes be avoid this problem, the application note “Tips and Tricks...
- Page 16 NCP1201 Protecting the Controller Against Negative fed by its V capacitor and keeps activating the MOSFET Spikes ON and OFF with a peak current limited by Rsense. As with any controller built upon a CMOS technology, it Unfortunately, if the quality coefficient Q of the resonating is the designer’s duty to avoid the presence of negative...
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Page 17: Ordering Information
NCP1201 ORDERING INFORMATION † Device Package Shipping NCP1201P60 PDIP−8 50 Units / Rail NCP1201P60G PDIP−8 (Pb−Free) NCP1201D60R2 SOIC−8 2500 Units / Tape & Reel NCP1201D60R2G SOIC−8 (Pb−Free) NCP1201P100 PDIP−8 50 Units / Rail NCP1201P100G PDIP−8 (Pb−Free) NCP1201D100R2 SOIC−8 2500 Units / Tape & Reel NCP1201D100R2G SOIC−8... -
Page 18: Package Dimensions
0.25 (0.010) 5.80 6.20 0.228 0.244 SOLDERING FOOTPRINT* 1.52 0.060 0.275 0.155 1.270 0.024 0.050 SCALE 6:1 inches *For additional information on our Pb−Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. http://onsemi.com... - Page 19 SEATING PLANE 0.13 (0.005) The product described herein (NCP1201), may be covered by the following U.S. patents: 6,271,735, 6,362,067, 6,385,060, 6,429,709, 6,587,357. There may be other patents pending. ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein.