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Details, datasheet, quote on part number:NCP1205DR2
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| Part: | NCP1205DR2 |
| Category: | Power Management => AC-DC Controllers/Converters => AC-DC Switching => Off-Line Controllers |
| Description: | Variable-frequency Quasi-resonant Flyback Current-mode Controller With 500V Maximum Startup, Frequency Foldback For Standby And Ovp, Package: Soic, Pins=16 |
| Company: | ON Semiconductor |
| Datasheet: | Download NCP1205DR2 datasheet File size : 175 kB |
| Request For quote: | Find where to buy NCP1205DR2
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Datasheet text preview:
NCP1205 Single Ended PWM Controller Featuring QR Operation and Soft Frequency Foldback
The NCP1205 combines a true Current Mode Control modulator and a demagnetization detector to ensure full Discontinuous Conduction Mode in any load/line conditions and minimum drain voltage switching (Quasi-Resonant operation, also called critical conduction operation). With its inherent Variable Frequency Mode (VFM), the controller decreases its operating frequency at constant peak current whenever the output power demand diminishes. Associated with automatic multiple valley switching, this unique architecture guarantees minimum switching losses and the lowest power drawn from the mains when operating at no-load conditions. Thus, the NCP1205 is optimal for applications targeting the newest International Energy Agency (IEA) recommendations for standby power. The internal High-Voltage current source provides a reliable charging path for the VCC capacitor and ensures a clean and short start-up sequence without deteriorating the efficiency once off. The continuous feedback signal monitoring implemented with an Over-Current fault Protection circuitry (OCP) makes the final design rugged and reliable. The DIP14 offers an adjustable version of the OVP threshold via an external resistive network.
Features http://onsemi.com MARKING DIAGRAMS
8 PDIP-8 N SUFFIX CASE 626 1 1 NCP1205P AWL YYWW
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14 PDIP-14 P SUFFIX CASE 646 1 1 16 SO-16 D SUFFIX CASE 751B 1 A WL YY WW 1 = Assembly Location = Wafer Lot = Year = Work Week 1205 AWLYYWW NCP1205P2 AWLYYWW
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· Natural Drain Valley Switching for Lower EMI and Quasi-Resonant · · · · · · · · · · · · · · ·
Operation (QR) Smooth Frequency Foldback for Low Standby and Minimum Ripple at Light-Load Adjustable Maximum Switching Frequency Internal 200 ns Leading Edge Blanking on Current Sense 250 mA Sink and Source Driver Wide Operating Voltages: 8.0 to 30 V Wide UVLO Levels: 7.2 to 15 V Typical Auto-Recovery Internal Short-Circuit Protection (OCP) Integrated 3.0 mA Typ. Start-Up Source Current Mode Control Adjustable Over-Voltage Level Available in DIP8, DIP14 and SO16 Packages High Power AC/DC Adapters for Notebooks, etc. Offline Battery Chargers Power Supplies for DVD, CD Players, TVs, Set-Top Boxes, etc. Auxiliary Power Supplies (USB, Appliances, etc.)
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ORDERING INFORMATION
Device NCP1205P NCP1205P2 NCP1205DR2 Package PDIP-8 PDIP-14 SO-16 Shipping 50 Units/Rail 25 Units/Rail 2400/Tape & Reel
Applications
© Semiconductor Components Industries, LLC, 2003
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July, 2003 - Rev. 3
Publication Order Number: NCP1205/D
NCP1205
PIN CONNECTIONS
HV HV 1 NC 2 Demag 3 HV 1 Demag 2 FB 3 Ct 4 PDIP-8 8 VCC 7 Drive 6 Isense 5 GND FB 4 Ct 5 OVP 6 NC 7 PDIP-14 14 NC 13 VCC 12 Drive 11 Isense 10 GND 9 NC 8 NC NC NC Demag FB Ct OVP NC 1 2 3 4 5 6 7 8 SO-16 16 NC 15 NC 14 VCC 13 Drive 12 Isense 11 GND 10 NC 9 NC
PIN FUNCTION DESCRIPTION
Pin No. DIP8 1 2 3 4 5 NA 6 7 8 DIP14 1 3 4 5 10 6 11 12 13 SO16 1 4 5 6 11 7 12 13 14 Pin Name HV Demag FB Ct Gnd OVP Isense Drv VCC Function Start-up rail Zero primary-current detection Feedback signal to control the PWM Timing capacitor The IC's ground Overvoltage input The primary-current sensing pin This pin drives the external switcher Powers the IC Description Connected to the rectified HV rail, this pin provides a charging path to VCC bulk capacitor. This pin ensures the re-start of the main switcher when operating in free-run. This level modulates the peak current level in free-running operation and modulates the frequency in VFM operation. By adding a capacitor from Ct to the ground, the user selects the minimum/maximum operating frequency. - By applying a 2.8 V typical level on this pin, the IC is permanently latched-off until VCC falls below UVLOL. This pin senses the primary current via an external shunt resistor. The IC is able to deliver or absorb 250 mA peak currents while delivering a clamped driving signal. A positive voltage up to 30 V maximum can be applied upon this pin before the IC stops.
1. DIP14 has different pinouts. Please see Pin Connections. 2. Pin 2, 7, 8, 9 and 14 are nonconnected on DIP14. 3. Pin 2, 3, 8, 9, 10, 15 and 16 are nonconnected on SO-16.
http://onsemi.com
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NCP1205
R2 150 + C1 10 µF 4x1N4007 + C14 22 µF D2 1N4148 D6 1N5819 C10 470 µF 10 V + L2 10 µH 5V + C11 100 µF 10 V
R5 15 R8 22 k
* R10 15 k M2 MTD1N60E 1 8 R4 10
D7 5.1 V
Universal Input
7 NCP1205P 6 3 2 4 5
IC4
SFH6156-2 R6 4.7 k C12 1 nF R3 3.3 C13 1.5 nF Y1
R1 560
* Please refer to the application information section regarding this element.
Figure 1. Typical Application Example for DIP8 Version
+ C1 10 µF
R2 15
D2 1N4148 D6 1N5819 C10 470 µF 10 V + L2 10 µH 5V + C11 47 µF 10 V D7 4.3 V IC4
ROVPU
4x1N4007
* R10 15 k
+ C14 33 µF/35 V
R5 15 R8 22 k 1 2 Universal Input 3 4 5 6 7 R6 2.7 k
NCP1205P2 14 13 12 11 SFH6156-2 10 9 8 R1 560 M2 MTD1N60E R4 6.8
ROVPL
C12 1 nF
R3 3.3
* Please refer to the application information section regarding this element.
Figure 2. Typical Application Example for DIP14 Version http://onsemi.com
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