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NCP1205 Dataheets PDF



Part Number NCP1205
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Description Single Ended PWM Controller
Datasheet NCP1205 DatasheetNCP1205 Datasheet (PDF)

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 outpu.

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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 startup sequence without deteriorating the efficiency once off. The continuous feedback signal monitoring implemented with an Overcurrent fault Protection circuitry (OCP) makes the final design rugged and reliable. The PDIP--14 offers an adjustable version of the OVP threshold via an external resistive network. Features  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 Startup Source  Current Mode Control  Adjustable Overvoltage Level  These are Pb--Free Devices Applications  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.) http://onsemi.com MARKING DIAGRAM 8 1 PDIP--8 N SUFFIX CASE 626 8 1205P AWL YYWWG 1 14 1 PDIP--14 P SUFFIX CASE 646 14 NCP1205P2 AWLYYWWG 1 16 1 16 SOIC--16 D SUFFIX CASE 751B NCP1205DG AWLYWW 1 A WL YY, Y WW G = Assembly Location = Wafer Lot = Year = Work Week = Pb--Free Package ORDERING INFORMATION Device Package Shipping† NCP1205PG PDIP--8 (Pb--Free) 50 Units/Rail NCP1205P2G PDIP--14 (Pb--Free) 25 Units/Rail NCP1205DR2G SOIC--16 2500/Tape & Reel (Pb--Free) †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D.  Semiconductor Components Industries, LLC, 2010 December, 2010 -- Rev. 10 1 Publication Order Number: NCP1205/D HV 1 Demag 2 FB 3 Ct 4 8 VCC 7 Drive 6 Isense 5 GND PDIP--8 NCP1205 PIN CONNECTIONS HV 1 14 NC NC 2 Demag 3 13 VCC 12 Drive FB 4 Ct 5 OVP 6 NC 7 11 Isense 10 GND 9 NC 8 NC PDIP--14 HV 1 NC 2 NC 3 Demag 4 FB 5 Ct 6 OVP 7 NC 8 16 NC 15 NC 14 VCC 13 Drive 12 Isense 11 GND 10 NC 9 NC SOIC--16 PIN FUNCTION DESCRIPTION Pin No. PDIP--8 PDIP--14 SOIC--16 Pin Name 1 1 1 HV Function Startup rail 23 34 45 4 Demag Zero primary--current detection 5 FB Feedback signal to control the PWM 6 Ct Timing capacitor 5 10 11 GND The IC’s ground NA 6 7 OVP Overvoltage input 6 11 12 Isense The primary--current sensing pin 7 12 13 Drv This pin drives the external switcher 8 13 14 VCC Powers the IC 1. PDIP--14 has different pinouts. Please see Pin Connections. 2. Pin 2, 7, 8, 9 and 14 are nonconnected on PDIP--14. 3. Pin 2, 3, 8, 9, 10, 15 and 16 are nonconnected on SOIC--16. Description Connected to the rectified HV rail, this pin provides a charging path to VCC bulk capacitor. This pin ensures the restart 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. http://onsemi.com 2 NCP1205 4x1N4007 R5 15 Universal Input +C1 10 mF * R10 R8 15 k 22 k 18 27 3 NCP1205P 6 45 R6 C12 4.7 k 1 nF R2 D2 150 1N4148 + C14 22 mF M2 MTD1N60E R4 10 D6 1N5819 L2 10 mH C10 470 mF 10 V + + 5V C11 100 mF 10 V D7 5.1 V IC4 SFH6156--2 R3 3.3 C13 R1 560 * Please refer to the application information section regarding this element. 1.5 nF Y1 Figure 1. Typical Application Example for PDIP--8 Version 4x1N4.


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