NCP1124: High Voltage Switching Regulator for Offline SMPS

Overview
Specifications
Datasheet: High Voltage Switcher for Offline Power Supplies
Rev. 2 (188kB)
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Product Overview
Product Description
The NCP1124 switcher offers everything needed to build reliable and compact AC-DC switching power supplies with minimal surrounding elements. Incorporating an avalanche rated 650 V MOSFET, converters built with the NCP1124 can be safely designed for international conditions without jeopardizing the overall reliability.

The NCP1124 implements peak current mode control with adjustable ramp compensation that ensures stability in Continuous Conduction Mode (CCM) operation. With an external resistor, the maximum peak current is adjustable, allowing the designer the ability to inject ramp compensation to stabilize CCM power supplies.

A short circuit fault condition is independently detected from the auxiliary winding voltage resulting in improved short circuit protection with true overload detection. The Source pin provides access to the MOSFET source, allowing for overpower compensation.

With a supply range up to 26 V, the switcher also provides a jittered 65 kHz or 100 kHz switching frequency operated in peak current mode control. When the power on the secondary side starts to decrease, the switcher automatically folds back its switching frequency down to a minimum level of 26 kHz. As the power further goes down, the part enters skip cycle while limiting the peak current.
Features   Benefits
     
  • 650 V Avalanche Rated MOSFET
 
  • Rugged MOSFET for robust design
  • Fixed−Frequency 65 or 100 kHz Current−Mode Control with Adjustable Internal Ramp Compensation
 
  • Ability to scale for efficiency or size
  • Frequency Foldback Down to 26 kHz and Skip−Cycle for Light Load Efficiency
 
  • Eliminate acoustic noise and improved efficiency at light loads
  • Adjustable Current Limit with External Resistor
 
  • Scale for various designs 5W~20W
  • 50 ms Timer-Based Auto-Recovery Short-Circuit Protection
 
  • Provides more robust protection without worrying about the coupling of the aux winding
  • Frequency Jittering in Normal and Frequency Foldback Modes
 
  • Improved efficiency at light load / Improved EMI over the entire load
  • Option for Auto-Recovery or Latched Short-Circuit Protection
 
  • Flexible protection options
  • Less than 100 mW Standby Power at High Line
 
  • EPS 2.0 Compliant
Applications   End Products
  • Power Supply
 
  • Power supply for DVD, STB, CD-Player
  • Aux supply for TV, USB, Appliance
Technical Documentation & Design Resources
Design Notes (1) Package Drawings (1)
Data Sheets (1) Evaluation Board Documents (4)
Evaluation/Development Tool Information
Product Status Compliance Short Description Action
NCP1124DIPGEVB Active
Pb-free
10W SMPS Evaluation Board
Availability and Samples
Product
Status
Compliance
Description
Package
MSL*
Container
Budgetary Price/Unit
Type
Case Outline
Type
Qty.
NCP1124AP100G Active
Pb-free
Halide free
High Voltage Switching Regulator for Offline SMPS, 9-Ohm, Latch PDIP-8 626B NA Tube 50 $0.4
NCP1124AP65G Active
Pb-free
Halide free
High Voltage Switching Regulator for Offline SMPS, 9-Ohm, Latch PDIP-8 626B NA Tube 50 $0.4
NCP1124BP100G Active
Pb-free
Halide free
High Voltage Switching Regulator for Offline SMPS, 9-Ohm, Auto-recovery PDIP-8 626B NA Tube 50 $0.4
NCP1124BP65G Active
Pb-free
Halide free
High Voltage Switching Regulator for Offline SMPS PDIP-8 626B NA Tube 50 $0.4
Moisture Sensitivity level (MSL) for surface mount devices (lead free measured at 260°C reflow, non lead free at 235°C reflow)
Market Leadtime (weeks) :
Avnet   (2014-10-21 00:00) : <100
ON Semiconductor   (2014-10-22 00:00) : 350
Market Leadtime (weeks) :
Avnet   (2014-10-21 00:00) : <100
ON Semiconductor   (2014-10-22 00:00) : 554
Market Leadtime (weeks) :
Market Leadtime (weeks) :
Avnet   (2014-10-21 00:00) : <100
ON Semiconductor   (2014-10-22 00:00) : 306
Datasheet: High Voltage Switcher for Offline Power Supplies
Rev. 2 (188kB)
»View Material Composition
»No Product Change Notifications exist
Product Overview

Product Compliance Status Description Control Mode fsw Typ (kHz) fJitter Typ (%) Stand-by Mode RDS(ON) Typ (Ω) V(BR)DSS Max (V) IPeak (mA) HV Start-up Min (V) DSS (mA) UVLO Short Circuit Protection Over Power Comp. Brown-out Latch Package Type
 Pb-free 
 Halide free 
 Active     High Voltage Switching Regulator for Offline SMPS, 9-Ohm, Latch   Current Mode   65   +/- 5% of Fsw   Yes   9   650     Yes     8.8   Yes   No   No   Yes   PDIP-8 
 Pb-free 
 Halide free 
 Active     High Voltage Switching Regulator for Offline SMPS, 9-Ohm, Latch   Current Mode   100   +/- 5% of Fsw   Yes   9   650     Yes     8.8   Yes   No   No   Yes   PDIP-8 
 Pb-free 
 Halide free 
 Active     High Voltage Switching Regulator for Offline SMPS, 9-Ohm, Auto-recovery   Current Mode   65   +/- 5% of Fsw   Yes   9   650     Yes     8.8   Yes   No   No   No   PDIP-8 
 Pb-free 
 Halide free 
 Active     High Voltage Switching Regulator for Offline SMPS   Current Mode   100   +/- 5% of Fsw   Yes   9   650     Yes     8.8   Yes   No   No   No   PDIP-8 
Datasheet: High Voltage Switcher for Offline Power Supplies
Rev. 2 (188kB)
»View Material Composition
»No Product Change Notifications exist
Product Overview
Case Outlines
626B   
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