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NCP1250: PWM Controller, Current Mode, for Offline Power Supplies

Datasheet: PWM Controller, Current Mode, for Offline Power Supplies
Rev. 10 (284kB)
Product Overview
»View Reliability Data
»View Material Composition
» Product Change Notification
The NCP1250 is a highly integrated PWM controller capable of delivering a rugged and high performance offline power supply in a tiny TSOP-6 package. With a supply range up to 28 V, the controller hosts a jittered 65 kHz or 100 kHz switching circuitry operated in peak current mode control. When the power on the secondary side starts to decrease, the controller 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. 40W Adapter
Over Power Protection (OPP) is a difficult exercise especially when no-load standby requirements drive the converter specifications. The ON proprietary integrated OPP lets you harness the maximum delivered power without affecting your standby performance simply via two external resistors. An Over Voltage Protection input is also combined on the same pin and protects the whole circuitry in case of optocoupler failure or adverse open loop operation.
Finally, a timer-based short-circuit protection offers the best protection scheme, letting you precisely select the protection trip point irrespective of a loose coupling between the auxiliary and the power windings.
Features   Benefits
     
  • Non-dissipative internal and adjustable Over Power Protection (OPP) circuits
 
  • Limits maximum delivered power without affecting standby performance
  • Frequency Foldback down to 26 kHz and Skip-Cycle in light load conditions
 
  • High efficiency in light load conditions
  • Internal Ramp Compensation
 
  • Reduces the number of external components
  • Frequency jittering from full load to skip-cycle
 
  • Improved EMI performance
  • Latch input for OVP and OTP implementations
 
  • Simple implementation of required protection functions
  • See NCP1251 for integrated Over Voltage Protection (OVP) monitoring on the Vcc pin
   
Applications   End Products
  • Offline Adapters
  • AC-DC converters
 
  • Set-top Boxes
  • Printers
  • Notebooks and Netbooks
Evaluation/Development Tool Information
Product Status Compliance Short Description Action
NCP1250B40WGEVB Active
Pb-free
40 W Notebook Adapter Demonstration Evaluation Board
Availability & Samples
Specifications
Case Outlines
Application Diagram
Product
Status
Compliance
Description
Package
MSL
Container
Budgetary Price/Unit
Type
Case Outline
Type
Temperature
Type
Qty.
NCP1250ASN100T1G Obsolete
Pb-free
Halide free
NCP1250 TSOP-6 318G-02 1 260 Tape and Reel 3000  
NCP1250ASN65T1G Active
Pb-free
Halide free
NCP1250 TSOP-6 318G-02 1 260 Tape and Reel 3000 $0.1872
NCP1250BP65G Active
Pb-free
Halide free
NCP1250 PDIP-8 626-05 NA Tube 50 $0.4
NCP1250BSN100T1G Last Shipments
Pb-free
Halide free
NCP1250 TSOP-6 318G-02 1 260 Tape and Reel 3000  
NCP1250BSN65T1G Active
Pb-free
Halide free
NCP1250 TSOP-6 318G-02 1 260 Tape and Reel 3000 $0.1872
Market Leadtime (weeks) : Contact Factory
Market Leadtime (weeks) : Contact Factory
Market Leadtime (weeks) : 8 to 12
Market Leadtime (weeks) : Contact Factory
Market Leadtime (weeks) : 13 to 16
PandS   (2020-09-14 00:00) : >1K

Product
Description
Pricing ($/Unit)
Compliance
Status
Topology
Control Mode
fsw Typ (kHz)
Stand-by Mode
UVLO (V)
Short Circuit Protection
Latch
Soft Start
VCC Max (V)
Drive Cap. (mA)
Package Type
NCP1250ASN65T1G  
 $0.1872 
Pb
H
 Active   
Flyback
Current Mode
65
Yes
8.8
Yes
Yes
Yes
28
300 / 500
TSOP-6
NCP1250BP65G  
 $0.4 
Pb
H
 Active   
Flyback
Current Mode
65
Yes
8.8
Yes
Yes
Yes
28
300 / 500
PDIP-8
NCP1250BSN65T1G  
 $0.1872 
Pb
H
 Active   
Flyback
Current Mode
65
Yes
8.8
Yes
Yes
Yes
28
300 / 500
TSOP-6
Case Outlines
626-05    318G-02   
Packages
NCP1250: PWM Controller, Current Mode, for Offline Power Supplies
NCP1250: PWM Controller, Current Mode, for Offline Power Supplies
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Featured Video
40 W Notebook Adapter Demonstration Evaluation Board - NCP1250B40WGEVB Test Procedure
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