NCP1351: Controller, Variable Off-Time Current Mode, with Short Circuit Protection

Datasheet: Variable Off Time PWM Controller
Rev. 3 (526.0kB)
Product Overview
View Reliability Data
View Material Composition
Product Change Notification
The NCP1351 is a current mode controller targeting low power off line flyback Switched Mode Power Supplies (SMPS) where cost is of utmost importance. Based on a fixed peak current technique (quasi fixed TON), the controller decreases its switching frequency as the load becomes lighter. As a result, a power supply using the NCP1351 naturally offers excellent no load power consumption, while optimizing the efficiency in other loading conditions. When the frequency decreases, the peak current is gradually reduced down to approximately 30% of the maximum peak current to prevent transformer mechanical resonance. The risk of acoustic noise is thus greatly diminished while keeping good standby power performance.
An externally adjustable timer permanently monitors the feedback activity and protects the supply in presence of a short circuit or an overload. Once the timer elapses, NCP1351 stops switching and stays latched for version A, and tries to restart for Version B.
The internal structure features an optimized arrangement which allows one of the lowest available startup current, a fundamental parameter when designing low standby power supplies. The negative current sensing technique minimizes the impact of the switching noise on the controller operation and offers the user to select the maximum peak voltage across his current sense resistor. Its power dissipation can thus be application optimized.
Finally, the bulk input ripple ensures a natural frequency smearing which smooths the EMI signature.
Features   Benefits
     
  • Quasi fixed TON, Variable TOFF Current Mode Control
 
  • Natural frequency foldback
  • Frequency foldback with Peak Current Compression
 
  • Noise free & improved efficiency in light load
  • Short circuit protection (latched A version or auto restart B version)
 
  • Independent of the auxiliary Winding
  • Primary or secondary side regulation
   
  • Dedicated Latch Input for OTP, OVP
   
  • Low start-up current
   
  • Natural frequency jittering
   
  • Negative current sensing with programmable current sense resistor
   
Applications   End Products
  • Auxiliary Power Supply
  • Off-line battery chargers
 
  • Printers
  • Adapters
Availability & Samples
Specifications
Case Outlines
Interactive Block Diagram
Product
Status
Compliance
Description
Package
MSL
Container
Budgetary Price/Unit
Type
Case Outline
Type
Temperature
Type
Qty.
NCP1351ADR2G Obsolete
Pb-free
Halide free
NCP1351 SOIC-8 751-07 1 260 Tape and Reel 2500  
NCP1351APG Obsolete 
Pb-free
Halide free
NCP1351 PDIP-8 626-05 NA Tube 50  
NCP1351BDR2G Active
Pb-free
Halide free
NCP1351 SOIC-8 751-07 1 260 Tape and Reel 2500 $0.32
NCP1351BPG Obsolete 
Pb-free
Halide free
NCP1351 PDIP-8 626-05 NA Tube 50  
NCP1351CDR2G Obsolete
Pb-free
Halide free
NCP1351 SOIC-8 751-07 1 260 Tape and Reel 2500  
NCP1351CPG Obsolete 
Pb-free
Halide free
NCP1351 PDIP-8 626-05 NA Tube 50  
NCP1351DDR2G Obsolete
Pb-free
Halide free
NCP1351 SOIC-8 751-07 1 260 Tape and Reel 2500  
NCP1351DPG Obsolete 
Pb-free
Halide free
NCP1351 PDIP-8 626-05 NA Tube 50  
Market Leadtime (weeks) : Contact Factory
PandS   (2020-09-14 00:00) : <1K
Market Leadtime (weeks) : Contact Factory
PandS   (2020-09-14 00:00) : <100
Market Leadtime (weeks) : Contact Factory
PandS   (2020-09-14 00:00) : <1K
Market Leadtime (weeks) : Contact Factory
PandS   (2020-09-14 00:00) : <100
Market Leadtime (weeks) : Contact Factory
PandS   (2020-09-14 00:00) : >1K
Market Leadtime (weeks) : Contact Factory
PandS   (2020-09-14 00:00) : <1K
Market Leadtime (weeks) : Contact Factory
PandS   (2020-09-14 00:00) : <1K
Market Leadtime (weeks) : Contact Factory

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
NCP1351BDR2G  
 $0.32 
Pb
H
 Active   
Flyback
Current Mode
Variable
No
Yes
Yes
Yes
No
28
400 / 400
SOIC-8
Case Outlines
751-07    626-05   
Packages
NCP1351: Controller, Variable Off-Time Current Mode, with Short Circuit Protection
Previously Viewed Products
Clear List

Featured Video
20 W Constant Current LED Driver Evaluation Board - NCP1351LEDGEVB
Your request has been submitted for approval.
Please allow 2-5 business days for a response.
You will receive an email when your request is approved.
Request for this document already exists and is waiting for approval.