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NCP1253: PWM Controller, Current Mode, for Offline Power Supplies

Datasheet: Controller, Current Mode PWM, for Offline Power Supplies
Rev. 1 (215kB)
Product Overview
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The NCP1253 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 it's 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. To avoid sub harmonic oscillations in CCM operation, adjustable slope compensation is available via the series inclusion of a simple resistor in the current sense signal. Besides the auto-recovery timer-based short-circuit protection, an Over Voltage Protection on the Vcc pin protects the whole circuitry in case of optocoupler destruction or adverse open loop operation.
Features   Benefits
     
  • Frequency Foldback down to 26 kHz and Skip-Cycle in Light Load
 
  • Improved efficiency across the load range
  • Internal Ramp Compensation
 
  • Reduces the number of external components
  • Frequency Jittering in Normal and Frequency Foldback modes
 
  • Low EMI signature
  • Over Voltage Protection (OVP) monitoring on the Vcc pin
 
  • Protects against output over voltage conditions without any added components
  • Timer-based Auto-Recovery or Latched Short-Circuit Protection
 
  • Protection against fault conditions
Applications   End Products
  • Offline Adapters
  • AC-DC converters
 
  • Set-top Boxes
  • Printers
  • Notebooks and Netbooks
Technical Documentation & Design Resources
Design & Development Tools (1) Package Drawings (1)
Data Sheets (1)  
Availability & Samples
Specifications
Product
Status
Compliance
Description
Package
MSL
Container
Budgetary Price/Unit
Type
Case Outline
Type
Temperature
Type
Qty.
NCP1253ASN100T1G Obsolete
Pb-free
Halide free
NCP1253 TSOP-6 318G-02 1 260 Tape and Reel 3000  
NCP1253ASN65T1G Obsolete
Pb-free
Halide free
NCP1253 TSOP-6 318G-02 1 260 Tape and Reel 3000  
NCP1253BSN100T1G Active
Pb-free
Halide free
NCP1253 TSOP-6 318G-02 1 260 Tape and Reel 3000 $0.2
NCP1253BSN65T1G Active
Pb-free
Halide free
NCP1253 TSOP-6 318G-02 1 260 Tape and Reel 3000 $0.2
Market Leadtime (weeks) : Contact Factory
Market Leadtime (weeks) : Contact Factory
Market Leadtime (weeks) : 4 to 8
Market Leadtime (weeks) : 4 to 8

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
NCP1253BSN100T1G  
 $0.2 
Pb
H
 Active   
Flyback
Current Mode
100
Yes
8.8
Yes
No
Yes
28
300 / 500
TSOP-6
NCP1253BSN65T1G  
 $0.2 
Pb
H
 Active   
Flyback
Current Mode
65
Yes
8.8
Yes
No
Yes
28
300 / 500
TSOP-6
Case Outlines
318G-02   
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