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NCP1239: Fixed Frequency Current Mode Controller for Flyback Converter with HV startup

Datasheet: Fixed Frequency Current-Mode Controller for Flyback Converter
Rev. 25 (296kB)
Product Overview
»View Reliability Data
»View Material Composition
» Product Change Notification
The NCP1239 is a fixed-frequency current-mode controller featuring the Dynamic Self-Supply. This function greatly simplifies the design of the auxiliary supply and the Vcc capacitor by activating the internal startup current source to supply the controller during start-up, transients, latch, stand-by etc. With a supply range up to 35 V, the controller hosts a jittered 65 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 minimum level of 26 kHz. As the power further goes down, the part enters skip cycle while limiting the peak current that insures excellent efficiency in light load condition. It features a timer-based fault detection that ensures the detection of overload and an adjustable compensation to help keep the maximum power independent of the input voltage.
Features   Benefits
     
  • Fixed-frequency 65-kHz or 100-kHz current-mode control operation
 
  • Fixed-frequency is simple to implement and predictable in term of EMI
  • Frequency foldback down to 26 kHz and skip mode
 
  • Maximize performance in light load conditions
  • Adjustable Over Power Protection (OPP) circuit
 
  • OPP can be adjusted to the need of specific applications
  • High-voltage Current Source with Brown-out (BO) detection
 
  • BO monitor and detect a falling input voltage, needed in some applications
  • Internal fixed 8-ms soft-start
 
  • Simplified implementation that does not require programming
  • Frequency jittering in normal and frequency foldback modes
 
  • Lowers switching frequency EMI
  • 64-ms timer-based short-circuit protection with auto-recovery or latched operation
 
  • Allows for safe operation while tolerant to faults if needed
  • Pre-short ready
 
  • Safe operation yet tolerant to faults
  • Latched OVP on Vcc (NCP1239 A & B versions)
 
  • Safe operation
  • Latched OVP/OTP input for improved robustness
 
  • Safe operation
  • +500 mA/ -500 mA peak source/sink drive capability
 
  • Can drive larger FETs
  • Internal thermal shutdown
 
  • Safe operation
  • Extremely low no-load standby power
 
  • Ideal for environmentally friendly applications
  • Pin-to-pin compatible with the existing NCP1236/1247 series
 
  • Enable cost saving compared to other device
  • Internal ramp compensation
   
  • 35-V Vcc operation
   
Applications   End Products
  • Auxiliary Power
  • Industrial Power
 
  • AC/DC Power Adapters
  • Set-top Box
Evaluation/Development Tool Information
Product Status Compliance Short Description Action
NCP1239B65WGEVB Active
Pb-free
65W, 19V, Power Supply Evaluation Board
Availability & Samples
Specifications
Product
Status
Compliance
Description
Package
MSL
Container
Budgetary Price/Unit
Type
Case Outline
Type
Temperature
Type
Qty.
NCP1239AD100R2G Active
Pb-free
Halide free
NCP1239 SOIC-7 751U 1 260 Tape and Reel 2500 $0.3227
NCP1239AD65R2G Active
Pb-free
Halide free
NCP1239 SOIC-7 751U 1 260 Tape and Reel 2500 $0.3227
NCP1239BD100R2G Active
Pb-free
Halide free
NCP1239 SOIC-7 751U 1 260 Tape and Reel 2500 $0.3227
NCP1239BD65R2G Active
Pb-free
Halide free
NCP1239 SOIC-7 751U 1 260 Tape and Reel 2500 $0.3227
NCP1239CD65R2G Active
Pb-free
Halide free
NCP1239 SOIC-7 751U 1 260 Tape and Reel 2500 $0.3227
NCP1239DD100R2G Active
Pb-free
Halide free
NCP1239 SOIC-7 751U 1 260 Tape and Reel 2500 $0.3227
NCP1239DD65R2G Active
Pb-free
Halide free
NCP1239 SOIC-7 751U 1 260 Tape and Reel 2500 $0.3227
NCP1239ED100R2G Active
Pb-free
Halide free
NCP1239 SOIC-7 751U 1 260 Tape and Reel 2500 $0.3227
NCP1239ED65R2G Active
Pb-free
Halide free
NCP1239 SOIC-7 751U 1 260 Tape and Reel 2500 $0.2933
NCP1239FD65R2G Active
Pb-free
Halide free
NCP1239 SOIC-7 751U 1 260 Tape and Reel 2500 $0.2933
NCP1239GD100R2G Active
Pb-free
Halide free
NCP1239 SOIC-7 751U 1 260 Tape and Reel 2500 $0.2933
NCP1239HD65R2G Active
Pb-free
Halide free
NCP1239 SOIC-7 751U 1 260 Tape and Reel 2500 $0.2933
NCP1239ID65R2G Active
Pb-free
Halide free
NCP1239 SOIC-7 751U 1 260 Tape and Reel 2500 $0.2933
NCP1239KD65R2G Active
Pb-free
Halide free
NCP1239 SOIC-7 751U 1 260 Tape and Reel 2500 $0.2933
NCP1239LD65R2G Active
Pb-free
Halide free
NCP1239 SOIC-7 751U 1 260 Tape and Reel 2500 $0.2933
NCP1239MD65R2G Active, Not Rec
Pb-free
Halide free
NCP1239 SOIC-7 751U 1 260 Tape and Reel 2500 $0.2933
NCP1239ND65R2G Active, Not Rec
Pb-free
Halide free
NCP1239 SOIC-7 751U 1 260 Tape and Reel 2500 $0.3227
NCP1239PD65R2G Active
Pb-free
Halide free
NCP1239 SOIC-7 751U 1 260 Tape and Reel 2500 $0.2933
NCP1239QD65R2G Active
Pb-free
Halide free
NCP1239 SOIC-7 751U 1 260 Tape and Reel 2500 $0.2933
NCP1239RD65R2G Active
Pb-free
Halide free
NCP1239 SOIC-7 751U 1 260 Tape and Reel 2500 $0.2933
Market Leadtime (weeks) : 4 to 8
ON Semiconductor   (2020-09-02 00:00) : 15,000
Market Leadtime (weeks) : 8 to 12
Market Leadtime (weeks) : Contact Factory
Market Leadtime (weeks) : Contact Factory
Market Leadtime (weeks) : 8 to 12
Market Leadtime (weeks) : 8 to 12
ON Semiconductor   (2020-09-02 00:00) : 10,000
Market Leadtime (weeks) : Contact Factory
Market Leadtime (weeks) : Contact Factory
Market Leadtime (weeks) : Contact Factory
Market Leadtime (weeks) : Contact Factory
Market Leadtime (weeks) : 4 to 8
ON Semiconductor   (2020-09-02 00:00) : 12,500
Market Leadtime (weeks) : 4 to 8
Market Leadtime (weeks) : Contact Factory
Market Leadtime (weeks) : 8 to 12
Market Leadtime (weeks) : 4 to 8
Market Leadtime (weeks) : Contact Factory
Market Leadtime (weeks) : Contact Factory
Market Leadtime (weeks) : 8 to 12
Market Leadtime (weeks) : 4 to 8
ON Semiconductor   (2020-09-02 00:00) : 12,500
Market Leadtime (weeks) : 8 to 12
ON Semiconductor   (2020-09-02 00:00) : 17,500

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
NCP1239AD100R2G  
 $0.3227 
Pb
H
 Active   
Flyback
Current Mode
100
Yes
8
Yes
Yes
Yes
35
500 / 500
SOIC-7
NCP1239AD65R2G  
 $0.3227 
Pb
H
 Active   
Flyback
Current Mode
65
Yes
8
Yes
Yes
Yes
35
500 / 500
SOIC-7
NCP1239BD100R2G  
 $0.3227 
Pb
H
 Active   
Flyback
Current Mode
100
Yes
8
Yes
Yes
Yes
35
500 / 500
SOIC-7
NCP1239BD65R2G  
 $0.3227 
Pb
H
 Active   
Flyback
Current Mode
65
Yes
8
Yes
Yes
Yes
35
500 / 500
SOIC-7
NCP1239CD65R2G  
 $0.3227 
Pb
H
 Active   
Flyback
Current Mode
65
Yes
8
Yes
Yes
Yes
35
500 / 500
SOIC-7
NCP1239DD100R2G  
 $0.3227 
Pb
H
 Active   
Flyback
Current Mode
100
Yes
8
Yes
Yes
Yes
35
500 / 500
SOIC-7
NCP1239DD65R2G  
 $0.3227 
Pb
H
 Active   
Flyback
Current Mode
65
Yes
8
Yes
Yes
Yes
35
500 / 500
SOIC-7
NCP1239ED100R2G  
 $0.3227 
Pb
H
 Active   
Flyback
Current Mode
100
Yes
8
Yes
No
Yes
35
500 / 500
SOIC-7
NCP1239ED65R2G  
 $0.2933 
Pb
H
 Active   
Flyback
Current Mode
65
Yes
8
Yes
No
Yes
35
500 / 500
SOIC-7
NCP1239FD65R2G  
 $0.2933 
Pb
H
 Active   
Flyback
Current Mode
65
Yes
8
Yes
Yes
Yes
35
500 / 500
SOIC-7
NCP1239GD100R2G  
 $0.2933 
Pb
H
 Active   
Flyback
Current Mode
100
Yes
8
Yes
Yes
Yes
35
500 / 500
SOIC-7
NCP1239HD65R2G  
 $0.2933 
Pb
H
 Active   
Flyback
Current Mode
65
Yes
8
Yes
Yes
Yes
35
500 / 500
SOIC-7
NCP1239ID65R2G  
 $0.2933 
Pb
H
 Active   
Flyback
Current Mode
65
Yes
8
Yes
No
Yes
35
500 / 500
SOIC-7
NCP1239KD65R2G  
 $0.2933 
Pb
H
 Active   
Flyback
Current Mode
65
Yes
8
Yes
Yes
Yes
35
500 / 500
SOIC-7
NCP1239LD65R2G  
 $0.2933 
Pb
H
 Active   
Flyback
Current Mode
65
Yes
8
Yes
Yes
Yes
35
500 / 500
SOIC-7
NCP1239PD65R2G  
 $0.2933 
Pb
H
 Active   
Flyback
Current Mode
65
Yes
8
Yes
No
Yes
35
500 / 500
SOIC-7
NCP1239QD65R2G  
 $0.2933 
Pb
H
 Active   
Flyback
Current Mode
65
Yes
8
Yes
No
Yes
35
500 / 500
SOIC-7
NCP1239RD65R2G  
 $0.2933 
Pb
H
 Active   
Flyback
Current Mode
65
Yes
8
Yes
Yes
Yes
35
500 / 500
SOIC-7
Case Outlines
751U   
Previously Viewed Products
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Featured Video
65W, 19V, Power Supply Evaluation Board - NCP1239B65WGEVB
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