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NCP1247: PWM Controller, Fixed Frequency, Flyback Converters, USB-Pd Reference Design

Datasheet: Fixed Frequency Current Mode Controller for Flyback Converters
Rev. 2 (1930kB)
Product Overview
»View Reliability Data
»View Material Composition
» Product Change Notification
The NCP1247 is a new fixed-frequency current-mode PWM controller featuring 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. This device contains a special HV detector which detects the application unplug from the AC input line and triggers the X2 discharge current. The HV structure also includes brown-out detection circuitry.
The NCP1247 features a timer-based fault detection that ensures the detection of overload and an adjustable power compensation to help keep the maximum power independent of the input voltage.
Due to frequency foldback, the controller exhibits excellent efficiency in light load condition while still achieving very low standby power consumption. Internal frequency jittering, ramp compensation, and a versatile latch input make this controller an excellent candidate for robust power supply designs.
A dedicated off mode allows the SMPS to reach extremely low no load input power consumption when combined with secondary side controller NCP4353 or NCP4354. When used together, the SMPS is capable of achieving <10 mW no load input power consumption. The secondary side controller signals the NCP1247 to enter a sleep mode, minimizing the power consumption of the control circuitry. The NCP1247 is very similar in its functionality to the NCP1246. The NCP1247 is designed to get better performance out of systems with synchronous rectification.

NCP1247
- Adds C & D option for different Brown Out threshold
- Enhanced operation with Sync Rec in light load
- Increased HV timer
- Revised X2 discharge sequence

This product is IEC60950 compliant. Please see the test report and certification in the Conformance report section below.
Features   Benefits
     
  • Frequency foldback and skip mode
 
  • Optimized efficiency across the entire load range
  • Timer-based overload protection with latched (A version) or auto-recovery (B version) operation
 
  • Protection against overcurrent and short circuit
  • High-voltage startup with dynamic self supply
 
  • Simplifies the design of the auxiliary supply
  • Integrated brown-out detection
 
  • Protects against any drops in line voltage
  • Frequency Modulation
 
  • Softened EMI signature
  • Adjustable overpower protection
 
  • Automatically adjusts the current limit depending on the line input voltage (high line or low line)
  • Latch off input
 
  • Protection against faults
Applications   End Products
  • AC-DC Adapters
  • LCD TV power supplies
  • USB-Pd (USB Power Delivery)
  • Offline USB Pd
 
  • Notebook Computers
  • Offline USB Power Delivery SMPS
Evaluation/Development Tool Information
Product Status Compliance Short Description Action
NCP1247USBPDGEVB Active
Pb-free
Fixed Frequency Current Mode PWM Controller Evaluation Board
Availability & Samples
Specifications
Product
Status
Compliance
Description
Package
MSL
Container
Budgetary Price/Unit
Type
Case Outline
Type
Temperature
Type
Qty.
NCP1247AD065R2G Active
Pb-free
Halide free
NCP1247 SOIC-7 751U 1 260 Tape and Reel 2500 $0.4693
NCP1247AD100R2G Last Shipments
Pb-free
Halide free
NCP1247 SOIC-7 751U 1 260 Tape and Reel 2500  
NCP1247BD065R2G Active
Pb-free
Halide free
NCP1247 SOIC-7 751U 1 260 Tape and Reel 2500 $0.4693
NCP1247BD100R2G Last Shipments
Pb-free
Halide free
NCP1247 SOIC-7 751U 1 260 Tape and Reel 2500  
NCP1247CD065R2G Last Shipments
Pb-free
Halide free
NCP1247 SOIC-7 751U 1 260 Tape and Reel 2500  
NCP1247CD100R2G Obsolete
Pb-free
Halide free
NCP1247 SOIC-7 751U 1 260 Tape and Reel 2500  
NCP1247DD065R2G Active
Pb-free
Halide free
NCP1247 SOIC-7 751U 1 260 Tape and Reel 2500 $0.4693
NCP1247DD100R2G Last Shipments
Pb-free
Halide free
NCP1247 SOIC-7 751U 1 260 Tape and Reel 2500  
Market Leadtime (weeks) : 4 to 8
ON Semiconductor   (2020-09-02 00:00) : 3,172
Market Leadtime (weeks) : Contact Factory
Market Leadtime (weeks) : Contact Factory
Market Leadtime (weeks) : Contact Factory
ON Semiconductor   (2020-09-02 00:00) : 7,500
Market Leadtime (weeks) : Contact Factory
Market Leadtime (weeks) : Contact Factory
Market Leadtime (weeks) : 13 to 16
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
NCP1247AD065R2G  
 $0.4693 
Pb
H
 Active   
Flyback
Current Mode
65
Yes
8.9
Yes
Yes
Yes
28
500 / 800
SOIC-7
NCP1247BD065R2G  
 $0.4693 
Pb
H
 Active   
Flyback
Current Mode
65
Yes
8.9
Yes
Yes
Yes
28
500 / 800
SOIC-7
NCP1247DD065R2G  
 $0.4693 
Pb
H
 Active   
Flyback
Current Mode
65
Yes
8.9
Yes
Yes
Yes
28
500 / 800
SOIC-7
Case Outlines
751U   
Previously Viewed Products
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Featured Video
Fixed Frequency Current Mode PWM Controller Evaluation Board - NCP1247USBPDGEVB
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