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NCP1377: Controller, Free Running Quasi-Resonant Current Mode

Datasheet: PWM Current-Mode Controller for Free-Running Quasi-Resonant Operation
Rev. 13 (190kB)
Product Overview
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» Product Change Notification
The NCP1377 combines a true current mode modulator and a demagnetization detector which ensures full borderline / critical Conduction Mode in any load/line conditions together with minimum drain voltage switching (Quasi-Resonant operation). Due to its inherent skip cycle capability, the controller enters burst mode as soon as the power demand falls below a predetermined level. As this happens at low peak current, no audible noise can be heard. For NCP1377, an internal 8.0µs timer prevents the free-run frequency to exceed the 150kHz CISPR-22 EMI starting limit while the skip adjustment capability lets the user select the frequency at which the burst foldback takes place. For NCP1377B, the internal timer duration is reduced to 3.0µs to allow operation at higher frequencies.
The transformer core reset detection is done through an auxiliary winding which, brought via a dedicated pin, also enables fast Over-Voltage Protection (OVP). Once an OVP has been detected, the IC permanently latches-off. The 1377 features a sampling time of 4.5µs whereas it is 1.5µs for the B version.
The NCP1377 also features an efficient protective circuitries which, in presence of an overcurrent condition, disables the output pulses and enters a safe burst mode, trying to re-start. Once the default has gone, the device auto-recovers. Finally an internal 1ms soft-start eliminates the traditional startup stress.
Features
 
  • Free-running borderline / critical mode quasi-resonant operation
  • Latched Over Voltage Protection
  • Auto-recovery short-circuit protection via UVLO crossover
  • External latch triggering, e.g. via over-temperature signal
  • Current-Mode with adjustable Skip-cycle capability
  • Internal 1ms soft-start
  • Internal temperature shutdown
  • Internal Leading Edge Blanking
  • 500mA peak current source/sink capability
  • Under Voltage Lockout level of 12.5V (on) and 7.5V (min)
  • Direct optocoupler connection
  • SPICE models available for TRANsient analysis
  • Internal minimum TOFF
  • Auxiliary power supplies (USB, appliances, TVs etc.)
  • Pb-Free Packages are Available
Applications
  • AC/DC adapters for notebooks etc.
  • Offline battery chargers
  • Consumer electronics (DVD players, set-top boxes, TVs, etc.)
  • Auxiliary power supplies (USB, appliances, TVs etc.)
Product
Status
Compliance
Description
Package
MSL
Container
Budgetary Price/Unit
Type
Case Outline
Type
Temperature
Type
Qty.
NCP1377BD1R2G Active, Not Rec 
Pb-free
Halide free
NCP1377 SOIC-7 751U 1 260 Tape and Reel 2500 $0.4267
NCP1377BDR2G Active, Not Rec 
Pb-free
Halide free
NCP1377 SOIC-8 751-07 1 260 Tape and Reel 2500 $0.4267
NCP1377BPG Active, Not Rec 
Pb-free
Halide free
NCP1377 PDIP-8 626B NA Tube 50 $0.5404
NCP1377D1R2G Active, Not Rec 
Pb-free
Halide free
NCP1377 SOIC-7 751U 1 260 Tape and Reel 2500 $0.4267
NCP1377DR2G Active, Not Rec 
Pb-free
Halide free
NCP1377 SOIC-8 751-07 1 260 Tape and Reel 2500 $0.4267
NCP1377PG Active, Not Rec 
Pb-free
Halide free
NCP1377 PDIP-8 626B NA Tube 50 $0.4667
Market Leadtime (weeks) : 2 to 4
ON Semiconductor   (2020-09-02 00:00) : 10,000
PandS   (2020-09-14 00:00) : >1K
Market Leadtime (weeks) : 8 to 12
PandS   (2020-09-14 00:00) : >1K
FutureElectronics   (2020-08-19 00:00) : >1K
Market Leadtime (weeks) : 2 to 4
ON Semiconductor   (2020-09-02 00:00) : 8,750
PandS   (2020-09-14 00:00) : <1K
Market Leadtime (weeks) : 8 to 12
PandS   (2020-09-14 00:00) : >1K
Market Leadtime (weeks) : 8 to 12
PandS   (2020-09-14 00:00) : <100
Market Leadtime (weeks) : 13 to 16
PandS   (2020-09-14 00:00) : >1K
Case Outlines
751-07    626B    751U   
Packages
NCP1377: Controller, Free Running Quasi-Resonant Current Mode
NCP1377: Controller, Free Running Quasi-Resonant Current Mode
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