NCP1294EG AWLYWW DATA SHEET www.onsemi.com Flyback, Boost, Forward SOIC16 PWM Controller D SUFFIX 16 CASE 751B 1 NCP1294 TSSOP16 DB SUFFIX The NCP1294 fixed frequency feed forward voltage mode PWM 16 CASE 948F controller contains all of the features necessary to be configured in a Flyback, Boost or Forward topology. This PWM controller has been 1 optimized for high frequency primary side control operation. In addition, this device includes such features as: SoftStart, accurate duty cycle limit control, less than 50 A startup current, over and PIN CONNECTIONS AND undervoltage protection, and bidirectional synchronization. The MARKING DIAGRAM NCP1294 is available in a 16 lead SOIC narrow surface mount package. 1 16 GATE V C Features I PGND SENSE SYNC V CC 1.0 MHz Frequency Capability FF V REF Fixed Frequency Voltage Mode Operation, with Feed Forward UV LGND OV SS Thermal Shutdown R C COMP T T Undervoltage LockOut I V SET FB Accurate Programmable Max Duty Cycle Limit 1.0 A Sink/Source Gate Drive 16 Programmable PulseByPulse Overcurrent Protection NCP 1294 Leading Edge Current Sense Blanking ALYW 75 ns Shutdown Propagation Delay 1 Programmable SoftStart Undervoltage Protection NCP1294= Specific Device Code Overvoltage Protection with Programmable Hysteresis A = Assembly Location Bidirectional Synchronization WL, L = Wafer Lot YY, Y = Year 25 ns GATE Rise and Fall Time (1.0 nF Load) WW, W = Work Week 3.3 V 3% Reference Voltage Output G or = PbFree Package These Devices are PbFree, Halogen Free/BFR Free and are RoHS Compliant ORDERING INFORMATION Device Package Shipping NCP1294EDR2G SOIC16 2500 Tape & Reel (PbFree) NCP1294EDBR2G TSSOP16 2500 Tape & Reel (PbFree) For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. *For additional information on our PbFree strategy and soldering details, please download the onsemi Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. Semiconductor Components Industries, LLC, 2009 1 Publication Order Number: August, 2021 Rev. 1 NCP1294/DNCP1294 Figure 1. Application Diagram, 36 V72 V to 5.0 V/5.0 A Converter www.onsemi.com 2 100 BAS21 V (36 V to 72 V) IN 51 k 1.0 F FZT688 22 F 18 V 11 V 160 k T3 T2 100:1 2:5 V OUT T1 0.1 F 10 MBRB2545CT (5.0 V/5.0 A) 10 k 4:1 24.3 k 510 k 0.22 F 10 V V C CC 100 F D11 V UV REF 4.3 k 680 pF SGND BAS21 10 k 200 COMP OV D13 2200 pF V I 100 pF V33MLA1206A23 FB SET 13 k 1.0 F 20.25 k R C FF T T 10 SYNC GATE IRF634 SS I SENSE LGND PGND 62 10 330 pF 470 pF 0.01 F 0.1 F 5.1 k 2.0 k 5.6 k 180 1.0 k TL431 2.0 k 4700 pF 150 MOC81025 1.0 k NCP1294