Programmable, Off-Line, PWM Controller

The UC1851 family of PWM Controllers are optimized for off-line primary side control. These devices include a high current totem pole output stage and a toggle Flip-Flop for absolute 50% duty cycle limiting. In all other respects this line of controllers is pin for pin compatible with the UC1841 series. Inclusion of all major housekeeping functions in these high performance controllers makes them ideal for use in cost sensitive applications.
Important features of these controllers include low current start-up, linear feed-forward for constant volt-second operation, and compatibility with both voltage or current mode control. In addition, these devices include a programmable start threshold, as well as programmable over-voltage, under-voltage, and over current fault thresholds. The fault latch on these devices CAN be configured for Automatic restart, or latched off response to a fault.
These devices are packaged in 18-pin plastic or ceramic dual-in-line packages, or for surface mount applications, a 20 Pin PLCC. The UC1851 is characterized for -55C to +125C operation while the UC2851 and UC3851 are designed for -40C to +85C and 0C to +70C, respectively.
By Texas Instruments
Part Manufacturer Description Datasheet Samples
UC2851N Texas Instruments Programmable, Off-Line, PWM Controller 18-PDIP -40 to 85
UC2851NG4 Texas Instruments Programmable, Off-Line, PWM Controller 18-PDIP -40 to 85
UC2851DWG4 Texas Instruments Programmable, Off-Line, PWM Controller 18-SOIC -40 to 85
UC2851DW Texas Instruments Programmable, Off-Line, PWM Controller 18-SOIC -40 to 85
UC2851 's PackagesUC2851 's pdf datasheet
UC2851DW
UC2851DWG4
UC2851DWTRG4
UC2851N
UC2851NG4




UC2851 Pinout, Pinouts
UC2851 pinout,Pin out
This is one package pinout of UC2851,If you need more pinouts please download UC2851's pdf datasheet.

UC2851 Application circuits
UC2851 circuits
This is one application circuit of UC2851,If you need more circuits,please download UC2851's pdf datasheet.


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