Current-Mode PWM Controller

The UC1842 3/4/5 family of control devices provides the necessary features to implement off-line or dc-to-dc fixed frequency current mode control schemes with a minimal external parts count. Internally implemented circuits include under-voltage lockout featuring start up current less than 1 mA, a precision reference trimmed for accuracy at the error amp input, Logic to insure latched operation, a PWM Comparator which also provides current limit control, and a totem pole output stage designed to source or sink high peak current. The output stage, suitable for driving N-Channel MOSFETs is low in the off state.
Differences between members of this family are the under-voltage lockout thresholds and maximum duty cycle ranges. The UC1842 and UC1844 have UVLO thresholds of 16 VON and 10 VOFF, ideally suited to off-line applications. The corresponding thresholds for the UC1843 and UC1845 are 8.4 V and 7.6 V. The UC1842 and UC1843 CAN operate to duty cycles approaching 100%. A range of zero to 50% is obtained by the UC1844 and UC1845 by the addition of an internal toggle flip flop which blanks the output off every other Clock cycle.
By Texas Instruments
Part Manufacturer Description Datasheet Samples
UC2844D8TRG4 Texas Instruments Current-Mode PWM Controller 8-SOIC -40 to 85
UC2844NG4 Texas Instruments Current-Mode PWM Controller 8-PDIP -40 to 85
UC2844D8TR Texas Instruments Current-Mode PWM Controller 8-SOIC -40 to 85
UC2844DTRG4 Texas Instruments Current-Mode PWM Controller 14-SOIC -40 to 85
UC2844DG4 Texas Instruments Current-Mode PWM Controller 14-SOIC -40 to 85
UC2844D8 Texas Instruments Current-Mode PWM Controller 8-SOIC -40 to 85
UC2844DTR Texas Instruments Current-Mode PWM Controller 14-SOIC -40 to 85
UC2844D8G4 Texas Instruments Current-Mode PWM Controller 8-SOIC -40 to 85
UC2844N Texas Instruments Current-Mode PWM Controller 8-PDIP -40 to 85
UC2844D Texas Instruments Current-Mode PWM Controller 14-SOIC -40 to 85
UC2844 's PackagesUC2844 's pdf datasheet
UC2844D SOIC
UC2844D8 SOIC
UC2844D8G4 SOIC
UC2844D8TR SOIC
UC2844D8TRG4 SOIC
UC2844DG4 SOIC
UC2844DTR SOIC
UC2844DTRG4 SOIC
UC2844N PDIP
UC2844NG4 PDIP

UC2844 pdf datasheet download


UC2844 Pinout, Pinouts
UC2844 pinout,Pin out
This is one package pinout of UC2844,If you need more pinouts please download UC2844's pdf datasheet.

UC2844 Application circuits
UC2844 circuits
This is one application circuit of UC2844,If you need more circuits,please download UC2844's pdf datasheet.


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