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
UC3844DTR Texas Instruments Current-Mode PWM Controller 14-SOIC 0 to 70
UC3844ADG4 Texas Instruments Current Mode PWM Controller 14-SOIC 0 to 70
UC3844AQ Texas Instruments 1A SWITCHING CONTROLLER, 500kHz SWITCHING FREQ-MAX, PQCC20, PLASTIC, LCC-20
UC3844DTRG4 Texas Instruments Current-Mode PWM Controller 14-SOIC 0 to 70
UC3844ADTR Texas Instruments Current Mode PWM Controller 14-SOIC 0 to 70
UC3844DG4 Texas Instruments Current-Mode PWM Controller 14-SOIC 0 to 70
UC3844AD8TRG4 Texas Instruments Current Mode PWM Controller 8-SOIC 0 to 70
UC3844AL Texas Instruments 1A SWITCHING CONTROLLER, 500kHz SWITCHING FREQ-MAX, CQCC20, LCC-20
UC3844N Texas Instruments Current-Mode PWM Controller 8-PDIP 0 to 70
UC3844ADTRG4 Texas Instruments Current Mode PWM Controller 14-SOIC 0 to 70
UC3844 's PackagesUC3844 's pdf datasheet
UC3844D SOIC
UC3844D8 SOIC
UC3844D8G4 SOIC
UC3844D8TR SOIC
UC3844D8TRG4 SOIC
UC3844DG4 SOIC
UC3844DTR SOIC
UC3844DTRG4 SOIC
UC3844N PDIP
UC3844NG4 PDIP
UC3844P PDIP




UC3844 Pinout, Pinouts
UC3844 pinout,Pin out
This is one package pinout of UC3844,If you need more pinouts please download UC3844's pdf datasheet.

UC3844 Application circuits
UC3844 circuits
This is one application circuit of UC3844,If you need more circuits,please download UC3844's pdf datasheet.


Related Electronics Part Number

Related Keywords:

UC3844 Pb-Free UC3844 Cross Reference UC3844 Schematic UC3844 Distributor
UC3844 Application Notes UC3844 RoHS UC3844 Circuits UC3844 footprint