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
UC1842J883B Rochester Electronics LLC 1A SWITCHING CONTROLLER, 500kHz SWITCHING FREQ-MAX, CDIP8, CERAMIC, DIP-8
UC1842A Rochester Electronics LLC Switching Controller
UC1842AJQMLV Rochester Electronics LLC Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, CDIP8, CERAMIC, DIP-8
UC1842AL Rochester Electronics LLC Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, CQCC20, CERAMIC, LCC-20
UC1842ALQMLV Rochester Electronics LLC Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, CQCC20, CERAMIC, LCC-20
UC1842JQMLV Rochester Electronics LLC Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, CDIP8, CERAMIC, DIP-8
UC1842W Rochester Electronics LLC PWM
UC1842J/883B Rochester Electronics LLC Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, CDIP8
UC1842AMDREP Rochester Electronics LLC PWM
UC1842AJ883B Rochester Electronics LLC PWM
UC1842 's PackagesUC1842 's pdf datasheet



UC1842 Pinout, Pinouts
UC1842 pinout,Pin out
This is one package pinout of UC1842,If you need more pinouts please download UC1842's pdf datasheet.

UC1842 Application circuits
UC1842 circuits
This is one application circuit of UC1842,If you need more circuits,please download UC1842's pdf datasheet.


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