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
UC1845J883B Texas Instruments Current Mode PWM Controller 8-CDIP -55 to 125
UC1845L Texas Instruments Current Mode PWM Controller 20-LCCC -55 to 125
UC1845AJ Texas Instruments Current Mode PWM Controller 8-CDIP -55 to 125
UC1845L/883BC Texas Instruments 1A SWITCHING CONTROLLER, 500kHz SWITCHING FREQ-MAX, CQCC20
UC1845L883B Texas Instruments Current Mode PWM Controller 20-LCCC -55 to 125
UC1845AJ883B Texas Instruments Current Mode PWM Controller 8-CDIP -55 to 125
UC1845J/883BC Texas Instruments 1A SWITCHING CONTROLLER, 500kHz SWITCHING FREQ-MAX, CDIP8
UC1845W Texas Instruments Current Mode PWM Controller 14-CFP -55 to 125
UC1845AL883B Texas Instruments Current Mode PWM Controller 20-LCCC -55 to 125
UC1845AJ/883BC Texas Instruments 1A SWITCHING CONTROLLER, 500kHz SWITCHING FREQ-MAX, CDIP8
UC1845 's PackagesUC1845 's pdf datasheet



UC1845 Pinout, Pinouts
UC1845 pinout,Pin out
This is one package pinout of UC1845,If you need more pinouts please download UC1845's pdf datasheet.

UC1845 Application circuits
UC1845 circuits
This is one application circuit of UC1845,If you need more circuits,please download UC1845's pdf datasheet.


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