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
UC3845AJ Texas Instruments Current Mode PWM Controller 8-CDIP 0 to 70
UC3845AM 's PackagesUC3845AM 's pdf datasheet

UC3845AM Pinout, Pinouts
UC3845AM pinout,Pin out
This is one package pinout of UC3845AM,If you need more pinouts please download UC3845AM's pdf datasheet.

UC3845AM Application circuits
UC3845AM circuits
This is one application circuit of UC3845AM,If you need more circuits,please download UC3845AM's pdf datasheet.

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