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Home > Semiconductors > ICs > STMicroelectronics UC3843AN Current Mode PWM Controller 1A 8-Pin PDIP

STMicroelectronics UC3843AN Current Mode PWM Controller 1A 8-Pin PDIP

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STMicroelectronics UC3843AN IC Switching Controllers 52kHz 1A Current PWM

STMicroelectronics UC3843AN Current Mode PWM Controller 1A 8-Pin PDIP

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STMicroelectronics SGS UC3843AN ADVANCED PWM CONTROLLER 3843 DIP8; Controller Type:PWM; Voltage Input Max:25V; Current Output Max:4A; Output Type:Totem Pole; Current Input:11mA; Energy Output per Cycle:55J; Frequency:500kHz; Power Dissipation:1W

  • Pulse Width Modulation (PWM) Controller IC
  • Input Voltage:25V
  • Output Voltage:15V
  • Output Current:1A
  • Frequency:450kHz
  • Supply Voltage Range:12V to 25V
  • Digital IC Case Style:DIP
  • No. of Pins:8
  • RoHS Compliant: Yes

The UC1842/3/4/5 family of control ICs provides the necessary features to im- plement off-line or DC to DC fixed frequency current mode control schemes with a minimal external parts count. Internally implemented circuits include un- der-voltage lockout featuring start up current less than 1mA, a precision refer- ence 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 out- put 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 16V (on) and 10V (off), ideally suited to off-line applica- tions. The corresponding thresholds for the UC1843 and UC1845 are 8.4V and 7.6V. 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.

Additional Information

Click here to Download Datasheet I
Click here to Download Datasheet II
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