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Home STMicroelectronics UC3845ST SOIC14
UC3843ST SOIC14
UC3843ST SOIC14
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Microchip - DSPIC30F2010-20I/SO
Microchip - DSPIC30F2010-20I/SO

UC3845ST SOIC14

The UC284xB family of control ICs 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 a trimmed oscillator for precise DUTY CYCLE CONTROL under voltage lockout featuring start-up current less than 0.5mA, 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 UC2842B and UC2844B have UVLO thresholds of 16V (on) and 10V (off), ideally suited off-line applications The corresponding thresholds for the UC2843B and UC2845B are 8.5V and 7.9V. The UC2842B and UC2843B can operate to duty cycles approaching 100%. A range of the zero to < 50 % is obtained by the UC2844B and UC2845B by the addition of an internal toggle flip flop which blanks the output off every other clock cycle.

SKU: UC3845D013TR Category: STMicroelectronics
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Description

All features

  • LOW START-UP AND OPERATING CURRENT
  • UNDERVOLTAGE LOCKOUT WITH HYSTERESIS
  • INTERNALLY TRIMMED REFERENCE WITH UNDERVOLTAGE LOCKOUT
  • CURRENT LIMITING
  • TRIMMED OSCILLATOR FOR PRECISE FREQUENCY CONTROL
  • CURRENT MODE OPERATION TO 500kHz
  • OSCILLATOR FREQUENCY GUARANTEED AT 250kHz
  • LATCHING PWM FOR CYCLE-BY-CYCLE
  • HIGH CURRENT TOTEM POLE OUTPUT
  • AUTOMATIC FEED FORWARD COMPENSATION
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