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. https://elecena.pl/product/16964387/uc3845bd1-current-mode-pwm 2020-06-12 https://elecena.pl/product/16964387/uc3845bd1-current-mode-pwm 2021-04-03 https://elecena.pl/product/16964387/uc3845bd1-current-mode-pwm 2021-04-15 https://elecena.pl/product/16964387/uc3845bd1-current-mode-pwm 2021-07-17 https://elecena.pl/product/16964387/uc3845bd1-current-mode-pwm 2021-12-04 https://elecena.pl/product/16964387/uc3845bd1-current-mode-pwm 2022-06-13 https://elecena.pl/product/16964387/uc3845bd1-current-mode-pwm 2022-06-25 https://elecena.pl/product/16964387/uc3845bd1-current-mode-pwm 2022-10-10 https://elecena.pl/product/16964387/uc3845bd1-current-mode-pwm 2023-03-23 https://elecena.pl/product/16964387/uc3845bd1-current-mode-pwm 2023-04-08 https://elecena.pl/product/16964387/uc3845bd1-current-mode-pwm 2023-12-22 https://elecena.pl/product/16964387/uc3845bd1-current-mode-pwm 2024-01-25 https://elecena.pl/product/16964387/uc3845bd1-current-mode-pwm 2024-08-07 https://elecena.pl/product/16964387/uc3845bd1-current-mode-pwm 2024-08-25 https://elecena.pl/product/16964387/uc3845bd1-current-mode-pwm 2024-09-12 https://elecena.pl/product/16964387/uc3845bd1-current-mode-pwm 2024-09-28 https://elecena.pl/product/16964387/uc3845bd1-current-mode-pwm 2024-10-07 https://elecena.pl/product/16964387/uc3845bd1-current-mode-pwm 2024-10-16 https://elecena.pl/product/16964387/uc3845bd1-current-mode-pwm 2024-11-02 https://elecena.pl/product/16964387/uc3845bd1-current-mode-pwm 2024-11-20 https://elecena.pl/product/16964387/uc3845bd1-current-mode-pwm 2025-06-16 https://elecena.pl/product/16964387/uc3845bd1-current-mode-pwm 2025-07-04 https://elecena.pl/product/16964387/uc3845bd1-current-mode-pwm 2025-07-13 https://elecena.pl/product/16964387/uc3845bd1-current-mode-pwm 2025-08-01 https://elecena.pl/product/16964387/uc3845bd1-current-mode-pwm 2025-09-16 https://elecena.pl/product/16964387/uc3845bd1-current-mode-pwm 2025-10-30