UC2843B Datasheet | Unisonic Technologies

DESCRIPTION The UTC UC2843B provides off-line or DC-DC fixed-frequency current-mode control design with minimum external ponents. Internally-implemented circuits include an under-voltage lockout (UVLO) and a precision reference with accuracy at the error amplifier input. The UTC UC2843B also contain internal circuits which include a pulse width modulation (PWM) parator providing current-limit control, logic ensuring latched operation, and a totem-pole output stage designed to source or sink high-peak current. The output stage is low when it is in off-state condition and suitable for N-channel MOSFETs driving. The UTC UC2843B also has following advantages: the start-up current lower than 0.5m A while the oscillator discharge current is specified to 8.3m A (Typ.). In UVLO conditions, the output has a maximum saturation voltage of 1.2V when sinking 10m A @ VCC = 5V. The typical UVLO threshold of the UTC UC2843B is 8.4V (on) and 7.6V (off) and can operate to duty cycles approximately 100%. DIP-8 SOP-8 - FEATURES - Current mode operation:500 k Hz - Low start-up current value<0.5m A - Latching PWM for cycle-by-cycle current limiting - Trimmed oscillator discharge current - Automatic feed-forward pensation - Internally trimmed reference with UVLO - High-current totem-pole output UVLO with hysteresis - Double-pulse suppression - ORDERING INFORMATION Ordering Number Lead Free Halogen Free UC2843BL-D08-T UC2843BG-D08-T UC2843BL-S08-T UC2843BG-S08-T UC2843BL-S08-R UC2843BG-S08-R Package DIP-8 SOP-8 SOP-8 Packing Tube Tube Tape Reel UC2843BG-S08-R (1)Packing Type (2)Package Type (3)Green Package (1) T: Tube, R: Tape Reel (2) D08: DIP-8, S08: SOP-8 (3) G: Halogen Free and Lead Free, L: Lead Free .unisonic..tw Copyright © 2019 Unisonic Technologies Co., Ltd 1 of 9 QW-R103-048.E - MARKING DIP-8 - - 876 5 UTC UC3842B 1 23...