UC3842B, UC3843B, UC2842B, UC2843B Description: The UC3842B, UC3843B series are high performance fixed frequency current mode controllers. They are specifically designed for Off-Line and DC-DC converter applications offering the designer a cost-effective solution with minimal external components. These integrated circuits feature a trimmed oscillator for precise duty cycle control, a temperature compensated reference, high gain error amplifier, current sensing comparator, and a high current totem pole output ideally suited for driving a power MOSFET. Also included are protective features consisting of input and reference undervoltage lockouts each with hysteresis, cycle-by-cycle current limiting, programmable output deadtime, and a latch for single pulse metering. These devices are available in an 8-pin dual-in-line and surface mount (SOIC-8) plastic package as well as the 14-pin plastic surface mount (SOIC-14). The SOIC-14 package has separate power and ground pins for the totem pole output stage. The UCX842B has UVLO thresholds of 16 V (on) and 10 V (off), ideally suited for off-line converters. The UCX843B is tailored for lower voltage applications having UVLO thresholds of 8.5 V (on) and 7.6 V (off). Features - Trimmed Oscillator for Precise Frequency Control - Oscillator Frequency Guaranteed at 250 kHz - Current Mode Operation to 500 kHz - Automatic Feed Forward Compensation - Latching PWM for Cycle-By-Cycle Current Limiting - Internally Trimmed Reference with Undervoltage Lockout - High Current Totem Pole Output - Undervoltage Lockout with Hysteresis - Low Startup and Operating Current - This is a Pb-Free and Halide-Free Device Application: - General indicating and lighting purposes Product Group and package data: - Product group: LED - Package: 5 mm - Product series: standard - Angle of half intensity: ± 30° https://elecena.pl/product/9697305/uc2842bn-pwm-controller-current-mode-250-khz-200-maout-dip-8 2017-08-05 https://elecena.pl/product/9697305/uc2842bn-pwm-controller-current-mode-250-khz-200-maout-dip-8 2018-05-05 https://elecena.pl/product/9697305/uc2842bn-pwm-controller-current-mode-250-khz-200-maout-dip-8 2018-12-16 https://elecena.pl/product/9697305/uc2842bn-pwm-controller-current-mode-250-khz-200-maout-dip-8 2021-04-27 https://elecena.pl/product/9697305/uc2842bn-pwm-controller-current-mode-250-khz-200-maout-dip-8 2025-02-02 https://elecena.pl/product/9697305/uc2842bn-pwm-controller-current-mode-250-khz-200-maout-dip-8 2025-12-28 https://elecena.pl/product/9697305/uc2842bn-pwm-controller-current-mode-250-khz-200-maout-dip-8 2026-01-21 https://elecena.pl/product/9697305/uc2842bn-pwm-controller-current-mode-250-khz-200-maout-dip-8 2026-10-04