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UC1842

Texas Instruments
Part Number UC1842
Manufacturer Texas Instruments
Description Current-Mode PWM Controller
Published Oct 16, 2019
Detailed Description UC1842, UC2842, UC3842, UC1843, UC2843, UC3843 UC1844, UC2844, UC3844, UC1845, UC2845, UC3845 SLUS223G – APRIL 1997 – RE...
Datasheet PDF File UC1842 PDF File

UC1842
UC1842

Overview
UC1842, UC2842, UC3842, UC1843, UC2843, UC3843 UC1844, UC2844, UC3844, UC1845, UC2845, UC3845 SLUS223G – APRIL 1997 – REVISED JULY 2022 UCx84x Current-Mode PWM Controllers 1 Features • Optimized for off-line and DC-to-DC converters • Low start-up current (< 1 mA) • Automatic feedforward compensation • Pulse-by-pulse current limiting • Enhanced load-response characteristics • Undervoltage lockout with hysteresis • Double-pulse suppression • High-current totem-pole output • Internally trimmed bandgap reference • Up to 500-kHz operation • Error amplifier with low output resistance 2 Applications • Switching regulators of any polarity • Transformer-coupled DC-DC converters 3 Description The UCx84x series of control integrated circuits provide the features that are necessary to implement off-line or DC-to-DC fixed-frequency current-mode control schemes, with a minimum number of external components.
The internally implemented circuits include an undervoltage lockout (UVLO), featuring a start-up current of less than 1 mA, and a precision reference trimmed for accuracy at the error amplifier input.
Other internal circuits include logic to ensure latched operation, a pulse-width modulation (PWM) comparator that also provides current-limit control, and a totem-pole output stage that is designed to source or sink high-peak current.
The output stage, suitable for driving N-channel MOSFETs, is low when it is in the off state.
VIN The UCx84x family offers a variety of package options, temperature range options, choice of maximum duty cycle, and choice of turnon and turnoff thresholds and hysteresis ranges.
Devices with higher turnon or turnoff hysteresis are ideal choices for offline power supplies, while the devices with a narrower hysteresis range are suited for DC-DC applications.
The UC184x devices are specified for operation from –55°C to 125°C, the UC284x series is specified for operation from –40°C to 85°C, and the UC384x series is specified for operation from 0°C to 70°...


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