UC2843
30-V, 1-A, 500KHz current mode PWM controller with 8.4V/7.6V UVLO 100% duty cycle, -40C to 85C
UC2843
- Optimized for off-line and DC-to-DC converters
- Low start-up current (< 1mA)
- 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 500kHz operation
- Error amplifier with low output resistance
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 1mA, and a precision reference trimmed for accuracy at the error amplifier input. Other internal circuits include logic to provide 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, designed for driving N-channel MOSFETs, is low when the output stage is in the off state.
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 good choices for off-line power supplies, while the devices with a narrower hysteresis range are designed 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°C.
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Technical documentation
Type | Title | Date | ||
---|---|---|---|---|
* | Data sheet | UCx84x Current-Mode PWM Controllers datasheet (Rev. H) | PDF | HTML | 11 Oct 2024 |
Application note | Conditioning a Switch-mode Power Supply Current Signal Using TI Op Amps (Rev. A) | PDF | HTML | 11 Jun 2021 | |
Application note | Understanding Inverting Buck-Boost Power Stages in Switch Mode Power Supplies (Rev. B) | 12 Mar 2019 | ||
Selection guide | Power Management Guide 2018 (Rev. R) | 25 Jun 2018 | ||
Application note | UCC38C42 Family of High-Speed BiCMOS Current-Mode PWM Controllers | 07 Feb 2002 | ||
Application note | DN-26 UC3842A Low-Cost Start-up and Fault Protection Circuit | 05 Sep 1999 | ||
Application note | DN-27 UC1842/UC1842A Family - Summary of Functional Differences | 05 Sep 1999 | ||
Application note | DN-40 The Effects of Oscillator Discharge Current Variations on Maximum Duty | 05 Sep 1999 | ||
Application note | DN-42A Design Considerations for Transitioning from UC3842 to the New UCC3802 | 05 Sep 1999 | ||
Application note | DN-65 Considerations in Powering BiCMOS ICs | 05 Sep 1999 | ||
Application note | U-100A UC3842/3/4/5 Provides Low-Cost Current-Mode Control | 05 Sep 1999 | ||
Application note | U-111, Practical Considerations in Current Mode Power Supplies | 05 Sep 1999 | ||
Application note | Understanding Boost Power Stages In Switchmode Power Supplies | 04 Mar 1999 | ||
Application note | Understanding Buck Power Stages In Switchmode Power Supplies | 04 Mar 1999 |
Design & development
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UCC28C43 PSpice Transient Model
UCCx8C43 Unencrypted PSpice Transient Model
Package | Pins | CAD symbols, footprints & 3D models |
---|---|---|
PDIP (P) | 8 | Ultra Librarian |
SOIC (D) | 14 | Ultra Librarian |
SOIC (D) | 8 | Ultra Librarian |
Ordering & quality
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Support & training
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