전원 관리 AC/DC 및 DC/DC 컨트롤러(외장 FET)

UC3844

활성

16V/10V UVLO 50% 듀티 사이클, 0C~70C를 지원하는 단일 종단 500KHz 전류 모드 PWM 컨트롤러

제품 상세 정보

Vin (max) (V) 28 Operating temperature range (°C) 0 to 70 Control mode Peak current mode Topology Boost, Buck, Buck boost, Flyback, Forward Rating Catalog Features Adjustable switching frequency, Current limiting, Dead time control, Error amplifier, Fixed frequency, Multi-topology Duty cycle (max) (%) 50
Vin (max) (V) 28 Operating temperature range (°C) 0 to 70 Control mode Peak current mode Topology Boost, Buck, Buck boost, Flyback, Forward Rating Catalog Features Adjustable switching frequency, Current limiting, Dead time control, Error amplifier, Fixed frequency, Multi-topology Duty cycle (max) (%) 50
PDIP (P) 8 92.5083 mm² 9.81 x 9.43 SOIC (D) 14 51.9 mm² 8.65 x 6 SOIC (D) 8 29.4 mm² 4.9 x 6
  • 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
  • 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.

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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관심 가지실만한 유사 제품

open-in-new 대안 비교
비교 대상 장치보다 업그레이드된 기능을 지원하는 드롭인 대체품
UC3844A 활성 16V/10V UVLO 50% 듀티 사이클, 0°C~70°C를 지원하는 30V, 1A, 500KHz 전류 모드 PWM 컨트롤러 Pin-to-pin equivalent with reduced startup current
비교 대상 장치와 동일한 기능을 지원하는 핀 대 핀
TL2844B 활성 16V/10V UVLO, 50% 듀티 사이클, -40C~85C를 지원하는 30V, 0.2A 고성능 500KHz 전류 모드 PWM Wider temperature range
UCC28C59 활성 산업용, 30V, 저전력 전류 모드 PWM 컨트롤러, SiC용 16V/12.5V UVLO, 50% 듀티 사이클 Lower startup and supply current, better reference voltage accuracy and faster overcurrent protection

기술 자료

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15개 모두 보기
유형 직함 날짜
* Data sheet UCx84x Current-Mode PWM Controllers datasheet (Rev. H) PDF | HTML 2024/10/11
Application note Conditioning a Switch-mode Power Supply Current Signal Using TI Op Amps (Rev. A) PDF | HTML 2021/06/11
Application note Understanding Inverting Buck-Boost Power Stages in Switch Mode Power Supplies (Rev. B) 2019/03/12
Selection guide Power Management Guide 2018 (Rev. R) 2018/06/25
Technical article When should you use PWM controllers? PDF | HTML 2016/12/02
Application note UCC38C42 Family of High-Speed BiCMOS Current-Mode PWM Controllers 2002/02/07
Application note DN-26 UC3842A Low-Cost Start-up and Fault Protection Circuit 1999/09/05
Application note DN-27 UC1842/UC1842A Family - Summary of Functional Differences 1999/09/05
Application note DN-40 The Effects of Oscillator Discharge Current Variations on Maximum Duty 1999/09/05
Application note DN-42A Design Considerations for Transitioning from UC3842 to the New UCC3802 1999/09/05
Application note DN-65 Considerations in Powering BiCMOS ICs 1999/09/05
Application note U-100A UC3842/3/4/5 Provides Low-Cost Current-Mode Control 1999/09/05
Application note U-111, Practical Considerations in Current Mode Power Supplies 1999/09/05
Application note Understanding Boost Power Stages In Switchmode Power Supplies 1999/03/04
Application note Understanding Buck Power Stages In Switchmode Power Supplies 1999/03/04

설계 및 개발

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패키지 CAD 기호, 풋프린트 및 3D 모델
PDIP (P) 8 Ultra Librarian
SOIC (D) 14 Ultra Librarian
SOIC (D) 8 Ultra Librarian

주문 및 품질

포함된 정보:
  • RoHS
  • REACH
  • 디바이스 마킹
  • 납 마감/볼 재질
  • MSL 등급/피크 리플로우
  • MTBF/FIT 예측
  • 물질 성분
  • 인증 요약
  • 지속적인 신뢰성 모니터링
포함된 정보:
  • 팹 위치
  • 조립 위치

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