전원 관리 AC/DC 및 DC/DC 컨트롤러(외장 FET)

UC3841

활성

32V, 1A, 0.5MHz 오프라인 PWM 컨트롤러, 0C~70C

제품 상세 정보

Vin (max) (V) 32 Operating temperature range (°C) 0 to 70 Control mode Peak current mode Topology Boost, Buck, Buck boost, Flyback, Forward Rating Catalog Features Error amplifier, Fixed frequency, Multi-topology, Soft start, Synchronization pin Duty cycle (max) (%) 100
Vin (max) (V) 32 Operating temperature range (°C) 0 to 70 Control mode Peak current mode Topology Boost, Buck, Buck boost, Flyback, Forward Rating Catalog Features Error amplifier, Fixed frequency, Multi-topology, Soft start, Synchronization pin Duty cycle (max) (%) 100
PDIP (N) 18 211.312 mm² 22.48 x 9.4
  • All Control, Driving, Monitoring, and Protection Functions Included
  • Low-current, Off-line Start Circuit
  • Voltage Feed Forward or Current Mode Control
  • Guaranteed Duty Cycle Clamp
  • PWM Latch for Single Pulse per Period
  • Pulse-by-Pulse Current Limiting Plus Shutdown for Over-Current Fault
  • No Start-up or Shutdown Transients
  • Slow Turn-on Both Initially and After Fault Shutdown
  • Shutdown Upon Over- or Under-Voltage Sensing
  • Latch Off or Continuous Retry After Fault
  • PWM Output Switch Usable to 1A Peak Current
  • 1% Reference Accuracy
  • 500kHz Operation
  • 18 Pin DIL Package
  • All Control, Driving, Monitoring, and Protection Functions Included
  • Low-current, Off-line Start Circuit
  • Voltage Feed Forward or Current Mode Control
  • Guaranteed Duty Cycle Clamp
  • PWM Latch for Single Pulse per Period
  • Pulse-by-Pulse Current Limiting Plus Shutdown for Over-Current Fault
  • No Start-up or Shutdown Transients
  • Slow Turn-on Both Initially and After Fault Shutdown
  • Shutdown Upon Over- or Under-Voltage Sensing
  • Latch Off or Continuous Retry After Fault
  • PWM Output Switch Usable to 1A Peak Current
  • 1% Reference Accuracy
  • 500kHz Operation
  • 18 Pin DIL Package

The UC1841 family of PWM controllers has been designed to increase the level of versatility while retaining all of the performance features of the earlier UC1840 devices. While still optimized for highly-efficient boot-strapped primary-side operation in forward or flyback power converters, the UC1841 is equally adept in implementing both low and high voltage input DC to DC converters. Important performance features include a low-current starting circuit, linear feed-forward for constant volt-second operation, and compatibility with either voltage or current mode topologies.

In addition to start-up and normal regulating PWM functions, these devices include built in protection from over-voltage, under-voltage, and over-current fault conditions with the option for either latch-off or automatic restart.

While pin compatible with the UC1840 in all respects except that the polarity of the External Stop has been reversed, the UC1841 offers the following improvements:

1. Fault latch reset is accomplished with slow start discharge rather than recycling the input voltage to the chip.

2. The External Stop input can be used for a fault delay to resist shutdown from short duration transients.

3. The duty-cycle clamping function has been characterized and specified.

The UC1841 is characterized for -55°C to +125°C operation while the UC2841 and UC3841 are designed for -25°C to +85°C and 0°to +70°C, respectively.

The UC1841 family of PWM controllers has been designed to increase the level of versatility while retaining all of the performance features of the earlier UC1840 devices. While still optimized for highly-efficient boot-strapped primary-side operation in forward or flyback power converters, the UC1841 is equally adept in implementing both low and high voltage input DC to DC converters. Important performance features include a low-current starting circuit, linear feed-forward for constant volt-second operation, and compatibility with either voltage or current mode topologies.

In addition to start-up and normal regulating PWM functions, these devices include built in protection from over-voltage, under-voltage, and over-current fault conditions with the option for either latch-off or automatic restart.

While pin compatible with the UC1840 in all respects except that the polarity of the External Stop has been reversed, the UC1841 offers the following improvements:

1. Fault latch reset is accomplished with slow start discharge rather than recycling the input voltage to the chip.

2. The External Stop input can be used for a fault delay to resist shutdown from short duration transients.

3. The duty-cycle clamping function has been characterized and specified.

The UC1841 is characterized for -55°C to +125°C operation while the UC2841 and UC3841 are designed for -25°C to +85°C and 0°to +70°C, respectively.

다운로드

관심 가지실만한 유사 제품

open-in-new 대안 비교
비교 대상 장치와 동일한 기능을 지원하는 핀 대 핀
UCC28C53 활성 산업용, 30V, 저전력 전류 모드 PWM 컨트롤러, 8.4V/7.6V UVLO, 100% 듀티 사이클 Lower startup and supply current, better reference voltage accuracy and faster overcurrent protection

기술 자료

star =TI에서 선정한 이 제품의 인기 문서
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* Data sheet Programmable, Off-Line, PWM Controller datasheet 1999/09/05

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

지원 및 교육

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