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UC3841

正在供貨

具有 0°C 至 70 °C 工作溫度范圍的 32V、1A、0.5MHz 離線式 PWM 控制器

產(chǎn)品詳情

Topology Boost, Buck, Buck boost, Flyback, Forward Control mode Peak current mode Features Error amplifier, Fixed frequency, Multi-topology, Soft start, Synchronization pin Duty cycle (max) (%) 100
Topology Boost, Buck, Buck boost, Flyback, Forward Control mode Peak current mode 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.
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* 數(shù)據(jù)表 Programmable, Off-Line, PWM Controller 數(shù)據(jù)表 1999年 9月 5日

訂購和質(zhì)量

包含信息：
  • RoHS
  • REACH
  • 器件標識
  • 引腳鍍層/焊球材料
  • MSL 等級/回流焊峰值溫度
  • MTBF/時基故障估算
  • 材料成分
  • 鑒定摘要
  • 持續(xù)可靠性監(jiān)測
包含信息：
  • 制造廠地點
  • 封裝廠地點

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