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参数资料
| 型号： | 5962-89920022A |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 0.4 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, CQCC20 |
| 封装： | LCC-20 |
| 文件页数： | 3/12页 |
| 文件大小： | 978K |
| 代理商： | 5962-89920022A |
Features
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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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All Control, Driving, Monitoring, and Protection Functions Included
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Low-current, Off-line Start Circuit
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Voltage Feed Forward or Current Mode Control
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Guaranteed Duty Cycle Clamp
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PWM Latch for Single Pulse per Period
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Pulse-by-Pulse Current Limiting Plus Shutdown for Over-Current Fault
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No Start-up or Shutdown Transients
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Slow Turn-on Both Initially and After Fault Shutdown
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Shutdown Upon Over- or Under-Voltage Sensing
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Latch Off or Continuous Retry After Fault
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PWM Output Switch Usable to 1A Peak Current
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1% Reference Accuracy
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500kHz Operation
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18 Pin DIL Package
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