UC3842 电流模式 PWM 控制器 | 德州仪器 TI.com.cn

UC3842 (正在供货) 电流模式 PWM 控制器

电流模式 PWM 控制器 - UC3842
数据表
 

描述

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 1 mA, and a precision reference trimmed for accuracy at the error amplifier input. Other internal circuits include logic to ensure 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, suitable for driving N-channel MOSFETs, is low when it 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 ideal choices for off-line power supplies, while the devices with a narrower hysteresis range are suited 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.

特性

  • Optimized for Off-Line and DC-to-DC Converters
  • Low Start-Up Current (< 1 mA)
  • 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 500-kHz Operation
  • Error Amplifier With Low Output Resistance

WEBENCH® Designer UC3842

 AC  DC  
AC 频率  60 Hz  50 Hz
Use Isolated Output?
  最小   最大 范围
VinRMS  V 18.50 ç»™拟 2000.00V
输出电压  V 3.3 ç»™拟 1000V
输出电流  A ≤ 100A
环境温度  °C 0 ç»™拟 70°C

参数

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Part number 立即下单 Topology Control method VCC (Min) (V) VCC (Max) (V) Frequency (Max) (kHz) UVLO thresholds on/off (V) Duty cycle (Max) (%) Gate drive (Typ) (A) Features Rating Operating temperature range (C) Package Group Package size: mm2:W x L (PKG)
UC3842 立即下单 Boost
Buck
Buck-Boost
Flyback
Forward    
Peak Current Mode     16     28     500     16/10     100     1     Adjustable Switching Frequency
Current Limiting
Dead Time Control
Error Amplifier
Multi-topology    
Catalog     0 to 70     PDIP | 8
SOIC | 14
SOIC | 8    
8PDIP: 93 mm2: 9.43 x 9.81 (PDIP | 8)
8SOIC: 19 mm2: 3.91 x 4.9 (SOIC | 8)
14SOIC: 52 mm2: 6 x 8.65 (SOIC | 14)    
UC3843 立即下单 Boost
Buck
Buck-Boost
Flyback
Forward    
Peak Current Mode     8.4     28     500     8.4/7.6     100     1     Adjustable Switching Frequency
Current Limiting
Dead Time Control
Error Amplifier
Multi-topology    
Catalog     0 to 70     PDIP | 8
SOIC | 14
SOIC | 8    
8PDIP: 93 mm2: 9.43 x 9.81 (PDIP | 8)
8SOIC: 19 mm2: 3.91 x 4.9 (SOIC | 8)
14SOIC: 52 mm2: 6 x 8.65 (SOIC | 14)    
UC3844 立即下单 Boost
Buck
Buck-Boost
Flyback
Forward    
Peak Current Mode     16     28     500     16/10     50     1     Adjustable Switching Frequency
Current Limiting
Dead Time Control
Error Amplifier
Multi-topology    
Catalog     0 to 70     PDIP | 8
SOIC | 14
SOIC | 8    
8PDIP: 93 mm2: 9.43 x 9.81 (PDIP | 8)
8SOIC: 19 mm2: 3.91 x 4.9 (SOIC | 8)
14SOIC: 52 mm2: 6 x 8.65 (SOIC | 14)    
UC3845 立即下单 Boost
Buck
Buck-Boost
Flyback
Forward    
Peak Current Mode     8.4     28     500     8.4/7.6     50     1     Adjustable Switching Frequency
Current Limiting
Dead Time Control
Error Amplifier
Multi-topology    
Catalog     0 to 70     PDIP | 8
SOIC | 14
SOIC | 8    
8PDIP: 93 mm2: 9.43 x 9.81 (PDIP | 8)
8SOIC: 19 mm2: 3.91 x 4.9 (SOIC | 8)
14SOIC: 52 mm2: 6 x 8.65 (SOIC | 14)