UC3843 電流モード PWM コントローラ | TIJ.co.jp

UC3843
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電流モード PWM コントローラ

電流モード PWM コントローラ - UC3843
データシート
 

概要

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.

特長

  • 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 UC3843

 AC  DC  
AC 周波数  60 Hz  50 Hz
Use Isolated Output?
  最小   最大 範囲
VinRMS  V 10.00 − 2000.00V
出力電圧  V 3.3 − 1000V
負荷電流  A ≤ 100A
周囲温度  °C 0 − 70°C

機能一覧

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Part number オーダー・オプション 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)
UC3843 ご注文 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)    
UC3842 ご注文 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)    
UC3844 ご注文 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 ご注文 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)