Current-Mode PWM Controller - TL3843

TL3843 (ACTIVE)

Current-Mode PWM Controller

 

Description

The TL284x and TL384x 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. Some of the internally implemented circuits are 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 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.

Features

  • Optimized for Off-Line and DC-to-DC Converters
  • Low Start-Up Current (< 1 mA)
  • Automatic Feed-forward 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
  • 500-kHz Operation
  • Error Amplifier With Low Output Resistance
  • Designed to be Interchangeable with UC2842 and UC3842 Series

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Parametrics Compare all products in PWM and Resonant Controller

 
Topology
Control Method
Vin (Min) (V)
Vin (Max) (V)
Frequency (Max) (kHz)
UVLO Thresholds On/Off (V)
Duty Cycle (Max) (%)
Special Features
Rating
Operating Temperature Range (C)
Pin/Package
Approx. Price (US$)
TL3843 TL3842 TL3844 TL3845
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Current     Current     Current     Current    
9     17.5     17.5     9    
30     30     30     30    
500     500     500     500    
8.4/7.6     16/10     16/10     8.4/7.6    
100     100     50     50    
Adjustable Switching Frequency
Error Amplifier    
Adjustable Switching Frequency
Error Amplifier    
Adjustable Switching Frequency
Error Amplifier    
Adjustable Switching Frequency
Error Amplifier    
Catalog     Catalog     Catalog     Catalog    
0 to 70     0 to 70     0 to 70     0 to 70    
14SOIC
8PDIP
8SOIC    
14SOIC
8SOIC
8PDIP    
14SOIC
8PDIP
8SOIC    
14SOIC
8PDIP
8SOIC    
0.26 | 1ku     0.26 | 1ku     0.28 | 1ku     0.28 | 1ku    

Related end equipment

  • Switching regulators of any polarity
  • Transformer-coupled DC/DC convertors

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WEBENCH® Designer TL3843

 AC  DC  
AC Frequency  60 Hz  50 Hz
Use Isolated Output?
  Min   Max Range
VinRMS  V 20.00 to 300.00V
Vout  V 3.3 to 50.0V
Iout  A ≤ 20.0A
Ambient Temp  °C 0 to 70°C