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

View more

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
Boost
Flyback
Forward   
Boost
Flyback
Forward   
Boost
Flyback
Forward   
Boost
Flyback
Forward   
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
Multi-topology   
Adjustable Switching Frequency
Error Amplifier
Multi-topology   
Adjustable Switching Frequency
Error Amplifier
Multi-topology   
Adjustable Switching Frequency
Error Amplifier
Multi-topology   
Catalog    Catalog    Catalog    Catalog   
0 to 70    0 to 70    0 to 70    0 to 70   
14SOIC
8PDIP
8SOIC   
14SOIC
8PDIP
8SOIC   
14SOIC
8PDIP
8SOIC   
14SOIC
8PDIP
8SOIC   
0.26 | 1ku    0.26 | 1ku    0.28 | 1ku    0.28 | 1ku   

WEBENCH® Designer TL3843

AC Frequency  60 Hz  50 Hz
  Min   Max Range
VinRMS  V 15.0 to 480.0V
Vout  V 3.3 to 50V
Iout  A ≤ 20A
Ambient Temp  °C 0 to 70°C