UC3842A (ACTIVE)

Current Mode PWM Controller

Current Mode PWM Controller - UC3842A
Datasheet
 

Description

The UCx84xA family of control devices is a pin-for-pin compatible improved version of the UCx84x family. Providing the necessary features to control current-mode or switched-mode power supplies, this family of devices has many improved features: startup current is less than 0.5 mA, oscillator discharge is trimmed to 8.3 mA, and during UVLO, the output stage can sink at least 10 mA at less than 1.2 V for VCC over 5 V.

Features

  • Optimized for Off-Line and DC-DC Converters
  • Low Start-Up Current (< 0.5 mA)
  • Trimmed Oscillator Discharge Current
  • 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
  • Create a Custom Design Using the UCx84xA With the WEBENCH® Power Designer

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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) (%)
Gate Drive (Typ) (A)
Features
Rating
Operating Temperature Range (C)
Pin/Package
UC3842A UC1842A UC2842A
Boost
Buck
Buck-Boost
Flyback
Forward   
Boost
Flyback
Forward   
Boost
Buck
Buck-Boost
Flyback
Forward   
Peak Current Mode    Current    Peak Current Mode   
16    10    16   
400    30    400   
500    500    500   
16/10    16/10    16/10   
100    100    100   
1    1    1   
Error Amplifier    Error Amplifier
Multi-topology   
Error Amplifier
Multi-topology   
Catalog    Military    Catalog   
0 to 70    -55 to 125    -40 to 85   
14SOIC
16SOIC
8PDIP
8SOIC   
20LCCC
8CDIP   
14SOIC
16SOIC
8PDIP
8SOIC   

Other qualified versions of UC3842A

Version Part Number Definition
Military UC1842A QML certified for Military and Defense Applications
Enhanced Product UC1842A-EP Supports Defense, Aerospace and Medical Applications
Space UC1842A-SP Radiation tolerant, ceramic packaging and qualified for use in Space-based application

WEBENCH® Designer UC3842A

 AC  DC  
AC Frequency  60 Hz  50 Hz
Use Isolated Output?
  Min   Max Range
VinRMS  V 20.00 to 480.00V
Vout  V 3.3 to 50.0V
Iout  A ≤ 20.0A
Ambient Temp  °C 0 to 70°C