UC3842A Current Mode PWM Controller | TI.com

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 controllers & resonant controllers

 
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)
Pin/Package
UC3842A UC3843A UC3844A UC3845A
Boost
Buck
Buck-Boost
Flyback
Forward    
Boost
Buck
Flyback
Forward    
Boost
Buck
Buck-Boost
Flyback
Forward    
Boost
Buck
Buck-Boost
Flyback
Forward    
Peak Current Mode     Current     Peak Current Mode     Peak Current Mode    
16     8.4     16     8.4    
28     28     28     28    
500     500     500     500    
16/10     8.4/7.6     16/10     8.4/7.6    
100     100     50     50    
1     1     1     1    
Adjustable Switching Frequency
Current Limiting
Dead Time Control
Error Amplifier    
Adjustable Switching Frequency
Current Limiting
Dead Time Control
Error Amplifier
Multi-topology    
Adjustable Switching Frequency
Current Limiting
Dead Time Control
Error Amplifier
Multi-topology    
Adjustable Switching Frequency
Current Limiting
Dead Time Control
Error Amplifier
Multi-topology    
Catalog     Catalog     Catalog     Catalog    
0 to 70     0 to 70     0 to 70     0 to 70    
14SOIC
16SOIC
8PDIP
8SOIC    
14SOIC
8PDIP
8SOIC    
14SOIC
8PDIP
8SOIC    
14SOIC
8PDIP
8SOIC    

Design tool

WEBENCH® Designer UC3842A

 AC  DC  
AC Frequency  60 Hz  50 Hz
Use Isolated Output?
  Min   Max Range
VinRMS  V 18.50 to 2000.00V
Vout  V 3.3 to 1000V
Iout  A ≤ 100A
Ambient Temp  °C 0 to 70°C