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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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

Parametrics

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Part number Order 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)
UC3842A Order now 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    
Catalog     0 to 70     PDIP | 8
SOIC | 14
SOIC | 16
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)
16SOIC: 77 mm2: 7.5 x 10.3 (SOIC | 16)    
UC3843A Order now Boost
Buck
Flyback
Forward    
Current     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)    
UC3844A Order now 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)    
UC3845A Order now 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)