UC3526 (ACTIVE)

Regulating Pulse Width Modulator

Description

The UC1526 is a high performance monolithic pulse width modulator circuit designed for fixed-frequency switching regulators and other power control applications. Included in an 18-pin dual-in-line package are a temperature compensated voltage reference, sawtooth oscillator, error amplifier, pulse width modulator, pulse metering and setting logic, and two low impedance power drivers. Also included are protective features such as soft-start and under-voltage lockout, digital current limiting, double pulse inhibit, a data latch for single pulse metering, adjustable deadtime, and provision for symmetry correction inputs. For ease of interface, all digital control ports are TTL and B-series CMOS compatible. Active LOW logic design allows wired-OR connections for maximum flexibility. This versatile device can be used to implement single-ended or push-pull switching regulators of either polarity, both transformerless and transformer coupled. The UC1526 is characterized for operation over the full military temperature range of -55°C to +125°C. The UC2526 is characterized for operation from -25°C to +85°C, and the UC3526 is characterized for operation from 0° to +70°C.

Features

  • 8 To 35V Operation
  • 5V Reference Trimmed To ±1%
  • 1Hz To 400kHz Oscillator Range
  • Dual 100mA Source/Sink Outputs
  • Digital Current Limiting
  • Double Pulse Suppression
  • Programmable Deadtime
  • Under-Voltage Lockout
  • Single Pulse Metering
  • Programmable Soft-Start
  • Wide Current Limit Common Mode Range
  • TTL/CMOS Compatible Logic Ports
  • Symmetry Correction Capability
  • Guaranteed 6 Unit Synchronization

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Parametrics Compare all products in PWM and Resonant Controller

 
Topology
Control Method
Duty Cycle (Max) (%)
Frequency (Max) (kHz)
UVLO Thresholds On/Off (V)
Regulated Outputs (#)
Special Features
Rating
Operating Temperature Range (C)
Pin/Package
Approx. Price (US$)
UC3526 UC1526 UC2526
Boost
Flyback
Forward
Full-Bridge
Half-Bridge
Push-Pull    
Boost
Flyback
Forward
Full-Bridge
Half-Bridge
Push-Pull    
Boost
Flyback
Forward
Full-Bridge
Half-Bridge
Push-Pull    
Voltage     Voltage     Voltage    
50     50     50    
450     450     450    
7/6.8     7/6.8     7/6.8    
2     2     2    
Error Amplifier
Soft Start
Synchronization Pin    
Error Amplifier
Soft Start
Synchronization Pin    
Error Amplifier
Soft Start
Synchronization Pin    
Catalog     Military     Catalog    
0 to 70     -55 to 125     -25 to 85    
18PDIP
18SOIC    
18CDIP
20LCCC    
18PDIP    
1.05 | 1ku       1.61 | 1ku    

Other qualified versions of UC3526

Version Part Number Definition
Military UC1526 QML certified for Military and Defense Applications
Catalog UC3526M TI's standard catalog product

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