UC1825 High Speed PWM Controller | TI.com

UC1825 (ACTIVE)

High Speed PWM Controller

High Speed PWM Controller - UC1825
Datasheet
 

Description

The UC1825 family of PWM control ICs is optimized for high frequency switched mode power supply applications. Particular care was given to minimizing propagation delays through the comparators and logic circuitry while maximizing bandwidth and slew rate of the error amplifier. This controller is designed for use in either current-mode or voltage mode systems with the capability for input voltage feed-forward.

Protection circuitry includes a current limit comparator with a 1V threshold, a TTL compatible shutdown port, and a soft start pin which will double as a maximum duty cycle clamp. The logic is fully latched to provide jitter free operation and prohibit multiple pulses at an output. An under-voltage lockout section with 800mV of hysteresis assures low start up current. During under-voltage lockout, the outputs are high impedance.

These devices feature totem pole outputs designed to source and sink high peak currents from capacitive loads, such as the gate of a power MOSFET. The on state is designed as a high level.

Features

  • Compatible with Voltage or Current Mode Topologies
  • Practical Operation Switching Frequencies to 1MHz
  • 50ns Propagation Delay to Output
  • High Current Dual Totem Pole Outputs (1.5A Peak)
  • Wide Bandwidth Error Amplifier
  • Fully Latched Logic with Double Pulse Suppression
  • Pulse-by-Pulse Current Limiting
  • Soft Start / Max. Duty Cycle Control
  • Under-Voltage Lockout with Hysteresis
  • Low Start Up Current (1.1mA)

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Parametrics Compare all products in Offline and Isolated DC/DC Controller and Converter

 
Control Method
Vin (Min) (V)
Vin (Max) (V)
Topology
Duty Cycle (Max) (%)
Frequency (Max) (kHz)
UVLO Thresholds On/Off (V)
Features
Rating
Operating Temperature Range (C)
Package Group
Package Size: mm2:W x L (PKG)
UC1825
Current    
8.4    
30    
Boost
Flyback
Forward
Full-Bridge
Half-Bridge
Push-Pull    
80    
1000    
9.2/8.4    
Error Amplifier
Soft Start
Synchronization Pin
Multi-topology    
Military    
-55 to 125    
CDIP
CFP
LCCC    
See datasheet (CDIP)
See datasheet (CFP)
20LCCC: 79 mm2: 8.89 x 8.89(LCCC)    

Other qualified versions of UC1825

Version Part Number Definition
Catalog UC3825 TI's standard catalog product
Space UC1825-SP Radiation tolerant, ceramic packaging and qualified for use in Space-based application