UC2825 High Speed PWM Controller | TI.com

UC2825
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High Speed PWM Controller

High Speed PWM Controller - UC2825
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)

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)
UC2825 Order now Boost
Flyback
Forward
Full-Bridge
Half-Bridge
Push-Pull    
Current
Feedforward    
9.2     12     1000     9.2/8.4     80     1.5     Adjustable Switching Frequency
Current Limiting
Error Amplifier
Multi-topology
Programmable Max Duty Cycle
Soft Start
Synchronization Pin    
Catalog     -40 to 85     PDIP | 16
SOIC | 16    
16PDIP: 181 mm2: 9.4 x 19.3 (PDIP | 16)
16SOIC: 77 mm2: 7.5 x 10.3 (SOIC | 16)    
UC28025 Order now Boost
Flyback
Forward
Full-Bridge
Half-Bridge
Push-Pull    
Current
Feedforward
Voltage    
9.2     12     1000     9.2/8.4     45     1.5     Adjustable Switching Frequency
Current Limiting
Error Amplifier
Multi-topology
Programmable Max Duty Cycle
Soft Start
Synchronization Pin    
Catalog     -40 to 105     PDIP | 16
SOIC | 16    
16PDIP: 181 mm2: 9.4 x 19.3 (PDIP | 16)
16SOIC: 77 mm2: 7.5 x 10.3 (SOIC | 16)    
UC2825A Order now Boost
Flyback
Forward
Full-Bridge
Half-Bridge
Push-Pull    
Current
Voltage    
9.2     22     1000     9.2/8.4     50     2     Adjustable Switching Frequency
Current Limiting
Dead Time Control
Error Amplifier
Leading Edge Blanking
Multi-topology
Programmable Max Duty Cycle
Soft Start
Synchronization Pin    
Catalog     -40 to 85     PDIP | 16
SOIC | 16    
16PDIP: 181 mm2: 9.4 x 19.3 (PDIP | 16)
16SOIC: 77 mm2: 7.5 x 10.3 (SOIC | 16)    
UC2825B Samples not available Boost
Flyback
Forward
Full-Bridge
Half-Bridge
Push-Pull    
Current
Voltage    
16     22     1000     16/10     50     2     Adjustable Switching Frequency
Current Limiting
Dead Time Control
Error Amplifier
Leading Edge Blanking
Multi-topology
Programmable Max Duty Cycle
Soft Start
Synchronization Pin    
Catalog     -40 to 85     PDIP | 16
SOIC | 16    
16PDIP: 181 mm2: 9.4 x 19.3 (PDIP | 16)
16SOIC: 77 mm2: 7.5 x 10.3 (SOIC | 16)