UC28025 Economy High Speed PWM Controllers (Double-ended) | TI.com

UC28025
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Economy High Speed PWM Controllers (Double-ended)

 

Description

The UC28023 and UC28025 are fixed-frequency PWM controllers optimized for high-frequency switched-mode power-supply applications. The UC28023 is a single output PWM for single-ended topologies while the UC28025 offers dual alternating outputs for double-ended and full bridge topologies.

Targeted for cost-effective solutions with minimal external components. UC2802x devices include an oscillator, a temperature compensated reference, a wide bandwidth error amplifier, a high-speed current-sense comparator, and high-current, active-high, totem-pole outputs to directly drive external MOSFETs.

Protection circuitry includes a current limit comparator with a 1-V threshold, a TTL compatible shutdown port, and a soft-start pin which doubles as a maximum duty-cycle clamp. The logic is fully latched to provide jitter-free operation and prohibit multiple pulses at an output. An undervoltage lockout section with 800 mV of hysteresis assures low start-up current. During undervoltage lockout, the outputs are high impedance. Propagation delays through the comparators and logic circuitry have been minimized while maximizing bandwidth and slew rate of the error amplifier.

Devices are available in the industrial temperature range of –40°C to 105°C. Package offerings are 16-pin SOIC (DW), or 16-pin PDIP (N) packages.

Features

  • Peak Current Mode, Average Current Mode, or Voltage Mode (With FeedForward) Control Methods
  • Practical Operation Up to 1 MHz
  • 50-ns Propagation Delay to Output
  • ±1.5-A Peak Totem Pole Outputs
  • 9-V to 30-V Nominal Operational Voltage
  • Wide Bandwidth Error Amplifier
  • Fully Latched Logic With Double Pulse Suppression
  • Pulse-by-Pulse Current Limiting
  • Programmable Maximum Duty Cycle Control
  • Undervoltage Lockout With Hysteresis
  • Trimmed 5.1-V Reference With UVLO
  • Same Functionality as UC3823 and UC3825

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)
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)    
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)    
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)