UCC28250 Advanced PWM Controller with Pre-Bias Operation | TI.com

UCC28250 (ACTIVE)

Advanced PWM Controller with Pre-Bias Operation

 

Special note

New half-bridge controller

LM5036:

Integrates a fly-buck converter as auxiliary bias supply. Fully regulated pre-bias start-up. Enhanced CBC with high/low-side PWM pulse width matching function.

Description

The UCC28250 PWM controller is designed for high power density applications that may have stringent prebiased start-up requirements. The integrated synchronous rectifier control outputs target high-efficiency and high-performance topologies such as half-bridge, full-bridge, interleaved forward, and push-pull. The UCC27200 half-bridge drivers and UCC2732X MOSFET drivers used in conjunction with the UCC28250 provide a complete power converter solution.

Externally programmable soft-start, used in conjunction with an internal prebiased start-up circuit, allows the controller to gradually reach a steady-state operating point under all output conditions. The UCC28250 can be configured for primary or secondary-side control and either voltage or current mode control can be implemented.

The oscillator operates at frequencies up to 2 MHz, and can be synchronized to an external clock. Input voltage feedforward, cycle-by-cycle current limit, and a programmable hiccup timer allow the system to stay within a safe operation range. Input voltage, output voltage and temperature protection can be implemented. Dead time between primary-side switch and secondary-side synchronous rectifiers can be independently programmed.

Features

  • Prebiased Start-up
  • Synchronous Rectifier Control Outputs With Programmable Delays (Including Zero Delay Support)
  • Voltage Mode Control With Input Voltage Feed-Forward or Current Mode Control
  • Primary or Secondary-Side Control
  • 3.3-V, 1.5% Accurate Reference Output
  • 1-MHz Capable Switching Frequency
  • 1% Accurate Cycle-by-Cycle Overcurrent Protection with Matched Duty Cycle Outputs
  • Programmable Soft-Start and Hiccup Restart Timer
  • Thermally Enhanced 4-mm × 4-mm QFN-20 Package and 20-pin TSSOP Package

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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)
UCC28250 Order now Forward
Full-Bridge
Half-Bridge
Push-Pull    
Current
Voltage    
4.7     17     1000     4.3/4.1     100     0.2     Current Limiting
HV Start-up
SR Logic    
Catalog     -40 to 125     QFN | 20
TSSOP | 20    
20QFN: 16 mm2: 4 x 4 (QFN | 20)
20TSSOP: 42 mm2: 6.4 x 6.5 (TSSOP | 20)    
LM5035B Order now Half-Bridge     Feedforward
Voltage    
8     15     2000     Programmable/1.25V     50     2     Current Limiting
HV Start-up
Multi-topology
Pre-Bias Start-Up
Synchronization Pin    
Catalog     -40 to 125     HTSSOP | 20
WQFN | 24    
20HTSSOP: 42 mm2: 6.4 x 6.5 (HTSSOP | 20)
24WQFN: 20 mm2: 4 x 5 (WQFN | 24)    
LM5035C Order now Half-Bridge
Push-Pull    
Feedforward
Voltage    
8     15     2000     Programmable/1.25V     50     2     Current Limiting
HV Start-up
Multi-topology
Pre-Bias Start-Up
Synchronization Pin    
Catalog     -40 to 125     HTSSOP | 20
WQFN | 24    
20HTSSOP: 42 mm2: 6.4 x 6.5 (HTSSOP | 20)
24WQFN: 20 mm2: 4 x 5 (WQFN | 24)    
LM5036 Order now Full-Bridge
Half-Bridge
Push-Pull    
Feedforward
Voltage    
    2000     Programmable/1.25V     50     2     Current Limiting
Frequency Synchronization
HV Start-up
Input Line Monitor
Integrated Switch
Leading Edge Blanking
Multi-topology
Pre-Bias Start-Up
Soft Start
Synchronization Pin
Thermal Shutdown
Wide DC input    
Catalog     -40 to 125     WQFN | 28     28WQFN: 25 mm2: 5 x 5 (WQFN | 28)    
LM5039 Order now Full-Bridge
Half-Bridge
Push-Pull    
Voltage     8     15     2000     Programmable/1.25V     50     2     Current Limiting
HV Start-up
Multi-topology
Synchronization Pin    
Catalog     -40 to 125     HTSSOP | 20
WQFN | 24    
20HTSSOP: 42 mm2: 6.4 x 6.5 (HTSSOP | 20)
24WQFN: 20 mm2: 4 x 5 (WQFN | 24)    
UCC28251 Order now Forward
Full-Bridge
Half-Bridge
Push-Pull    
Current
Feedforward
Voltage    
4.7     17     1000     4.3/4.1     100     0.2     Current Limiting
Leading Edge Blanking
Multi-topology
Pre-Bias Start-Up
Programmable Slope Compensation
SR Logic
Soft Start
Synchronization Pin    
Catalog     -40 to 125     QFN | 20
TSSOP | 20    
20QFN: 16 mm2: 4 x 4 (QFN | 20)
20TSSOP: 42 mm2: 6.4 x 6.5 (TSSOP | 20)