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