UCC2891DR
Active110-V ACTIVE CLAMP CURRENT MODE PWM CONTROLLER WITH P-CHANNEL CLAMP FET AND 0.75V CS THRESHOLD
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UCC2891DR
Active110-V ACTIVE CLAMP CURRENT MODE PWM CONTROLLER WITH P-CHANNEL CLAMP FET AND 0.75V CS THRESHOLD
Technical Specifications
Parameters and characteristics for this part
| Specification | UCC2891DR |
|---|---|
| Clock Sync | True |
| Control Features | Ramp, Soft Start, On Time Control, Enable, Current Limit |
| Duty Cycle (Max) [Max] | 70 % |
| Frequency - Switching | 250 kHz |
| Function | Step-Up/Step-Down |
| Mounting Type | Surface Mount |
| Number of Outputs | 1 |
| Operating Temperature [Max] | 85 °C |
| Operating Temperature [Min] | -40 °C |
| Output Configuration | Positive, Isolation Capable |
| Output Phases | 1 |
| Output Type | Transistor Driver |
| Package / Case | 16-SOIC |
| Package / Case [x] | 0.154 in |
| Package / Case [y] | 3.9 mm |
| Supplier Device Package | 16-SOIC |
| Synchronous Rectifier | False |
| Topology | Forward Converter, Flyback |
| Voltage - Supply (Vcc/Vdd) [Max] | 16 V |
| Voltage - Supply (Vcc/Vdd) [Min] | 8.5 V |
UCC2891 Series
110-V active clamp current mode PWM controller with P-channel clamp FET and 0.75V CS threshold
| Part | Topology | Voltage - Supply (Vcc/Vdd) [Min] | Voltage - Supply (Vcc/Vdd) [Max] | Mounting Type | Synchronous Rectifier | Output Configuration | Duty Cycle (Max) [Max] | Supplier Device Package | Function | Clock Sync | Output Type | Control Features | Operating Temperature [Max] | Operating Temperature [Min] | Output Phases | Number of Outputs | Frequency - Switching | Package / Case | Package / Case [x] | Package / Case [y] | Voltage - Output | Current - Output | Main Purpose | Supplied Contents | Voltage - Input [Max] | Voltage - Input [Min] | Utilized IC / Part | Outputs and Type | Outputs and Type | Board Type | Regulator Topology |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Texas Instruments | Flyback Forward Converter | 8.5 V | 16 V | Surface Mount | Isolation Capable Positive | 70 % | 16-SOIC | Step-Up/Step-Down | Transistor Driver | Current Limit Enable On Time Control Ramp Soft Start | 85 °C | -40 °C | 1 | 1 | 250 kHz | 16-SOIC | 0.154 in | 3.9 mm | |||||||||||||
Texas Instruments | Flyback Forward Converter | 8.5 V | 16 V | Surface Mount | Isolation Capable Positive | 70 % | 16-TSSOP | Step-Up/Step-Down | Transistor Driver | Current Limit Enable On Time Control Ramp Soft Start | 85 °C | -40 °C | 1 | 1 | 250 kHz | 16-TSSOP | 0.173 in | 4.4 mm | |||||||||||||
Texas Instruments | Flyback Forward Converter | 8.5 V | 16 V | Surface Mount | Isolation Capable Positive | 70 % | 16-SOIC | Step-Up/Step-Down | Transistor Driver | Current Limit Enable On Time Control Ramp Soft Start | 85 °C | -40 °C | 1 | 1 | 250 kHz | 16-SOIC | 0.154 in | 3.9 mm | |||||||||||||
Texas Instruments | 250 kHz | 3.3 V | 30 A | DC/DC Step Down | Board(s) | 75 V | 36 V | UCC2891 | Non-Isolated | 1 | Fully Populated | Forward Converter | |||||||||||||||||||
Texas Instruments | Flyback Forward Converter | 8.5 V | 16 V | Surface Mount | Isolation Capable Positive | 70 % | 16-TSSOP | Step-Up/Step-Down | Transistor Driver | Current Limit Enable On Time Control Ramp Soft Start | 85 °C | -40 °C | 1 | 1 | 250 kHz | 16-TSSOP | 0.173 in | 4.4 mm | |||||||||||||
Texas Instruments | Flyback Forward Converter | 8.5 V | 16 V | Surface Mount | Isolation Capable Positive | 70 % | 16-SOIC | Step-Up/Step-Down | Transistor Driver | Current Limit Enable On Time Control Ramp Soft Start | 85 °C | -40 °C | 1 | 1 | 250 kHz | 16-SOIC | 0.154 in | 3.9 mm |
Pricing
Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly
| Distributor | Package | Quantity | $ | |
|---|---|---|---|---|
| Digikey | Cut Tape (CT) | 1 | $ 2.72 | |
| 10 | $ 2.44 | |||
| 25 | $ 2.31 | |||
| 100 | $ 2.00 | |||
| 250 | $ 1.90 | |||
| 500 | $ 1.70 | |||
| 1000 | $ 1.44 | |||
| Digi-Reel® | 1 | $ 2.72 | ||
| 10 | $ 2.44 | |||
| 25 | $ 2.31 | |||
| 100 | $ 2.00 | |||
| 250 | $ 1.90 | |||
| 500 | $ 1.70 | |||
| 1000 | $ 1.44 | |||
| Tape & Reel (TR) | 2500 | $ 1.36 | ||
| 5000 | $ 1.31 | |||
| Texas Instruments | LARGE T&R | 1 | $ 2.05 | |
| 100 | $ 1.80 | |||
| 250 | $ 1.26 | |||
| 1000 | $ 1.02 | |||
Description
General part information
UCC2891 Series
The UCC2891/2/3/4 family of PWM controllers is designed to simplify implementation of the various active clamp/reset switching power topologies.
The UCC289x is a peak current-mode, fixedfrequency, high-performance pulse width modulator. It includes the logic and the drive capability for the auxiliary switch with a simple method of programming the critical delays for proper active clamp operation.
The UCC2891/3 includes a 110-V start-up regulator for initial start-up and to provide keep-alive power during stand-by.
Documents
Technical documentation and resources