UC3875DWP Texas Instruments power-management (SOIC) In Stock
UC3875DWP is a Texas Instruments phase-shifted full-bridge PWM controller in 20-SOIC package, supporting up to 1 MHz switching, programmable dead-time, and zero-voltage switching. Price from $7.26. In stock, inquiry welcome, ships worldwide.
- Manufacturer
- Texas Instruments
- Package
- SOIC
- Pin Count
- 20
- Lifecycle
- ACTIVE
- Datasheet
- UC3875DWP Datasheet PDF
- Category
- power-management
- Price
- From $7.2600(MOQ 8)
- Temp Range
- 0.0°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Phase-shifted full-bridge PWM control topology for zero-voltage switching (ZVS)
- Switching frequency up to 1 MHz for compact magnetics design
- Programmable dead-time control via resistor for precise ZVS operation
- Dual output drive capable of sourcing/sinking 1 A peak current
- Built-in adaptive dead-time management and cycle-by-cycle current limiting
- Wide supply voltage range: 10 V to 20 V VCC
- 20-pin SOIC package for easy PCB integration
Applications
UC3875DWP is designed for telecom and server power supplies, high-density DC-DC converters, and industrial SMPS systems requiring high efficiency. Its zero-voltage switching capability makes it ideal for isolated full-bridge topologies in 100 W–5 kW power conversion designs.
Specifications
| Supply Voltage (VCC) | 10–20V |
| Switching Frequency | up to 1000kHz |
| Output Drive Current (Peak) | 1A |
| Operating Temperature Range | 0 to +70°C |
| Package | 20-SOIC |
| Pin Count | 20 |
| Control Topology | Phase-Shifted Full-Bridge PWM |
| Dead-Time Control | Programmable (resistor-set) |
| Package | SOIC |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | No |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for UC3875DWP:
Direct functional upgrade with added soft-start, enhanced protection features, and same 20-SOIC package. Pin-compatible drop-in replacement recommended for new designs.
Phase-shift full-bridge PWM controller in same 20-SOIC package from TI; similar control architecture with comparable dead-time management.
Frequently Asked Questions
How does the UC3875DWP achieve zero-voltage switching?
The UC3875DWP uses a phase-shift control scheme to manage the timing between the leading-leg and lagging-leg switch pairs. Programmable dead-time (set via external resistor) allows transformer leakage inductance to resonantly charge/discharge MOSFET capacitances before turn-on, achieving ZVS and reducing switching losses.
Can UC3875DWP drive MOSFETs directly, and what gate drive current can it supply?
Yes. Each output pin can source and sink up to 1 A peak current, making it suitable for driving external MOSFETs directly in a full-bridge configuration. For higher gate capacitance devices, a gate driver buffer stage (e.g., UCC27524) is recommended.
What is the maximum switching frequency of the UC3875DWP?
The UC3875DWP oscillator supports switching frequencies up to 1 MHz, set by an external RC network. Higher frequencies allow smaller transformer and filter designs but increase gate drive losses; typical designs operate at 100–500 kHz.
Which applications is UC3875DWP best suited for?
The UC3875DWP targets high-efficiency isolated DC-DC converters used in telecom rectifiers, server power supplies, industrial UPS systems, and battery chargers in the 100 W–5 kW power range. Its phase-shift topology reduces EMI and switching stress compared to hard-switched converters.
Are there pin-compatible or functionally equivalent alternatives to UC3875DWP?
Functional alternatives include the UCC3895DW (TI, improved version with soft-start and enhanced protection), UC3879DW (TI, phase-shift variant), and LM5046 (TI, enhanced phase-shift controller). For non-pin-compatible replacements, the UCC28950 offers advanced control with more protection features.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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