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UCC3895DW / UCC3895 Phase-Shift PWM Controller IC — SOP-20, ZVS Full-Bridge (3-Pack)
UCC3895DW / UCC3895 Phase-Shift PWM Controller IC SOP-20, ZVS Full-Bridge (3-Pack)
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UCC3895DW / UCC3895 Phase-Shift PWM Controller IC — SOP-20, ZVS Full-Bridge (3-Pack)
The UCC3895DW / UCC3895 is a phase-shift PWM controller IC from Texas Instruments (formerly Unitrode), designed specifically for zero-voltage switching (ZVS) full-bridge DC-DC converter topologies. By controlling the phase shift between the two half-bridge legs, it achieves ZVS turn-on of all four power switches — eliminating switching losses and enabling high-efficiency operation at high frequencies. It is the standard controller IC for high-power telecom power supplies, server PSUs, and industrial DC-DC converters. This 3-pack is ideal for design engineers and repair technicians.
Key Electrical Specifications
| Parameter | Symbol | Value |
|---|---|---|
| Package | — | SOP-20 (SOIC-20) |
| Supply Voltage | VCC | 10V – 20V |
| Oscillator Frequency | fOSC | Up to 1MHz |
| Topology | — | Phase-shift ZVS full-bridge |
| Gate Drive Outputs | — | 4 (OUTA, OUTB, OUTC, OUTD) |
| Gate Drive Current | IOUT | ±1A peak |
| Soft-Start | — | Yes (programmable) |
| Dead-Time Control | — | Yes (adaptive) |
| Protections | — | OCP, UVLO, soft-start |
| Operating Temperature | Topr | -40°C to +85°C |
| Pack Quantity | — | 3 pieces |
UCC3895 vs UC3875 vs UCC28950 — ZVS Controller Comparison
| Feature | UCC3895 | UC3875 | UCC28950 |
|---|---|---|---|
| Topology | ZVS Full-Bridge | ZVS Full-Bridge | ZVS Full-Bridge + SR |
| Package | SOP-20 | DIP-20 / SOP-20 | SOP-24 |
| Sync Rectifier | ❌ No | ❌ No | ✅ Yes |
| Max Frequency | 1MHz | 1MHz | 1MHz |
| Best For | High-power SMPS, server PSU | Legacy designs | High-efficiency with SR |
Why Choose UCC3895?
- ✅ ZVS full-bridge control — eliminates switching losses for high-efficiency operation
- ✅ Up to 1MHz switching — compact magnetics and capacitors
- ✅ ±1A gate drive — directly drives power MOSFETs without external gate drivers
- ✅ Adaptive dead-time — optimizes ZVS across load range
- ✅ SOP-20 package — compact SMD footprint for modern PCB designs
- ✅ 3-pack value — design prototyping and repair stock
Typical Applications
- Telecom rectifier and power supply (48V output)
- Server and data center PSU (12V / 48V)
- Industrial DC-DC converter (high power)
- EV battery charger power stage
- Welding machine inverter controller
- High-frequency DC-DC converter design
Package Contents
- 3 × UCC3895DW / UCC3895 SOP-20 Phase-Shift PWM Controller IC
