UC2875

ACTIVE

Bipolar phase shifted full bridge controller with 10.75V/9.25V UVLO, -25°C to 85°C

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Product details

Parameters

Topology Phase-Shifted Full-Bridge Control method Current, Feedforward, Voltage VCC (Min) (V) 10.75 VCC (Max) (V) 20 Duty cycle (Max) (%) 100 UVLO thresholds on/off (V) 10.75/9.25 Frequency (Max) (kHz) 1000 Operating temperature range (C) -25 to 85 Gate drive (Typ) (A) 2 Features Adjustable Switching Frequency, Error Amplifier, Multi-topology, Soft Start, Soft Switching, Synchronization Pin Rating Catalog open-in-new Find other PWM controllers & resonant controllers

Package | Pins | Size

PDIP (N) 20 229 mm² 24.33 x 9.4 SOIC (DW) 28 184 mm² 17.9 x 10.3 open-in-new Find other PWM controllers & resonant controllers

Features

  • Zero to 100% Duty Cycle Control
  • Programmable Output Turn-On Delay
  • Compatible with Voltage or Current Mode Topologies
  • Practical Operation at Switching Frequencies to 1MHz
  • Four 2A Totem Pole Outputs
  • 10MHz Error Amplifier
  • Undervoltage Lockout
  • Low Startup Current—150µA
  • Outputs Active Low During UVLO
  • Soft-Start Control
  • Latched Over-Current Comparator With Full Cycle Restart
  • Trimmed Reference
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Description

The UC1875 family of integrated circuits implements control of a bridge power stage by phase-shifting the switching of one half-bridge with respect to the other, allowing constant frequency pulse-width modulation in combination with resonant, zero-voltage switching for high efficiency performance at high frequencies. This family of circuits may be configured to provide control in either voltage or current mode operation, with a separate over-current shutdown for fast fault protection.

A programmable time delay is provided to insert a dead-time at the turn-on of each output stage. This delay, providing time to allow the resonant switching action, is independently controllable for each output pair (A-B, C-D).

With the oscillator capable of operation at frequencies in excess of 2MHz, overall switching frequencies to 1MHz are practical. In addition to the standard free running mode, with the CLOCKSYNC pin, the user may configure these devices to accept an external clock synchronization signal, or may lock together up to 5 units with the operational frequency determined by the fastest device.

Protective features include an undervoltage lockout which maintains all outputs in an active-low state until the supply reaches a 10.75V threshold. 1.5V hysteresis is built in for reliable, boot-strapped chip supply. Over-current protection is provided, and will latch the outputs in the OFF state within 70nsec of a fault. The current-fault circuitry implements full-cycle restart operation.

Additional features include an error amplifier with band-width in excess of 7MHz, a 5V reference, provisions for soft-starting, and flexible ramp generation and slope compensation circuitry.

These devices are available in 20-pin DIP, 28-pin "bat-wing" SOIC and 28 lead power PLCC plastic packages for operation over both 0°C to 70°C and –25°C to +85°C temperature ranges; and in hermetically sealed cerdip, and surface mount packages for –55°C to +125°C operation.

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Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 5
Type Title Date
* Datasheet Phase Shift Resonant Controller datasheet (Rev. C) May 24, 2007
Application note Phase Shifted Full Bridge, Zero Voltage Transition Design Considerations (Rev. A) Jan. 22, 2011
More literature Seminar 800 Topic 5 - Fixed-Frequency Resonant-Switched PWM Feb. 15, 2001
More literature Seminar 900 Topic 3 - Designing a Phase-Shifted ZVT Power Converter Feb. 15, 2001
More literature Seminar 900 Topic 4 - 500-W 40-W/in3 Phase-Shifted ZVT Power Converter Feb. 15, 2001

Design & development

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Hardware development

EVALUATION BOARD Download
UCC3895 Evaluation Module
UCC3895EVM-001
149
Description

The UCC3895EVM-001 is an isolated 48V input phase shifted full bridge converter providing an output of 3.3V at 15A. Using the AB outputs of the UCC3895, a novel technique for direct control driven synchronous rectification is demonstrated.

Features

Uses the A and B outputs of the UCC3895 along with a UCC37324 dual 4A MOSFET driver to implement direct control of a synchronous rectifier current doubler in a phase shifted full bridge topology. This technique provides the proper gating and timing signals necessary to accurately synchronize output (...)

CAD/CAE symbols

Package Pins Download
PDIP (N) 20 View options
SOIC (DW) 28 View options

Ordering & quality

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