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.
| Tipo | Título | Fecha | ||
|---|---|---|---|---|
| * | Data sheet | Phase Shift Resonant Controller datasheet (Rev. C) | 24 may 2007 | |
| Selection guide | Power Management Guide 2018 (Rev. R) | 25 jun 2018 | ||
| Application note | Phase Shifted Full Bridge, Zero Voltage Transition Design Considerations (Rev. A) | 22 ene 2011 | ||
| Application note | Current Doubler Rectifier Offers Ripple Current Cancellation | 21 sep 2004 | ||
| Application note | Synchronous Rectifiers of a Current Doubler | 27 feb 2003 | ||
| Application note | A Comparison Between the BiCMOS UCC3895 Phase Shift Controller and the UC3875 | 22 feb 2001 | ||
| More literature | Seminar 800 Topic 5 - Fixed-Frequency Resonant-Switched PWM | 15 feb 2001 | ||
| More literature | Seminar 900 Topic 3 - Designing a Phase-Shifted ZVT Power Converter | 15 feb 2001 | ||
| More literature | Seminar 900 Topic 4 - 500-W 40-W/in3 Phase-Shifted ZVT Power Converter | 15 feb 2001 | ||
| Application note | DN-63 The Current-Doubler Rectifier: An Alternative Rectification Technique | 12 ene 2001 |
Para conocer los términos adicionales o los recursos necesarios, haga clic en cualquier título de abajo para ver la página de detalles cuando esté disponible.
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.
| Paquete | Pasadores | Descargar |
|---|---|---|
| PDIP (N) | 20 | Ver opciones |
| SOIC (DW) | 28 | Ver opciones |
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