| Topology | Phase-Shifted Full-Bridge |
| Duty cycle (Max) (%) | 100 |
| Vin (Max) (V) | 29 |
| UVLO thresholds on/off (V) | 10.75/9 |
| Features | Adjustable Switching Frequency, Current Limiting, Error Amplifier, Soft Start, Soft Switching, Synchronization Pin |
| Operating temperature range (C) | -40 to 85 |
| Switching frequency (Max) (kHz) | 300 |
| Rating | Catalog, Military |
| Gate drive (Typ) (A) | 0.1 |
- Programmable Output Turn On Delay; Zero Delay Available
- Compatible with Voltage Mode or Current Mode Topologies
- Practical Operation at Switching Frequencies to 300 kHz
- 10-MHz Error Amplifier
- Pin Programmable Undervoltage Lockout
- Low Startup Current — 150 μA
- Soft Start Control
- Outputs Active Low During UVLO
The UC3879 controls a bridge power stage by phase shifting the switching of one half-bridge with respect to the other. This allows constant frequency pulse width modulation in combination with resonant, zero-voltage switching for high efficiency performance. The UC3879 can be configured to provide control in either voltage mode or current mode operation, with overcurrent shutdown for fast fault protection.
Independently programmable time delays provide dead-time at the turn-on of each output stage, allowing time for each resonant switching interval.
With the oscillator capable of operating in excess of 600 kHz, overall output switching frequencies to 300 kHz are practical. In addition to the standard free running mode, with the CLKSYNC pin, the user may configure the UC3879 to accept an external clock synchronization signal. Alternatively, up to three units can be locked together with the operational frequency determined by the fastest device.
Protective features include an undervoltage lockout and overcurrent protection. Additional features include a 10-MHz error amplifier, a 5-V precision reference, and soft start. The UC3879 is available in 20 pin N, J, DW, and Q and 28 pin L packages.
