UC3879

現行

具有可選 UVLO、0°C 至 70°C 的增強型雙極全橋相移式控制器，

立即訂購

產品規格表

document-pdfAcrobat Phase Shift Resonant Controller datasheet (Rev. B) (英文)

UC3879

現行

產品規格表

立即訂購

產品詳細資料

Vin (max) (V)

20

Operating temperature range (°C)

0 to 70

Control mode

Current, Feedforward, Voltage

Topology

Boost, Buck, Full bridge

Rating

Catalog

Features

Adjustable switching frequency, Current limiting, Error amplifier, Soft start, Soft switching, Synchronization pin

Vin (max) (V)

20

Operating temperature range (°C)

0 to 70

Control mode

Current, Feedforward, Voltage

Topology

Boost, Buck, Full bridge

Rating

Catalog

Features

Adjustable switching frequency, Current limiting, Error amplifier, Soft start, Soft switching, Synchronization pin

PDIP (N)

20

228.702 mm² 24.33 x 9.4

SOIC (DW)

20

131.84 mm² 12.8 x 10.3

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

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.

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.

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