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UC3879

新規設計での使用を推奨しません

エンハンスド、選択可能な UVLO 搭載、0℃ ～ 70℃、バイポーラ、位相シフト フルブリッジ コントローラ

ご注文はこちら
データシート
UC3879 は新規設計での使用を推奨しません
これまでにご購入されたお客様をサポートする目的でこの製品を引き続き生産しています。新規設計では代替品をご検討ください。
open-in-new 代替品と比較
比較対象デバイスと類似の機能。
UCC28951 アクティブ SR (同期整流器) 制御機能搭載、広い入力電圧範囲向け、グリーン、位相シフト フルブリッジ コントローラ More programmable features, integrated SR control with a wider operating range and duty cycle

UC3879

新規設計での使用を推奨しません
データシート ご注文はこちら

製品詳細

Topology Boost, Buck, Full bridge Control mode Current, Feedforward, Voltage Features Adjustable switching frequency, Current limiting, Error amplifier, Soft start, Soft switching, Synchronization pin
Topology Boost, Buck, Full bridge Control mode Current, Feedforward, Voltage Features Adjustable switching frequency, Current limiting, Error amplifier, Soft start, Soft switching, Synchronization pin
SOIC (DW) 20 131.84 mm² (12.8 mm × 10.3 mm) PDIP (N) 20 228.702 mm² (24.33 mm × 9.4 mm)
  • 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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上位の文書 タイプ タイトル フォーマットオプション 最新の英語版をダウンロード 日付
* データシート Phase Shift Resonant Controller データシート (Rev. B) 2006/12/13

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