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AC/DC & DC/DC controllers (external FET)

UC2856-Q1

AKTIV

PWM-Controller mit bis zu 1-MHz-Strommodus für die Automobil-Elektronik, 8 V bis 40 V

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Datenblatt

UC2856-Q1

AKTIV
Datenblatt Jetzt bestellen

Produktdetails

Vin (max) (V) 40 Operating temperature range (°C) -40 to 125 Control mode Current Topology Boost, Flyback, Forward, Full bridge, Half bridge, Push pull Rating Automotive Duty cycle (max) (%) 50
Vin (max) (V) 40 Operating temperature range (°C) -40 to 125 Control mode Current Topology Boost, Flyback, Forward, Full bridge, Half bridge, Push pull Rating Automotive Duty cycle (max) (%) 50
SOIC (DW) 16 106.09 mm² 10.3 x 10.3
  • Qualified for Automotive Applications
  • Pin-for-Pin Compatible With the UC2846
  • 65-ns Typical Delay From Shutdown to Outputs and
    50-ns Typical Delay From Sync to Outputs
  • Improved Current Sense Amplifier With Reduced Noise Sensitivity
  • Differential Current Sense With 3-V Common-Mode Range
  • Trimmed Oscillator Discharge Current for Accurate Deadband Control
  • Accurate 1-V Shutdown Threshold
  • High Current Dual Totem Pole Outputs (1.5-A Peak)
  • TTL Compatible Oscillator SYNC Pin Thresholds
  • ESD Protection
    • 4-kV Human-Body Model (HBM)
    • 500-V Charged-Device Model (CDM)
  • Qualified for Automotive Applications
  • Pin-for-Pin Compatible With the UC2846
  • 65-ns Typical Delay From Shutdown to Outputs and
    50-ns Typical Delay From Sync to Outputs
  • Improved Current Sense Amplifier With Reduced Noise Sensitivity
  • Differential Current Sense With 3-V Common-Mode Range
  • Trimmed Oscillator Discharge Current for Accurate Deadband Control
  • Accurate 1-V Shutdown Threshold
  • High Current Dual Totem Pole Outputs (1.5-A Peak)
  • TTL Compatible Oscillator SYNC Pin Thresholds
  • ESD Protection
    • 4-kV Human-Body Model (HBM)
    • 500-V Charged-Device Model (CDM)

The UC2856 is a high performance version of the popular UC2846 series of current mode controllers, and is intended for both design upgrades and new applications where speed and accuracy are important. All input to output delays have been minimized, and the current sense output is slew rate limited to reduce noise sensitivity. Fast 1.5-A peak output stages have been added to allow rapid switching of power FETs.

A low impedance TTL compatible sync output has been implemented with a 3-state function when used as a sync input.

Internal chip grounding has been improved to minimize internal noise caused when driving large capacitive loads. This, in conjunction with the improved differential current-sense amplifier, results in enhanced noise immunity.

Other features include a trimmed oscillator current (8%) for accurate frequency and dead-time control, a 1-V 5% shutdown threshold, and 4-kV minimum ESD protection (HBM) on all pins.

The UC2856 is a high performance version of the popular UC2846 series of current mode controllers, and is intended for both design upgrades and new applications where speed and accuracy are important. All input to output delays have been minimized, and the current sense output is slew rate limited to reduce noise sensitivity. Fast 1.5-A peak output stages have been added to allow rapid switching of power FETs.

A low impedance TTL compatible sync output has been implemented with a 3-state function when used as a sync input.

Internal chip grounding has been improved to minimize internal noise caused when driving large capacitive loads. This, in conjunction with the improved differential current-sense amplifier, results in enhanced noise immunity.

Other features include a trimmed oscillator current (8%) for accurate frequency and dead-time control, a 1-V 5% shutdown threshold, and 4-kV minimum ESD protection (HBM) on all pins.
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Technische Dokumentation

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* Data sheet Improved Current-Mode PWM Controller datasheet (Rev. B) 26 Mai 2011
Technical article Hybrid electric vehicles and electric vehicles need different isolated DC/DCs to w PDF | HTML 27 Dez 2017

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