UC2856Q

ACTIVE

40V, 1.5A current mode 1MHz PWM controller , -40C to 125C

Product details

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
  • 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
  • 4-kV ESD Protection

  • 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
  • 4-kV ESD Protection

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 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 on all pins.

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* Data sheet UC2856Q: Improved Current Mode PWM Controller datasheet (Rev. A) 26 May 2011

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