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UC3856

Features: • Pin-for-Pin Compatible With the UC3846• 65ns Typical Delay From Shutdown to Outputs, and 50ns Typical Delay From Sync to Outputs• Improved Current Sense Amplifier With Reduced Noise Sensitivity• Differential Current Sense with 3V Common Mode Range• Trimmed...

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SeekIC No. : 004535650 Detail

UC3856: Features: • Pin-for-Pin Compatible With the UC3846• 65ns Typical Delay From Shutdown to Outputs, and 50ns Typical Delay From Sync to Outputs• Improved Current Sense Amplifier With ...

UC3856 Data Sheet

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Part Number:
UC3856
Supply Ability:
5000

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  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



Features:

• Pin-for-Pin Compatible With the UC3846
• 65ns Typical Delay From Shutdown to
  Outputs, and 50ns Typical Delay From Sync to Outputs
• Improved Current Sense Amplifier With
  Reduced Noise Sensitivity
• Differential Current Sense with 3V
  Common Mode Range
• Trimmed Oscillator Discharge Current
  for Accurate Deadband Control
• Accurate 1V Shutdown Threshold
• High Current Dual Totem Pole Outputs (1.5A peak)
• TTL Compatible Oscillator SYNC Pin Thresholds
• 4kV ESD Protection


Pinout

Connection Diagram


Specifications

Supply Voltage ....................................................................+40V
Collector Supply Voltage .....................................................+40V
Output Current, Source or Sink
DC.........................................................................................0.5A
Pulse (0.5ms)........................................................................2.0A
Error Amp Inputs....................................................-0.3V to +VIN
Shutdown Input.....................................................-0.3V to +10V
Current Sense Inputs..............................................-0.3V to +3V
SYNC Output Current .......................................................±10mA
Error Amplifier Output Current ............................................-5mA
Soft Start Sink Current........................................................50mA
Oscillator Charging Current ..................................................5mA
Power Dissipation at TA = 25°C (Note 2).......................1000mW
Power Dissipation at TC = 25°C (Note 2) ......................2000mW
Junction Temperature .......................................-55°C to +150°C
Storage Temperature Range ............................-65°C to +150°C
Lead Temperature (Soldering, 10 sec.) ...........................+300°C
All voltages are with respect to Ground. Currents are positive
into, negative out of the specified terminal. Consult packaging
section of databook for thermal limitations and considerations of
package.


Description

The UC3856 is a high performance version of the popular UC3846 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 1.5A peak output stages of UC3856 have been added to allow rapid switching of power FETs.

A low impedance TTL compatible sync output of UC3856 has been implemented with a tri-state function when used as a sync input.

Internal chip grounding of UC3856 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 of UC3856 include a trimmed oscillator current (8%) for accurate frequency and dead time control; a 1V, 5% shutdown threshold; and 4kV minimum ESD protection on all pins.




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