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UC3856
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UC3856

  • Category:ACDC- and -DCDC-power supply
  • Product Name:Improved current mode PWM controller
  • Manufacturers:TI
  • Production Batch Number:08+
  • Encapsulation:16PDIP, 16SOIC, 20PLCC
  • Stock Status:There is stock
  • Stock Quantity:2000
  • Minimum order quantity: 1
  • Details:Click here to find PDF information on UC3856
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  • Product introduction

The UC3856 is a high-performance version of the popular UC3846 current mode controller series and is important for designing upgrades for new applications and intends to do so in speed and accuracy. All input and output delays are minimized and the current sense output slew rate is limited to reduce noise susceptibility. A fast 1.5A peak output stage has been added to allow fast switching of the power FETs.

The low-impedance TTL-compatible synchronous output acts as a synchronous input when the three-state function is implemented.

The grounding of the internal chip has been improved to reduce the large capacitive loads caused by the internal x93noise \ driving x94. This is combined with an improved differential current-sense amplifier to enhance noise immunity.

characteristic
 
  • Pin to pin compatible with UC3846
  • A typical shutdown delay of 65ns to the output and a typical delay of 50ns to output synchronization
  • Improved, reduced noise sensitivity current sense amplifier
  • The differential current sense has a common-mode range of 3V
  • Precise dead band control of edge vibration discharge current
  • Accurate 1V closing threshold
  • High current dual totem pole output (1.5A peak)
  • TTL-compatible threshold for the oscillator sync pin
  • 4kV ESD protection
parameter
      UC3856
topology     Boost, buck, reverse, forward, full bridge, half bridge, push and pull
Control method     Current mode
Duty cycle (max.) (%)     50
Frequency (max) (khertz)     1000
On/Off of Undervoltage Lockout Threshold (5)     7.7 / 7
Pins/Packets     16PDIP，16SOIC，20PLCC
(#) Regulated output     2
Operating temperature range(°C)     0 to 70

andUC3856Related ICs are:


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LP3856ES-ADJ/NOPB   10+11+   Hong Kong spot, imported original
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LP3856ESX-ADJ NS 08+ TO-263-5 Brand new original
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