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UCC38501
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UCC38501

  • 所属类别：ACDC-和-DCDC-电源
  • 产品名称：BiCMOS PFC/PWM 组合控制器
  • 厂商：TI
  • 生产批号：10+
  • 封装：20PDIP, 20SOIC
  • 库存状态：有库存
  • 库存量：6000
  • 最低订购量：1
  • 详细资料：点击查找UCC38501的pdf资料
  • 点击询价
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  • Product Introduction

The UCC2850x home provides all the control functions needed for a power factor correction preconditioner and an active second-stage DC-DC converter. The controller realizes that by shaping the AC input current waveform, it corresponds to the AC input line voltage, and uses the average current mode to control the power factor close to 1. The DC-DC converter uses a peak current control mode to perform step-down power conversion.

The PFC stage is advanced modulation, while the second stage is the minimum allowable synchronization increase of the trailing edge between overlap and PWM switching. This reduces the number of capacitors. In order ripple current large capacity output operation more than three to one) input line voltage, line feedforward (five FF is used to maintain a constant input supply voltage change.

characteristic
 
  • Combined PFC and downstream converter control
  • Controls the boost pre-regulator to the near power factor
  • Precise power limits
  • Improved feedforward line adjustment
  • The peak current mode is controlled in the second stage
  • Programmable oscillator
  • Leading-Edge/Trailing-Edge modulation reduces output ripple
  • Low starting current
  • The second stage begins synchronous action with programmable soft start
  • The second stage is programmable shutdown
parameter
  UCC38501
On/off of undervoltage lockout threshold (5) 10.5/10
Working power supply (max) (five) 18
Starting Current (mA) 0.15
Operating Supply Current (mA) 4
Vref (V) 7.5
Vref's Thor (%) 1.5
Duty Cycle (Max) (%) 100
Actual operating frequency (max) (MHz) 0.2
Pin/Pack 20PDIP，20SOIC

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