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UCC38503的基本参数
  • 制造厂商:TI
  • 产品类别:电源管理
  • 技术类目:交流/直流和隔离式直流/直流开关稳压器 - 功率因数校正 (PFC) 控制器
  • 功能描述:具有 10.5V/10V VCC UVLO 和 6.75V/3.75V PWM UVLO、温度范围为 0°C 至 70°C 的 PFC/PWM 组合控制器
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UCC38503的产品详情:

The UCC2850x family provides all of the control functions necessary for an active power-factor-corrected preregulator and a second-stage dc-to-dc converter. The controller achieves near-unity power factor by shaping the ac input line current waveform to correspond to the ac input-line voltage using average current-mode control. The dc-to-dc converter uses peak current-mode control to perform the step-down power conversion.

The PFC stage is leading-edge modulated while the second stage is trailing-edge synchronized to allow for minimum overlap between the boost and PWM switches. This reduces ripple current in the bulk-output capacitor.In order to operate with over three-to-one range of input-line voltages, a line feedforward (VFF) is used to keep input power constant with varying input voltage. Generation of VFF is accomplished using IAC in conjunction with an external single-pole filter. This not only reduces external parts count, but also avoids the use of high-voltage components, offering a lower-cost solution. The multiplier then divides the line current by the square of VFF.

The UCC2850x PFC section incorporates a low offset-voltage amplifier with 7.5-V reference, a highly-linear multiplier capable of a wide current range, a high-bandwidth, low offset-current amplifier, with a novel noise-attenuation configuration, PWM comparator and latch, and a high-current output driver. Additional PFC features include over-voltage protection, zero-power detection to turn off the output when VAOUT is below 0.33 V and peak current and power limiting.

The dc-to-dc section relies on an error signal generated on the secondary-side and processes it by performing peak current mode control. The dc-to-dc section also features current limiting, a controlled soft-start, preset operating range with selectable options, and 50% maximum duty cycle.

The UCC28500 and UCC28502 have a wide PFC-UVLO threshold (16.5 V/10 V) for bootstrap bias supply operation. The UCC28501 and UCC28503 are designed with a narrow UVLO range (10.5 V/10 V) more suitable for fixed bias operation. The UCC28500 and UCC28501 have a narrow UVLO threshold for PWM stage (to allow operation down to 75% of nominal bulk voltage), while the UCC28502 and UCC38503 are configured for a much wider operation range for the PWM stage (down to 50% of bulk nominal voltage).

Available in 20-pin N and DW packages.

UCC38503的优势和特性:
  • Combines PFC and Downstream Converter Controls
  • Controls Boost Preregulator to Near-Unity Power Factor
  • Accurate Power Limiting
  • Improved Feedforward Line Regulation
  • Peak Current-Mode Control in Second Stage
  • Programmable Oscillator
  • Leading-Edge/Trailing-Edge Modulation for Reduced Output Ripple
  • Low Start-up Supply Current
  • Synchronized Second Stage Start-Up, with Programmable Soft-start
  • Programmable Second Stage Shutdown

UCC38503的参数(英文):
  • Topology
  • Boost
  • Control mode
  • CCM
  • Practical operating frequency (Max) (MHz)
  • 0.2
  • UVLO thresholds on/off (V)
  • 10.5/10
  • Device type
  • Controllers
  • Operating supply current (mA)
  • 4
  • Features
  • < 150W Applications, Average Current Mode, Continuous Control Mode , Enable, OVP
  • Rating
  • Catalog
  • Operating temperature range (C)
  • 0 to 70
UCC38503具体的完整产品型号参数及价格(美元):

UCC38503的完整型号有:UCC38503DW、UCC38503DWTR,以下是这些产品的关键参数及官网采购报价:

UCC38503DW,工作温度:0 to 70,封装:SOIC (DW)-20,包装数量MPQ:25个,MSL 等级/回流焊峰值温度:Level-2-260C-1 YEAR,引脚镀层/焊球材料:NIPDAU,TI官网UCC38503DW的批量USD价格:2.73(1000+)

UCC38503DWTR,工作温度:0 to 70,封装:SOIC (DW)-20,包装数量MPQ:2000个,MSL 等级/回流焊峰值温度:Level-2-260C-1 YEAR,引脚镀层/焊球材料:NIPDAU,TI官网UCC38503DWTR的批量USD价格:2.275(1000+)

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UCC38503的评估套件:

UCC38503DW,工作温度:0 to 70,封装:SOIC (DW)-20,包装数量MPQ:25个,MSL 等级/回流焊峰值温度:Level-2-260C-1 YEAR,引脚镀层/焊球材料:NIPDAU,TI官网UCC38503DW的批量USD价格:2.73(1000+)

UCC38503DWTR,工作温度:0 to 70,封装:SOIC (DW)-20,包装数量MPQ:2000个,MSL 等级/回流焊峰值温度:Level-2-260C-1 YEAR,引脚镀层/焊球材料:NIPDAU,TI官网UCC38503DWTR的批量USD价格:2.275(1000+)

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