TEXAS INSTRUMENTS UCC38500DW.. 芯片, PFC/PWM控制器, 20-SOIC
The is a BiCMOS PFC/PWM Combination Controller provides all of the control functions necessary for an active power-factor-corrected pre-regulator 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 feed-forward 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.
型号 | 品牌 | 下载 |
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UCC38500DW | TI 德州仪器 | 下载 |
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UCC3973PW | TI 德州仪器 | 下载 |
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UCC3921D | TI 德州仪器 | 下载 |
UCC3918DP | TI 德州仪器 | 下载 |
UCC3837D | TI 德州仪器 | 下载 |
UCC3837DG4 | TI 德州仪器 | 下载 |
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