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UCC38502 BiCMOS PFC/PWM 组合控制器

	UCC38502
UVLO Thresholds On/Off(V)	16/10
Operating Supply(Max)(V)	18
Startup Current(mA)	0.15
Operating Supply Current(mA)	4
Vref(V)	7.5
Vref tol(%)	1.5
Duty Cycle(Max)(%)	100
Practical Operating Frequency(Max)(MHz)	0.2
Pin/Package	20PDIP, 20SOIC
Rating	Catalog

UCC38502 描述

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.

UCC38502 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

UCC38502 芯片订购指南

器件	状态	温度 (oC)	价格（美元）	封装 | 引脚	封装数量 | 封装载体	丝印标记
UCC38502DW	ACTIVE	-40 to 85	3.55 | 1ku	SOIC (DW) | 20	25 | TUBE	UCC38502DW
UCC38502DWG4	ACTIVE	-40 to 85	3.55 | 1ku	SOIC (DW) | 20	25 | TUBE	UCC38502DW
UCC38502N	ACTIVE	-40 to 85	3.55 | 1ku	PDIP (N) | 20	20 | TUBE	UCC38502N
UCC38502NG4	ACTIVE	-40 to 85	3.55 | 1ku	PDIP (N) | 20	20 | TUBE	UCC38502N

UCC38502 质量与无铅数据

器件	环保计划*	铅/焊球涂层	MSL 等级/回流焊峰	环保信息与无铅 (Pb-free)	DPPM / MTBF / FIT 率
UCC38502DW	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR		UCC38502DW
UCC38502DWG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	UCC38502DWG4	UCC38502DWG4
UCC38502N	Green (RoHS & no Sb/Br)	CU NIPDAU	N/A for Pkg Type		UCC38502N
UCC38502NG4	Green (RoHS & no Sb/Br)	CU NIPDAU	N/A for Pkg Type	UCC38502NG4	UCC38502NG4

UCC38502 应用技术支持与电子电路设计开发资源下载

1. UCC38502 数据资料 dataSheet 下载.PDF
2. TI 德州仪器AC/DC 和 DC/DC 电源产品选型与价格参考 . xls
3. Dual MOSFET Driver (PDF  498 KB)
4. 标准线性产品交叉参考 (Rev. D)   (PDF  1058 KB)
5. 模数规格和性能特性术语表 (Rev. A) (PDF 1993 KB)
6. 所选封装材料的热学和电学性质 (PDF 645 KB)
7. 高速数据转换 (PDF 1967 KB)
8. Shelf-Life Evaluation of Lead-Free Component Finishes (PDF 1305 KB)
9. Analog-to-Digital Converter Grounding Practices Affect System Performance (PDF 56 KB)
10. Principles of Data Acquisition and Conversion (PDF 50 KB)
11. Interleaving Analog-to-Digital Converters (PDF 64 KB)
12. What Designers Should Know About Data Converter Drift (PDF 95 KB)
13. Giving Delta-Sigma Converters a Gain Boost with a Front End Analog Gain Stage (PDF 70 KB)
14. Programming Tricks for Higher Conversion Speeds Utilizing Delta Sigma Converters (PDF 105 KB)

UCC38502 工具与软件

名称	型号	公司	工具/软件类型
音频的快速搜索选择工具	AUDIO_SELECTION_TOOL	Texas Instruments	免费评估工具
UCC38502 评估模块	UCC38502EVM	Texas Instruments	开发电路板/EVM
用于音频转换器的软件驱动程序	CODECDRIVERS-SW	Texas Instruments	应用软件

UCC38502 参考设计

说明	型号	公司
BiCMOS PFC/PWM 组合控制器	UCC38500REF	Texas Instruments