UC3856 改进的电流模式 PWM 控制器
UC3856 描述
The UC3856 is a high performance version of the popular UC3846 series of current mode controllers, and is intended for both design upgrades and new applications where speed and accuracy are important. All input to output delays have been minimized, and the current sense output is slew rate limited to reduce noise sensitivity. Fast 1.5A peak output stages have been added to allow rapid switching of power FETs.
A low impedance TTL compatible sync output has been implemented with a tri-state function when used as a sync input.
Internal chip grounding has been improved to minimize internal \x93noise\x94 caused when driving large capacitive loads. This, in conjunction with the improved differential current sense amplifier results in enhanced noise immunity.
|
UC1856 |
UC2856 |
UC3856 |
| Topology |
Boost, Flyback, Forward, Full-Bridge, Half-Bridge, Push-Pull |
Boost, Flyback, Forward, Full-Bridge, Half-Bridge, Push-Pull |
Boost, Buck, Flyback, Forward, Full-Bridge, Half-Bridge, Push-Pull |
| Control Method |
Current Mode |
Current Mode |
Current Mode |
| Duty Cycle(Max)(%) |
50 |
50 |
50 |
| Frequency(Max)(kHz) |
1000 |
1000 |
1000 |
| UVLO Thresholds On/Off(V) |
7.7/7 |
7.7/7 |
7.7/7 |
| Pin/Package |
16CDIP, 20LCCC |
16PDIP, 16SOIC |
16PDIP, 16SOIC, 20PLCC |
| Regulated Outputs(#) |
2 |
2 |
2 |
| Operating Temperature Range(°C) |
-55 to 125 |
-40 to 85 |
0 to 70 |
| Rating |
Military |
Catalog |
Catalog |
UC3856 特性
- Pin-for-Pin Compatible With the UC3846
- 65ns Typical Delay From Shutdown to Outputs, and 50ns Typical Delay From Sync to Outputs
- Improved Current Sense Amplifier With Reduced Noise Sensitivity
- Differential Current Sense with 3V Common Mode Range
- Trimmed Oscillator Discharge Current for Accurate Deadband Control
- Accurate 1V Shutdown Threshold
- High Current Dual Totem Pole Outputs (1.5A peak)
- TTL Compatible Oscillator SYNC Pin Thresholds
- 4kV ESD Protection
UC3856 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 |
| UC3856DW |
ACTIVE |
0 to 70 |
1.90 | 1ku |
SOIC (DW) | 16 |
40 | TUBE |
UC3856DW |
| UC3856DWG4 |
ACTIVE |
0 to 70 |
1.90 | 1ku |
SOIC (DW) | 16 |
40 | TUBE |
UC3856DW |
| UC3856DWTR |
ACTIVE |
0 to 70 |
1.70 | 1ku |
SOIC (DW) | 16 |
2000 | LARGE T&R |
UC3856DW |
| UC3856DWTRG4 |
ACTIVE |
0 to 70 |
1.70 | 1ku |
SOIC (DW) | 16 |
2000 | LARGE T&R |
UC3856DW |
| UC3856N |
ACTIVE |
0 to 70 |
1.90 | 1ku |
PDIP (N) | 16 |
25 | TUBE |
UC3856N |
| UC3856NG4 |
ACTIVE |
0 to 70 |
1.90 | 1ku |
PDIP (N) | 16 |
25 | TUBE |
UC3856N |
| UC3856Q |
ACTIVE |
0 to 70 |
2.25 | 1ku |
PLCC (FN) | 20 |
46 | TUBE |
UC3856Q |
| UC3856QG3 |
ACTIVE |
0 to 70 |
2.25 | 1ku |
PLCC (FN) | 20 |
46 | TUBE |
UC3856Q |
UC3856 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 |
| UC3856DW |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
|
UC3856DW |
| UC3856DWG4 |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
UC3856DWG4 |
UC3856DWG4 |
| UC3856DWTR |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
|
UC3856DWTR |
| UC3856DWTRG4 |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
Level-2-260C-1 YEAR |
UC3856DWTRG4 |
UC3856DWTRG4 |
| UC3856N |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
N/A for Pkg Type |
|
UC3856N |
| UC3856NG4 |
Green (RoHS & no Sb/Br) |
CU NIPDAU |
N/A for Pkg Type |
UC3856NG4 |
UC3856NG4 |
| UC3856Q |
Green (RoHS & no Sb/Br) |
CU SN |
Level-2-260C-1 YEAR |
|
UC3856Q |
| UC3856QG3 |
Green (RoHS & no Sb/Br) |
CU SN |
Level-2-260C-1 YEAR |
|
UC3856QG3 |
UC3856 应用技术支持与电子电路设计开发资源下载
- UC3856 数据资料 dataSheet 下载.PDF
- TI 德州仪器AC/DC 和 DC/DC 电源产品选型与价格参考 . xls
- Dual MOSFET Driver
(PDF 498 KB)
- 标准线性产品交叉参考 (Rev. D)
(PDF 1058 KB)
- 模数规格和性能特性术语表 (Rev. A) (PDF 1993 KB)
- 所选封装材料的热学和电学性质 (PDF 645 KB)
- 高速数据转换 (PDF 1967 KB)
- Shelf-Life Evaluation of Lead-Free Component Finishes (PDF
1305 KB)
- Analog-to-Digital Converter Grounding Practices Affect System
Performance (PDF 56 KB)
- Principles of Data Acquisition and Conversion (PDF 50 KB)
- Interleaving Analog-to-Digital Converters (PDF 64 KB)
- What
Designers Should Know About Data Converter Drift (PDF 95 KB)
- Giving Delta-Sigma Converters a Gain Boost with a Front End
Analog Gain Stage (PDF 70 KB)
- Programming Tricks for Higher Conversion Speeds Utilizing Delta
Sigma Converters (PDF 105 KB)
UC3856 工具与软件
