MAXREFDES1178
Reference Guide
描述
Power over Ethernet (PoE) is a technology that allows network cables to deliver power to a powered device (PD) through power-sourcing equipment (PSE) or midspan, and has many advantages over traditional methods of delivering power. PoE allows power and data to be combined, removing the need for altering the AC mains infrastructure and can be installed by non-electricians. PoE is an intelligent system designed with protection at the forefront, preventing overload, underpowering, and installation errors, while allowing simple scalability and reliability.
The MAX17690 eliminates the need for an optocoupler or auxiliary transformer winding and achieves ±5% output voltage regulation over line, load, and temperature variations. The MAX17690 implements an innovative algorithm to accurately determine the output voltage by sensing the reflected voltage across the primary winding during the flyback time interval. By sampling and regulating this reflected voltage when the secondary current is close to zero, the effects of secondary-side DC losses in the transformer winding, the PCB tracks, and the rectifying diode on output voltage regulation can be minimized.
The MAX17690 also compensates for the negative temperature coefficient of the rectifying diode.
特征
- IEEE® 802.3af/at Compliance
- Thermally Enhanced, 3mm × 3mm, 10-Pin TDFN Package (MAX5969B)
- 30V to 60V Input Voltage Range
- Programmable Switching Frequency from 50kHz to 250kHz
- Programmable Input Enable/UVLO Feature
- Programmable Input Overvoltage Protection
- Adjustable Soft-Start
- 2A/4A Peak Source/Sink Gate Drive Capability
- Hiccup Mode Short-Circuit Protection
- Fast Cycle-by-Cycle Peak Current Limit
- Thermal Shutdown Protection
- Space-Saving, 16-Pin, 3mm x 3mm TQFN Package
- -40°C to +125°C Operating Temperature Range
Enlarge
示意图
PCB布局
物料清单(BOM)
试验结果
参数化
| 输入类型 | Vin(Min) | Vin(Max) | Iout(Max) | 单路/多路输出 | Vout(V) | Pout(W) | 隔离/非隔离 | 拓扑 |
|---|---|---|---|---|---|---|---|---|
| DC | 30 | 60 | 0.6 | - | 12 | 7.2 | Isolated | Flyback |
参数化
| 输入类型 | DC |
| Vin(Min) | 30 |
| Vin(Max) | 60 |
| Iout(Max) | 0.6 |
| 单路/多路输出 | - |
| Vout(V) | 12 |
| Pout(W) | 7.2 |
| 隔离/非隔离 | Isolated |
| 拓扑 | Flyback |
Maxim设备 (3)
器件号
|
名称
|
产品线
|
购买
|
设计套件和评估模块 |
|---|---|---|---|---|
| MAX5969B | IEEE 802.3af/at兼容、受电设备接口控制器，集成功率MOSFET | 保护IC | 立即购买 | Design Kits |
| MAX17690 | 60V、无光耦、隔离反激控制器 | 隔离电源 | 立即购买 | Design Kits |
| MAX17606 | 副边同步MOSFET驱动器，用于反激转换器 | 隔离电源 | 立即购买 | Design Kits |
Maxim设备 (3)
| 器件号
|
产品线
|
|---|---|
|
保护IC
IEEE 802.3af/at兼容、受电设备接口控制器，集成功率MOSFET
|
|
|
隔离电源
60V、无光耦、隔离反激控制器
|
|
|
隔离电源
副边同步MOSFET驱动器，用于反激转换器
|
设计资料 (4)
| 标题
|
类型
|
尺寸
|
日期
|
|---|---|---|---|
 maxrefdes1178-pcb |
2MB | 2019-01-25 | |
| MAXREFDES1178 Test Results |
370KB | 2019-01-25 | |
| maxrefdes1178-schematic |
26KB | 2019-01-25 | |
| maxrefdes1178-bom |
105KB | 2019-01-25 |
| 日期
|
类型
|
|---|---|
| 2019-01-25 |
(PDF, 2MB) |
| 2019-01-25 |
(PDF, 370KB) |
| 2019-01-25 |
(PDF, 26KB) |
| 2019-01-25 |
(PDF, 105KB) |
询价申请