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The EVL6566B-65W-QR is a demonstration board tailored on specification of a typical hi-end portable computer power supply. The peculiarities of this design are the very high average efficiency of about 90% without synchronous rectification and very low no load consumption of 100mW at 230 Vac. The result is that this converter is compliant to energy star eligibility criteria. The flyback stage implements the new ST dedicated current mode controller L6566B, operating in quasi-resonant mode and detecting the transformer demagnetization by pin ZCD.
The resistor on pin OSC sets the maximum switching frequency at about 165 kHz.
Because the maximum switching frequency is imposed, the converter operates in discontinuous conduction mode during light load operation. The L6566B valley skipping function is capable to turn-on the MOSFET in valley switching even in DCM, thus reducing switching losses.
The Power MOSFET is a standard 800 V, STF7NM80, housed in TO-220FP package, needing just a small heat sink. The transformer is layer type, using a standard ferrite size EER28L, designed according to the EN60950.
The flyback reflected voltage is ~150 V, providing enough room for the leakage inductance voltage spike with good margin for the reliability of the MOSFET.
The output rectifiers are two, dual centre tap Schottky diode in parallel, STPS20H100CFP, housed in TO-220FP. They have been selected according to the maximum reverse voltage, forward voltage drop and power dissipation. The snubber damps the oscillation produced by the diode capacitance and the leakage inductance.
A small LC filter has been added on the output, filtering the high frequency ripple and spikes.
Thanks to the L6566B valley skipping feature it has been possible to dimension the power transformer parameters optimizing efficiency at different loads achieving an outstanding result even without synchronous rectification.主要特性
- Universal input mains range: 90 264 Vac - frequency 45 ÷ 65Hz
- Output voltage: 19 V @ 3.42 A continuous operation
- Mains harmonics: according to EN61000-3-2 Class-D or JEITA-MITI Class-D
- Stand-by mains consumption: <100 mW @ 230 Vac
- Average efficiency: better than 89% without synchronous rectification
- EMI: according to EN55022-Class-B
- Safety: according to EN60950
- Dimensions: 58x121 mm, 25 mm components maximum height
- PCB: single side, 35 μm, CEM-1, mixed PTH/SMT
All resources
产品规格 (1)
| Resource title | Latest update | |||
|---|---|---|---|---|
| 26 Sep 2020 |
26 Sep 2020
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应用手册 (1)
| Resource title | Latest update | |||
|---|---|---|---|---|
| 13 Sep 2018 |
13 Sep 2018
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Board Manufacturing Specifications (1)
| Resource title | Latest update | |||
|---|---|---|---|---|
| ZIP | 24 Mar 2015 |
24 Mar 2015
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物料清单 (1)
| Resource title | Latest update | |||
|---|---|---|---|---|
| 24 Mar 2015 |
24 Mar 2015
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Schematics (1)
| Resource title | Latest update | |||
|---|---|---|---|---|
| 24 Mar 2015 |
24 Mar 2015
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宣传册 (1)
| Resource title | Latest update | |||
|---|---|---|---|---|
| 20 Nov 2018 |
20 Nov 2018
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质量与可靠性
| 产品型号 | Marketing Status | 封装 | 等级规格 | 符合RoHS级别 | WEEE Compliant | 材料声明** |
|---|---|---|---|---|---|---|
| EVL6566B-65W-QR |
批量生产
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CARD | 工业 | Ecopack1 | - |
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EVL6566B-65W-QR
Package:
CARDMaterial Declaration**:
(**) st.com上提供的材料声明表单可能是基于包装系列中最常用的封装的通用文档。因此，它们可能不是100%适用于特定的设备。有关特定设备的信息，请联系 销售支持 。
样片和购买
| 产品型号 | 从分销商订购 | 从ST订购 | 核心产品 | 供货状态 | 供应商 | ECCN (US) | ECCN (EU) | Country of Origin | Board production status | Budgetary Price (US$)*/Qty | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| EVL6566B-65W-QR | 3 distributors | Buy Direct | L6566BH |
批量生产
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- | EAR99 | NEC | ITALY | - |
