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The L6566B is an extremely versatile current-mode primary controller ICs, specifically designed for high-performance offline flyback converters. It is also suited for single-stage single-switch input-current-shaping converters (single-stage PFC) for applications supposed to comply with EN61000-3-2 or JEITA-MITI regulations.
Both fixed-frequency (FF) and quasi-resonant (QR) operation are supported. The user can pick either of the two depending on application needs. The device features an externally programmable oscillator: it defines converters switching frequency in FF mode and the maximum allowed switching frequency in QR mode.
When FF operation is selected, the ICs work like a standard current-mode controller with a maximum duty cycle limited at 70 % min. The oscillator frequency can be modulated to mitigate EMI emissions.
QR operation, when selected, occurs at heavy load and is achieved through a transformer demagnetization sensing input that triggers MOSFETs turn-on. Under some conditions, ZVS (zero-voltage switching) can be achieved. Converters power capability rise with the mains voltage is compensated by line voltage feedforward. At medium and light load, as the QR operating frequency equals the oscillator frequency, a function (valley skipping) is activated to prevent further frequency rise and keep the operation as close to ZVS as possible.
With either FF or QR operation, at very light load the ICs enter a controlled burst-mode operation that, along with the built-in non-dissipative high-voltage start-up circuit and the low quiescent current, helps keep low the consumption from the mains and meet energy saving recommendations.
An innovative adaptive UVLO helps minimize the issues related to the fluctuations of the self-supply voltage due to transformers parasites.
The protection functions included in this device are: not-latched input undervoltage (brownout), output OVP (auto-restart or latch-mode selectable), a first-level OCP with delayed shutdown to protect the system during overload or short circuit conditions (autorestart or latch-mode selectable) and a second-level OCP that is invoked when the transformer saturates or the secondary diode fails short. A latched disable input allows easy implementation of OTP with an external NTC, while an internal thermal shutdown prevents IC overheating.
Programmable soft-start, leading-edge blanking on the current sense input for greater noise immunity, slope compensation (in FF mode only), and a shutdown function for externally controlled burst-mode operation or remote ON/OFF control complete the equipment of this device.主要特性
- Latched or autorestart OVP
- Programmable frequency modulation for EMI reduction
- -600/+800 mA totem pole gate driver with active pull-down during UVLO
- Brownout protection
- SO16N package
- Pulse-by-pulse OCP, shutdown on overload (latched or autorestart)
- Line feedforward for constant power capability vs. mains voltage
- Selectable multi-mode operation: fixed frequency or quasi-resonant
- Advanced light load management
- On-board 700 V high-voltage start-up
- Adaptive UVLO
- Transformer saturation detection
- Low quiescent current (< 3 mA)
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产品规格 (1)
| Resource title | Latest update | |||
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| 25 Sep 2020 |
25 Sep 2020
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应用手册 (2)
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| 13 Sep 2018 |
13 Sep 2018
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| 13 Sep 2018 |
13 Sep 2018
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Design Notes & Tips (1)
| Resource title | Latest update | |||
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| 25 Jul 2018 |
25 Jul 2018
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工具/软件相关的应用笔记 (1)
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| 25 Nov 2014 |
25 Nov 2014
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| Resource title | Latest update | |||
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| 21 Jun 2018 |
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CAD/EDA Symbols, Footprints and Models
质量与可靠性
| 产品型号 | Marketing Status | 封装 | 等级规格 | 符合RoHS级别 | 材料声明** |
|---|---|---|---|---|---|
| L6566B |
批量生产
|
SO-16 | 工业 | Ecopack2 | |
| L6566BTR |
批量生产
|
SO-16 | 工业 | Ecopack2 |
(**) 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 。
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样片和购买
| 产品型号 | 从分销商订购 | 从ST订购 | 供货状态 | ECCN (US) | ECCN (EU) | 包装类型 | 封装 | 温度（ºC） | Country of Origin | Budgetary Price (US$)*/Qty | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 最小值 | 最大值 | |||||||||||
| L6566B | 6 distributors | 立即购买 |
批量生产
|
EAR99 | NEC | Tube | SO-16 | - | - | PHILIPPINES | 0.6816 / 1k | |
| L6566BTR | 5 distributors | 样片和购买 立即购买 |
批量生产
|
EAR99 | NEC | Tape And Reel | SO-16 | - | - | PHILIPPINES | 0.6816 / 1k | |
