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基于ST STCH03脉宽调制(PWM)控制器的15W低待机功耗的适配器电源解决方案

来源: 大大通
2018-11-16
类别:电源管理
eye 363
文章创建人 拍明

原标题:基于ST STCH03的15W低待机功耗的适配器电源方案

  

  意法半导体的STCH03脉宽调制(PWM)控制器拥有很高的集成度,采用一次侧调整技术实现精确的恒流输出,帮助经济型手机充电器,电源适配器或辅助电源更好地满足能效法规对平均效率和待机功率的严格限制。

  在负载较低时,为最大限度地提高能效,STCH03进入准谐振模式(ZVS),通过检测变压器退磁来控制零电压开关操作。检测电路还提供电压前馈控制功能,以确保恒流调整的精度,STCH03将运行电流维持在变压器连续(CCM)和不连续(DCM)电流的工作边界,根据线路/负载条件将转换器的最高工作频率限制在167kHz,并且随着负载的降低实现波谷跳跃,以取得最高的能效。

  节能功能包括零功率高压启动电路以及负载非常低或断开时的低静态电流和突发模式切换等,可将待机功率保持在15毫瓦以下,以帮助充电器和适配器符合严格的法规要求,例如,即将发布的CoC Tier 2电源效率规范。低峰流可消除轻负载或无负载时的人耳可听噪声。在变压器辅助偏置电压值较低时,STCH03的自适应欠压锁定(UVLO)创新功能可确保目标应用连续稳定地工作。

  凭借准确的一次侧恒流调整技术,STCH03不需额外的输出电流检测组件,从而减少了充电器物料清单(BOM)费用。内部集成的启动电路在不工作时不耗电,也可以节省外部组件。

  STCH03还有很多有助于节省外部组件和BOM成本的功能,包括过热保护(OTP)和过压保护(OVP),这些保护功能都有自动重启功能,部分产品(STCH03L型号)还可选择保护锁定此外,软启动可防止启动时出现高峰值电流,在设备出现输出短路或在恒定电流控制下输出电压过低时,输出欠压保护功能确保设备安全运行。

  STCH03采用开发人员熟悉的SO-8封装附650V高压启动功能,现已投入生产。

  场景应用图

场景应用图.png

  展示板照片

展示板照片.png

  方案方块图

方案方块图.png

  核心技术优势

  1.极低待机功耗15mW at 230VAC

  2.650V高压启动,PWM QR模式操作

  3.OVP,UVP,OCP,OTP等保护功能

  方案规格

  1.输入:90~264VAC

  2.输出:5V/3.1A

  3.待机功耗:15mW

  4.效率:81.84%(full load) & 72.48%(10%load)

  技术文档

类别标题档案
硬件Gerber

22500_GERBERFILE_20180828085434.zip

硬件Power test report

22500_TESTREPORTFILE_20180912141544.pdf

硬件Datasheet

22500_OTHERFILE_20180912142008.pdf

  【STCH03】

  Offline PWM controller for low standby adapters

  The STCH03 current-mode controller isdesigned for an offline quasi-resonant ZVS (zero-voltage-switching at switch turn-on) flyback converter.

  It combines a high-performance low-voltage PWM controller chip and a 650V HV start-up cell in the same package.

  The device features a unique characteristic: it is capable of providing constant output current (CC) regulation using primary-sensing feedback. This eliminates the need for dedicated current reference IC, as well as the current sensor, still maintaining quite accurate output current regulation.

  The quasi-resonant operation is achieved by means of a transformer demagnetization sensing input that triggers the turn-on of the MOSFET, connected on the ZCD pin. This input serves also as both output voltage monitor, to achieve mains-independent CC regulation (line voltage feedforward), and to implement OVP and UVP.

  The maximum switching frequency is top-limited below 167 kHz, so that at the medium-light load a special function automatically lowers the operating frequency whilst still maintaining the operation as close to ZVS as possible. At the very light load, the device enters a controlled burst-mode operation that, along with the zero-power high-voltage start-up circuit, the extremely low quiescent current of the device, helps minimize the residual input consumption, thus meeting the requirements of the most stringent standards.

  During the burst-mode operation the VDD supply voltage has to be guaranteed by optimum application design. In any case, an innovative adaptive UVLO helps to minimize the issues related to the fluctuations of the auxiliary biasing voltage with the output load, due to parasitic capacitance of the transformer and further reducing the IC's bias consumption.

  In addition to these functions that optimize power handling under different operating conditions, the device also offers the output overvoltage protection (OVP), overtemperature protection (OTP), hiccup-mode protection that is invoked when the transformer saturates or the secondary diode fails short and the output UVP protection that limits the average output current in case of the output short-circuit. All the protections are auto-restart mode, except the OVP protection, that can be internally selected to be auto-restart or latched mode.

  The embedded leading-edge blanking on the current sense input for greater noise immunity completes the equipment of this device.

  Key Features

  Advanced power management for ultra-low standby power consumption (under 10 mW at 230 VAC)

  Fully integrated primary side constant current output regulation (CC)

  650 V embedded HV start-up circuit with zero power consumption.

  Quasi-resonant (QR) zero-voltage-switching (ZVS) operation

  Accurate and adjustable output OVP with options auto-restart (STCH03) or latched (STCH03L) after fault

  Output undervoltage protection (UVP) with auto-restart

  Input voltage feedforward compensation for mains-independent CC regulation

  Embedded thermal shutdown

  Intelligent frequency jitter for EMI suppression

  SO8 package


责任编辑:David

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