STCH03

量産中
Design Win Education

Offline PWM controller for low standby adapters

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製品概要

概要

The STCH03 current-mode controller is designed 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.

Constant output voltage (CV) regulation loop is achieved by secondary side feedback, the output voltage information is transfered via an optocoupler on the FB pin of the STCH03 to get the selected output voltage.

The device features a unique characteristic: it is capable of providing constant output current regulation (CC) 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 154 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 undervoltage protection (UVP) 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.

  • 特徴

    • 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

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品質 & 信頼性

製品型番 マーケティング・ステータス パッケージ グレード RoHSコンプライアンスグレード 材料宣誓書**
STCH03
量産中
SO-8 インダストリアル Ecopack2
STCH03TR
量産中
SO-8 インダストリアル Ecopack2

STCH03

Package:

SO-8

Material Declaration**:

PDF XML

Marketing Status

量産中

Package

SO-8

Grade

Industrial

RoHS Compliance Grade

Ecopack2

STCH03TR

Package:

SO-8

Material Declaration**:

PDF XML

Marketing Status

量産中

Package

SO-8

Grade

Industrial

RoHS Compliance Grade

Ecopack2

(**) st.comで提供している材料宣誓書は、パッケージ・ファミリ内で最も一般的に使用されているパッケージに基づく汎用ドキュメントの場合があります。そのため、特定の製品では100%正確ではない可能性があります。特定の製品情報については、セールスサポートまでお問い合わせください

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製品型番
製品ステータス
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Order from distributors
パッケージ
梱包タイプ
RoHS
Country of Origin
ECCN (US)
ECCN (EU)
STCH03TR
Available at distributors

販売代理店在庫 STCH03TR

販売代理店
地域 在庫 最小発注数量 パートナー企業リンク

販売代理店在庫データ:

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STCH03
Available at distributors

販売代理店在庫 STCH03

販売代理店
地域 在庫 最小発注数量 パートナー企業リンク

販売代理店在庫データ:

販売代理店に在庫がない場合は、STのセールス・オフィスまでお問い合わせください

STCH03TR 量産中

Budgetary Price (US$)*/Qty:
-
パッケージ:
梱包タイプ:
RoHS:
Country of Origin:
ECCN (US):
ECCN (EU):

製品型番:

STCH03TR

販売代理店

販売代理店在庫データ:

STCH03 量産中

Budgetary Price (US$)*/Qty:
-
パッケージ:
梱包タイプ:
RoHS:
Country of Origin:
ECCN (US):
ECCN (EU):

製品型番:

STCH03

販売代理店

販売代理店在庫データ:

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(*)概算用の参考価格(US$)です。現地通貨でのお見積りについては、STのセールス・オフィスまたは販売代理店までお問い合わせください。