L6983I

量産中
Design Win Education

38 V, 10 W synchronous iso-buck converter for isolated applications

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製品概要

概要

The L6983I is a device specifically designed for isolated buck topology. The primary output voltage can be accurately adjusted, whereas the isolated secondary output is derived by using a given transformer ratio. No optocoupler is required. The primary sink capability up to -4.5 A (even during soft-start) allows a proper energy transfer to the secondary side as well as enabling a tracked soft-start of the secondary output. The control loop is based on a peak current mode architecture and the device operates in forced PWM. The 390 ns blanking time filters oscillations, generated by the transformer leakage inductance, making the solution more robust.

The compact QFN16 3x3 mm package and the internal compensation of the L6983I help minimize design complexity and size.

The switching frequency can be programmed in the 200 kHz - 1 MHz range with optional spread spectrum for improved EMC. The EN pin provides enable/disable functionality.

The typical shutdown current is 2 μA when disabled. As soon as the EN pin is pulled up the device is enabled and the internal 1.3 ms soft-start takes place. The L6983I features Power Good open collector that monitors the FB voltage. Pulse by pulse current sensing on both power elements implements an effective constant current protection and thermal shutdown prevents thermal run-away.

  • 特徴

    • Designed for iso-buck topology
    • 3.5 V to 38 V operating input voltage
    • Primary output voltage regulation / no optocoupler required
    • 4.5 A source / sink peak primary current capability
    • Peak current mode architecture in forced PWM operation
    • 390 ns blanking time
    • 200 kHz to 1 MHz programmable switching frequency. Stable with low ESR capacitor: min 2 µF
    • Internal compensation network
    • 2 μA shutdown current
    • Internal soft-start
    • 有効にする
    • Overvoltage protection
    • Output voltage sequencing
    • Thermal protection
    • Optional spread spectrum for improved EMC
    • Power Good
    • Synchronization to external clock
    • QFN16 (3x3 mm) 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**
L6983IQTR
量産中
QFPN 3X3X0.80 16L PITCH 0.50 インダストリアル Ecopack3

L6983IQTR

Package:

QFPN 3X3X0.80 16L PITCH 0.50

Material Declaration**:

PDF XML

Marketing Status

量産中

Package

QFPN 3X3X0.80 16L PITCH 0.50

Grade

Industrial

RoHS Compliance Grade

Ecopack3

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L6983IQTR
Available at distributors

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L6983IQTR 量産中

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L6983IQTR

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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。