L6983I

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

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产品概述

描述

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.

  • 所有功能

    • 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
    • Enable
    • 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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STMicroelectronics - L6983I

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质量与可靠性

产品型号 Marketing Status 等级规格 符合RoHS级别 材料声明**
L6983IQTR
批量生产
QFPN 3X3X0.80 16L PITCH 0.50 工业 Ecopack3

L6983IQTR

Package:

QFPN 3X3X0.80 16L PITCH 0.50

Material Declaration**:

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Marketing Status

批量生产

Package

QFPN 3X3X0.80 16L PITCH 0.50

Grade

Industrial

RoHS Compliance Grade

Ecopack3

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L6983IQTR
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L6983IQTR 批量生产

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(*) 建议转售单价(美元)仅用于预算用途。如需以当地货币计价的报价,请联系您当地的 ST销售办事处 或我们的 经销商