H-Bridge Driver Circuit Using Isolated Half-Bridge Drivers (CN0196)

The circuit, shown in Figure 1, is an H-bridge composed of high power switching MOSFETs that are controlled by low voltage logic signals. The circuit provides a convenient interface between logic signals and the high power bridge. The bridge uses low cost N-channel power MOSFETs for both the high and low sides of the H-bridge. The circuit also provides galvanic isolation between the control side and power side. This circuit can be used in motor control, power conversion with embedded control interface, lighting, audio amplifiers, and uninterruptable power supplies (UPS).

Modern microprocessors and microconverters are generally low power and operate on low supply voltages. Source and sink current for 2.5 V CMOS logic outputs ranges from μA to mA . Driving an H-bridge switching 12 V with a 4 A peak current requires the use of carefully selected interface and level translation components, especially if low jitter is needed.


The ADG787 is a low voltage CMOS device that contains two independently selectable single-pole double-throw (SPDT) switches. With a 5 V dc power supply, a voltage as low as 2 V is a valid high input logic voltage. Therefore, the ADG787 provides appropriate level translation from the 2.5 V controlling signal to the 5 V logic level needed to drive the ADuM7234 half-bridge driver.

The ADuM7234 is an isolated, half-bridge gate driver that employs Analog Devices’ iCoupler® technology to provide independent and isolated high-side and low-side outputs making it possible to use N-channel MOSFETs exclusively in the H-bridge. There are several benefits in using N-channel MOSFETs: N-channel MOSFETs typically have one third of the on resistance of P-channel MOSFETs and higher maximum current; they switch faster, thereby reducing power dissipation; and the rise time and fall time is symmetrical.

The 4 A peak drive current of the ADuM7234 ensures that the power MOSFETs can switch on and off very fast, thereby minimizing the power dissipation in the H-bridge stage. The maximum drive current of the H-bridge in this circuit can be up to 85 A, which is limited by the maximum allowable MOSFET current.

The ADuC7061 is a low power, ARM7 based precision analog microcontroller with integrated pulse width modulated (PWM) controllers that have outputs that can be configured to drive an H-bridge after suitable level translation and conditioning.



Figure 1. H-Bridge Using ADuM7234 Isolated Half-bridge Driver (Simplified Schematic: All Connections and Decoupling Not Shown)

Возможности

  • High power MOSFETS
  • Galvantic isolation between control and power
  • H-bridge driving circuit

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H-Bridge Driver Circuit Using Isolated Half-Bridge Drivers  CN0196

Используемые компоненты

Производитель: Analog Devices Inc.
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ADUM7234BRZ
ADUM7234BRZ
Analog Devices Inc.
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Доступно: 27306 шт.
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ISOLATED PRECISION HALF-BRIDGE DRIVER, 4 A
ADUM7234BRZ
27306 шт.
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ADUM3100BRZ
ADUM3100BRZ
Analog Devices Inc.
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ISOLATOR, DIGITAL 100MSPS, SOIC8
ADUM3100BRZ
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ADG787BRMZ
ADG787BRMZ
Analog Devices Inc.
Арт.: 1105642 PDF RD
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SWITCH, MUX/DEMUX DUAL 2:1, MSOP10
ADG787BRMZ
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ADG787BRMZ-500RL7
Analog Devices Inc.
Арт.: 1203621 RD
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ADG787BRMZ-500RL7
6781 шт.
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ADUM3100ARZ
ADUM3100ARZ
Analog Devices Inc.
Арт.: 1890264 PDF RD
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DIGITAL ISOLATOR, 1CH, 8SOIC
ADUM3100ARZ
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ADUM3100ARZ-RL7
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Арт.: 2290365 ИНФО RD
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ADUM3100BRZ-RL7
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ADG787BCBZ-500RL7
ADG787BCBZ-500RL7
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Арт.: 2390015 PDF RD
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ANALOGUE SW, 2CH, SPDT, WLCSP-10
ADG787BCBZ-500RL7
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ADUM7234BRZ-RL7
Analog Devices Inc.
Арт.: 2391431 RD
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