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AMC3301-Q1 Scheda tecnica(PDF) 21 Page - Texas Instruments

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Il numero della parte AMC3301-Q1
Spiegazioni elettronici  AMC3301-Q1 Precision, 짹250-mV Input, Reinforced Isolated Amplifier With Integrated DC/DC Converter
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Produttore elettronici  TI [Texas Instruments]
Homepage  http://www.ti.com
Logo TI - Texas Instruments

AMC3301-Q1 Scheda tecnica(HTML) 21 Page - Texas Instruments

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-2.567 V
VOUTN
VOUTP
Figure 7-5. Typical Failsafe Output of the AMC3301-Q1
7.3.4 Isolated DC/DC Converter
The AMC3301-Q1 offers a fully integrated isolated DC/DC converter stage that includes following components
illustrated in Section 7.2:
• Low-dropout regulator (LDO) on the primary side to stabilize the supply voltage VDD that drives the primary
side of the converter
• Primary full-bridge inverter and drivers
• Laminate-based, air-core transformer for high immunity to magnetic fields
• Secondary full-bridge rectifier
• Secondary LDO to stabilize the output voltage of the DC/DC converter for high analog performance of the
signal path
The DC/DC converter uses a spread-spectrum clock generation technique to reduce the spectral density of the
electromagnetic radiation. The resonator frequency is synchronized to the operation of the ΔΣ modulator to
minimize the interference with data transmission and support the high analog performance of the device.
The architecture of the DC/DC converter is optimized to drive the high-side circuitry of the AMC3301-Q1 and can
source up to IH of additional DC current for an optional auxiliary circuit such as an active filter, pre-amplifier or
comparator. IH is specified in the Electrical Characteristics table in Section 6 as a DC, non-switching current.
7.3.5 Diagnostic Output
The open-drain DIAG pin can be monitored to confirm the device is operational, and the output voltage is valid.
During power-up, the DIAG pin is actively held low until the high-side supply is in regulation and the device
operates properly. During normal operation the DIAG pin is in high-impedance (HiZ) state and pulled high
through an external pull-up resistor. The DIAG pin is actively pulled low if:
• The low-side does not receive data from the high-side (for example, because of a loss of power on the high-
side). The amplifier outputs are driven to negative full-scale.
• The high-side DC/DC output voltage (DCDC_OUT) or the high-side LDO output voltage (HLDO_OUT) drop
below their respective undervoltage detection thresholds (brown-out). In this case, the low-side may still
receive data from the high-side but the data may not be valid. The amplifier outputs are driven to negative
full-scale.
During normal operation, the DIAG pin is in a high-impedance state. Connect the DIAG pin to a pullup supply
through a resistor or leave open if not used.
www.ti.com
AMC3301-Q1
SBASA73 – JULY 2020
Copyright © 2020 Texas Instruments Incorporated
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