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MCT8316Z Datasheet(PDF) 39 Page - Texas Instruments |
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MCT8316Z Datasheet(HTML) 39 Page - Texas Instruments |
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39 / 100 page  8.3.11 Active Demagnetization MCT8316Z-Q1 family of devices has smart rectification features (active demagnetization) which decreases power losses in the device by reducing diode conduction losses. When this feature is enabled, the device automatically turns ON the corresponding MOSFET whenever it detects diode conduction. This feature can be configured with the MODE pins in hardware variants. In SPI device variants this can be configured through EN_ASR and EN_AAR bits. The smart rectification is classified into two categories of automatic synchronous rectification (ASR) mode and automatic asynchronous rectification (AAR) mode which are described in sections below. Note In SPI device variants both bits, EN_ASR and EN_AAR needs to set to 1 to enable active demagnetization. The MCT8316Z-Q1 device includes a high-side (AD_HS) and low-side (AD_LS) comparator which detects the negative flow of current in the device on each half-bridge. The AD_HS comparator compares the sense-FET output with the supply voltage (VM) threshold, whereas the AD_LS comparator compares with the ground (0-V) threshold. Depending upon the flow of current from OUTx to VM or PGND to OUTx, the AD_HS or the AD_LS comparator trips. This comparator provides a reference point for the operation of active demagnetization feature. VM PGND OUTX Sense FET GAIN SOX VREF I/V Converter Sense FET + - 0V (GND) + - VM AD_HS Comparator AD_LS Comparator (To Digital) (To Digital) Figure 8-29. Active Demagnetization Operation Table 8-7 shows the configuration of ASR and AAR mode in theMCT8316Z-Q1 device. Table 8-7. PWM_MODE Configuration MODE Type MODE Pin (Hardware Variant) ASR and AAR configuration Hall Configuration Modulation ASR and AAR Mode Mode 1 Connected to AGND EN_ASR = 0, EN_AAR = 0 Analog Hall Input Asynchronous ASR and AAR Disabled Mode 2 Connected to AGND with RMODE1 EN_ASR = 0, EN_AAR = 0 Digital Hall Input Asynchronous ASR and AAR Disabled Mode 3 Connected to AGND with RMODE2 EN_ASR = 0, EN_AAR = 0 Analog Hall Input Synchronous ASR and AAR Disabled Mode 4 Hi-Z EN_ASR = 0, EN_AAR = 0 Digital Hall Input Synchronous ASR and AAR Disabled Mode 5 Connected to AVDD with RMODE2 EN_ASR = 1, EN_AAR = 1 Analog Hall Input Synchronous ASR and AAR Enabled www.ti.com MCT8316Z-Q1 SLVSGO3 – DECEMBER 2021 Copyright © 2021 Texas Instruments Incorporated Submit Document Feedback 39 Product Folder Links: MCT8316Z-Q1 |
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