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MCZ33395EWR2 bảng dữ liệu(PDF) 11 Page - Freescale Semiconductor, Inc |
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MCZ33395EWR2 bảng dữ liệu(HTML) 11 Page - Freescale Semiconductor, Inc |
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11 / 16 page  Analog Integrated Circuit Device Data Freescale Semiconductor 11 33395 FUNCTIONAL DESCRIPTION FUNCTIONAL INTERNAL BLOCK DESCRIPTION Figure 5). These gate drive outputs supply the peak currents required to turn ON and hold ON the low-side MOSFETs, as well as turn OFF the MOSFETs. VDD FUSE The VDD supply of the 33395 IC has an internal fuse, which will blow and set all outputs of the device to OFF, if the VDD voltage exceeds that stated in the maximum rating section of the data sheet. When this fuse blows, the device is permanently disabled. ISENS INPUTS The +I sens and -Isens pins are inputs to the internal current sense comparator. In a typical application, these would receive a a low-pass filtered voltage derived from a current sense resistor placed in series with the ground return of the three-phase output bridge. When triggered by the comparator, the CL (current limit) bit of the internal error register is set, and the output gate drive pairs (i.e., GDH1 and GDL1, GDH2 and GDL2, GDH3 and GDL3), are controlled such that current will cease flowing through the load (refer to Table 5, Truth Table, page 12). OVERTEMPERATURE AND OVERVOLTAGE SHUTDOWN CIRCUITS Internal monitoring is provided for both over temperature conditions and over voltage conditions. When any of these conditions presents itself to the IC, the corresponding internally set bits of the error register are set, and the output gate drive pairs (i.e., GDH1 and GDL1, GDH2 and GDL2, GDH3 and GDL3), are controlled such that current will cease flowing through the load (refer to Table 5). LSE AND HSE INPUT CIRCUITS The low-side enable input pins (LSE1, LSE2, LSE3) and high-side enable input pins (HSE1, HSE2, HSE3) form the input pairs (HSE1 and LSE1, HSE2 and LSE2, HSE3 and LSE3) which set the logic states of the output gate drive pairs (i.e., GDH1 and GDL1, GDH2 and GDL2, GDH3 and GDL3) in accordance with the logic set forth in the Truth Table (page 12). Typically these inputs are supplied from an MCU or DSP to provide the phasing of the currents applied to a brushless dc motor's stator coils via the output MOSFET pairs. PWM INPUT The pulse width modulation input provides a single input pin to accomplish PWM modulation of the output pairs in accordance with the states of the Mode 0 and Mode 1 inputs as set forth in the Truth Table (page 12). MODE SELECTION INPUTS The mode selection inputs (Mode 0 and Mode 1) determine the PWM implementation of the output pairs in accordance with the logic set forth in the Truth Table (page 12). PWMing can thus be set to occur either on the high-side MOSFETs or the low-side MOSFETs, or can be set to occur on both the high-side and low-side MOSFETs as "complementary chopping". TEST PIN This pin should be grounded or left floating (i.e., do not connect it to the printed circuit board). It is used by the automated test equipment to verify proper operation of the internal overtemperature shut down circuitry. This pin is susceptible to latch-up and therefore may cause erroneous operation or device failure if connected to external circuitry. |
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Mô tả tương tự - MCZ33395EWR2 |
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