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TLE9185QXV33 Datasheet(PDF) 49 Page - Infineon Technologies AG |
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TLE9185QXV33 Datasheet(HTML) 49 Page - Infineon Technologies AG |
49 / 192 page ![]() Datasheet 49 Rev. 1.0 2021-01-21 TLE9185QXV33 BLDC Driver Gate Drivers 9.3 PWM operation The half-bridge can be controlled in PWM using either three or six PWM inputs. The TLE9185QXV33 offers the possibility to detect the active and the freewheeling (FW) MOSFET in each half- bridge. 9.3.1 Determination of the active and freewheeling MOSFET If EN_GEN_CHECK = 1, right before each MOSFET activation, the device detects which MOSFET of the half- bridge is the active MOSFET and which MOSFET is the free-wheeling (FW) MOSFET: • If VSHx > VS - VSHH: The high-side MOSFET is the FW MOSFET and the low-side MOSFET is the active MOSFET. • If VSHx < VSHL: Then the low-side MOSFET is the FW MOSFET and the high-side MOSFET is the active MOSFET. • If VSHL < VSHx < VSHH: No clear distinction between the active FW MOSFET and the active MOSFET. The next MOSFET to be turned on is turned on as if it was the active MOSFET. If EN_GEN_CHECK = 0, the detection of the active and FW MOSFET is disabled. The PWM MOSFET is considered as the active MOSFET. Figure 26 shows the detection of the active and of the FW MOSFET. Figure 26 Detection of the active and FW MOSFET - Principle 9.3.2 Configurations in PWM mode The following sections describe the different control schemes in PWM mode. SL GLx SHx GHx VS VCP VCP High-Speed Comparators Lowside Gate-Driver Highside Gate-Driver VSHH VSHL HS and LS off Freewheeling through high-side MOSFET body diode VSHx > VSHH HS = FW MOSFET LS = Active MOSFET HS and LS are off Freewheeling through low-side MOSFET body diode VSHx < VSHL LS = FW MOSFET HS = Active MOSFET SL GLx SHx GHx VS VCP VCP High-Speed Comparators Lowside Gate-Driver Highside Gate-Driver VSHH VSHL |
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