MIC4605 Evaluation Board 85V Half-Bridge MOSFET Drivers with Adaptive Dead Time and Shoot-Through Protection General Description Getting Started The MIC4605 is an 85V half-bridge MOSFET driver that 1. Connect VIN supply between the VIN and GND features adaptive-dead-time and shoot-through protection. terminals and VDD supply between the VDD and The adaptive-dead-time circuitry actively monitors the half- GND terminals. bridge outputs to minimize the time between high-side and Connect a supply between the VIN terminal (J2) and low-side MOSFET transitions, thus maximizing power the GND terminal (J3), paying careful attention to efficiency. Anti-shoot-through circuitry prevents erroneous polarity and supply range (VIN 85V). Do not apply inputs and noise from turning both MOSFETs on at the power until Step 5. same time. Additionally, the MIC4605s adjustable gate Connect a supply between the VDD terminal (J1) and drive sets the gate drive voltage to VDD for optimal the GND terminal (J3), paying careful attention to MOSFET R , which minimizes power loss due to the DS(ON) polarity and supply range (5.5V VDD < 16V). Do not MOSFETs R . DS(ON) apply power until Step 5. Requirements 2. Connect the TTL-compatible HI and LI inputs ( 1), At a minimum, the evaluation board requires a 5.5V to 16V or the PWM single input ( 2). power supply to power the VDD terminal (J1) of the MIC4605 and another supply (up to 85V) may be used to Connect the HI input (JP2) and LI input (JP3) to a power the MOSFETs connected to the VIN terminal (J2). A pulse generator or the output of a PWM control IC. pulse generator or the output of a PWM control IC may be Ensure that they are non-overlapping signals and are TTL compatible logic-levels. The PWM single input connected to the HI and LI terminals ( 1), or PWM single replaces the HI input (JP2) for the 2 option. input ( 2). Precautions 3. Monitor inputs and outputs. Monitor the inputs HI (JP2) and LI (JP3) or PWM (JP2) There is no reverse input protection on this board. When connecting the input sources, make sure that the correct and outputs HO (JP1) and LO (JP4) with an oscilloscope. polarity is observed. Under extreme load conditions and with a high supply 4. Connect motor across HS and GND or connect HS to GND. voltage (>48V) connected to the VIN terminal (J2), input transients can be quite large if long test leads are used. In The simplest way to observe the MIC4605 operation is such cases a 100F, 100V electrolytic capacitor is needed to connect a motor across the HS terminal (J8) and across the VIN terminals to prevent overvoltage damage to GND (J9). Alternatively the HS terminal (J8) can be the IC. This can be removed if a clean supply voltage on shorted to GND (J9) with the VIN supply turned OFF. VIN is always guaranteed. DC and AC parameters can be easily measured in this configuration. Datasheets and support documentation are available on . Micrels web site at: www.micrel.com 5. Turn-on supplies and HI/LI inputs. Turn-on the VDD power supply, followed by the VIN power supply. Turn on the HI and LI inputs ( 1) or PWM single input ( 2). Micrel Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel +1 (408) 944-0800 fax + 1 (408) 474-1000 Micrel, Inc. MIC4605 Evaluation Board Ordering Information Part Number Description MIC4605-1YMT EV Evaluation Board Featuring the MIC4605-1YMT Half-Bridge MOSFET Driver with Dual-TTL Inputs MIC4605-2YMT EV Evaluation Board Featuring the MIC4605-2YMT Half-Bridge MOSFET Driver with Dual-TTL Inputs MIC4605-1YM EV Evaluation Board Featuring the MIC4605-1YM Half-Bridge MOSFET Driver with Single-PWM Input MIC4605-2YM EV Evaluation Board Featuring the MIC4605-2YM Half-Bridge MOSFET Driver with Single-PWM Input Evaluation Board Performance Revision 1.0 November 18, 2013 2