MIC4607 Evaluation Board 85V, Three-Phase MOSFET Driver with Adaptive Dead-Time, Anti-Shoot-Through and Overcurrent Protection General Description The MIC4607 is an 85V, three-phase MOSFET driver that features active anti-shoot-through and adaptive dead-time control, overcurrent protection, and fast propagation delays. The MIC4607 includes a high-voltage internal diode that charges the high-side gate-drive bootstrap capacitor. Precautions The MIC4607 evaluation board does not have reverse polarity protection. Applying a negative voltage to the VIN (J8) or VDD (J1) terminals can damage the device. To prevent damage to the driver, do not exceed 85V on the VIN terminal or 16V on the VDD terminal. The MIC4607 operates over a wide input voltage supply range (5.5V to 85V). Gate-drive voltage is adjustable and is set by the VDD supply voltage. The EN and FLT/ pins are pulled up to VDD. This can cause damage to an external controller whose supply voltage is less than VDD. If these signals are connected to a device with a supply voltage less than VDD, resistors R2 and R3 should be removed or connected to a suitable pullup voltage to prevent damage to the controller. The MIC4607 uses an adaptive dead-time circuit to improve efficiency and prevent shoot-through in the external high- and low-side MOSFETs. Overcurrent sensing guards against excessive power dissipation and provides protection against short-circuit conditions. Ordering Information Datasheets and support documentation are available on Micrel’s website at: www.micrel.com. Part Number Description MIC4607-1YML EV MIC4607 Evaluation Board HI/LI Input Requirements The MIC4607 evaluation board requires a VIN power supply up to 85V and a VDD supply between 5.5V and 16V. A three-phase motor and microprocessor (µC) to supply the proper gate-drive voltage are also required. MIC4607-2YML EV MIC4607 Evaluation Board PWM Input Evaluation Board Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com September 15, 2015 Revision 1.0 Micrel, Inc. MIC4607 Evaluation Board DLY Pin A capacitor connected to the DLY pin determines the amount of time the gate-drive outputs are latched off before they can be restarted. Getting Started 1. Connect the Input Supply Connect the input supply to the VIN (J8) and ground (J9) terminals. Connect the VDD supply to the VDD (J1) and ground (J2) terminals. Pay careful attention to the polarity and supply voltage range. The delay time can be approximately calculated using the Equation 1: 2. Connect the Input Control Signals A µC-based control system is connected to the xHI and xLI terminals (–1 version) or xPWM terminals (–2 version). All inputs are TTL compatible and referenced to ground. t DLY = CDLY × VDLY + IDLY Eq. 1 Where: 3. Enable the MIC4607 The enable pin (J3) is pulled up to VDD with a 100kΩ resistor. The evaluation board does not require an external enable signal to turn on. The output turns-on when VDD exceeds its UVLO threshold. The output can be turned-off by pulling the EN pin low. If the EN is controlled externally (by the µC, for example), resistor R2 may have to be removed to prevent damage to the µC and a pull-up resistor on the µC board may be necessary. CDLY is the external capacitance on the DLY pin IDLY is the DLY pin current source (0.44µA, typically) VDLY+ is the internal comparator threshold (1.5V, typically) Current Limit (ILIM) The current-limit pins sense voltage across parallel resistors R12 and R14. The peak current-limit threshold can be calculated by: 4. FLT/ The FLT/ pin pulls low during an over-current fault. This pin can be monitored or connected to the µC and is pulled up to VDD. If connected to the µC, pull-up resistor R3 should be removed to prevent damage to the µC. A pull-up resistor on the µC board may be required for proper operation. ILIM _ PK = VILIM + R SNS Eq. 2 Where: Circuit Description VILIM+ is the overcurrent threshold (0.2V, typically) For simple evaluation, the six MOSFETs of the MIC4607 evaluation board can be switched with a pulse generator, but will require a µC or other control device to properly drive a three-phase motor. Refer to the MIC4607 datasheet for detailed operating information. RSNS is the parallel combination of R12 and R14 The evaluation board current limit is: EN, xHI, xLI, and xPWM Inputs The input signals for the three phases can be applied to the MIC4607 through either header JP9 or through the labeled board pins. The enable and inputs are standard TTL threshold compatible and are all referenced to ground. The maximum amplitude must not exceed VDD. ILIM _ PK = 0 .2 V = 8A 0.025Ω Eq. 3 Filter R13/C17 prevents false triggering of the overcurrent circuit due to noise and the effects of the low-side gatedriver currents flowing through the current-sense resistors. The EN pin is pulled up to VDD through a 100kΩ resistor (R2). Pulling the EN pin (J3, JP7) low disables all six driver outputs while leaving the EN pin open – or actively driving it above the EN threshold – enables all outputs. FLT/ Pin The fault (FLT/) pin is pulled up to VDD through R3 and can be monitored at terminal J4 or header JP8. This pin is low during an overcurrent fault. September 15, 2015 2 Revision 1.0 Micrel, Inc. MIC4607 Evaluation Board Low-Side Gate Drivers A 3Ω - 5Ω resistor in series between the low-side driver output and MOSFET gate helps reduce the peak driver current flowing through the current-sense resistor. The value of this resistor can increase or decrease depending upon the current-sense resistor value and MOSFET gate capacitance. The series diode resistor circuit – in parallel with the gate resistor in the low-side drivers – should be used to allow proper operation of the adaptive dead-time circuit. Refer to the MIC4607 datasheet for a description of the active anti-shoot-through feature. High-Side Gate Drivers Resistor locations (R4 – R6) can be used to adjust the high-side MOSFET turn-on and turn-off times. Additionally, resistors R1, R7, and R8 can be used to adjust only the MOSFET’s turn-on time. September 15, 2015 3 Revision 1.0 Micrel, Inc. MIC4607 Evaluation Board Evaluation Board Schematic (MIC4607-1, HI/LI Inputs) MIC4607-1 HI/LI Inputs September 15, 2015 4 Revision 1.0 Micrel, Inc. MIC4607 Evaluation Board Bill of Materials (MIC4607-1, HI/LI Inputs) Item Part Number C1, C8, C9, C11 0805YD106MAT2A C2 06033D105MAT2A Manufacturer (1) AVX AVX (2) Qty. 10µF Ceramic Capacitor, 16V, X5R, Size 0805 4 1µF Ceramic Capacitor, 25V, X5R, Size 0603 1 4.7µF Ceramic Capacitor, 100V, X7S, Size 1210 3 C3, C4, C5 C3225X7S2A475M200AB C6 B41858-C9107-M000 TDK 100µF Aluminum Electrolytic Capacitor, 100V 1 C13 06035C333MAT2A AVX 33nF Ceramic Capacitor, 50V, X7R, Size 0603 1 C17 06035C102MAT2A AVX 1nF Ceramic Capacitor, 50V, X7R, Size 0603 1 Q1, Q2, Q3, Q4, Q5, Q6 AM7414NA Analog (3) Power N-Channel MOSFET, 100V 6 R1, R4, R5, R6, R7, R8, R18, R19, R20 CRCW06030000FRT1 Vishay 0Ω, Size 0603 9 R9, R10, R11 CRCW06034R99FRT1 Vishay 4.99Ω, 1%, Size 0603 3 R13 CRCW06034990FRT1 Vishay 499Ω, 1%, Size 0603 1 R2, R3 CRCW06031003FRT1 Vishay 100kΩ, 1%, Size 0603 2 0.05Ω, 1W, Size 1210 2 3.01Ω, 1%, Size 0603 3 Schottky Diode, 30V, 350mA, SOD-323 3 85V, Three-Phase MOSFET Driver with Adaptive Dead-Time, Anti-Shoot-Through and Overcurrent Protection 1 R12, R14 ERJ-L14KF50MU R15, R16, R17 CRCW06033R01FRT1 TDK Description (4) Panasonic (5) Vishay D1, D2, D3 SD103BWS Diodes, Inc. U1 MIC4607-1YML Micrel, Inc. (6) (7) Notes: 1. AVX: www.avx.com. 2. TDK: www.tdk.com. 3. Analog Power: www.analogpower.com. 4. Vishay: www.vishay.com. 5. Panasonic: www.panasonic.com. 6. Diodes, Inc.: www.diodes.com. 7. Micrel, Inc.: www.micrel.com. September 15, 2015 5 Revision 1.0 Micrel, Inc. MIC4607 Evaluation Board Evaluation Board Schematic (Continued) (MIC4607-2, PWM Inputs) September 15, 2015 6 Revision 1.0 Micrel, Inc. MIC4607 Evaluation Board Bill of Materials (MIC4607-2, PWM Inputs) Item Part Number C1, C8, C9, C11 0805YD106MAT2A C2 06033D105MAT2A Manufacturer (1) AVX AVX (2) Qty. 10µF Ceramic Capacitor, 16V, X5R, Size 0805 4 1µF Ceramic Capacitor, 25V, X5R, Size 0603 1 4.7µF Ceramic Capacitor, 100V, X7S, Size 1210 3 C3, C4, C5 C3225X7S2A475M200AB C6 B41858-C9107-M000 TDK 100µF Aluminum Electrolytic Capacitor, 100V 1 C13 06035C333MAT2A AVX 33nF Ceramic Capacitor, 50V, X7R, Size 0603 1 C17 06035C102MAT2A AVX 1nF Ceramic Capacitor, 50V, X7R, Size 0603 1 Q1, Q2, Q3, Q4, Q5, Q6 AM7414NA Analog (3) Power N-Channel MOSFET, 100V 6 R1, R4, R5, R6, R7, R8, R18, R19, R20 CRCW06030000FRT1 Vishay 0Ω, Size 0603 9 R9, R10, R11 CRCW06034R99FRT1 Vishay 4.99Ω, 1%, Size 0603 3 R13 CRCW06034990FRT1 Vishay 499Ω, 1%, Size 0603 1 R2, R3 CRCW06031003FRT1 Vishay 100kΩ, 1%, Size 0603 2 0.05Ω, 1W, Size 1210 2 3.01Ω, 1%, Size 0603 3 Schottky Diode, 30V, 350mA, SOD-323 3 85V, Three-Phase MOSFET Driver with Adaptive Dead-Time, Anti-Shoot-Through and Overcurrent Protection 1 R12, R14 ERJ-L14KF50MU R15, R16, R17 CRCW06033R01FRT1 TDK Description (4) Panasonic (5) Vishay D1, D2, D3 SD103BWS Diodes, Inc. U1 MIC4607-2YML Micrel, Inc. September 15, 2015 (6) (7) 7 Revision 1.0 Micrel, Inc. MIC4607 Evaluation Board PCB Layout Recommendations Top Layer Bottom Layer September 15, 2015 8 Revision 1.0 Micrel, Inc. MIC4607 Evaluation Board MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com Micrel, Inc. is a leading global manufacturer of IC solutions for the worldwide high-performance linear and power, LAN, and timing & communications markets. The Company’s products include advanced mixed-signal, analog & power semiconductors; high-performance communication, clock management, MEMs-based clock oscillators & crystal-less clock generators, Ethernet switches, and physical layer transceiver ICs. Company customers include leading manufacturers of enterprise, consumer, industrial, mobile, telecommunications, automotive, and computer products. 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