IX21844 Evaluation Board User’s Guide INTEGRATED CIRCUITS DIVISION 1. Introduction IXYS Integrated Circuits Division's IX21844 evaluation board contains all the necessary circuitry to demonstrate the features of a high voltage gate driver configured as a half-bridge driver. IX21844 has dependent high-side and low-side referenced output channels, which are capable of sourcing 1.4A and sinking 1.8A peak current. The floating high-side channel can drive MOSFETs or IGBTs up to 600V from the common reference. The IX21844 features a user-programmable deadtime circuit that can be set with an external resistor. In addition, when a fault or an over-current condition is detected, the device’s shutdown (SD) pin can be used to terminate gate drive to the high-side and low-side switches. 1.1 Features: • • • • • • • • • Floating Channel for Bootstrap Operation up to 600V Programmable Deadtime Outputs Capable of Sourcing 1.4A Peak Current and Sinking 1.8A Peak Current Gate Drive Supply Range: 10V to 20V 3.3V Logic Compatibility Enables Seamless Interface with Micro-Controllers Independent Under-Voltage Lockout (UVLO) Function for Both High-Side and Low-Side Outputs Schmitt-Trigger Inputs at IN and SD Provide Better Noise Immunity High dV/dt Capability: 50V/ns Negative Voltage Transient Protection: -5V IX21844-UG_R01 www.ixysic.com 1 IX21844 Evaluation Board Users Guide INTEGRATED CIRCUITS DIVISION Figure 1. Evaluation Board Layout, Top View Figure 2. Evaluation Board Layout, Bottom View 1.2 Evaluation Board Pin Descriptions Pin Name Description HV VS High Voltage Bus High-Side Floating Supply Return VSS Logic Ground VCC Low-Side and Logic Fixed Supply Voltage SD Logic Input for Shutdown, Active Low Logic Input for High-Side and Low-Side Outputs Low-Side Return Test Point, Low-Side Return IN COM T_COM 1.3 Evaluation Board Bill of Materials 2 Ref. Des. Qty. U1 Q1, Q2 R1, R4 R2, R3, RB D1, D2 DB CVCC, CVSS, CB CVBUS 1 2 2 3 2 1 3 1 Description High-Side and Low-Side Gate Driver Polar HV MOSFET 800V 10A TO-220 RES 47 Ohm 1/8W 5% 0805 SMD RES 4.7 Ohm 1/8W 5% 0805 SMD DIODE Fast Recovery 30V 1A Mini2 DIODE Super Fast 600V 1A CAP CER 0.33F X7R 1206 CAP FILM 0.56F 630VDC Radial Manufacturer IXYS IC Division IXYS YAGEO YAGEO PANASONIC Diodes Inc. TDK Panasonic www.ixysic.com Mfr. P/N IX21844N IXFP10N80P RC0805JR-0747RL RC0805JR-074R7L DB2230400L MURS160-13-F C3216X7R1H334K160AA P12270 R01 IX21844 Evaluation Board Users Guide INTEGRATED CIRCUITS DIVISION 2. Functional Description This demo board features a very inexpensive bootstrap circuit that provides power to the high-side drive channel. It consists of resistor, RB, super fast recovery diode, DB, and capacitor, CB. The bootstrap charging sequence is as follows: When VS (high-side floating supply return) is pulled below VCC or is pulled down to COM by the load, the CB bootstrap capacitor begins to charge through resistor, RB, and diode, DB, from the VCC supply. This charge continues until VS is pulled up to a higher voltage than VCC by the external high-side power MOSFET. VBS (the difference voltage between VB and VS) starts to float, and the bootstrap diode begins to reverse bias and block the high HV voltage. Deadtime vs. R5 6 Deadtime (μs) 5 4 3 2 1 0 0 50 100 R5 (kΩ) 150 200 Provide the necessary voltages to VCC and HV, and refer to the IX21844 datasheet for proper operating conditions. Provide the PWM logic input signal for IN. The IX21844 features a programmable deadtime circuit, which can be set by changing the value of resistor, R5. The graph below shows the value of resistor R5 needed to set the required deadtime. On this evaluation board, R5 is selected as 0, which typically provides a 350nS deadtime. The IX21844 demo board includes diode-resistor networks, D1/R1/R2 and D2/R3/R4, to provide faster gate turn-off times for both the high-side and low-side power MOSFETs. Note: The evaluation board does not have reverse polarity protection. Applying a negative voltage to HV or to VCC may permanently damage the components on the board. In addition, when probing the high-side output, the scope probe GND has to be isolated to prevent shorting the high-side output to GND. Figure 3. Evaluation Board Schematic R2 4.7Ω 1 D1 DB2230400L R1 47Ω IX21844 R5 0Ω CVSS 0.33μF 1 2 3 4 5 6 7 IN SD VSS DT COM LO VCC NC VB HO VS NC NC NC 14 13 12 11 10 9 8 CB 0.33μF 3 DB MURS160-13-F RB 4.7Ω CVcc 0.33μF HV Q1 IXFP10N80P 2 CVBUS 0.56μF 630V VS VCC R3 4.7Ω R4 47Ω Q2 IXFP10N80P 2 1 3 D2 DB2230400L COM T_COM R01 www.ixysic.com 3 IX21844 Evaluation Board Users Guide INTEGRATED CIRCUITS DIVISION 3. Operating Waveforms 3.1 Waveforms 1 • • CH1: IN, CH2: Q1 Gate Signal, CH3: Q2 Gate Signal Waveforms show falling edge of High-Side MOSFET Q1 and rising edge of Low-Side MOSFET Q2. Deadtime: 350ns. 3.2 Waveforms 2 • • 4 CH1: IN, CH2: Q1 Gate Signal, CH3: Q2 Gate Signal Waveforms show rising edge of High-Side MOSFET Q1 and falling edge of Low-Side MOSFET Q2. Deadtime 350nS. www.ixysic.com R01 IX21844 Evaluation Board Users Guide INTEGRATED CIRCUITS DIVISION 3.3 Waveforms 3 • • CH1: IN, CH3: Q2 Gate Signal, CH4: VS Waveforms show input signal at 10 kHz frequency, Low-Side Q2 switching at 14.2V and VS High-Side Floating Supply Return Switching at 300V. For additional information please visit www.ixysic.com IXYS Integrated Circuits Division makes no representations or warranties with respect to the accuracy or completeness of the contents of this publication and reserves the right to make changes to specifications and product descriptions at any time without notice. Neither circuit patent licenses nor indemnity are expressed or implied. Except as set forth in IXYS Integrated Circuits Division’s Standard Terms and Conditions of Sale, IXYS Integrated Circuits Division assumes no liability whatsoever, and disclaims any express or implied warranty, relating to its products including, but not limited to, the implied warranty of merchantability, fitness for a particular purpose, or infringement of any intellectual property right. The products described in this document are not designed, intended, authorized or warranted for use as components in systems intended for surgical implant into the body, or in other applications intended to support or sustain life, or where malfunction of IXYS Integrated Circuits Division’s product may result in direct physical harm, injury, or death to a person or severe property or environmental damage. IXYS Integrated Circuits Division reserves the right to discontinue or make changes to its products at any time without notice. Specification: IX21844-UG_R01 Copyright © 2014, IXYS Integrated Circuits Division All rights reserved. Printed in USA. 3/19/2014 R01 www.ixysic.com 5