User Guide for FEBFOD8332 FEBFOD8333 Evaluation Board Input LED Drive, 2.5 A Output Current, IGBT Drive Optocoupler with Desaturation Detection, Isolated Fault Sensing, and Active Miller Clamp Featured Fairchild Products: FOD8332 FOD8333 Direct questions or comments about this evaluation board to: "Worldwide Direct Support" Fairchild Semiconductor.com (c) 2014 Fairchild Semiconductor Corporation FEBFOD833x * Rev. 1.0.0 Table of Contents 1. Overview ................................................................................................................................... 3 1.1. 1.2. Features and Benefits ....................................................................................................... 4 Applications ..................................................................................................................... 5 2. Operations ................................................................................................................................. 6 3. Circuit Schematic ...................................................................................................................... 8 4. Setup and Operation................................................................................................................ 10 5. Test Procedures and Conditions.............................................................................................. 10 6. Scope Shots ............................................................................................................................. 12 7. Conclusion .............................................................................................................................. 14 8. Revision History ..................................................................................................................... 14 (c) 2014 Fairchild Semiconductor Corporation 2 FEBFOD833x * Rev. 1.0.0 This user guide supports the evaluation kit for the FOD8332 and FOD8333. It should be used in conjunction with the FOD8332 and FOD8333 datasheets as well as Fairchild's application notes and technical support team. Please visit Fairchild's website at www.fairchildsemi.com. 1. Overview Fairchild FOD833x smart gate driver optocoupler, an advanced 2.5 A output current IGBT drive optocoupler, offers the critical protection necessary for preventing fault conditions that lead to destructive thermal runaway of IGBTs. Pin-for-pin compatible with current solutions, the FOD833x consists of an integrated gate drive optocoupler featuring low RDS(ON) CMOS transistors to drive the IGBT from rail-to-rail and highspeed isolated feedback circuitry for fault sensing. It is ideally suited for driving fastswitching power IGBTs and MOSFETs. FOD833x herein refers to FOD8332 or FOD8333. The key difference between these two products is the reset mechanism. The FAULT signal is reset when VLED1+ is pulled from LOW to HIGH for FOD8332 or automatically after tDESAT(MUTE) for FOD8333. The FOD833x offers best-in-class noise immunity, resulting from its proprietary Optoplanar(R) coplanar packaging technology. The optoplanar technology ensures safe insulation thickness of more than 0.4 mm in attaining reliable high-voltage isolation, certified by UL1577 and DIN EN/IEC60747-5-5 standards. Figure 1. 3-Dimensional Illustration of the Internal Die Set of Fairchild's Optoplanar(R) Package Construction (c) 2014 Fairchild Semiconductor Corporation 3 FEBFOD833x * Rev. 1.0.0 1.1. Features and Benefits 2.5 A Output Current Driving Capability for Most Medium Power IGBTs High Noise Immunity Characterized by CMR: 35 kV/s at Vcm = 1500 Vpeak 1414 Vpeak Working Insulation Voltage and 8000 Vpeak Transient Isolation Voltage Rating Output Voltage Swing Rail-to-Rail: Low Power Dissipation Soft IGBT Turn-Off High Speed: 250 ns Propagation Delay 3.3 V / 5 V, CMOS/TTL-Compatible Inputs (c) 2014 Fairchild Semiconductor Corporation 4 FEBFOD833x * Rev. 1.0.0 1.2. Applications Motor Drives Industrial Inverters Solar Power Inverters Uninterruptible Power Supplies (UPS) Induction Heating Isolated IGBT Drive Figure 2. FOD8332 and FOD8333 Block Diagram (c) 2014 Fairchild Semiconductor Corporation 5 FEBFOD833x * Rev. 1.0.0 2. Operations The application circuit and the timing diagram illustrate the functional use of the FOD833x between a micro-controller and a three-phase system, as well as the interaction of the internal and external signals. Figure 3. Typical Application Circuit The internal gate driving circuitry of FOD833x can be used with either a single positive power supply, VDD, or a dual positive and negative supply, VDD and VSS. The output driver stage, VO, is made up of a pair of PMOS and NMOS transistors, which facilitates close to rail-to-rail output swing. This allows a tight control of gate voltage during onstate and short-circuit condition. Due to the low RDS(ON) of the MOSFETs, the power dissipation is reduced as compared to bipolar-type driver output stages. The absolute maximum rating of the output peak current, IO(PEAK), is 3 A. FOD833x provides short-circuit protection by means of desaturation-detection circuits that monitor the collector-emitter voltage of the IGBT. When the DESAT voltage increases above the threshold voltage, a short-circuit condition is detected and the driver output stage executes a "soft" IGBT turn-off and is eventually driven low. The soft turnoff feature ensures the safe turn-off of the IGBT under fault conditions. This reduces the voltage spike on the collector of the IGBT. Without this, the IGBT would see a heavy spike on the collector, resulting in a permanent damage to the device when it is turned off immediately. The FAULT open-drain output is triggered active LOW to report a desaturation error to the micro-controller. The FAULT signal is reset when VLED1+ is pulled from LOW to HIGH for FOD8332 or automatically after tDESAT(MUTE) for FOD8333. The DESAT fault detector should be disabled for a short period (blanking time) before the IGBT turns on to allow the collector voltage to fall below the DESAT threshold. This blanking period protects against false trigger of the DESAT while the IGBT is turning on. (c) 2014 Fairchild Semiconductor Corporation 6 FEBFOD833x * Rev. 1.0.0 Figure 4. FOD8332 Timing Diagram Figure 5. FOD8333 Timing Diagram The FOD833x is also designed with an under-voltage detection circuit to prevent the application of insufficient gate voltage to the IGBT. This could be dangerous, as it would drive the IGBT out of saturation and into the linear operation where the losses are very high and the device is quickly overheated. (c) 2014 Fairchild Semiconductor Corporation 7 FEBFOD833x * Rev. 1.0.0 3. Circuit Schematic The FEBFOD833x evaluation board with a booster circuit is designed for the evaluation of FOD833x timing sequence and AC test performance when driving an IGBT power module. It is recommended to be used in conjunction with the datasheet. The FOD833x is designed to perform as a stand-alone, optically coupled, gate driver in most applications. If larger gate drive capability is needed for large IGBT modules or parallel operation, an output booster stage may be added to driver for optimum performance. One possible implementation is by a discrete NPN/PNP totem-pole configuration. These booster transistors should be fast switching and have sufficient current gain to deliver the desired peak output current. Figure 6. Circuit Schematic (c) 2014 Fairchild Semiconductor Corporation 8 FEBFOD833x * Rev. 1.0.0 Figure 6. Photograph of the Board This board consists of a FOD833x component, a non-inverting bipolar (NPN/PNP) totem-pole current buffer, two capacitor loads (10 nF / 51 nF), as well as connectors and test terminals for power supplies and input signals. The FOD833x can be evaluated as a stand-alone gate driver driving a 10 nF capacitor load or FOD833x with the totem-pole current buffer driving a 51 nF capacitor load. (c) 2014 Fairchild Semiconductor Corporation 9 FEBFOD833x * Rev. 1.0.0 4. Setup and Operation The setup requires three power supply sources: VCC on one side of the isolation barrier, VDD (positive supply), and VSS (negative supply) on the other side of the isolation barrier. The input signal is applied at the VLED1+ and the resulting output is used to drive either a 10 nF capacitor load (Cg) or a totem-pole current buffer, which in turn drives a bigger 51 nF capacitor load (C9). Test points located at selected positions (as indicated in the schematics) allow the user to probe out the signals and measure the switching characteristics of the device. 5. Test Procedures and Conditions This section describes the default setup of the FEBFOD833x evaluation board. Please refer to the schematic in Figure 6. 1. Connect the power supplies across the following connector: Across VCC and GND. Set the voltage to 5 V. Across VDD and VE (GND of the power supply). Set the voltage to 15 V. Across VE and VSS (GND of the power supply). Set the voltage to 5 V. This power supply configuration enables VO to swing from -5 V to 15 V. 2. Apply the following signal at VLED1+: 10 kHz, square wave, 50% duty cycle, amplitude = 5 V. 3. Evaluation can be completed with the FOD833x as a standalone gate driver or together with the totem-pole current buffer. The jumper configurations are shown in Table 1 on the next page. 4. If soft turn-off evaluation is required, J11 must be left open, with no shorting jumper installed. This allows the DESAT pin to be charged above DESAT threshold voltage. 5. Scope shots of the signals are shown in the subsequent section, using the board in standalone set up and with the totem-pole current buffer. 6. Additional evaluation is accomplished by changing the jumper configuration. For example, the board can be configured to positive gate drive (VO > 0 V), only requiring one power supply source at each side of the isolation barrier. The DESAT threshold voltage (seen at TP7) and the blanking time, can also be varied using jumper J8 and by soldering additional capacitor on the C6 pads. 7. The test points and their corresponding signals are listed in Table 2. (c) 2014 Fairchild Semiconductor Corporation 10 FEBFOD833x * Rev. 1.0.0 T able 1. EVB Jumper Configurations Configuration J1 J4 (1) J2 J3 J5 J6 J7 VO Swing = -5 V to 15 V; FOD833x Standalone X X Vo Swing = -5 V to 15 V; FOD833x and Totem-Pole X X X X X Vo swing = -5 V to 15 V; FOD833x and Totem-Pole (for Soft Turn-off Evaluation) X X X X X Vo swing = -5 V to 15 V; FOD833x Standalone (for Soft Turn-off Evaluation) X X J8 J9 J10 J11 J12 J13 J14 J15 X X Note: 1. X = Jumper short, blank = jumper open. T able 2. Test Points Test Points Description TPI FAULT, Fault-Sense Output TP2 VCC, Positive Supply Voltage (3 V to 15 V for Fault-Sense Optocoupler TP3 GND, Ground for FAULT-Sense Optocoupler TP4 VLED1+, LED1 Anode TP5 VLED1+, LED1 Cathode; must be connected to ground. TP6 /6A /6B VE, Output Supply Voltage/IGBT Emitter TP7 DESAT, Desaturation Voltage Input TP8 VDD, Positive Output Supply Voltage TP9 VO, Gate Drive Output Voltage TP10 VO2, Totem Pole Current Buffer Output Voltage TP11 VSS, Negative Output Supply Voltage (c) 2014 Fairchild Semiconductor Corporation 11 FEBFOD833x * Rev. 1.0.0 6. Scope Shots Figure 7. FOD833x without Totem-Pole Current Buffer - VLED1+ and VO1 Waveform Figure 8. FOD833x without Totem-Pole Current Buffer - VLED1+ and VO1 Waveform During Soft Turn-Off (c) 2014 Fairchild Semiconductor Corporation 12 FEBFOD833x * Rev. 1.0.0 Figure 9. FOD833x with Totem-Pole Current Buffer - VLED1+, VO1 and VO2 Waveform Figure 10. FOD833x with Totem-Pole Current Buffer - VLED1+, VO1 and VO2 Waveform During Soft Turn-Off (c) 2014 Fairchild Semiconductor Corporation 13 FEBFOD833x * Rev. 1.0.0 7. Conclusion The FEBFOD833x evaluation board allows the user to quickly evaluate the performance of the Fairchild FOD833x smart gate driver optocoupler. Measurement results clearly demonstrate the AC performance and critical protection features of the product that are needed during IGBT fault conditions. With proper booster circuit design, the gate drive capability can be enhanced without affecting key features, such as desaturation detection and soft turn-off timings. 8. Revision History Rev. Date Description 1.0.0 July 2014 Initial Release WARNING AND DISCLAIMER Replace components on the Evaluation Board only with those parts shown on the parts list (or Bill of Materials) in the Users' Guide. Contact an authorized Fairchild representative with any questions. 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