IRS26320JPBF

IRS26320JPbF – High-Voltage 3-Phase Gate Driver IC with DC Bus Over-voltage Protection and Emergency Supply Backup IRS26320JPbF Functional Block Diagram DC Bus Sense Comparator Input and Filter DC+ bus Schmitt-Trigger Inputs, Noise Filter and Shoot-through Protection IRS26320JPbF VSS DCbusSense Emergency Supply VCC Backup VCC Logic Summary Backup Bias Supply HV Well VCC VB: High-Side Power Supply (x3) Low-Side Input (x3) High-Side Output (x3) Logic HV Level Shifters VS: High-Side Return (x3) To High-Side Power Switches (x3) ITRIP COM VSS Topology 3-Phase VOFFSET ≤ 600V VOUT 12V - 20V IO & IO- (typical) 200mA & 350mA tON & tOFF (typical) 530ns & 530ns Deadtime (typical) 290ns Package 44-lead PLCC To Low-Side Power Switches (x3) • Gate drive supplies up to 20 V per channel • Over-current protection LV Drive Stage • Over-temperature shutdown input • Advanced input filter General Purpose Comparator Input & Filter • Integrated deadtime protection • Shoot-through (cross-conduction) protection • Under-voltage lockout for VCC and VBS • Enable/disable input and fault reporting IRS26320JPbF Typical Application Connection + • Adjustable fault clear timing DCBUS • Separate logic and power grounds • 3.3V input logic compatible Input Voltage • Tolerant to repetitive negative Vs transient voltage To Load DCBUS Sense • Designed for use with bootstrap power supplies • Matched propagation delays for all channels LO 1,2,3 COM Typical Applications IRS26320J Vss Higher Efficiency Modern washer manufacturers require state-of-the-art electronic components to deliver more sophisticated features to the end user. The aim is to create a machine that can wash almost all types of fabric with minimum energy, in less time and using less detergent than previous models – without increasing the overall system cost. Furthermore, government regulations are becoming more and more stringent in terms of efficiency and safety. In the near future, a new energy labeling scheme may be introduced in Europe – and the only way to achieve the highest class label will be to equip the washer with a three-phase permanent magnet (PM) motor. The IRS26320JPbF from International Rectifier is a high-voltage, high speed power MOSFET and IGBT driver with three independent high- and low-side referenced output channels for three-phase inverters driving PM motors in washers. The motor is enabled to deliver high torque at low speed (during washing) and reach high speed with low torque demand (during spinning). This highly accurate torque and speed control delivers an efficient washing cycle while reducing the motor flux to enable a high spinning speed that helps deliver a more efficient drying function in compliance with safety regulations. Drum Torque 30Nm • RoHS compliant DCBUS To Load IRS26320JPbF GND • -40˚C to 125˚C operating range • Permanent magnet motor drives for appliances 5Nm Two extreme point control Field weakening operation (Reduce flux to keep voltage from saturation) Spin: Low torque high speed 1800rpm • Industrial drives Speed • Micro inverter drives Control Inputs, EN For further information please contact your local Farnell office or visit the web at: www.farnell.com DC Bus+ VB1,2,3 1,2,3 VS1,2,3 DCBusSense RCIN ITRIP VSS Wash cycle: High torque low speed – VCC Vcc HIN1,2,3 LIN1,2,3 FAULT/EN • Emergency supply backup in case of VCC loss • DC bus sensing with over-voltage protection IC detects overcurrent and performs shutdown Up to 600V Vcc HIN1,2,3 LIN1,2,3 FAULT/EN • Drives up to six IGBT/MOSFET power devices Low-Side Output (x3) Delay Typical Connection Diagram Features HV Drive Stage RCIN High-Voltage 3-Phase Gate Driver IC with DC Bus Over-Voltage Protection and Emergency Supply Backup THE POWER MANAGEMENT LEADER 600V 3-Phase Gate Drive IC with UVLO Protection High-Side Input (x3) FAULT/EN HVIC / MOTOR CONTROL 10208FS For further information please contact your local Farnell office or visit the web at: www.farnell.com 10208FS IRS26320JPbF – High-Voltage 3-Phase Gate Driver IC with DC Bus Over-voltage Protection and Emergency Supply Backup DC + BUS Control is lost: DCBUS voltage rises quickly due to voltage regeneration. DBS VB (x3) CBS HO (x3) VBUS > VTH, BUS DCBUS Sense LO (x3) 100 200 300 400 Time (ns) 500 600 700 800 900 1000 0 RG, HO OFF VS (x3) ITRIP 0 OFF VS1 -10 OFF VS2 RG, LO ON ON ON Tested safe operating area IRS26320 -20 IRS26320JPbF brakes the motor by shorting the motor terminal and avoiding excessive over-voltage VS3 -30 VI (V) VCC COM VSS -40 -50 -60 Phase Current -70 RSHUNT IRS26320JPbF Safe Operating Area under repetitive negative spikes -80 -90 DC – BUS DC Bus over-voltage protection scheme in IRS26302J Washers equipped with PM motors present a new challenge to washer manufacturers, because, while in spinning mode, the motor itself can become dangerous in the event that control is lost. To reach the necessary high speed during spinning, the motor must be de-fluxed in real-time fashion. This artificial de-fluxing prevents the motor from generating a significant voltage. Problems arise if, in the event of controller failure, the motor is left rotating without controlling the applied voltage to it. The motor will then act as a dynamo, generating a high voltage (above 1000V) that can create a fire hazard in the electronics. The IRS26320JPbF from International Rectifier has been designed with a specific hardware safety function that can override the controller commands and brake the PM motor (by shorting its terminals) until a safe low speed is reached, thus avoiding high-voltage generation. The IRS26320JPbF continuously senses the DC Bus through an external resistor divider and, if a critical voltage is reached, the IRS26320JPbF successfully brakes the motor by shorting the terminal through low-side switches. Increased Reliability The IRS26320JPbF from International Rectifier is part of the company’s latest family of gate drivers designed to be the most rugged in the market for hard switching environments such as motor control circuits. A typical problem in voltage source inverters with inductive loads (as in the motor control domain) is that the hard switching generates negative voltage spikes whose amplitude and duration depend on the switches and on the layout of the application PCB. Each of these spikes occurs at PWM frequency, so in some operating conditions, they can occur 16000 times per second. In the IRS26320JPbF datasheet, the Safe Operating Area for this HVIC under these conditions is specified. +VBUS LD2 HO VBUS Q2 VS Undershoot Control IC LS2 VS Overall Benefits • Reduced component count because the high-voltage clamping diodes used in other solutions are no longer necessary • Fewer field returns because the robust IR HVIC does not fail in an unpredictable manner unlike other solutions Input filters have been re-designed to avoid small pulse commands reaching the gates of the switches in the inverter. This is one of the sources of problems in the field and usually it is difficult to detect. The typical effect is that sometimes inverters return from the field damaged with one destroyed leg without an apparent root cause. The IRS26320JPbF embeds filters that solve this issue. tFIL,IN IN While including all features in the design of the new rugged family of motion gate drivers, International Rectifier considered the overall system cost requirements of its customers. Therefore, the IRS26320JPbF includes many features that are required in modern applications while keeping external component count to a minimum. With fewer components and field returns, the overall system cost is lower. tFIL,IN OUT Small pulses to the gate of the switches may cause inverter damage tFIL,IN IN IN OUT tFIL,IN OUT To Load LO Q1 -VS LS1 Load Return Tolerant to negative transient voltage IRS26320 HVIC COMPETITOR’S HVIC VS -COM COM Cost-effectiveness IN OUT LD1 Competing solutions require an added external circuit to perform the same function as the IRS26320JPbF. This function is mandatory because it is required for safety purposes. Another important feature of the IRS26320JPbF is an emergency supply backup in case of Vcc loss. If the application power supply fails during field weakening operation, the Vcc may disappear In addition to improved filtering techniques, the IRS26320PbF also guarantees outstanding matching in propagation time on all channels as well as dead-time automatically inserted when external dead-time is lower than a minimum safe limit. Advanced Input Filtering in IRS26320J EXAMPLE 1 Safety regulations enforced by law require that every appliance must meet precise international rules. Every appliance must include safety protection circuits either in hardware or in software that avoid hazards to the end user in case of failure of any of the components in the machine. By law, every circuit that implements a protective function must be certified by an internationally recognized institute. leaving the inverter totally uncontrolled. This can be a serious fire hazard. The IRS26320JPbF includes a unique emergency backup circuitry that can self-bias the HVIC from the DC Bus and engage a Zero Vector Brake function to coast stop the motor safely. The IRS26320JPbF also embeds other important protection features that are used for safety reasons: anti-shoot through, over-current protection, under-voltage lockout and thermal shutdown input. EXAMPLE 2 Greater Safety t MT TON, TOFF matching time (on all six channels) 50ns Max MDT DT matching (HIN ->LO & LO->HIN on all channels) 60ns Max PM Pulse width distortion 75ns Max Outstanding deadtime and delay matching in IRS26320J along with low pulse width distortion