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Part Number: UCC27712-Q1
I am currently using 3-phase bridge drivers for the IGBTs of the inverter stage of a BLDC motor.
Why should I consider a gate driver to replace the 3-phase bridge driver in my existing solution? What are some performance advantages of the half-bridge gate drivers over my current solution?
Why should I replace 3-phase bridge drivers with half-bridge drivers in automotive AC compressor modules?
High-voltage 3-phase BLDC motors are used to drive the AC compressor in high-voltage HEV/EV. HVAC compressors, which can require 10 kW of power, are second only to traction motors in terms of power consumption.
Figure 1 shows a typical AC compressor module block diagram with IGBTs as the inverter stage to drive the 3-phase BLDC motor. An inverter stage consists of three pairs of high-side and low-side IGBTs configured in half-bridge topology.
Figure 1: Block diagram of an automotive high voltage HVAC compressor module
As shown in Figure 2, designers have the choice of using 3-phase bridge drivers IC’s to drive the IGBT’s of the inverter stage. However, because of their low drive strength of <500 mA, 3-phase bridge driver solutions typically require additional buffers to act as a current booster. This means additional components, which translates into additional cost, system PCB size increase and performance degradation (EMI risks and increased propagation delays) of the overall system as a result of parasitics from a non-ideal PCB layout.
Figure 2: Driving the inverter stage with 3-phase gate drivers
To help minimize switching losses from the IGBTs and reduce EMI for higher system efficiency, designers have the choice of using half-bridge gate drivers to drive each phase of the inverter stage instead. That is, the 3-phase bridge drivers depicted in Figure 2 are increasingly being replaced with half-bridge drivers such as UCC27712-Q1 as shown in Figure 3.
Figure 3: Driving the inverter stage with three half-bridge gate drivers
The following are the reasons for using TI half-bridge drivers to drive the IGBTs:
Table 1 below highlights some of the key performance advantages of the UCC27712-Q1 half-bridge gate driver over some 3-phase bridge drivers.
Peak output current (A)
Rise time (ns)
Fall time (ns)
Prop delay (ns)
Operating temperature range (C)
Down to -65C
Limited to -55C Abs max
SOIC | 8
SOIC | 28
Table 1: Performance advantages of the UCC27712-Q1
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