AUIRS2336S【PDF 25/37 页】IC GATE DRIVER HV 3PHASE 28SOIC

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AUIRS2336S

Bootstrap Power Supply Design

For information related to the design of a standard bootstrap power supply (i.e., using an external discrete diode)

please refer to Design Tip 04-4 (DT04-4) entitled “Using Monolithic High Voltage Gate Drivers.” This design tip is

available at www.irf.com .

Separate Logic and Power Grounds

The AUIRS2336S has separate logic and power ground pin (V SS and COM respectively) to eliminate some of the

noise problems that can occur in power conversion applications. Current sensing shunts are commonly used in

many applications for power inverter protection (i.e., over-current protection), and in the case of motor drive

applications, for motor current measurements. In these situations, it is often beneficial to separate the logic and

power grounds.

Figure 24 shows a HVIC with separate V SS and COM pins and how these two grounds are used in the system. The

V SS is used as the reference point for the logic and over-current circuitry; V X in the figure is the voltage between the

ITRIP pin and the V SS pin. Alternatively, the COM pin is the reference point for the low-side gate drive circuitry. The

output voltage used to drive the low-side gate is V LO -COM; the gate-emitter voltage (V GE ) of the low-side switch is the

output voltage of the driver minus the drop across R G,LO .

DC+ BUS

D BS

V CC

V B

(x3)

HO

(x3)

V S

C BS

R G,HO

(x3)

V S1

V S2

V S3

LO

ITRIP

(x3)

R G,LO

+

+

+

V SS

COM

V GE1

-

V GE2

-

V GE3

-

R 2

R 0

+

V X

R 1

-

DC- BUS

Figure 24: Separate V SS and COM pins

Tolerant to Negative V S Transients

A common problem in today’s high-power switching converters is the transient response of the switch node’s voltage

as the power switches transition on and off quickly while carrying a large current. A typical 3-phase inverter circuit is

shown in Figure 25; here we define the power switches and diodes of the inverter.

If the high-side switch (e.g., the IGBT Q1 in Figures 26 and 27) switches off, while the U phase current is flowing to

an inductive load, a current commutation occurs from high-side switch (Q1) to the diode (D2) in parallel with the low-

side switch of the same inverter leg. At the same instance, the voltage node V S1 , swings from the positive DC bus

voltage to the negative DC bus voltage.

www.irf.com

25

? 2009 International Rectifier

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