2

Overview:

A significant advantage provided by the L-Series IPM’s built-

in gate drive and protection circuits is that the entire family outlined

in Table 1 requires only two different interface circuit designs. The

standard interface circuit consists of opto-couplers to transfer control

signals and isolated power supplies to power the IPM’s internal

circuits. The two circuits are similar except that devices in packages

A, B, and C have a common control ground for all three low side

IGBTs. This permits use of a single low side supply so that only four

isolated supplies are required. The Powerex BP7B reference design

is an example of this circuit. The remaining large L-Series IPMs in

package D utilize separate control local shield plane islands on the

low side to minimize ground bounce induced noise.

As a result

these devices require six isolated power supplies. Interface circuit details for these devices are available in the

Powerex BP6A reference design application note.

Isolated DC to DC Converters:

In order to simplify the design and layout of the required control power supplies Powerex has introduced

the VLA106-24151, VLA106-24154 isolated DC to DC converters shown in figure 2. Both DC to DC converters

are designed to operate from a 24V DC supply and produce an isolated 15V DC output. The VLA106-24151

provides up to 100mA and the VLA106-24154 provides up to 300mA for control power.

Both DC to DC

converters use transformers to provide 2500VRMS isolation between the primary and secondary side. The

BP7B board uses three VLA106-24151 DC to DC converters to provide high side control power for the L-Series

IPMs. The low side control power can be supplied by either a VLA106-24151 or VLA106-24154. The higher

current VLA106-24154 is only needed for low side control power on the package C IPMs when the current draw

of the three low side gate drive circuits exceeds 100mA. Table 1 shows the recommended DC to DC converters

for each L-Series IPM.

Part Num be r

Voltage

(V)

Curre nt

(A)

Pack age

Re com m e nde d

DC to DC Conve rte rs

Re fe re nce

De s ign

PM50(#)L(*)060

50

PM75(#)L(*)060

75

PM100(#)L(*)060

100

PM150(#)L(*)060

150

PM200(#)LA060

200

PM300(#)LA060

300

PM450CLA060

450

PM600CLA060

600

PM25(#)L(*)120

25

PM50(#)L(*)120

50

PM75(#)L(*)120

75

PM100(#)LA120

100

PM150(#)LA120

150

PM200CLA120

200

PM300CLA120

300

PM450CLA120

450

VLA106-24151 x 3pc.

VLA106-24154 x 1pc.

VLA106-24151 x 6pc.

VLA106-24151 x 4pc.

VLA106-24151 x 3pc.

VLA106-24154 x 1pc.

VLA106-24151 x 6pc.

VLA106-24151 x 4pc.

600

1200

A or B

C

D

A or B

C

D

BP7B

BP6A

BP7B

BP6A

(*) Package Option: B=Solder pin, A=Screw terminal

(#) Circuit Option: R=Six Pack+Brake, C=Six pack

Example:

PM75RLB120 is a 75A, 1200V six pack with brake in a solder pin package

Table 1: L-Series IPM Line-Up and Interface Circuit Selection

Figure 1: L-Series IPMs

Package A

Package B

Package C

Package D