L6207 datasheet(23/53 Pages) STMICROELECTRONICS

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AN1762 APPLICATION NOTE

3.14 Paralleling two Full Bridges

3.14.1Paralleling two Full Bridges to get a single Full Bridge

The outputs of L6205, L6206, L6207 can be paralleled to increase the output current capability or reduce the

power dissipation in the device at a given current level. It must be noted, however, that the internal wire bond

connections from the die to the power or sense pins of the package must carry current in both of the associated

half bridges (see Figure 24). When the two halves of one full bridge (for example OUT1A and OUT2A) are con-

nected in parallel, the peak current rating is not increased since the total current must still flow through one bond

wire on the power supply or sense pin. In addition, the over current detection senses the sum of the current in

the upper devices of each bridge (A or B) so connecting the two halves of one bridge in parallel does not in-

crease the over current detection threshold.

Figure 24. VS and SENSE pins maximum current handling

This configuration has to be used when two separate loads are driven, since the ICs has only two ENABLE in-

puts, one for the full bridge A and the other for the bridge B. In this case pulling to GND one of the two ENABLE

pins will disable only one load (see Figure 25).

This configuration can also be used if a 5.6A OCD threshold is desired (instead of 11.2A).

Half Bridge 1 and the Half Bridge 2 of the Bridge A are connected in parallel and the same done for the Bridge

B as shown in Figure 25. In this configuration, the peak current for each half bridge is still limited by the bond

wires for the supply and sense pins so the dissipation in the device will be reduced, but the peak current rating

is not increased. Using this configuration with L6206, two separate resistors connected to pins

PROGCLA and

PROGCLB must be used. With L6207, two separate RC network should be used on RC pins. When two different

loads are driven (see Figure 25) by the two equivalent half bridges, two separate sensing resistors are needed,

while if the two equivalent half bridges drive two separate loads, they must be connected from the

OUT pins to

VS (see Figure 25) to make the PWM current control working properly.

In this configuration, the resulting bridge has the following characteristics (typical values).

- Equivalent Device: FULL BRIDGE

- RDS(ON) 0.15Ω Typ. Value @ TJ = 25°C

- 2.8A max RMS Load Current

- 5.6A OCD Threshold

OVER

CURRENT

DETECTION

VSA

OUT2A

SENSEA

BRIDGE A

2.8A rms

5.6A peak

SOURCED:

IOUT1 + IOUT2 = ISUPPLY < 2.8A rms, 5.6A pk.

SOURCED Current

OCD Threshold:

IOUT1+ IOUT2 = 5.6A typ.

OUT1A

SINKED:

IOUT1 + IOUT2 = ISENSE < 2.8A rms, 5.6A pk.

OVER

CURRENT

DETECTION

VSB

OUT2B

SENSEB

BRIDGE B

2.8A rms

5.6A peak

SOURCED:

IOUT1 + IOUT2 = ISUPPLY < 2.8A rms, 5.6A pk.

SOURCED Current

OCD Threshold:

IOUT1+ IOUT2 = 5.6A typ.

OUT1B

VSA

OUT2A

SENSEA

BRIDGE A

2.8A rms

5.6A peak

OUT1A

SINKED:

IOUT1 + IOUT2 = ISENSE < 2.8A rms, 5.6A pk.

VSB

OUT2B

SENSEB

BRIDGE B

2.8A rms

5.6A peak

OUT1B

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