AN2836 datasheet(32/57 Pages) STMICROELECTRONICS

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Designing an application with L6225, L6226, L6227

AN2836

32/57

Doc ID 15084 Rev 1

Figure 35.

L6226 parallel connection for higher current

This configuration cannot be used with L6227, because of its internal PWM current

controllers that work separately for bridge A and bridge B. Using this configuration with the

L6227 may damage the device.

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

●

Equivalent device: full bridge

●

RDS(on) HS + RDS(on) LS 0.73 Ω typ. value at TJ = 25 °C

●

2.8 A max RMS load current

●

5.6 A OCD threshold

It should be noted that using two separate loads for the two equivalent half bridges the

maximum current cannot be sourced or sinked simultaneously by the two equivalent half

bridges (for example to drive two separate loads), due to the 2.8 A maximum current limit for

the VS and SENSE pins (see Figure 29 and 30). When a single load is driven (see Figure 34

and 35), the RCLA and RCLB resistors connected to the PROGCL pins of L6226 should have

the same value.

4.15.2

Paralleling the four half bridges to get a single half bridge

It is also possible to parallel the four half bridges to obtain a simple half bridge as shown in

Figure 36 and 37.

This configuration cannot be used with L6227, because of its internal PWM current

controllers that work separately for bridge A and bridge B. Using this configuration with the

L6227 may damage the device.

The resulting half bridge has the following characteristics (typical values):

●

Equivalent device: half bridge

●

RDS(on) HS + RDS(on) LS 0.36 Ω typ. value at TJ = 25 °C

●

2.8 A max RMS load current

●

5.6 A OCD threshold

When the L6226 is used in this configuration, RCLA and RCLB resistors connected to

PROGCL pins must have the same value.

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