L9305 datasheet(18/107 Pages) STMICROELECTRONICS

18 / 107 page

Current control drivers

The L9305 provides four independent current control channels. Each channel includes the Driver Control Block,

Analog Current Measurement Block and Output Stage. The Output Stage consists of a driving transistor and the

recirculation transistor and is user configurable for high side or low side control. When configured as a low side

driver, the high side driver recirculates load current. When configured as a high side driver, the low side driver

recirculates load current. Configuration examples are shown in Figure 8 and Section 6: Current control drivers.

Both high and low side paths have independent current sense circuits to ensure accurate current control in either

configuration. The high or low side configuration is selected in register, Channelx_CONFIGURATION1, D[3]. The

device defaults to low side configuration.

Figure 8. HS driver (left) and LS driver (right) configuration

GADG2709181147PS

Calibration and trim data are stored in internal E2PROM memory and are used to optimize current control

performance. Upon power on reset, the device transfers calibration and trim data into local RAM for use in the

Driver Control and Current Measurement blocks. These data are verified using CRC checks, please see

Section 8.4.4 for more details.

Load current can be controlled using the internal closed loop control circuits or directly by the microcontroller as

summarized below.

•

Hardware current control

–

Current Set Point and Switching frequency are programmed through SPI registers

–

Device automatically adjusts the PWM Duty cycle to maintain the programmed load current

•

Software current control

–

Current Set Point and Switching frequency are managed directly by the microcontroller

–

L9305 provides average current feedback through SPI and acts only as load driver

Current control configuration and setup are programmed through the SPI interface. Configuration registers

(Channel_x. CONFIGURATION 1 and Channel_x.CONFIGURATION2) can only be modified when the channel is

not enabled (SOLENDR).

6.1

Hardware current control

Each channel has four operating states, Disabled, Tristate, PWM and Full on. These operating states are

dependent on internal registers settings, SOLENDR register, bit D[7:0] and EN_DR and INxDISx input pins. A

summary of these settings is shown below. Please note the SOLENDR register assigns 2 bits per channel to

select driver operating state, therefore the table below shows only two bits.

L9305

Current control drivers

DS12774 - Rev 10

page 18/107

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