L99DZ120 datasheet(78/162 Pages) STMICROELECTRONICS

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Application information

L99DZ120

78/162

DocID029145 Rev 4

4.13

Power outputs OUT1..15 and OUT_HS

The component provides a total of 4 half bridges outputs OUT1, OUT4-6 to drive motors and

10 stand alone high-side outputs OUT7..15 and OUT_HS to drive e.g. LED’s, bulbs or to

supply contacts. All high-side outputs beside OUT_HS and OUT15 are supplied by the pin

VS and OUT_HS and OUT15 are supplied by the buffered supply VSREG. OUT_HS is

intended to be used as contact supply. Beside OUT15 and OUT_HS the high-side switches

can be activated only in case of running charge pump. OUT15 and OUT_HS can be

activated also in standby modes.

All high-side and low-side outputs switch off in case of:



VS (VSREG) overvoltage and undervoltage (depending on configuration, see

Section 4.11.2: VSREG supply failure)



Overcurrent (depending on configuration, auto recovery mode (see below)



Overtemperature (TSD1x/ cluster or single mode)



Fail safe event



Loss of GND at SGND pin

In case of overcurrent or overtemperature (TSD1_CLx (SR 6)) condition, the drivers will

switch off. The relevant status bit will be latched and can be read and optionally cleared by

SPI. The drivers remain off until the status is cleared. In case overvoltage/ undervoltage

condition, the drivers will be switched off. The relevant status bit will be latched and can be

read and optionally cleared by SPI. If VSREG_LOCK_EN (CR 3) respectively

VS_LOCK_EN (CR 3) are set, the drivers remain off until the status is cleared. If the

VS_LOCK_EN or VSREG_LOCK_EN) bit is set to 0, the drivers will switch on automatically

if the error condition disappears. Undervoltage and overvoltage shutdown can be disabled

by SPI. In case of open-load condition, the relevant status register will be latched. The

status can be read and optionally cleared by SPI. The high and low-side outputs are not

switched off in case of open-load condition.

For OUT1, OUT4-8 and OUT_HS the auto recovery feature (OUTx_OCR (CR 7)) can be

enabled; half-bridges and high-side drivers have different Auto recovery frequencies

(frecx_hs and frecx_hb). If these bits are set to 1 the driver will automatically restart from an

overload condition. This overload recovery feature is intended for loads which have an initial

current higher than the overcurrent limit of the output (e.g. Inrush current of cold light bulbs).

The SPI bits OUTx_OCR_ALERT (SR4) indicate that the output reached auto-recovery

condition.

Note:

The maximum voltage and current applied to the high-side Outputs is specified in the

‘Absolute Maximum Ratings’. Appropriate external protection may be required in order to

respect these limits under application conditions. In case of outputs switch off due to loss of

ground at SGND pin, the device has to be re-started through a power off on both VS and

VSREG.

Each of the stand alone high-side driver outputs OUT7 … OUT15 and OUT_HS can be

driven with an internally generated PWM signal, an internal Timer or with DIR1 respectively

DIR2. See Table 48.

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