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參數(shù)資料
| 型號： | L99PM62XP |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 電源管理 |
| 英文描述： | 4-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO36 |
| 封裝： | ROHS COMPLIANT, POWERSSO-36 |
| 文件頁數(shù)： | 31/98頁 |
| 文件大?。?/td> | 1117K |
| 代理商： | L99PM62XP |
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L99PM62XP
Protection and diagnosis
Doc ID 16363 Rev 2
3.3
High-side driver outputs
The component provides a total of 4 high-side outputs Out1 to 4, (7
Ω typ. at @ 25°C) to
drive e.g. LED's or hall sensors and 1 high-side output OUT_HS with 1
Ω typ. at @ 25 °C).
The high-side outputs switch off in case of:
●
Vs over and undervoltage
●
Over current
●
Overtemperature with pre warning(a)
In case of overload or over temperature (TSD1) condition, the drivers switchs off. The
according status bit is latched and can be read and optionally cleared by SPI. The drivers
remain off until the status is cleared.
In case over/under voltage condition, the drivers is switched off. The according status bit is
latched and can be read and optionally cleared by SPI. If the Vlockout bit (Control Register
4) is set to ‘1’ the drivers remain off until the status is cleared. If the Vlockout bit is set to ‘0’
the drivers switches on automatically if the error condition disappears.
In case of open-load condition, the according status register is latched. The status can be
read and optionally cleared by SPI. The high-sides not switches off.
For OUT_HS the auto recovery feature (OUTHSREC bit Control Register 4) can be enabled.
If this bit is set to ‘1’ the driver is automatically restart from a overload condition. This
overload recovery feature is intended for loads which have an initial current higher than the
over current limit of the output (e.g. Inrush current of cold light bulbs). During auto recovery
mode the over current status bit can not be read from SPI.
The device itself can not distinguish between a real overload and a non linear load like a
light bulb. A real overload condition can only be qualified by time. As an example, the micro
controller can switch on light bulbs by setting the over current recovery bit for the first 50ms.
After clearing the recovery bit, the output is automatically disabled if the overload condition
still exists.
In case of a fail safe condition, the high-side drivers are switched off. The control bits are set
to default values. (except OUT3/FSO if it is used as a high-side driver output)
Note:
The maximum voltage and current applied to the high-side outputs is specified in
Section 2.1: Voltage regulators. Appropriate external protection may be required in order to
respect these limits under application conditions.
3.4
Low-side driver outputs REL1, REL2
The outputs REL1, REL2 (RDSon = 2 Ω typ. @25 °C) are specially designed to drive relay
loads.
The outputs provide an active output zener clamping (45 V typ.) feature for the
demagnetization of the relay coil, even though a load dump condition exists.
For fail-safe reasons the relay drivers are linked with the fail safe operation: in case of
entering the fail safe mode, the relay drivers switchs off and the SPI control bits are set to
default (i.e. driver is off).
a.
Except OUT3 when configured as FSO.
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