L9788 datasheet(104/264 Pages) STMICROELECTRONICS

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Low-side drivers

L9788

104/264

DS12308 Rev 4

7.6

Low-side driver - LED[1:2]

These 2 LowSide drivers are designed to drive LED Load. They are driven by MSC

command. The Output voltage is clamped to voltage limit by internal clamp circuit.

The pull down diagnostic current of LED driver is configurable by MSC (LEDx_PD_EN

CONFIG_REG1 D3;D4). Overcurrent and Short to Ground diagnostic function are available,

open load diagnostic function is not available when pull down diagnostic current is disabled.

Figure 39. LED LowSide driver stage

Conditions:

5.5 V ≤ VB_IN ≤ 18 V, Tj -40 to 175 °C unless otherwise specified;

PGND

OUTx

LED DRIVER

LOAD

MSC Command

OFF state

OL & STG detection

Driver

ON state

OC & OT protection

Safety BIST control

VBAT

L/R

GADG0212161301PS

Table 49. Low-side driver - LED electrical characteristics

Symbol

Parameter

Test condition

Min

Typ

Max

Unit

LED

LS_RdsON

Low-side

RdsON

Tj = 150 °C, ILOAD = 70 mA

Ω

LED1/2

Tj = 25 °C, ILOAD = 70 mA

Ω

LED1/2

Tj = -40 °C, ILOAD = 70 mA

4.9

Ω

LED1/2

OUTx_lkg

Output leakage

current

Output disabled, diagnostic

off

-10

+10

µA

LED1/2

Irev_OUTx

Body diode

reverse current

voltage drop

ILOAD = -50 mA

LED1/2

SR_ON

Voltage slew

ON state

From 80% to 30% of VOUT

VB_IN = 14 V, Rload = 270 Ω,

V/µs LED1/2

SR_OFF

Voltage slew

OFF state

From 30% to 80%of VOUT

VB_IN = 14 V, Rload = 270 Ω

V/µs LED1/2

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