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LP8862-Q1 Datasheet(PDF) 19 Page - Texas Instruments

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Part # LP8862-Q1
Description  High-Performance 2-Channel LED Driver
Download  37 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LP8862-Q1 Datasheet(HTML) 19 Page - Texas Instruments

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STANDBY
POR = 1
VDDIO / EN = 1
BOOST START
SOFT START
ACTIVE
65 ms
50 ms
SHUTDOWN
FAULT RECOVERY
FAULTS:
- VIN_OCP
- VIN_OVP
- VIN_UVLO
- TSD
100 ms
FAULTS
FAULTS
VDDIO / EN = 0
VDDIO / EN = 0
LED OUTPUT
CONFIGURATION
DETECTION
BOOST, LED CURRENT SINKS
AND POWER LINE FET ARE
DISABLED IN FAULT RECOVERY
STATE
FAULT
RECOVERY?
YES
NO
VIN_OCP
VIN_OVP
VIN_UVLO
TSD
LP8862-Q1
www.ti.com
SNVSA75A – NOVEMBER 2015 – REVISED NOVEMBER 2015
7.4 Device Functional Modes
7.4.1 Device States
The LP8862-Q1 enters STANDBY mode when the internal LDO output rises above the power-on reset level,
VLDO > VPOR. In STANDBY mode the device is able to detect the VDDIO/EN signal. When VDDIO/EN is pulled
high, the device powers up. During soft start the external power-line FET is opened gradually to limit inrush
current. Soft start is followed by boost (SEPIC) start, during which time VOUT is ramped to the initial value. After
boost (SEPIC) start LED outputs are sensed to detect grounded outputs. Grounded outputs are disabled and
excluded from the adaptive boost (SEPIC) voltage control loop.
If a fault condition is detected, the LP8862-Q1 enters FAULT_RECOVERY state. In this state power line FET is
switched off and both the boost (SEPIC) and LED current sinks are disabled. Faults that cause the device to
enter FAULT_RECOVERY are shown in Figure 17. When LED open or short is detected, faulty string is disabled
but the device stays in ACTIVE mode.
Figure 17. State Diagram
Copyright © 2015, Texas Instruments Incorporated
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