ZHCSQI1A November 2022 – November 2023 TPS92622-Q1
PRODUCTION DATA
- 1
- 1 特性
- 2 應用
- 3 說明
- 4 Pin Configuration and Functions
- 5 Specifications
-
6 Detailed Description
- 6.1 Overview
- 6.2 Functional Block Diagram
- 6.3
Feature Description
- 6.3.1 Power Supply (SUPPLY)
- 6.3.2 Enable and Shutdow(EN)
- 6.3.3 Constant-Current Output and Setting (INx)
- 6.3.4 Thermal Sharing Resistor (OUTx and RESx)
- 6.3.5 PWM Control (PWMx)
- 6.3.6 Supply Control
- 6.3.7 Diagnostics
- 6.3.8 FAULT Bus Output With One-Fails-All-Fail
- 6.3.9 FAULT Table
- 6.3.10 LED Fault Summary
- 6.3.11 IO Pins Inner Connection
- 6.4 Device Functional Modes
- 7 Application and Implementation
- 8 Device and Documentation Support
- 9 Revision History
- 10Mechanical, Packaging, and Orderable Information
封裝選項
機械數(shù)據(jù) (封裝 | 引腳)
散熱焊盤機械數(shù)據(jù) (封裝 | 引腳)
- DRR|12
訂購信息
6.3.7.1 LED Short-to-GND Detection
The TPS92622-Q1 device has LED short-to-GND detection. The LED short-to-GND detection monitors the output voltage when the output current is enabled. After a short-to-GND LED failure is detected, the device turns off the faulty channel and retries automatically, regardless of the state of the PWM input. If the retry mechanism detects the removal of the LED short-to-GND fault, the device resumes to normal operation.
The TPS92622-Q1 monitors both V(OUTx) voltage and V(RESx) voltage of each channel and compares it with the internal reference voltage to detect a short-to-GND failure. If V(OUTx) or V(RESx) voltage falls below V(SG_th_falling) longer than the deglitch time of t(SG_deg), the device asserts the short-to-GND fault and pulls low the FAULT pin. During the deglitching time period, if V(OUTx) and V(RESx) rises above V(SG_th_rising), the timer is reset.
After the TPS92622-Q1 has asserted a short-to-GND fault, the device turns off the faulty output channel and retries automatically with a small current. During retrying, the device sources a small current I(Retry) from SUPPLY to OUT and RES to pull up the LED loads continuously. After auto-retry detects output voltage rising above V(SG_th_rising), it clears the short-to-GND fault and resumes to normal operation. Figure 6-3 illustrates the timing for LED short-circuit detection, protection, retry and recovery.
Figure 6-3 LED Short-to-GND Detection and
Recovery Timing DiagramThe detailed information and value of each time period in Figure 6-3 is described in TIMING section of the Electrical Characteristics.