ZHCSJM3B April 2019 – January 2020 TPS92613-Q1
PRODUCTION DATA.
- 1 特性
- 2 應用
- 3 說明
- 4 修訂歷史記錄
- 5 Pin Configuration and Functions
- 6 Specifications
- 7 Detailed Description
- 8 Application and Implementation
- 9 Power Supply Recommendations
- 10Layout
- 11器件和文檔支持
- 12機械、封裝和可訂購信息
7.3.2 Constant-Current Driver
The TPS92613-Q1 device is a high-side current driver for driving LEDs. The device controls the output current through regulating the voltage drop on an external high-side current-sense resistor, R(SNS). An integrated error amplifier drives an internal power transistor to maintain the voltage drop on the current-sense resistor R(SNS) to V(CS_REG) and therefore regulates the current output to target value. When the output current is in regulation, the current value can be calculated by using Equation 1.
where
- V(CS_REG) = 98 mV (typical)
When the supply voltage drops below total LED string forward voltage plus required dropout voltage, V(DROPOUT), the TPS92613-Q1 is not able to deliver enough current output as set by the value of R(SNS), and the voltage across the current-sense resistor R(SNS) is less than V(CS_REG).