TI TPS92692高精度峰值电流模式LED驱动方案

TI公司的TPS92692和TPS92692-Q1是基于高精度峰值电流模式LED控制器,可配置成降压/升压模式,输入电压4.5V-65V,在–40°C 到 150°C结温下LED电流精度优于± 4%,采用扩频调制以改善EMI,调光范围1000:1,主要用在汽车外部照明,驱动器监视系统(DMS),LED通用照明,安全出口标记和应急照明.本文介绍了TPS92692主要特性,功能框图以及应用电路,评估板TPS92692EVM-880主要特性和连接图,升压配置电指标,电路图,材料清单和PCB装配图与设计图.
The TPS92692 and TPS92692-Q1 are high accuracypeak current mode based controllers designed tosupport step-up/down LED driver topologies. Thedevice incorporates a rail-to-rail current amplifier tomeasure LED current and spread spectrum frequencymodulation technique for improved EMI performance.
This high performance LED controller canindependently modulate LED current using eitheranalog or PWM dimming techniques. Linear analogdimming response with over 15:1 range is obtainedby varying the voltage across the high impedanceanalog adjust (IADJ) input. PWM dimming of LEDcurrent is achieved by directly modulating theDIM/PWM input pin with the desired duty cycle or byenabling the internal PWM generator circuit. ThePWM generator translates the DC voltage atDIM/PWM pin to corresponding duty cycle bycomparing it to the internal triangle wave generator.The optional PDRV gate driver output can be used todrive an external P-Channel series MOSFET.
The TPS92692 and TPS92692-Q1 devices supportcontinuous LED status check through the currentmonitor (IMON) output. The devices also include anopen drain fault indicator output to indicate LEDovercurrent, output overvoltage and outputundervoltage conditions.
TPS92692主要特性:
• Wide Input Voltage: 4.5 V to 65 V
• Better than ± 4% LED Current Accuracy over–40℃ to 150℃ Junction Temperature Range
• Spread Spectrum Frequency Modulation forImproved EMI
• Comprehensive Fault Protection Circuitry withCurrent Monitor output and Open Drain Fault FlagIndicator
• Internal Analog Volt...