The TPS92692 and TPS92692-Q1 are high accuracy peak current mode based controllers
designed to support step-up/down LED driver topologies. The device incorporates a rail-to-rail
current amplifier to measure LED current and spread spectrum frequency modulation technique for
improved EMI performance.
This high performance LED controller can independently modulate LED current using either
analog or PWM dimming techniques. Linear analog dimming response with over 15:1 range is obtained
by varying the voltage across the high impedance analog adjust (IADJ) input. PWM dimming of LED
current is achieved by directly modulating the DIM/PWM input pin with the desired duty cycle or by
enabling the internal PWM generator circuit. The PWM generator translates the DC voltage at DIM/PWM
pin to corresponding duty cycle by comparing it to the internal triangle wave generator. The
optional PDRV gate driver output can be used to drive an external P-Channel series MOSFET.
The TPS92692 and TPS92692-Q1 devices support continuous LED status check through the
current monitor (IMON) output. The devices also include an open drain fault indicator output to
indicate LED overcurrent, output overvoltage and output undervoltage conditions.
TPS92692EVM-880 是经过全面组装和测试的 LED 驱动器，可配置为升压或升压到电池拓扑，以为单串串联 LED 供电。它可以使用低偏移轨至轨电流感应放大器及高侧电流感应实施来实现精确的闭环 LED 电流调节。可以使用高阻抗模拟调节 (IADJ) 输入以 15:1 的比率改变直流 LED 电流设置点。可以通过借助所需占空比直接调制 PWM/DIM 输入引脚或通过启用内部 PWM 发生器电路来实现 LED 电流的 PWM 调光。可选 PDRV 栅极驱动器输出可用于驱动外部 P 通道系列 MOSFET。
TPS92692/-Q1 支持通过电流监视器 (IMON) 输出进行连续 LED 状态检查。该器件还包括用于指示 LED 过流、输出过压和输出欠压情况的开漏故障指示器输出。
TIDA-01581 — This reference design is a dual string LED driver that implements an operational amplifier based circuit which balances the current in two LED rings. The operational amplifier circuit senses current in a reference string and uses feedback from a mirrored string to bias a MOSFET that egulates the (...)