TPS61196
- 8-V to 30-V Input Voltage
- Up to 120-V Output Voltage
- 100-KHz to 800-kHz Programmable Switching
Frequency - Adaptive Boost Output for LED Voltages
- Six Current Sinks, 200-mA Continuous Output,
400-mA Pulse Output for Each String - ±1.5% Current Matching Between Strings
- High Precision PWM Dimming Resolution up to
5000:1 - Programmable Overvoltage Threshold at Output
and Each Current Sink - Programmable Undervoltage Threshold at Input
with Adjustable Hysteresis - Adjustable Soft Start Time Independent of
Dimming Duty Cycle - Built-in LED Open and LED Short Protection
- Built-in Schottky Diode Open/Short Protection
- Built-in ISET Short Protection
- Built-in IFB Short Protection
- Thermal Shutdown
The TPS61196 provides a highly integrated solution for LCD TV backlight with an independent PWM dimming function for each string. This device is a current mode boost controller driving up to six WLED strings with multiple LEDs in series. Each string has an independent current regulator providing a LED current adjustable from 50 mA to 400 mA within ±1.5% matching accuracy. The minimal voltage at the current sink is programmable in the range of 0.3 V to 1 V to fit with different LED current settings. The input voltage range for the device is from 8 V to 30 V.
The device adjusts the boost controller'’s output voltage automatically to provide only the voltage required by the LED string with the largest forward voltage drop plus the minimum required voltage at that string's IFB pin, thereby optimizing driver efficiency. Its switching frequency is programmed by an external resistor from 100 kHz to 800 kHz.
The TPS61196 supports direct PWM brightness dimming. Each string has an independent PWM control input. During the PWM dimming, the LED current is turned on or turned off at the frequency and duty cycle which are determined by the external PWM signal. The PWM frequency ranges from 90 Hz to 22 kHz.
The device integrates overcurrent protection, output short-circuit protection, ISET short-to-ground protection, diode open and short protection, LED open and short protection, and overtemperature shutdown circuit. In addition, the TPS61196 can detect the IFB pin short to ground to protect the LED string. The device also provides programmable input undervoltage lockout threshold and output overvoltage protection threshold.
The TPS61196 has a built-in linear regulator which steps down the input voltage to the VDD voltage for powering the internal circuitry. An soft-start circuit is implemented internally to work with an external capacitor to adjust the soft start-up time to minimize the in-rush current during boost converter start-up. The device is available in a 28-pin HTSSOP package with PowerPAD.
技術文件
| 重要文件 | 類型 | 標題 | 格式選項 | 下載最新的英文版本 | 日期 | |
|---|---|---|---|---|---|---|
| * | 資料表 | TPS61196 6-String 400-mA WLED Driver with Independent PWM Dimming for Each String datasheet (Rev. D) | PDF | HTML | 2015/5/1 | ||
| 白皮書 | Common LED Functions and LED Driver Design Considerations | 2020/9/21 | ||||
| 應用說明 | Some Guidelines and Tips for the LED Driver Application | 2019/8/14 | ||||
| 應用說明 | Performing Accurate PFM Mode Efficiency Measurements (Rev. A) | 2018/12/11 | ||||
| 選擇指南 | Power Management Guide 2018 (Rev. R) | 2018/6/25 |
設計與開發
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TPS61196EVM-600 — WLED 驅動器燈串評估模組
德州儀器 TPS61196EVM-600 評估模組 (EVM) 有助於設計人員評估 TPS61196 的運作與性能，它是一款多通道 WLED 驅動器，為 LCD TV 背光提供高度整合的解決方案。此 EVM 專為在 10V-30V 範圍內的輸入電壓源運作而設計，並為 6 通道 LED 提供 787mA 輸出電流。
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| HTSSOP (PWP) | 28 | Ultra Librarian |
訂購與品質
建議產品可能具有與此 TI 產品相關的參數、評估模組或參考設計。