TPS61177

適用于筆記本和平板電腦顯示屏的 WLED 驅(qū)動(dòng)器，具有固定模式調(diào)光功能; ? 2.5V to 24V Input Voltage Range\n? 39 V Maximum Output Voltage\n? Integrated 1.8 A /40 V MOSFET\n? 450 kHz to 1.2 MHz Programmable Switching Frequency\n? Adaptive Boost Output to WLED Voltages\n? 100Hz to 25kHz Wide Input PWM Dimming Frequency Range\n? 1% Minimum Dimming Duty Cycle\n? Small External Components\n? Integrated Loop Compensation\n? Six Current Sinks of 30mA Max\n? 1% (Typical) Current Matching\n? Input PWM Glitch Filter\n? PWM Brightness Interface Control\n? Three Optional Dimming Methods, Including Direct PWM Dimming, Analog Dimming and Analog/PWM Mixed Dimming\n? Built-in WLED Open Protection\n? Thermal Shutdown\n? 20 Leads 3.5mm × 3.5mm × 0.9mm QFN Package;

The TPS61177 IC provides a highly integrated WLED driver solution for notebook LCD backlight. This device has a built-in high efficiency boost regulator with integrated 1.8A /40V power MOSFET. The six current sink regulators provide high precision current regulation and matching. In total, the device can support up to 72 WLEDs. In addition, the boost output automatically adjusts its voltage to the WLED forward voltage to optimize efficiency. The TPS61177 supports the analog dimming, analog/PWM dimming and direct PWM dimming method. During analog dimming mode, each CS current linearly varies depending on the duty cycle information on the PWMB pins. During analog and PWM mixed dimming mode, the input PWM duty cycle information is translated to analog signal to control the WLED current linearly over 25% to 100% brightness area. And the device also allows adding PWM dimming when the analog current down to 25%. Below 25%, the analog signal will translate to PWM duty cycle information to control the on/off of WLED current and average the WLED current down to 1%. The frequency of adding PWM dimming is same to input PWM frequency on the PWMB pin. While the TPS61177 also supports direct PWM dimming method, in direct PWM dimming mode the WLED current is turned on/off synchronized with the input PWM signal.

TPS61177

PACKAGE MATERIALS INFORMATION

TPS61177A

適用于筆記本和平板電腦顯示屏的 WLED 驅(qū)動(dòng)器; ? 2.5V 至 24V 輸入電壓范圍\n? 39V 最大輸出電壓\n? 集成 1.8A、40V 金屬氧化物半導(dǎo)體場效應(yīng)晶體管 (MOSFET)\n? 450kHz 至 1.2MHz 可編程開關(guān)頻率\n? 為白色發(fā)光二極管 (WLED) 提供電壓的自適應(yīng)升壓輸出\n? 100Hz 至 25kHz 寬輸入脈寬調(diào)制 (PWM) 調(diào)光頻率范圍\n? 1% 最小調(diào)光占空比\n? 小型外部組件\n? 集成環(huán)路補(bǔ)償\n? 六路最高 30mA 的灌電流\n? 1% 電流匹配（典型值）\n? 輸入 PWM 毛刺脈沖濾波器\n? PWM 亮度接口控制\n? 三種調(diào)光方法可供選擇，包括直接 PWM 調(diào)光、模擬調(diào)光以及模擬和 PWM 混合調(diào)光\n? 內(nèi)置 WLED 開路保護(hù)\n? 熱關(guān)斷;

TPS61177A 器件可為筆記本 LCD 背光提供高度集成的白色 LED (WLED) 驅(qū)動(dòng)器解決方案。該器件內(nèi)置高效升壓穩(wěn)壓器，穩(wěn)壓器集成有 1.8A、40V 功率 MOSFET。六個(gè)灌電流穩(wěn)壓器提供了高精度的電流調(diào)節(jié)和匹配。該器件總共可支持 72 個(gè) WLED。此外，升壓輸出還可自動(dòng)地將其電壓調(diào)節(jié)至 WLED 正向電壓以優(yōu)化效率。\n\nTPS61177A 支持模擬調(diào)光、模擬和 PWM 混合調(diào)光以及直接 PWM 調(diào)光三種方法。在模擬調(diào)光模式下，各 CS 電流將根據(jù) PWMB 引腳上的占空比信息線性變化。在模擬和 PWM 混合調(diào)光模式下，輸入 PWM 占空比信息將轉(zhuǎn)換成模擬信號，以在 25% 至 100% 的亮度區(qū)域線性控制 WLED 電流。該器件還可在模擬電流低至 25% 時(shí)增加 PWM 調(diào)光。電流低于 25% 后，模擬信號會(huì)轉(zhuǎn)換成 PWM 占空比信息以控制 WLED 電流的導(dǎo)通或關(guān)斷并求取低至 1% 的 WLED 電流的平均值。增加 PWM 調(diào)光的頻率與 PWMB 引腳上的輸入 PWM 頻率相同。TPS61177A 還支持直接 PWM 調(diào)光方法，在直接 PWM 調(diào)光模式下，將根據(jù) PWM 輸入信號同步導(dǎo)通或關(guān)斷 WLED 電流。

TPS61177A

WLED Driver for Notebooks

TPS61177ARGRR

WLED Driver for Notebooks

TPS61177RGRR

PACKAGE MATERIALS INFORMATION

TPS61177AEVM

包裝：盒 類別：開發(fā)板，套件，編程器 評估板 - LED 驅(qū)動(dòng)器 描述：TPS61177AEVM

TPS61177ARGRR

Package：20-VFQFN 裸露焊盤；包裝：卷帶（TR）剪切帶（CT）Digi-Reel? 得捷定制卷帶 類別：集成電路（IC） LED 驅(qū)動(dòng)器 描述：IC LED DRV RGLTR PWM 30MA 20VQFN

TPS61177RGRR

Package：20-VFQFN 裸露焊盤；包裝：卷帶（TR） 類別：集成電路（IC） LED 驅(qū)動(dòng)器 描述：IC LED DRV RGLTR PWM 30MA 20VQFN