21ic News iWatt today introduced the latest LED drivers for LCD TV backlights. The new iW7011 is a 6-channel LED driver with an intelligent digital control engine developed to reduce material costs and simplify edge-lit and direct-lit LCD TVs. Its digital core provides built-in control of DC/DC boost circuits. Accurate LED dimming control and LED driver monitoring and feedback. The device also allows timing delays for dynamic scanning and the same components can be used to simplify designs on 2D and 3D TV applications. The device features an external LED sink and boost MOSFET for flexible current and voltage scaling (300mA per channel and Vout output voltage close to 85V) allowing engineers to use the same components for medium to large LCD TVs and displays Screen requirements. This article refers to the address: http:// The iW7011 integrates many design features to reduce BOM cost. Its built-in boost controller provides a high voltage power supply for the external LED string. The digital control engine allows real-time control of phase delay, is ideal for 3D TV-related phase control, and manages synchronization and error readings for 50Hz-480Hz Vsync signals, eliminating the need for costly microcontrollers. In addition, the iW7011 also supports 85V drain sensing, which means that Cascodes or Zener clamp circuits are no longer needed for protection, while high-voltage drain sensing eliminates the need for external diodes typically required for LED short-circuit error management. Athar Zaidi, vice president of DC/DC product marketing at iWatt, said: "We believe the iW7011 is the industry's first truly flexible, scalable, and inexpensive backlight solution. This solution can reduce bill of materials and allow for LCDs of different sizes. The same LED driver is used on the panel, and for 2D and 3D TVs, it also helps customers simplify their designs and introduce price-competitive products." The iW7011's digital control engine improves overall system efficiency by optimizing the DC-DC voltage, primarily based on the minimum feedback voltage of all LED strings and maintaining its nominal current regulation. In addition, the digital control engine generates a current PWM waveform, handles various error conditions, and reports all error messages. The iW7011 enables high precision of dimming control, supports 14-bit dimming resolution at 120Hz, and supports flexible sink current phase shift dimming in SPI dimming interface or direct PWM dimming mode. In addition, an 8-bit analog controller can be used to increase the dimming resolution, while phase-shift dimming can reduce the capacitance requirements at the input and output to improve dimming linearity and improve electromagnetic interference (EMI) performance. The device supports four phase-shift dimming options: three fixed 6-channel operation options and one adaptive phase shift option. In each option, the displacement is evenly distributed based on the number of active channels. The iW7011 supports an input voltage range of 10V-28V and LED current up to 300mA. It also provides 2% channel-to-channel matching accuracy and 0.5% absolute current accuracy, resulting in uniform brightness across the LCD display. Its built-in integrated protection features include boost converter over-voltage, over-current, UVLO and over-temperature protection, and support for LED driver open-circuit detection and short-circuit error protection. iW7011 package specification: 44 pin, 10 mm x 10 mm, 0.8 mm wide QFP package, pin for Single Layer PCB layout. iW7011 key features · 6-channel LED driver controller, 85V (maximum) LED voltage · Integrated DC/DC boost controller · 10V-28V voltage input range · Up to 300mA LED current · Support 2D and 3D LCD TV modes · Digital control scan mode · Dimming control: 14-bit 120Hz direct adaptation to phase shift PWM or SPI interface PWM dimming Pricing and availability The iW7011 LED driver is currently in volume production. The price of the sample in 1000 is $1.10.
An Integrated Circuit (IC) board, sometimes called a chip or microchip, is a semiconductor wafer on which thousands or millions of tiny resistors, capacitors, and transistors are fabricated. An IC can function as an amplifier, oscillator, timer, counter, computer memory, or microprocessor. A particular IC is categorized as either linear (analogue) or digital, depending on its intended application.
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