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ADD5201:  High Efficiency, Eight-String, White LED Driver for LCD Backlight Applications

The ADD5201 is a white LED driver for backlight applications based on high efficiency, current mode, step-up converter tech-nology. It is designed with a 0.15 Ω, 2.9 A internal switch and a pin adjustable operating frequency between 350 kHz and 1 MHz. The ADD5201 contains eight regulated current sources for uniform brightness intensity. Each current source can be driven up to 30 mA.

The ADD5201 drives up to eight parallel strings of multiple series connected LEDs with a ±1.5% current regulation accuracy. The device provides an adjustable LED driving current up to 30 mA for each channel by an external resistor. The ADD5201 provides various brightness control methods. The LED dimming control can be achieved through SMBus and/or pulse-width modulation (PWM) input. Each dimming mode is selectable with two external dimming mode selection pins. The device pro-vides a pin adjustable output dimming frequency range from 200 Hz to 10 kHz.

The ADD5201 operates over an input voltage range of 6 V to 21 V, but the device can function with a voltage as low as 5.4 V. The ADD5201 has multiple safety protection features to prevent damage during fault conditions. If any LED is open or short, the device automatically disables the faulty current regulator. The internal soft start prevents inrush current during startup. A thermal shutdown protection prevents thermal damage.

The ADD5201 is available in a low profile, thermally enhanced, 4 mm × 4 mm × 0.75 mm, 28-lead, RoHS compliant lead frame chip scale package (LFCSP) and is specified over the industrial temperature range of −25°C to +85°C.

产品应用 Notebook PCs, UMPCs, and monitor displays FEATURES and BENEFITS White LED driver based on inductive boost converter -- Integrated 50 V MOSFET with 2.9 A peak current limit -- Input voltage range: 6 V to 21 V -- Maximum output adjustable up to 45 V 350 kHz to 1 MHz adjustable operating frequency Built-in soft start for boost converter Drives up to eight LED current sources -- LED current adjustable up to 30 mA for each channel -- Headroom control to maximize efficiency -- Adjustable output dimming frequency: 200 Hz to 10 kHz -- LED open/short fault protection Other LED current -- Selectable brightness control interface modes -- PWM input -- SMBus serial interface Selectable dimming controls -- Fixed delay PWM dimming control with 8-bit resolution -- No delay PWM dimming control with 8-bit resolution -- Phase shift PWM dimming control with 8-bit resolution Selectable dimming controls -- Direct PWM dimming control -- DC current dimming mode with 8-bit resolution General -- Thermal shutdown -- Undervoltage lockout -- 28-lead, 4 mm × 4 mm LFCSP

Functional Block Diagram for ADD5201

ADD5201 产品订购信息

ADD5201/ADD5203 Evaluation Board

技术资料