Maxim offers high-brightness (HB) LED drivers with a wide input voltage range, the MAX16801/MAX16802. The MAX16801 is suitable for general-purpose AC input (85V to 265V AC voltage rectified input) LED drivers. The MAX16802 is suitable for DC input voltage LED drivers (10.8V to 24VDC with higher input voltages with external bias).
According to Maxim, the MAX16801/MAX16802 feature a fixed switching frequency of 262kHz and a current mode control scheme. Combined with an external MOSFET, it delivers high power output (over 50W) and achieves high efficiency (over 85%). Allows the use of small size components, which reduces system cost.
The driver IC can drive several series of HB LEDs in series, and a wide adjustment range (0 to 100%) can be achieved by PWM or linear brightness adjustment. Designers can use an on-board error amplifier and a 1% accuracy benchmark when accurate LED current regulation is required. The device is suitable for buck, boost, SEPIC, isolated or non-isolated flyback topologies for general lighting applications, decorative and architectural lighting, display backlighting, and other constant current source LED applications.
Both devices feature a 45μA startup current, allowing the use of large-resistance startup resistors and small-capacity startup capacitors. LED drivers start up quickly and consume less power. The input voltage undervoltage lockout (UVLO) is enabled by an external resistor divider to set the input startup voltage; pulling the UVLO pin low turns the device off.
The MAX16801/MAX16802 feature a digital soft-start that better controls the rise in output current during startup. This fundamentally eliminates the output current overshoot. Both devices feature thermal shutdown and a 50% or 75% maximum duty cycle.
The MAX16801/MAX16802 are rated for operation over the extended temperature range (-40°C to +85°C) in a surface mount, lead-free, 8-pin μMAX package. Prices start at $0.63 (1,000 sheets, FOB USA).
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