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A6268KLPTR-T Datasheet(PDF) 1 Page - Allegro MicroSystems |
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A6268KLPTR-T Datasheet(HTML) 1 Page - Allegro MicroSystems |
1 / 19 page Description The A6268 is a DC-to-DC converter controller, providing a programmable constant current output for driving high power LEDs in series. Driving the LEDs in series ensures identical currents and uniform brightness. For automotive applications, optimum performance is achieved when driving up to 15 LEDs at currents up to 1 A. TheA6268 provides a cost-effective solution using an external logic-level MOSFET and minimum additional external components. The maximum LED current is set with a single external sense resistor and can be modified using a current reference input. Direct PWM control is possible via the Enable input, which also provides a shutdown mode. ThisDC-DCconvertercanbeconfiguredasaground-referenced boost converter or as a supply-referenced boost converter providing buck-boost capability.The buck-boost topology used ensures that there is no leakage path through the LEDs when in shutdown and no inrush current at power-up. Integrated diagnostics and two fault outputs give indication of VIN and VREG undervoltage, chip overtemperature, output open circuit, LED short circuit and LED undercurrent, and can be configured to provide short to supply and short to ground protection for the LED connections, LED overcurrent and shorted LED string protection. A unique feature is the ability to detect one or more shorted LEDs. Thedeviceisprovidedina16-pinTSSOPpackagewithexposed thermal pad (suffix LP). It is lead (Pb) free, with 100% matte tin leadframe plating. A6268-DS, Rev. 1 Features and Benefits ▪ AEC Q100 Grade 0 Automotive Qualified ▪ Constant current LED drive ▪ 5 to 50 V supply ▪ Boost or buck-boost modes ▪ Drives up to 15 LEDs in series ▪ Programmable switching frequency 100 to 700 kHz ▪ Open LED overvoltage indication and protection ▪ Single and multiple LED short indication ▪ LED short to ground and supply protection ▪ PWM dimming control ▪ 10 μA shutdown current including LED leakage Automotive High Current LED Controller Package: 16-pin TSSOP with exposed thermal pad (suffix LP) Applications: Typical Application Diagrams Not to scale A6268 Buck-Boost Mode (Supply-referenced boost) Boost Mode ▪ Automotive high power LED lighting systems ▪ Fog lights, reversing lights, daytime running lights ▪ Headlights LN LP LF SG SP SN GND LA Fault Flags Power net VREG FF1 FF2 EN IREF CKOUT OSC Enable A6268 VIN VBAT 12 V or 24 V (50 V max) GND LA VBAT 12 V or 24 V (50 V max) LN LP LF SG SP SN Fault Flags Power net FF1 FF2 EN IREF CKOUT OSC Enable A6268 VREG VIN Boost Mode VBAT(min) (V) Maximum Quantity of LEDs 58 610 712 813 915 Vf of each LED = 3.5 V, D(max) = 85% Buck Boost Mode VBAT(min) (V) Maximum Quantity of LEDs 57 68 710 811 913 Vf of each LED = 3.5 V, D(max) = 85% |
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