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A6267 Datasheet(PDF) 6 Page - Allegro MicroSystems |
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A6267 Datasheet(HTML) 6 Page - Allegro MicroSystems |
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6 / 17 page  Automotive High Current LED Controller A6267 6 Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com OSC Watchdog Period tOSWD Between successive rising edges 7 – – μs CKOUT Output High Voltage VCOH IOH = –1 mA VREG – 1 – VREG V CKOUT Output Low Voltage VCOL IOL = 1 mA – – 0.4 V LED Current Sense Input Bias Current LN (BB mode)3 ILN LP = LN = VIN – 6 – μA Input Bias Current LP (BB mode)3 ILP LP = LN = VIN – 220 – μA Input Bias Current LN (B mode)3 ILN LP = LN = 0 V – –2 – μA Input Bias Current LP (B mode)3 ILP LP = LN = 0 V – –25 – μA Differential Input Voltage (Active) VIDL EN = High, VIDL = VLP – VLN – 100 – mV Input Common-Mode Range (BB mode)3 VCMLH VLP = VLN VIN –VIN + 1 V Input Common-Mode Range (B mode)3 VCMLL VLP = VLN 0 – 1 V Current Error EISL [(10 × ILED × RSL) – 1] × 100 –5 – 5 % Switch Current Sense Input Bias Current IBIASS SP = SN = 0 to 2 V –30 – – μA Maximum Differential Input Voltage4 VIDS VIDS = VSP – VSN with D = 50% 110 145 180 mV Input Source Current IINS VIDS = 120 mV – 120 – μA Input Common-Mode Range VCMS VSP = VSN 0 – 2 V Diagnostics and Protection Fault Blank Timer5 tFB Start-up – 3 – ms VREG Undervoltage Turn-Off VREGUV Decreasing VREG 4.1 4.3 4.5 V VREG Undervoltage Hysteresis VREGUVhys 130 150 160 mV LED String Short Voltage VSCL 430 505 580 mV Non-Reference LED Short Offset Voltage VSCO 160 200 240 mV Reference LED Short Offset Voltage VSCOR 430 505 580 mV LED Open Voltage VOCL 5 5.5 6 V LF Bias Current (BB mode)3 ILF LF = LA = VIN + 1.7 V – 46 – μA LA Bias Current (BB mode)3 ILA LF = LA = VIN + 1.7 V – 170 – μA LF Bias Current (B mode)3 ILF LF = 1.7 V – 8 – μA LA Bias Current (B mode)3 ILA LA = 1.7 V – 34 – μA LED Undercurrent Voltage Difference6 VUCL – 1 – mV Open Fault Time-Out tOTO fOSC = 350 kHz – 94 – ms Overtemperature Warning Threshold TJF Temperature increasing – 170 – ºC Overtemperature Hysteresis TJhys Recovery = TJF – TJhys –15– ºC 1For input and output current specifications, negative current is defined as coming out of (sourcing) the specified device pin. 2Function is correct but parameters are not guaranteed below the general limit (8 V). 3BB mode = buck-boost (supply-referenced) mode, B mode = boost (ground-referenced) mode. 4Parameters guaranteed by design. 5Fault Blank timer not enabled for open-LED condition. 6Undercurrent when VSENSEL < VIDL– VUCL, where VSENSEL is the voltage across the LED current sense resistor RSL. ELECTRICAL CHARACTERISTICS1 (continued) Valid at TJ = –40°C to 150°C, VIN = 8 to 40 V; unless otherwise noted Characteristics Symbol Test Conditions Min. Typ. Max. Unit Oscillator (continued) |
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