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A8510 Datasheet(PDF) 6 Page - Allegro MicroSystems |
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A8510 Datasheet(HTML) 6 Page - Allegro MicroSystems |
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6 / 33 page  Wide Input Voltage Range, High Efficiency Fault Tolerant LED Driver A8510 6 Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com Oscillator Frequency Oscillator Frequency fSW RFSET = 10 kΩ 1.8 2 2.2 MHz RFSET = 20 kΩ− 1 − MHz RFSET = 35.6 kΩ− 580 − kHz FSET/SYNC Pin Voltage VFSET RFSET = 10 kΩ− 1.00 − V FSET Frequency Range fFSET 580 − 2500 kHz Synchronization Synchronized PWM Frequency fSWSYNC 580 − 2300 kHz Synchronization Input Minimum Off-Time tPWSYNCOFF 150 −− ns Synchronization Input Minimum On-Time tPWSYNCON 150 −− ns SYNC Input Logic Voltage VSYNC(H) FSET/SYNC pin, high level −− 0.4 V VSYNC(L) FSET/SYNC pin, low level 2.0 −− V LED Current Sinks LEDx Accuracy ErrLED ISET = 120 μA −− 3% LEDx Matching ΔLEDx ISET = 120 μA −− 3% LEDx Regulation Voltage VLED VLED1 through VLED8 all equal, ISET = 120 μA − 680 − mV ISET to ILEDx Current Gain AISET ISET = 120 μA 317 327 337 A/A ISET Pin Voltage VISET − 1.003 − V Allowable ISET Current ISET 40 − 120 μA VLED Short Detect VLEDSC While LED sinks are in regulation, sensed from LEDx pin to GND 4.6 −− V Soft Start LEDx Current ILEDSS Current through each enabled LEDx pin during soft start, ISET = 120 μA − 1.06 − mA Maximum PWM Dimming Until Off-Time3 tPWML Measured while EN/PWM = low, during dimming control and internal references are powered-on (exceeding tPWML results in shutdown) − 32750 − fSW cycles Minimum EN/PWM On-Time tPWMH First cycle when powering-up device − 0.75 2 μs EN/PWM High to LED-On Delay tdPWM(on) Time between EN/PWM enable and LEDx current reaching 90% of maximum − 0.5 1 μs EN/PWM Low to LED-Off Delay tdPWM(off) Time between EN/PWM enable going low and LEDx current reaching 10% of maximum −− 500 ns VGATE Pin VGATE Pin Sink Current IGSINK VGS = VIN −−104 −μA VGATE Pin Fault Shutdown tGFAULT −− 3 μs VGATE Pin Voltage VGS Gate to source voltage measured when gate is on − –6.7 − V ELECTRICAL CHARACTERISTICS1 (continued) Valid at VIN = 16 V, TA = 25°C, indicates specifications guaranteed by design and characterization over the full operating temperature range with TA = TJ = –40°C to 105°C; unless otherwise noted Characteristics Symbol Test Conditions Min. Typ.2 Max. Unit Continued on the next page… |
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