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A8502KLPTR-T Datasheet(PDF) 6 Page - Allegro MicroSystems |
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A8502KLPTR-T Datasheet(HTML) 6 Page - Allegro MicroSystems |
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6 / 35 page  Wide Input Voltage Range, High Efficiency Fault Tolerant LED Driver A8502 6 Allegro MicroSystems, LLC 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 0.9 1 1.1 MHz RFSET = 35.6 kΩ 520 580 640 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 V SYNC(H) FSET/SYNC pin, high level −− 0.4 V V SYNC(L) FSET/SYNC pin, low level 2.0 −− V LED Current Sinks LEDx Accuracy ErrLED ISET = 120 μA −− 2% LEDx Matching ΔLEDx ISET = 120 μA −− 1% LEDx Regulation Voltage VLED VLED1 = VLED2, ISET = 120 μA 620 720 820 mV ISET to ILEDx Current Gain AISET ISET = 120 μA 960 980 1000 A/A ISET Pin Voltage VISET 0.988 1.003 1.018 V Allowable ISET Current ISET 40 − 120 μA VLED Short Detect VLEDSC While LED sinks are in regulation, sensed from LEDx pin to ground 4.6 5.1 5.6 V Soft Start LEDx Current ILEDSS Current through each enabled LEDx pin during soft start − 3.2 − mA Maximum PWM Dimming Until Off-Time2 tPWML Measured while PWM/EN = low, during dimming control and internal references are powered-on (exceeding tPWML results in shutdown) − 32,750 − fSW cycles Minimum PWM On-Time tPWMH First cycle when powering-up device − 0.75 2 μs PWM High to LED-On Delay tdPWM(on) Time between PWM enable and LED current reaching 90% of maximum − 0.5 1 μs PWM Low to LED-Off Delay tdPWM(off) Time between PWM enable going low and LED current reaching 10% of maximum − 360 500 ns ELECTRICAL CHARACTERISTICS1,2 (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 125°C; unless otherwise noted Characteristics Symbol Test Conditions Min. Typ. Max. Unit Continued on the next page… |
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