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LP8556 数据表(PDF) 9 Page - Texas Instruments |
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LP8556 数据表(HTML) 9 Page - Texas Instruments |
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9 / 63 page  9 LP8556 www.ti.com SNVS871I – JULY 2012 – REVISED MARCH 2016 Product Folder Links: LP8556 Submit Documentation Feedback Copyright © 2012–2016, Texas Instruments Incorporated (1) Minimum (MIN) and Maximum (MAX) limits are specified by design, test, or statistical analysis. Typical numbers are not verified, but do represent the most likely norm. (2) Output Current Accuracy is the difference between the actual value of the output current and programmed value of this current. Matching is the maximum difference from the average. For the constant current sinks on the part (OUT1 to OUT6), the following are determined: the maximum output current (MAX), the minimum output current (MIN), and the average output current of all outputs (AVG). Two matching numbers are calculated: (MAX-AVG)/AVG and (AVG-MIN/AVG). The largest number of the two (worst case) is considered the matching figure. The typical specification provided is the most likely norm of the matching figure for all parts. Note that some manufacturers have different definitions in use. (3) Verified by design and not tested in production. (4) Saturation voltage is defined as the voltage when the LED current has dropped 10% from the value measured at 1 V. 7.7 Electrical Characteristics — LED Driver over operating free-air temperature range (unless otherwise noted) (1) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT ILED_LEAKAGE Leakage current Outputs LED1...LED6, VOUT = 48 V 0.1 1 µA ILED_MAX Maximum sink current LED1...LED6 50 mA ILED LED current accuracy(2) Output current set to 23 mA –3% 1% 3% Output current set to 23 mA, –30°C ≤ TA ≤ 85°C –4% 1% 4% IMATCH Matching Output current set to 23 mA 0.5% PWMDUTY LED PWM output pulse duty cycle(3) 100 Hz < fPWM ≤ 200 Hz 0.02% 100% 200 Hz < fPWM ≤ 500 Hz 0.02% 100% 500 Hz < fPWM ≤ 1 kHz 0.02% 100% 1 kHz < fPWM ≤ 2 kHz 0.04% 100% 2 kHz < fPWM ≤ 5 kHz 0.1% 100% 5 kHz < fPWM ≤ 10 kHz 0.2% 100% 10 kHz < fPWM ≤ 20 kHz 0.4% 100% 20 kHz < fPWM ≤ 30 kHz 0.6% 100% 30 kHz < fPWM ≤ 39 kHz 0.8% 100% fLED PWM output frequency PWM_FREQ = 1111 38.5 kHz VSAT Saturation voltage(4) Output current set to 23 mA 200 mV (1) Minimum (MIN) and Maximum (MAX) limits are specified by design, test, or statistical analysis. Typical numbers are for information only. (2) Verified by design and not tested in production. 7.8 Electrical Characteristics — PWM Interface (1) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT fPWM PWM frequency range(2) 75 25 000 Hz tMIN_ON Minimum pulse ON time 1 μs tMIN_OFF Minimum pulse OFF time 1 tSTARTUP Turnon delay from standby to backlight on PWM input active, VDDIO pin transitions from 0 V to 1.8 V 10 ms tSTBY Turnoff delay PWM input low time for turnoff 50 ms PWMRES PWM input resolution ƒIN < 9 kHz 10 bits |
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