ISL97672 Intersil, ISL97672 Datasheet
ISL97672
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ISL97672 Summary of contents
Page 1
... The ISL97672 features a separate EN pin and extensive protection functions that flag whenever a fault occurs. The protections include string open and short circuit detections, OVP, OTP, thermal shutdown and an optional input overcurrent protection with fault disconnect switch ...
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... FET Logic Driver Imax ILIMIT Fault/Status Control GM Highest VF String Detect VSET + - PWM0 REF_VSC PWM1 ISL97672 FIGURE 2. ISL97672 BLOCK DIAGRAM www.DataSheet4U.com 40mA 45V*, 25mA per string 78 (6x13) LEDs 4.7uF/50V LX OVP OVP PGND p e Open Ckt, Short Ckt Detects CH0 CH1 CH5 0 Temp ...
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... Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. 3. For Moisture Sensitivity Level (MSL), please see device information page for ISL97672. For more information on MSL please see techbrief TB363. Pin Descriptions (I = Input Output Supply) ...
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... Guaranteed Range for PWM Input High Voltage FPWM PWM Input Frequency Range t Minimum On Time ON 4 ISL97672 Thermal Information (T = +25°C) A Thermal Resistance (Typical QFN Package (Notes Thermal Characterization (Typical QFN Package (Note ...
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... Headroom at IIN Pin V Voltage at RSET Pin RSET I Maximum LED Current per Channel LEDmax FAULT DETECTION VSC Short Circuit Threshold Temp_shtdwn Temperature Shutdown Threshold Temp_Hyst Temperature Shutdown Hysteresis 5 ISL97672 = 25° 12V 5V MIN CONDITION (Note 8) V > > 5.5V, 20mA ...
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... LED(mA) FIGURE 3. EFFICIENCY 20mA LED CURRENT (100% LED DUTY CYCLE ISL97672 = 25° CONDITION When Fault Occurs V = 12V 12 VDC = 5.0V is 28V. Minimum V can be lower at lower V OUT OUT 100 5V IN ...
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... V IN FIGURE 7. EFFICIENCY TEMPERATURE AT IN 20mA (100% LED DUTY CYCLE) 1.2 1.0 0.8 0 0.4 0 FIGURE 9. CURRENT LINEARITY vs LOW LEVEL PWM DIMMING DUTY CYCLE ISL97672 (Continued) 100 1.2MHz FIGURE 6. EFFICIENCY vs V 0.40 0.30 0.20 -40°C 0.10 0.00 -0.10 -0.20 -0.30 -0. FIGURE 8. CHANNEL-TO-CHANNEL CURRENT 0.60 0.55 4 ...
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... OUT AT 20mA/CHANNEL FIGURE 13. IN-RUSH AND LED CURRENT AT V FOR 6P12S AT 20mA/CHANNEL FIGURE 15. LINE REGULATION WITH V FROM 26V TO 6V FOR 6P12S AT 20mA/CHANNEL 8 ISL97672 (Continued) = 12V, 6P12S FIGURE 12. IN-RUSH and LED CURRENT 12V FIGURE 14. LINE REGULATION WITH V IN FIGURE 16. LOAD REGULATION WITH I ...
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... AC/DC adapter without rendering a noticeable visual nuisance. The number of LEDs that can be driven by ISL97672 depends on the type of LED chosen in the application. The ISL97672 is capable of boosting up to 45V and typically driving 13 LEDs in series for each of the 8 channels, enabling a total of 104 pieces of the 3 ...
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... The output voltage will regulate cycle by cycle and it is always referenced to the highest forward voltage string in the architecture. Dimming Controls The ISL97672 allows two ways of controlling the LED current, and therefore, the brightness. They are current adjustment 2. PWM chopping of the LED current defined in Step 1. ...
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... Due to the lag in boost response to any load change at its output, certain transient events (such as LED current steps or significant step changes in LED duty cycle) can transiently look like LED fault modes. The ISL97672 uses feedback from the LEDs to determine when stable operating region and prevents apparent faults during these transient events from allowing any of the LED stacks to fault out ...
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... CH0 Open Circuit Upper OTP not with infinite triggered and CH0 resistance < ISL97672 finally 25%. Unless disabled via the EN pin, the device stays in an active state throughout. For the extensive fault protection conditions, please refer to Figure 20 and Table 1 for details ...
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... OUT operation OVP pins monitored for excursions below 20% of OVP threshold. 13 ISL97672 TABLE 1. PROTECTIONS TABLE (Continued) FAILED CHANNEL ACTION CH1 remains ON and has highest VF, thus V increases. OUT All channels go off until chip cooled and then comes back on with current reduced to 76%. ...
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... D higher the series resistance because of the extra winding of the coil. Thus the higher the inductance, the lower the peak current capability. The ISL97672 current limit may also have to be taken into account. (EQ. 8) Output Capacitors (EQ. 9) ...
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... Schottky diode must be used. Applications High Current Applications Each channel of the ISL97672 can support up to 30mA. For applications that need higher current, multiple channels can be grouped to achieve the desirable current. For example, the cathode of the last LED can be connected to CH0 to CH2 ...
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... No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see 16 ISL97672 for a complete list of Intersil product families. ISL97672 www.intersil.com/askourstaff http://rel.intersil.com/reports/search.php www.intersil.com/product_tree www.intersil.com/design/quality www.DataSheet4U.com CHANGE www ...
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... Package Outline Drawing L20.3x4 20 LEAD QUAD FLAT NO-LEAD PLASTIC PACKAGE Rev 1, 3/10 3. PIN 1 INDEX AREA A TOP VIEW (2.65) (3.80) (1.65) (2.80) TYPICAL RECOMMENDED LAND PATTERN 17 ISL97672 A B 20X 4 4.00 0.15 (4X) VIEW "A-A" 20x 0.40±0.10 (16 x 0.50) (20 x 0.25) (20 x 0.60) NOTES: 1. Dimensions are in millimeters. Dimensions Dimensioning and tolerancing conform to AMSE Y14.5m-1994. ...