MIC2287 Micrel Semiconductor, MIC2287 Datasheet
MIC2287
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MIC2287 Summary of contents
Page 1
... LED driver applications. With a maximum output voltage of 34V and a switch current of over 500mA, the MIC2287 easily drives a string white LEDs in series, ensuring uniform brightness and eliminating several ballast resistors. The MIC2287 implements a constant frequency, 1.2MHz PWM control scheme ...
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... MIC2287 Ordering Information Marking Overvoltage Part Number Code Protection MIC2287BD5 SGAA MIC2287YD5 SGAA MIC2287-15BML SLA MIC2287-15YML SLA MIC2287-24BML SLB MIC2287-24YML SLB MIC2287-34BML SLC MIC2287-34YML SLC Pin Configuration FB GND VIN TSOT-23-5 (BD5) Pin Description Pin Number Pin Number TSOT-23-5 2mm 2mm MLF™ ...
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... I 20mA OUT 10V EN SW TURN ON TURN OFF V = 10V EN MIC2287BML- 15 only MIC2287BML- 24 only MIC2287BML- 34 only Hysteresis , and the ambient temperature The maximum allowable power dissipation will result in excessive (2) ) ........................................ 2.5V to 10V IN ) ........... – +125 C J 2mmMLF™ ..................................... 93 C .......................................... 256 C 125 C. ...
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... MIC2287 Typical Characteristics Feedback Voltage vs. Input Voltage 100 ( Series LED Efficiency 0.22 F OUT (mA) OUT EN Pin Bias Current vs. Temperature 50 45 ...
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... REF 95mV * OVP available on MLF Functional Description The MIC2287 is a constant frequency, PWM current mode boost regulator. The block diagram is shown above. The MIC2287 is composed of an oscillator, slope compensation ramp generator, current amplifier, g generator, and a 500mA bipolar output transistor. The oscil- lator generates a 1.2MHz clock. The clock’ ...
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... MIC2287 External Component Selection The MIC2287 can be used across a wide rage of applications. Series LEDs 6 6 6 6 6.8 H 4.7 H M0510-081104 The table below shows recommended inductor and output capacitor values for various series-LED applications ...
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... If the LEDs are disconnected from the circuit case an LED fails open, the sense resistor will pull the FB pin to ground. This will cause the MIC2287 to switch with a high duty-cycle, resulting in output overvoltage. This may cause the SW pin voltage to exceed its maximum voltage rating, possibly damaging the IC and the external components ...
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... MIC2287 6-Series LED Circuit without External Soft-Start TIME (100 s/div.) M0510-081104 6-Series LED Circuit with External Soft-Start 0.22 F OUT 20mA OUT 6 LEDs 8 Micrel 0.22 F OUT 20mA OUT 6 LEDs C = 2200pF 10k TIME (100 s/div.) ...
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... MIC2287 Package Information August 2004 All Dimensions are in millimeters 5-Pin TSOT (BD5) 8-Pin MLF™ (BML) 9 Micrel M0510-081104 ...
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... MIC2287 Recommended Land Pattern for MLF™ Lead MICREL, INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 USA + 1 (408) 944-0800 TEL The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. ...