Microchip MIC3223 Bedienungsanleitung
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MIC3223
High Power Boost LED Driver with
Integrated FET
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
January 2010
M9999-011510-A
General Description
The MIC3223 is a constant current boost LED driver
capable of driving a series string of high power LEDs. The
MIC3223 can be used in general lighting, bulb replacement,
garden pathway lighting and other solid state illumination
applications.
The MIC3223 is a peak current mode control PWM boost
regulator and the 4.5V and 20V operating input voltage
range allows multiple applications from a 5V or a 12V bus.
The MIC3223 implements a fixed internal 1MHz switching
frequency to allow for a reduction in the design footprint
size. Power consumption has been minimized through the
implementation of a 200mV feedback voltage that provides
an accuracy of ±5%. The MIC3223 can be dimmed through
the use of a PWM signal and features an enable pin for a
low power shutdown state.
The MIC3223 is a very robust LED driver and offers the
following protection features: over voltage protection (OVP),
thermal shutdown, switch current limiting and under voltage
lockout (UVLO).
The MIC3223 is offered in a low profile exposed pad 16-pin
TSSOP package.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Features
•4.5V to 20V supply voltage
•200mV feedback voltage with an accuracy of ±5%
•Step-up output voltage (boost) conversion up to 37V
•1MHz switching frequency
• 100mΩ/3.5A internal power FET switch
•LEDs can be dimmed using a PWM signal
•User settable LED current (through external resistor)
•Externally programmable soft-start
•Protection features that include:
– Output over-voltage protection (OVP)
– Under-voltage lockout (UVLO)
– Over temperature protection
•Junction temperature range: -40°C to +125°C
•Available in a exposed pad 16-pin TSSOP package
Applications
• Architectural lighting
• Industrial lighting
• Signage
• Landscape lighting (garden/pathway)
• Under cabinet lighting
• MR-16 bulbs
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Typical Application
Produktspezifikationen
| Marke: | Microchip |
| Kategorie: | Nicht kategorisiert |
| Modell: | MIC3223 |
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