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TC6501P075VCT Datasheet(PDF) 4 Page - Microchip Technology |
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TC6501P075VCT Datasheet(HTML) 4 Page - Microchip Technology |
4 / 20 page 4 LED Lighting Solutions Design Guide www.microchip.com/lighting LED Lighting Solutions Driving LEDs with a Boost Regulator A boost regulator topology is used when the output voltage of the converter must be equal to or greater than the input voltage. A boost regulator is useful for driving a chain of LEDs connected in series. It is beneficial to drive multiple LEDs in series. This ensures that all LEDs receive the same amount of current and will have the same brightness level. Using a coupled inductor in the boost circuit reducing the switching voltage requirements of the MOSFET switch. The MCP1640 synchronous boost regulator can provide a stable operating voltage for an LED from a single cell alkaline battery. The MCP1650 Boost Regulator uses an external switch so that it can be used for any type of load. An additional advantage of the MCP1650 in battery applications is the Gated Oscillator Architecture which provides 2 duty cycles reducing high-peak inductor current and output ripple voltages. Input voltages above 3.8V engage a 56% duty cycle and an 80% duty cycle when the input voltage drops below 3.8V, extending battery life in these applications. Driving LEDs with a Charge Pump A charge pump power supply does not have inductors that are required in other SMPS topologies. This provides a more compact and less expensive circuit. The downside is that charge pumps cannot supply large amounts of current compared to the other topologies. Charge pump circuits are most useful for backlighting applications. Common applications include PCs, LCD displays and automotive instrumentation. MCP1252 Charge Pump Backlight Demonstration Board (MCP1252DM-BKLT) Demonstrates the use of a charge pump device in an LED application and acts as a platform to evaluate the MCP1252 device in general. Light intensity is controlled uniformly through the use of ballast resistors. A PIC10F206 MCU provides an enable signal to the MCP1252 and accepts a push-button input that allows the white LEDs to be adjusted to five different light intensities. Literature on the Web ■ MCP1252/3 Data Sheet, DS21572 ■ MCP1252 Charge Pump Backlight Demo Board User’s Guide, DS51551 ■ MCP1252/3 Evaluation Kit User’s Guide, DS51313 ■ DG10 – Power Solutions Design Guide, DS21913 Charge Pump LED Driver Using the MCP1252 3 1 7 8 2 4 56 C- FB GND PG VIN VOUT C+ SHDN Single Li-Ion Cen PWM Brightness Control MCP1252-ADJ VIN 0.9V to 1.7V VOUT 3.3V @ 100 mA COUT 10 μF 976 KΩ 562 KΩ CIN 4.7 μF L1 4.7 μH VOUT VFB VIN SW EN GND MCP1640 MCP1640 Single Cell Synchronous Boost Regulator |
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