SpeLuce

Fotofori robusti

Batterie

2 x NiMH 2 x Alcaline 1 x LiFePO

LED

http://www.cree.com/~/media/files/cree/led%20components%20and%20modules/xlamp/data%20and%20binning/xlamp7090xre.pdf

buck converter

IRLML2502 http://www.irf.com/product-info/datasheets/data/irlml2502.pdf

• http://www.onsemi.com/pub/Collateral/TND388-D.PDF Effects of High Switching Frequency on Buck Regulators
• http://www.ti.com/litv/pdf/snva598 Driving LEDs: To Cap or Not to Cap
• http://ww1.microchip.com/downloads/en/appnotes/01427a.pdf AN1427 High-Efficiency Solutions for Portable LED Lighting
• http://ww1.microchip.com/downloads/en/appnotes/01047a.pdf AN1047 Buck-Boost LED Driver Using the PIC16F785 MCU

Current sensing

• http://ledsmagazine.com/features/10/10/15
• http://www.aosmd.com/res/application_notes/power-ics/PIC-007.pdf Selection of Three Locations of Current Sense Resistor in Buck Converter

Sincrono

• http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1824&appnote=en560160 Efficiency Analysis of a Synchronous Buck Converter using Microsoft Office Excel-Based Loss Calculator

High Side Drivers

• http://www.linear.com/product/LTC1982 Micropower High Side Switch Controllers in SOT-23

Asincrono

duty cycle

up

(3.3 ∕ 4.8) = 0.68

down

0.31

efficienza

0.31 ⋅ (0.385 ∕ 3.3) ≈ 0.03 di perdita sul diodo

• http://www.st.com/web/catalog/sense_power/FM64/CL1571/SC541/SS1617/PF64858 Low Drop Power Schottky Rectifier 1A/0.385vf
• http://www.st.com/web/catalog/sense_power/FM64/CL1571/SC541/SS1617/PF64876 2A/0.43vf

uC

• nuovo http://www.microchip.com/wwwproducts/Devices.aspx?product=PIC16F1709 con opamp e pwm

Mappa pin

pic16f1709

Pin	Funzione	Nome	porta sul uC	I/O
1			VDD
2			RA5	O
3			RA4	O
4		MCLR	RA3/MCLR
5			RC5	O
6			RC4	O
7			RC3/OPA2OUT	O
8			RC6/OPA2IN-	O
9			RC7/OPA2IN+	I
10			RB7	I
11			RB6	I
12			RB5/OPA1IN+	I
13			RB4/OPA1IN-	I
14			RC2/OPA1OUT
15			RC1/PWM4OUT
16			RC0/PWM3OUT
17			RA2/AN2
18			RA1/AN1
19			RA0/AN0
20		VSS

• http://www.element14.com/community/servlet/JiveServlet/downloadBody/27644-102-1-76820/01138A.pdf
• http://ww1.microchip.com/downloads/en/devicedoc/41214a.pdf PICmicro® CCP and ECCP Tips 'n Tricks
• http://ww1.microchip.com/downloads/en/appnotes/01171c.pdf How To Use The Capacitive Sensing Module (CSM)
• http://ww1.microchip.com/downloads/en/AppNotes/01103a.pdf Software Handling for Capacitive Sensing
• http://www.epd-ee.eu/article/8346 10 LED Driver Problems Solved by the PIC12HV752 MCU

Step up

• http://www.linear.com/product/LTC3490
• http://www.microchip.com/wwwproducts/Devices.aspx?product=MCP1643