SpeLuce

Fotofori robusti

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

• PIC12F1840 http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en549758
• http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en553476 ha piu pwm sembra

Mappa pin

Pin	Funzione	Nome	porta sul uC	I/O
1			VDD
2		PWM_UP	RA5/P1A-bis	O
3		PWM_DOWN/reserved	RA4/AN3/CPS3/P1B-bis	O
4		SIG_LED	RA3	O
5		CAP_PAD	RA2/AN2/CPS2/P1A	I
6		V_BATT	RA1/AN1/CPS1/ICSP_CLK	I
7		I_SENSE	RA0/AN0/CPS0/ICSP_DAT/P1B	I
8			VSS

• PIC16F1824 simile, 14 pin, 2 CCP, per controllare 2 led

Pin	Funzione	Nome	porta sul uC	I/O
1			VDD
2			RA5/P2A	O
3			RA4/AN3/CPS3/P2B
4			RA3/MCLR	O
5			P1A
6			P1B
7		RED_LED	AN7/CPS7
8		GREEN_LED	AN6/CPS6
9		R_SENSE_B	AN5/CPS5
10		R_SENSE_A	AN4/CPS3
11		V_BATT	AN2/CPS2
12		CAP_2	AN1/CPS1/ICSPCLK
13		CAP_1	AN0/CPS0/ICSPDAT
14		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