{"id":7323,"date":"2016-11-06T20:55:15","date_gmt":"2016-11-07T02:55:15","guid":{"rendered":"http:\/\/www.sector67.org\/blog\/shop\/electronics\/b2flex-led-driver-from-taskled\/"},"modified":"2016-11-06T21:00:01","modified_gmt":"2016-11-07T03:00:01","slug":"b2flex-led-driver-from-taskled","status":"publish","type":"product","link":"https:\/\/www.sector67.org\/blog\/shop\/electronics\/b2flex-led-driver-from-taskled\/","title":{"rendered":"b2Flex 1.5A LED Driver from TaskLED"},"content":{"rendered":"<p>1 Description<br \/>\nThe heart of b2Flex is a Microcontroller (uC) that contains the user interface firmware. Features of<br \/>\nthis circuit\/UI combination include:<br \/>\n\u2022 Choice of 3 different User Interfaces, UIF fixed lighting optimized, UIP portable lighting<br \/>\noptimized and UIB2 bicycle lighting optimized.<br \/>\n\u2022 High efficiency Buck mode (step down) switching regulator (maximum drive current set in<br \/>\nfirmware).<br \/>\n\u2022 Single switch to select from various brightness levels, turn the unit on\/off, select the<br \/>\noperating modes and set menu options.<br \/>\n\u2022 Non-volatile (EEPROM) storage of operating mode, last selected brightness level, and<br \/>\nmaximum drive level (350mA, 500mA, 750mA, 1000mA, 1200mA or 1500mA).<br \/>\n\u2022 Voltage sensing with three user configurable trip points for \u00bd discharged and nearly fully<br \/>\ndischarged and forced off (or warn only). Warning display via an optional 3mm or 5mm<br \/>\nstatus LED or via the main LED.<br \/>\n\u2022 Temperature sensing with user configurable trip point to limit output current to protect the<br \/>\ndriver and\/or LED. <\/p>\n<ul>\n<li><a href=\"http:\/\/taskled.com\/leds\/b2flexuni_v1.00.pdf\"><font face=\"Comic Sans MS\"><b>b2Flex.pdf<\/b><\/font><\/a> <font face=\"Arial\"> (<font size=\"2\">V1.0,  manual for b2Flex V1.0 &#8211; UI-UNI2 firmware)<\/font><\/font><\/li>\n<\/ul>\n<p align=\"left\"><strong><font face=\"Verdana\">Efficiency Measurements:<\/font><\/strong><\/p>\n<p align=\"left\"><font face=\"Verdana\">As with any buck driver, efficiency is highest when input voltage is closer to output voltage and also with higher voltages. So, a 1 LED (3.3V Vf) system will be less efficient than say a 3 LED (10V Vf) system.<\/font><\/p>\n<p align=\"left\"><font face=\"Verdana\">Typical measured efficiency values are shown in the table below<\/font><\/p>\n<table width=\"483\" border=\"1\">\n<tr>\n<td width=\"76\"><span class=\"style8\"># LEDs <\/span><\/td>\n<td width=\"120\"><span class=\"style8\">Input Voltage <\/span><\/td>\n<td width=\"137\"><span class=\"style8\">Output Current <\/span><\/td>\n<td width=\"122\"><span class=\"style8\">Efficiency<\/span><\/td>\n<\/tr>\n<tr>\n<td>\n<div align=\"center\" class=\"style8\">1<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">4V<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">350mA<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">87%<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<div align=\"center\" class=\"style8\">1<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">10V<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">350mA<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">80%<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<div align=\"center\" class=\"style8\">1<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">14.8<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">350mA<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">76%<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<div align=\"center\" class=\"style8\">2<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">8V<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">500mA<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">91%<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<div align=\"center\" class=\"style8\">2<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">14.8V<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">500mA<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">88%<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<div align=\"center\" class=\"style8\">2<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">8V<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">750mA<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">91%<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<div align=\"center\" class=\"style8\">2<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">14.8V<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">750mA<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">89%<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<div align=\"center\" class=\"style8\">2<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">8V<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">1000mA<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">90%<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<div align=\"center\" class=\"style8\">2<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">14.8V<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">1000mA<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">89%<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<div align=\"center\" class=\"style8\">2<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">8V<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">1200mA<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">90%<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<div align=\"center\" class=\"style8\">2<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">14.8V<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">1200mA<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">88%<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<div align=\"center\" class=\"style8\">2<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">8V<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">1500mA<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">88%<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<div align=\"center\" class=\"style8\">2<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">14.8V<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">1500mA<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">87%<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<div align=\"center\" class=\"style8\">3<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">11V<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">350mA<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">92%<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<div align=\"center\" class=\"style8\">3<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">14.8V<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">350mA<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">88%<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<div align=\"center\" class=\"style8\">3<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">11V<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">500mA<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">93%<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<div align=\"center\" class=\"style8\">3<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">14.8V<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">500mA<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">91%<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<div align=\"center\" class=\"style8\">3<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">11V<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">750mA<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">92%<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<div align=\"center\" class=\"style8\">3<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">14.8V<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">750mA<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">91%<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<div align=\"center\" class=\"style8\">3<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">11V<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">1000mA<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">92%<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<div align=\"center\" class=\"style8\">3<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">14.8V<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">1000mA<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">91%<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<div align=\"center\" class=\"style8\">3<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">11V<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">1200mA<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">91%<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<div align=\"center\" class=\"style8\">3<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">14.8V<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">1200mA<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">90%<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<div align=\"center\" class=\"style8\">3<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">11V<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">1500mA<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">90%<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<div align=\"center\" class=\"style8\">3<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">14.8V<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">1500mA<\/div>\n<\/td>\n<td>\n<div align=\"center\" class=\"style8\">89%<\/div>\n<\/td>\n<\/tr>\n<\/table>\n<p align=\"left\"><font face=\"Verdana\">As can be seen from the table, in a 3 LED, 4 Li-Ion system, the b2Flex will be typically running around 90% efficient.<\/font><\/p>\n<p align=\"left\"><font face=\"Verdana\">So, assuming 3 LEDs with a total Vf of 10.5V at 1500mA we can calculate driver power dissipation as:<\/font><\/p>\n<p align=\"left\"><font face=\"Verdana\">10.5V x 1.5A x 0.1 = 1.6W<\/font><\/p>\n<p align=\"left\"><font face=\"Verdana\">It is HIGHLY recommended that the b2Flex be attached to a heatsink\/thermal path using the gold rectangular area in the following picture. <\/font><\/p>\n<p align=\"left\"><strong><font face=\"Verdana\">Potting Warning:<\/font><\/strong><\/p>\n<p align=\"left\"><font face=\"Verdana\">Areas of the circuitry on b2Flex utilize high impedance paths and if potting (not required) is to be utilized, the user must ensure than the compound is non-conductive and non-capacitive otherwise correct operation may be compromised. A product like Artic Alumina epoxy will work well.<\/font><\/p>\n<p align=\"left\"><font face=\"Verdana\">The following picture shows the top of b2Flex.<\/font><\/p>\n<p align=\"left\"><font face=\"Verdana\">T<\/font><font face=\"Verdana\">he X\/Y position of the various solder pads\/connection points is in the table below. X\/Y position 0,0 is the center of the board. X\/Y positions are in mils (0.001&#8243;, so -230 means -0.230&#8243;)<\/font><\/p>\n<p align=\"left\">&nbsp;<\/p>\n<p align=\"left\"><font face=\"Verdana\"><img loading=\"lazy\" decoding=\"async\" src=\"leds\/b2flext.jpg\" width=\"354\" height=\"344\"><\/font><\/p>\n<div id=\"Layer1\">\n<table width=\"295\" border=\"1\">\n<tr>\n<td width=\"92\">\n<div align=\"center\"><strong><span class=\"style8\">PAD<\/span><\/strong><\/div>\n<\/td>\n<td width=\"83\">\n<div align=\"center\"><strong><span class=\"style8\">X<\/span><\/strong><\/div>\n<\/td>\n<td width=\"98\">\n<div align=\"center\"><strong><span class=\"style8\">Y<\/span><\/strong><\/div>\n<\/td>\n<\/tr>\n<tr>\n<td><span class=\"style8\">LED-<\/span><\/td>\n<td><span class=\"style8\">-230<\/span><\/td>\n<td><span class=\"style8\">360<\/span><\/td>\n<\/tr>\n<tr>\n<td><span class=\"style8\">IN-<\/span><\/td>\n<td><span class=\"style8\">-40<\/span><\/td>\n<td><span class=\"style8\">415<\/span><\/td>\n<\/tr>\n<tr>\n<td><span class=\"style8\">STAT-<\/span><\/td>\n<td><span class=\"style8\">95<\/span><\/td>\n<td><span class=\"style8\">415<\/span><\/td>\n<\/tr>\n<tr>\n<td><span class=\"style8\">SWB<\/span><\/td>\n<td><span class=\"style8\">220<\/span><\/td>\n<td><span class=\"style8\">360<\/span><\/td>\n<\/tr>\n<tr>\n<td><span class=\"style8\">SWA<\/span><\/td>\n<td><span class=\"style8\">340<\/span><\/td>\n<td><span class=\"style8\">245<\/span><\/td>\n<\/tr>\n<tr>\n<td><span class=\"style8\">STAT<\/span><\/td>\n<td><span class=\"style8\">405<\/span><\/td>\n<td><span class=\"style8\">-100<\/span><\/td>\n<\/tr>\n<tr>\n<td><span class=\"style8\">LED+<\/span><\/td>\n<td><span class=\"style8\">355<\/span><\/td>\n<td><span class=\"style8\">-225<\/span><\/td>\n<\/tr>\n<tr>\n<td><span class=\"style8\">IN+<\/span><\/td>\n<td><span class=\"style8\">270<\/span><\/td>\n<td><span class=\"style8\">-330<\/span><\/td>\n<\/tr>\n<\/table>\n<\/div>\n<p align=\"left\">&nbsp;<\/p>\n<p align=\"left\"><font face=\"Verdana\">Input voltage connects to IN+ and IN-.<\/font><\/p>\n<p align=\"left\"><font face=\"Verdana\">The LED(s) connect to LED+ and LED- (NOTE: LED- is NOT the same as IN-).<\/font><\/p>\n<p align=\"left\"><font face=\"Verdana\">The control switch connects to SWA and SWB (SWB is electrically the same as IN-). <span class=\"style8\">The switch only switches a control signal and carries at most 350microamps.<\/span><\/font><\/p>\n<p align=\"left\"><font face=\"Verdana\">The status LED (optional) connects to STAT and STAT- (STAT- is electrically the same as IN-).<\/font><\/p>\n<p align=\"left\"><font face=\"Verdana\">The following picture shows the bottom of b2Flex.<\/font><\/p>\n<p align=\"center\"><font face=\"Verdana\"><img loading=\"lazy\" decoding=\"async\" src=\"leds\/b2flexb.jpg\" width=\"400\" height=\"394\"><\/font><\/p>\n<p>Cost here includes all taxes, local pickup only on tour days or please schedule a pickup time via the contact us link at the top right.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>1 Description The heart of b2Flex is a Microcontroller (uC) that contains the user interface firmware. Features of this circuit\/UI combination include: \u2022 Choice of 3 different User Interfaces, UIF fixed lighting optimized, UIP portable lighting optimized and UIB2 bicycle<span class=\"ellipsis\">&hellip;<\/span><\/p>\n<div class=\"read-more\"><a href=\"https:\/\/www.sector67.org\/blog\/shop\/electronics\/b2flex-led-driver-from-taskled\/\">Read more &#8250;<\/a><\/div>\n<p><!-- end of .read-more --><\/p>\n","protected":false},"featured_media":7324,"comment_status":"closed","ping_status":"closed","template":"","meta":[],"product_brand":[],"product_cat":[535],"product_tag":[],"class_list":["post-7323","product","type-product","status-publish","has-post-thumbnail","product_cat-electronics","first","instock","taxable","shipping-taxable","purchasable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/www.sector67.org\/blog\/wp-json\/wp\/v2\/product\/7323","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.sector67.org\/blog\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.sector67.org\/blog\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/www.sector67.org\/blog\/wp-json\/wp\/v2\/comments?post=7323"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.sector67.org\/blog\/wp-json\/wp\/v2\/media\/7324"}],"wp:attachment":[{"href":"https:\/\/www.sector67.org\/blog\/wp-json\/wp\/v2\/media?parent=7323"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.sector67.org\/blog\/wp-json\/wp\/v2\/product_brand?post=7323"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.sector67.org\/blog\/wp-json\/wp\/v2\/product_cat?post=7323"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.sector67.org\/blog\/wp-json\/wp\/v2\/product_tag?post=7323"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}