{"id":4732,"date":"2026-02-27T06:10:50","date_gmt":"2026-02-27T06:10:50","guid":{"rendered":"https:\/\/flj-pcb.com\/?p=4732"},"modified":"2026-02-27T06:10:54","modified_gmt":"2026-02-27T06:10:54","slug":"how-to-select-pcb-copper-thickness","status":"publish","type":"post","link":"https:\/\/flj-pcb.com\/cs\/how-to-select-pcb-copper-thickness\/","title":{"rendered":"Jak vybrat tlou\u0161\u0165ku m\u011bdi na PCB"},"content":{"rendered":"<h2 class=\"wp-block-heading\">1. Co je m\u011bd\u011bn\u00e1 f\u00f3lie?<\/h2>\n\n\n\n<p>M\u011bd\u011bn\u00e1 f\u00f3lie je tenk\u00fd souvisl\u00fd kovov\u00fd plech. Jedn\u00e1 se o elektrolyticky nan\u00e1\u0161en\u00fd materi\u00e1l negativn\u00edho typu. F\u00f3lie je nanesena na z\u00e1klad desky plo\u0161n\u00fdch spoj\u016f. Na desce funguje jako vodi\u010d. Dob\u0159e se spojuje s izola\u010dn\u00edmi vrstvami. P\u0159eb\u00edr\u00e1 p\u00e1jec\u00ed masku a dal\u0161\u00ed ochrann\u00e9 vrstvy. Po vylept\u00e1n\u00ed tvo\u0159\u00ed zb\u00fdvaj\u00edc\u00ed m\u011b\u010f vzor obvodu. V po\u010d\u00e1tc\u00edch v\u00fdroby se pou\u017e\u00edvala v\u00e1lcovan\u00e1 m\u011bd\u011bn\u00e1 f\u00f3lie. To znamen\u00e1, \u017ee m\u011bd\u011bn\u00e9 bloky se zplo\u0161tily do tenk\u00fdch plech\u016f.<\/p>\n\n\n\n<p>Jak siln\u00e1 je m\u011bd\u011bn\u00e1 f\u00f3lie na desce plo\u0161n\u00fdch spoj\u016f?<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2. Jednotka pro tlou\u0161\u0165ku m\u011bdi: oz<\/h2>\n\n\n\n<p>Tlou\u0161\u0165ka m\u011bdi na desk\u00e1ch plo\u0161n\u00fdch spoj\u016f se obvykle ud\u00e1v\u00e1 v oz (unce). Unce je jednotka hmotnosti. Vztah mezi unc\u00ed a gramem je n\u00e1sleduj\u00edc\u00ed:<br>1 oz \u2248 28,35 g.<\/p>\n\n\n\n<p>V odv\u011btv\u00ed v\u00fdroby desek plo\u0161n\u00fdch spoj\u016f znamen\u00e1 1 oz hmotnost 1 oz m\u011bdi rovnom\u011brn\u011b rozlo\u017een\u00e9 na 1 \u010dtvere\u010dn\u00ed stopu (ft\u00b2). Tato rovnom\u011brn\u00e1 vrstva m\u00e1 ur\u010ditou tlou\u0161\u0165ku. Tato tlou\u0161\u0165ka je p\u0159ibli\u017en\u011b 35 \u03bcm. Pomoc\u00ed vzorce:<br>1 oz = 28,35 g \/ ft\u00b2.<\/p>\n\n\n\n<p>N\u00ed\u017ee uv\u00e1d\u00edm v\u00fdpo\u010det krok za krokem, aby byl v\u00fdsledek jasn\u00fd:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Hmotnost 1 oz: 28,35 g.<\/li>\n\n\n\n<li>Hustota m\u011bdi: 8,93 g\/cm\u00b3.<\/li>\n\n\n\n<li>1 ft\u00b2 = 929,03 cm\u00b2.<\/li>\n<\/ul>\n\n\n\n<p>Tlou\u0161\u0165ka v cm = hmotnost \/ (hustota \u00d7 plocha)<br>= 28,35 \/ (8,93 \u00d7 929,03) cm<br>= 28,35 \/ 82973,558 \u2248 0,00341721 cm.<\/p>\n\n\n\n<p>P\u0159eve\u010fte na mikrometry (\u03bcm): 0,00341721 cm = 0,00341721 \u00d7 10 000 \u03bcm = 34,17 \u03bcm.<\/p>\n\n\n\n<p>Tak\u017ee 1 oz m\u011bd\u011bn\u00e9 f\u00f3lie \u2248 <strong>34,17 \u03bcm<\/strong>. Tato hodnota se obvykle zaokrouhluje a uv\u00e1d\u00ed se jako <strong>35 \u03bcm<\/strong>. V imperi\u00e1ln\u00edch jednotk\u00e1ch je 34,17 \u03bcm = 0,03417 mm. Jeden mil = 0,0254 mm, tak\u017ee tlou\u0161\u0165ka \u2248 1,345 mil. Lid\u00e9 \u010dasto \u0159\u00edkaj\u00ed <strong>1 oz \u2248 35 \u03bcm \u2248 1,35 mil<\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">3. B\u011b\u017en\u00e9 hodnoty tlou\u0161\u0165ky m\u011bdi<\/h2>\n\n\n\n<p>B\u011b\u017en\u00e9 hodnoty tlou\u0161\u0165ky m\u011bdi pou\u017e\u00edvan\u00e9 v desk\u00e1ch plo\u0161n\u00fdch spoj\u016f jsou:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>0,5 oz \u2248 17,5 \u03bcm<\/li>\n\n\n\n<li>1 oz \u2248 35 \u03bcm<\/li>\n\n\n\n<li>2 oz \u2248 70 \u03bcm<\/li>\n\n\n\n<li>3 oz \u2248 105 \u03bcm<\/li>\n<\/ul>\n\n\n\n<p>Typick\u00e9 jednoduch\u00e9 a <a href=\"https:\/\/flj-pcb.com\/cs\/pcb-manufacturer\/multilayer-pcb\/\" data-type=\"link\" data-id=\"https:\/\/flj-pcb.com\/pcb-manufacturer\/multilayer-pcb\/\">oboustrann\u00e9 desky plo\u0161n\u00fdch spoj\u016f<\/a> pou\u017e\u00edt o <strong>35 \u03bcm (1 oz)<\/strong> m\u011b\u010f. N\u011bkter\u00e9 desky pou\u017e\u00edvaj\u00ed <strong>50 \u03bcm<\/strong> nebo <strong>70 \u03bcm<\/strong> tak\u00e9 m\u011b\u010f. U v\u00edcevrstv\u00fdch desek jsou vn\u011bj\u0161\u00ed vrstvy \u010dasto <strong>35 \u03bcm (1 oz)<\/strong>. Vnit\u0159n\u00ed vrstvy jsou \u010dasto <strong>17,5 \u03bcm (0,5 oz)<\/strong>.<\/p>\n\n\n\n<p>Tlust\u00e9 m\u011bd\u011bn\u00e9 desky za\u010d\u00ednaj\u00ed na cen\u011b p\u0159ibli\u017en\u011b <strong>3 oz<\/strong> a v\u00fd\u0161e. Tyto desky se pou\u017e\u00edvaj\u00ed v silnoproud\u00fdch nebo vysokonap\u011b\u0165ov\u00fdch v\u00fdrobc\u00edch, jako jsou nap\u00e1jec\u00ed zdroje.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">4. Proudov\u00e1 zat\u00ed\u017eitelnost pro r\u016fzn\u00e9 tlou\u0161\u0165ky m\u011bdi<\/h2>\n\n\n\n<p>N\u00ed\u017ee je uvedena praktick\u00e1 tabulka s typickou proudovou zat\u00ed\u017eitelnost\u00ed m\u011bd\u011bn\u00fdch p\u00e1sk\u016f r\u016fzn\u00e9 tlou\u0161\u0165ky a \u0161\u00ed\u0159ky. V tabulce je uveden proud (A) a po\u017eadovan\u00e1 \u0161\u00ed\u0159ka (mm) pro m\u011b\u010f o tlou\u0161\u0165ce <strong>70 \u03bcm<\/strong>, <strong>50 \u03bcm<\/strong>, a <strong>35 \u03bcm<\/strong>. Parametr zku\u0161ebn\u00ed tlou\u0161\u0165ky v tabulce je t = 10 (jedn\u00e1 se o vzorovou referen\u010dn\u00ed hodnotu pou\u017eitou ve zdrojov\u00e9 tabulce).<\/p>\n\n\n\n<p><strong>Pozn\u00e1mka:<\/strong> P\u0159i pou\u017eit\u00ed m\u011bd\u011bn\u00e9 f\u00f3lie jako vodi\u010de pro velk\u00fd proud se b\u011b\u017en\u011b sni\u017euj\u00ed tabulkov\u00e9 hodnoty o <strong>50%<\/strong> pro bezpe\u010dnou volbu. To znamen\u00e1, \u017ee pokud chcete m\u00edt bezpe\u010dnostn\u00ed rezervu, zvolte \u0161\u00ed\u0159ku, kter\u00e1 odpov\u00edd\u00e1 p\u0159ibli\u017en\u011b polovin\u011b uveden\u00e9ho proudu.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Proud (A) \/ \u0161\u00ed\u0159ka (mm) pro 70 \u03bcm<\/th><th>Proud (A) \/ \u0161\u00ed\u0159ka (mm) pro 50 \u03bcm<\/th><th>Proud (A) \/ \u0161\u00ed\u0159ka (mm) pro 35 \u03bcm<\/th><\/tr><\/thead><tbody><tr><td>6,00 A - 2,50 mm<\/td><td>5,10 A - 2,50 mm<\/td><td>4,50 A - 2,50 mm<\/td><\/tr><tr><td>5,10 A - 2,00 mm<\/td><td>4,30 A - 2,00 mm<\/td><td>4,00 A - 2,00 mm<\/td><\/tr><tr><td>4,20 A - 1,50 mm<\/td><td>3,50 A - 1,50 mm<\/td><td>3,20 A - 1,50 mm<\/td><\/tr><tr><td>3,60 A - 1,20 mm<\/td><td>3,00 A - 1,20 mm<\/td><td>2,70 A - 1,20 mm<\/td><\/tr><tr><td>3,20 A - 1,00 mm<\/td><td>2,60 A - 1,00 mm<\/td><td>2,30 A - 1,00 mm<\/td><\/tr><tr><td>2,80 A - 0,80 mm<\/td><td>2,40 A - 0,80 mm<\/td><td>2,00 A - 0,80 mm<\/td><\/tr><tr><td>2,30 A - 0,60 mm<\/td><td>1,90 A - 0,60 mm<\/td><td>1,60 A - 0,60 mm<\/td><\/tr><tr><td>2,00 A - 0,50 mm<\/td><td>1,70 A - 0,50 mm<\/td><td>1,35 A - 0,50 mm<\/td><\/tr><tr><td>1,70 A - 0,40 mm<\/td><td>1,35 A - 0,40 mm<\/td><td>1,10 A - 0,40 mm<\/td><\/tr><tr><td>1,30 A - 0,30 mm<\/td><td>1,10 A - 0,30 mm<\/td><td>0,80 A - 0,30 mm<\/td><\/tr><tr><td>0,90 A - 0,20 mm<\/td><td>0,70 A - 0,20 mm<\/td><td>0,55 A - 0,20 mm<\/td><\/tr><tr><td>0,70 A - 0,15 mm<\/td><td>0,50 A - 0,15 mm<\/td><td>0,20 A - 0,15 mm<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Op\u011bt zvolte bezpe\u010dnou mar\u017ei. B\u011b\u017en\u00fdm pravidlem je sn\u00ed\u017eit tyto tabulkov\u00e9 hodnoty o 50% p\u0159i n\u00e1vrhu pro v\u00fdrobu.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">5. Dal\u0161\u00ed praktick\u00e9 pozn\u00e1mky k m\u011bdi jako vodi\u010di<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Pokud pou\u017e\u00edv\u00e1te m\u011bd\u011bnou f\u00f3lii jako dlouh\u00fd vodi\u010d, mus\u00edte zkontrolovat jej\u00ed proudovou zat\u00ed\u017eitelnost. Vezm\u011bte nap\u0159\u00edklad typickou tlou\u0161\u0165ku <strong>0,03 mm (30 \u03bcm)<\/strong>. M\u00e1-li m\u011bd\u011bn\u00fd p\u00e1sek \u0161\u00ed\u0159ku W (mm) a d\u00e9lku L (mm), lze stejnosm\u011brn\u00fd odpor p\u0159ibli\u017en\u011b vypo\u010d\u00edtat podle: R \u2248 0,0005 \u00d7 L \/ W (ohm) Tento vzorec umo\u017e\u0148uje rychl\u00fd odhad pro kontrolu n\u00e1vrhu.<\/li>\n\n\n\n<li>Proudov\u00e1 kapacita m\u011bdi z\u00e1vis\u00ed tak\u00e9 na sou\u010d\u00e1stk\u00e1ch na desce, po\u010dtu a typech sou\u010d\u00e1stek a chlazen\u00ed. Skute\u010dn\u00e1 proudov\u00e1 kapacita tedy z\u00e1vis\u00ed jak na geometrii m\u011bdi, tak na tepeln\u00fdch podm\u00ednk\u00e1ch.<\/li>\n\n\n\n<li>Praktick\u00e9 pravidlo zn\u00ed: proudov\u00e1 kapacita \u2248 0,15 \u00d7 W (A). Jedn\u00e1 se o empirick\u00fd odhad, kter\u00fd se v n\u011bkter\u00fdch p\u0159\u00edpadech pou\u017e\u00edv\u00e1. Pro mnoho desek je jednoduch\u00fd a konzervativn\u00ed.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">6. P\u0159\u00edklad: plocha a proudov\u00e1 hustota<\/h2>\n\n\n\n<p>Vezm\u011bme si b\u011b\u017en\u00fd p\u0159\u00edpad: tlou\u0161\u0165ka m\u011bdi <strong>35 \u03bcm<\/strong> a \u0161\u00ed\u0159ka stopy <strong>1 mm<\/strong>. Plocha pr\u016f\u0159ezu je:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Plocha = tlou\u0161\u0165ka \u00d7 \u0161\u00ed\u0159ka = 0,035 mm \u00d7 1 mm = 0,035 mm\u00b2.<\/li>\n<\/ul>\n\n\n\n<p>Pokud pou\u017eijete pravidlo proudov\u00e9 hustoty <strong>30 A\/mm\u00b2<\/strong>, pak proud na 1 mm \u0161\u00ed\u0159ky \u2248 30 \u00d7 0,035 = 1,05 A. Podle tohoto pravidla tedy zhruba 1 A na mm \u0161\u00ed\u0159ky stopy.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">7. Vzorce IPC pro p\u0159esn\u011bj\u0161\u00ed n\u00e1r\u016fst proudu a teploty<\/h2>\n\n\n\n<p><a href=\"https:\/\/www.electronics.org\/TOC\/IPC-2152.pdf\" target=\"_blank\" rel=\"noopener\">IPC-2152<\/a> a <a href=\"https:\/\/standards.globalspec.com\/std\/155369\/ipc-d-275\" data-type=\"link\" data-id=\"https:\/\/standards.globalspec.com\/std\/155369\/ipc-d-275\" target=\"_blank\" rel=\"noopener\">IPC-D-275<\/a> poskytuj\u00ed p\u0159esn\u011bj\u0161\u00ed modely. Text obsahuje vzorce IPC-D-275 v b\u011b\u017en\u00e9 podob\u011b:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Pro vnit\u0159n\u00ed stopy: I = 0,0150 \u00d7 (\u0394T^0,5453) \u00d7 (A^0,7349)<\/li>\n\n\n\n<li>Pro vn\u011bj\u0161\u00ed stopy: I = 0,0647 \u00d7 (\u0394T^0,4281) \u00d7 (A^0,6732)<\/li>\n<\/ul>\n\n\n\n<p>V t\u011bchto vzorc\u00edch:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>I je proud v amp\u00e9rech.<\/li>\n\n\n\n<li>\u0394T je povolen\u00fd n\u00e1r\u016fst teploty ve \u00b0C.<\/li>\n\n\n\n<li>A je plocha pr\u016f\u0159ezu v milimetrech\u00b2 (nebo v jin\u00fdch jednotk\u00e1ch podle toho, jak vzorec pou\u017eijete). P\u0159i pou\u017eit\u00ed vzorc\u016f pou\u017e\u00edvejte jednotn\u00e9 jednotky.<\/li>\n<\/ul>\n\n\n\n<p>Pokud pot\u0159ebujete p\u0159esn\u00fd povolen\u00fd proud pro dan\u00fd n\u00e1r\u016fst teploty, pou\u017eijte metody IPC.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">8. Tlou\u0161\u0165ka m\u011bdi a dielektrick\u00e9 p\u0159izp\u016fsoben\u00ed<\/h2>\n\n\n\n<p>V n\u00e1vrhu desek plo\u0161n\u00fdch spoj\u016f \u201cslad\u011bn\u00ed tlou\u0161\u0165ky m\u011bdi a dielektrika\u201d znamen\u00e1, \u017ee tlou\u0161\u0165ku m\u011bdi a dielektrika desky vol\u00edte spole\u010dn\u011b. Je to proto, aby byly spln\u011bny elektrick\u00e9, tepeln\u00e9 a mechanick\u00e9 pot\u0159eby. Kl\u00ed\u010dov\u00e9 body:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">8.1 Hmotnost m\u011bdi (tlou\u0161\u0165ka m\u011bdi)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Jednotka: oz\/ft\u00b2 (nap\u0159\u00edklad 0,5 oz, 1 oz, 2 oz, 3 oz).<\/li>\n\n\n\n<li>1 oz \u2248 35 \u03bcm \u2248 1,35 mil.<\/li>\n\n\n\n<li>\u00da\u010dinky:\n<ul class=\"wp-block-list\">\n<li>Proudov\u00e1 zat\u00ed\u017eitelnost: siln\u011bj\u0161\u00ed m\u011b\u010f p\u0159en\u00e1\u0161\u00ed v\u00edce proudu.<\/li>\n\n\n\n<li>Ztr\u00e1ty: p\u0159i vysok\u00fdch frekvenc\u00edch je d\u016fle\u017eit\u00fd skin efekt. Siln\u011bj\u0161\u00ed m\u011b\u010f m\u016f\u017ee v n\u011bkter\u00fdch p\u0159\u00edpadech sn\u00ed\u017eit ztr\u00e1ty na vodi\u010di.<\/li>\n\n\n\n<li>Tepeln\u00e9: siln\u011bj\u0161\u00ed m\u011b\u010f pom\u00e1h\u00e1 \u0161\u00ed\u0159en\u00ed tepla.<\/li>\n\n\n\n<li>Lept\u00e1n\u00ed: siln\u011bj\u0161\u00ed m\u011b\u010f zt\u011b\u017euje jemn\u00e9 lept\u00e1n\u00ed. Minim\u00e1ln\u00ed \u0161\u00ed\u0159ka stopy a rozte\u010d se m\u016f\u017ee zv\u011bt\u0161it.<\/li>\n\n\n\n<li>N\u00e1klady: siln\u011bj\u0161\u00ed m\u011b\u010f stoj\u00ed v\u00edce.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">8.2 Dielektrick\u00fd materi\u00e1l<\/h3>\n\n\n\n<p>Kl\u00ed\u010dov\u00e9 dielektrick\u00e9 vlastnosti:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Dielektrick\u00e1 konstanta (Dk nebo \u03b5r): ovliv\u0148uje rychlost sign\u00e1lu a impedanci.<\/li>\n\n\n\n<li>Ztr\u00e1tov\u00fd tangens (Df): ovliv\u0148uje vysokofrekven\u010dn\u00ed ztr\u00e1ty.<\/li>\n\n\n\n<li>Tlou\u0161\u0165ka (H): s tlou\u0161\u0165kou m\u011bdi H rozhoduje o impedanci a kapacit\u011b.<\/li>\n\n\n\n<li>CTE a Tg: tepeln\u00e1 spolehlivost.<br>B\u011b\u017en\u00e9 materi\u00e1ly: <strong>fr4<\/strong> pro v\u0161eobecn\u00e9 pou\u017eit\u00ed, fr4 s vysok\u00fdm Tg a speci\u00e1ln\u00ed vysokofrekven\u010dn\u00ed materi\u00e1ly (nap\u0159. Rogers).<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">8.3 Pravidla p\u0159i\u0159azov\u00e1n\u00ed<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Pro \u0159\u00edzen\u00ed impedance je b\u011b\u017en\u00fd mikrop\u00e1skov\u00fd vzorec: Z0 \u2248 (87 \/ sqrt(\u03b5r_eff + 1,41)) * ln(5,98H \/ (0,8W + T)), kde Z0 je impedance, \u03b5r_eff je efektivn\u00ed dielektrick\u00e1 konstanta, H je tlou\u0161\u0165ka dielektrika, W je \u0161\u00ed\u0159ka stopy, T je tlou\u0161\u0165ka m\u011bdi.<\/li>\n\n\n\n<li>Zv\u011bt\u0161\u00ed-li se tlou\u0161\u0165ka m\u011bdi, impedance se p\u0159i stejn\u00e9 \u0161\u00ed\u0159ce a dielektriku sn\u00ed\u017e\u00ed. Proto je nutn\u00e9 zv\u011bt\u0161it \u0161\u00ed\u0159ku nebo tlou\u0161\u0165ku dielektrika, aby byla zachov\u00e1na stejn\u00e1 impedance.<\/li>\n\n\n\n<li>U vysokofrekven\u010dn\u00edch sign\u00e1l\u016f je d\u016fle\u017eit\u00e1 hloubka k\u016f\u017ee. Tlou\u0161\u0165ka m\u011bdi by m\u011bla b\u00fdt alespo\u0148 n\u011bkolikan\u00e1sobkem hloubky skinu p\u0159i nejvy\u0161\u0161\u00ed frekvenci, kter\u00e1 v\u00e1s zaj\u00edm\u00e1. Pro velmi vysok\u00e9 frekvence je d\u016fle\u017eit\u00e1 tak\u00e9 drsnost povrchu. Pokud pot\u0159ebujete n\u00edzk\u00e9 ztr\u00e1ty, pou\u017eijte m\u011b\u010f s n\u00edzkou drsnost\u00ed.<\/li>\n\n\n\n<li>U v\u00fdkonov\u00fdch rovin a silnoproud\u00fdch za\u0159\u00edzen\u00ed pou\u017e\u00edvejte siln\u011bj\u0161\u00ed m\u011b\u010f (\u2265 2 oz) a zva\u017ete tepeln\u011b vodiv\u00e9 dielektrick\u00e9 desky nebo desky s kovov\u00fdm j\u00e1drem pro \u0159\u00edzen\u00ed tepla.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">8.4 Vyrobitelnost<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Siln\u00e1 m\u011b\u010f (\u2265 3 oz) pot\u0159ebuje v\u011bt\u0161\u00ed pravidla pro stopu\/rozte\u010d, aby se p\u0159ede\u0161lo probl\u00e9m\u016fm s lept\u00e1n\u00edm.<\/li>\n\n\n\n<li>Tenk\u00e1 dielektrika vy\u017eaduj\u00ed p\u0159\u00edsnou kontrolu tlou\u0161\u0165ky m\u011bdi. Odchylky ovliv\u0148uj\u00ed impedanci.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">9. V\u00fdb\u011brov\u00e1 tabulka (stru\u010dn\u00fd pr\u016fvodce)<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Sc\u00e9n\u00e1\u0159 aplikace<\/th><th>Doporu\u010den\u00e1 hmotnost m\u011bdi<\/th><th>Doporu\u010den\u00fd dielektrick\u00fd materi\u00e1l<\/th><th>Odpov\u00eddaj\u00edc\u00ed d\u016fvod<\/th><\/tr><\/thead><tbody><tr><td>Vysokorychlostn\u00ed digit\u00e1ln\u00ed p\u0159enos (&gt;5 Gb\/s)<\/td><td>0,5 oz - 1 oz<\/td><td>FR4 s n\u00edzk\u00fdm Df \/ <a href=\"https:\/\/www.rogerscorp.com\/advanced-electronics-solutions\/ro4000-series-laminates\" target=\"_blank\" rel=\"noopener\">Rogers RO4000<\/a><\/td><td>Jemn\u00e9 sm\u011brov\u00e1n\u00ed, n\u00edzk\u00e9 ztr\u00e1ty, snadn\u011bj\u0161\u00ed \u0159\u00edzen\u00ed impedance.<\/td><\/tr><tr><td>V\u00fdkonov\u00e9 moduly \/ vysok\u00fd proud<\/td><td>2 oz - 6 oz+<\/td><td><a href=\"https:\/\/flj-pcb.com\/cs\/fr-4-pcb-guide-properties-limits-material-choices\/\" data-type=\"post\" data-id=\"4641\">FR4<\/a> Materi\u00e1ly s vysokou Tg \/ vysokou tepelnou vodivost\u00ed<\/td><td>Vy\u0161\u0161\u00ed proudov\u00e1 kapacita a lep\u0161\u00ed odvod tepla.<\/td><\/tr><tr><td>RF \/ mikrovlnn\u00e9 (&gt;10 GHz)<\/td><td>0,5 oz (n\u00edzk\u00e1 drsnost)<\/td><td><a href=\"https:\/\/www.rogerscorp.com\/advanced-electronics-solutions\/ro3000-series-laminates\" target=\"_blank\" rel=\"noopener\">Rogers RO3000<\/a> \/ <a href=\"https:\/\/flj-pcb.com\/cs\/pcb-substrate-classification-and-material-properties\/\" data-type=\"post\" data-id=\"4685\">Teflon (PTFE)<\/a><\/td><td>Velmi n\u00edzk\u00e9 ztr\u00e1ty a optimalizovan\u00e9 povrchov\u00e9 efekty pro RF.<\/td><\/tr><tr><td>Obecn\u00e1 spot\u0159ebn\u00ed elektronika<\/td><td>1 oz<\/td><td>standard FR4<\/td><td>Vyv\u00e1\u017een\u00e9 n\u00e1klady a vysp\u011blost procesu.<\/td><\/tr><tr><td>Desky HDI s vysokou hustotou<\/td><td>0,5 oz - 1 oz<\/td><td>FR4 Materi\u00e1ly s vysokou Tg \/ n\u00edzkou CTE<\/td><td>Jemn\u00e9 stopy a spolehliv\u00fd v\u00fdkon laseru.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">10. Praktick\u00e9 rady<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Nejprve uve\u010fte sv\u00e9 pot\u0159eby: proud, rychlost sign\u00e1lu, impedance, teplo.<\/li>\n\n\n\n<li>Pl\u00e1nujte stohov\u00e1n\u00ed pomoc\u00ed vhodn\u00fdch n\u00e1stroj\u016f.<\/li>\n\n\n\n<li>Prove\u010fte impedan\u010dn\u00ed simulaci s materi\u00e1lem Dk a tlou\u0161\u0165kou m\u011bdi.<\/li>\n\n\n\n<li>Zeptejte se v\u00fdrobce desek na tolerance tlou\u0161\u0165ky m\u011bdi a mo\u017enosti dielektrika.<\/li>\n\n\n\n<li>U vysokofrekven\u010dn\u00edch p\u0159\u00edpad\u016f zm\u011b\u0159te materi\u00e1l Dk a Df, pokud je to mo\u017en\u00e9.<\/li>\n<\/ol>\n\n\n\n<p><strong>Pozn\u00e1mka:<\/strong> Jmenovit\u00e1 hmotnost m\u011bdi (nap\u0159. 1 oz) je po\u010d\u00e1te\u010dn\u00ed tlou\u0161\u0165ka p\u0159ed lept\u00e1n\u00edm. Po lept\u00e1n\u00ed m\u016f\u017ee m\u00edt stopa z\u00fa\u017een\u00e9 strany. Pro kontrolu skute\u010dn\u00e9 impedance pou\u017eijte bu\u010f pr\u016fm\u011brnou tlou\u0161\u0165ku, nebo vod\u00edtko v dom\u011b desky.<\/p>\n\n\n\n<p><\/p>","protected":false},"excerpt":{"rendered":"<p>1. What is copper foil? Copper foil is a thin, continuous metal sheet. It is an electro-deposited, negative-type material. 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