Понижающий DC-DC преобразователь на основе чипа Xl4015 — это дешевый и мощный для своего маленького размера модуль. У данного модуля можно регулировать как напряжение так и ток, для этого у модуля два многооборотных подстроечных резистора номиналом 10 кОм. Благодаря этому из него можно сделать скромный лабораторный блок питания, нужно только добавить блок питания и вольтамперметр, к примеру DSN-VC288. Также существует специальный вольтамперметр для этого модуля. XL4015 чем то напоминает LM2596, но имеет встроенный полевой транзистор, а так же выходной ток больше — до 5А.
XL4015 имеет КПД до 96%, мощность в нагрузке 75ВТ, при максимальном токе 5А. Питается модуль от 8В до 38В, выходное напряжение от 1.25В до 36В. В микросхеме есть защита от короткого замыкания (лимит тока 8 А), защита от перегрева — автоматическое отключение выхода при превышении рабочей температуры. Защита по входу от переполюсовки нет, но можно подключить по входу диод или диодный мост.
Благодаря регулируемому току этот модуль (драйвер) можно использовать для зарядки литий-ионных аккумуляторов, питания светодиодных лент, блок питания с стабилизацией тока и так далее.
Технические характеристики преобразователя XL4015
- Эффективность преобразования (КПД): до 96%;
- Частота переключения: 180 кГц;
- Рабочая температура: от -40 до + 85 °C;
- Входное напряжение: 8-36 В;
- Выходное напряжение: 1.25-32 В (регулируемое);
- Выходной ток: регулируемый до максимального значения 5 А;
- Выходная мощность: 75 Вт;
- Защита: от короткого замыкания, от перегрева, ограничение выходного тока;
- Защита от переполюсовки: нет;
- Размер: 26 x 62 x 16 мм;
Принципиальная схема модуля XL4015
Ниже приведена принципиальная схема преобразователя — модуля на базе XL4005, а не XL4015. В плане выходного тока и КПД XL4005 и XL4015 идентичны. Основное различие в рабочей частоте (300кГц. для XL4005 и 180кГц. для XL4015), что позволяет использовать для XL4005 дроссель меньшей индуктивности (читай меньшего размера), и в небольшой разнице максимального входного напряжения (32В. для XL4005 и 36В. для XL4015).
Ещё XL4005 отличается более низким опорным напряжением (0,8В. вместо 1,25В. у XL4015), что делает её более предпочтительной для использования в схемах стабилизатора тока (драйвера для мощных светодиодов например).
На сдвоенном операционном усилителе LM358 собрана схема регулируемого токоограничения и компаратор для индикации окончания заряда. В качестве датчика тока применён шунт на базе резистора SMD 2512 0,05Ом. Резистор припаян с обратной стороны модуля.
Отдельно стоящий красный светодиод (R) показывает работу в режиме ограничения тока. Синий светодиод (B) показывает режим заряда аккумулятора (ток больше 10% от уставки), зелёный (или красный) рядом с ним (G) — режим окончания заряда (уменьшение тока до 10% от уставки).
Схема подключения XL4015 DC-DC преобразователя
Для подсоединения питания и нагрузки есть 4 зажима на винтах и/или места для пайки.
Напряжение подается на контакты модуля +IN, –IN (плюс и минус соответственно), а выходное напряжение снимается с выходных контактов +OUT и -OUT.
Материалы
xl4015_datasheet.pdf
Понижающий преобразователь XL 4015
Понижающий преобразователь с токограничением или зарядка на 5А
Тест XL4005 почти лабораторный блок питания
Где купить инструкцию и документацию на Ардуино уно R3 в Тюмени???
Ваш вопрос не совсем понятен.
В поисковике любом. Или проще на YouTube поищи «Arduino для начинающих»
78L05 — максимальное напряжение на входе 20 вольт.
Почему на входе платы пишут 36 вольт ?
Не 20 вольт, а 30. Хотя 36 она не выдержит…
4-й вывод подключается куда-то или нет ?
Тут имеется ввиду то, что можно паять кабеля или использовать клеммные блоки
Админ, я не понял. Как присоединять, всем понятно. Вопрос был не про это. 4-я нога висит в воздухе, а конкретнее, выведена возле входного клеммника. А дальше ? Надо присоединять, или нет ? По даташиту должна через емкость на плюс питания.
Я точно не скажу, но мне кажется, что на данной плате этот конденсатор можно паять, на входе есть два отверстия под него. Почему он не идёт с завода — я не знаю.
Я знаю. Точнее догадываюсь. Это унифицированная плата — она и для XL4005 разводилась. А на 4005-ой 4-я нога управляет включением чипа. На плате нераспаян «выключатель». Но он — для 4005. А для 4015 там ДОЛЖЕН быть конденсатор для внутреннего ИОН. По даташиту. 1мкФ. Почему не напаяли — либо сэкономили, либо он на эти площадки тупо не попадает при пайке — поленились переразводить.
1 мкф нужно впаять, китайцы сэкономили просто. Не знаю, сильно ли его отсутствие влияет на работу…
ПС: 1 мкф впаять не в отверстия для выключения, а по схеме из даташита.
Привет,скажите плиз,зачем эти отверстия около клемы под что они? И какое напряжение идёт на светодиоды? 3мм можно поставить?
Подскажете пож. В плате врет амперметр- показания завышены в два раза, могет заменить R 050 ?
Можете нарисовать,куда впаять этот кондёр?не умею читать схемы..
на входе 12в
поставил на холостом ходу 5,00в
нагрузка 1А — 4,2в
нагрузка 2,5А — 3,6в
короче вообще нагрузку не держит
Плата показывает при установке платы с U/I завышенный ток в 2 раза , как занизить показания амперметра ? Что поставить вместо R050?
Плата выдает завышенный ток на амперметр,как увеличить показания тока в два раза?
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