Mình có sở thích sáng tạo điện tử và sửa chữa điện tử. Cửa hàng Linh Kiện Tháo Máy.Com trực tuyến là nơi mà mình bán các sản phẩm đc mình đo đạc kỹ lưỡng để bán cho các bạn chủ yếu là học sinh và sinh viên nghiên cứu. Giá thành sản phẩm lại chỉ bằng 1/2 sản phẩm mới mà chất lượng không bao giờ thua kém.
Sản phẩm của mình luôn tốt hơn đồ China là cái chắc =.=
Nơi mình chia sẽ các kiến thức cơ bản về điện tử, các bài viết và ứng dụng hay và thực tiễn dễ áp dụng lắp ráp cho các bạn thích tìm tòi và khám phá 0_o
RẤT VUI KHI CÁC BẠN ĐÃ TRANH THỦ ĐỌC NHỮNG LỜI ĐẦU VỀ TRANG NÀY
TL431 là mạch so sánh điện áp dùng OPAMP có thể điều chỉnh được.
Điện áp đầu ra được thiết lập ở giá trị bất kỳ trong khoảng 2.5 V đến 36 V với hai điện trở phân áp bên ngoài.
Bình thường nó mở, không thông xuống GND, nhưng nếu điện áp lấy mẫu vượt > 2.5V thì nó đóng thống GND giống như diot zener, rất chính xác.
Lưu ý: Chân REF là cực N
Ứng dụng
Mạch báo chỉ thị áp thấp
Kết nối mạch với nguồn điện phòng thí nghiệm có cực tính chính xác (VBAT = + & GND = GND) và điều chỉnh trimpot (RP1) sao cho cần gạt nước của nó (được kết nối với đầu nối tham chiếu của chip) ở 2,5 V khi đầu vào dc là 3V. Kiểm tra xem chỉ báo màu xanh lam có sáng lên ở giai đoạn này không
Mạch báo chỉ thị điện áp đủ (đầy)
Kết nối mạch với nguồn điện phòng thí nghiệm với cực tính chính xác (VBAT = + & GND = GND) và điều chỉnh trimpot (RP2) để gạt nước của nó ở 2,5 V khi đầu vào một chiều là 4,2V. Kiểm tra xem chỉ báo màu đỏ có sáng lên ở giai đoạn này không
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