Nguyên lý hoạt động của TL431 trong các mạch nguồn xung

Nguyên lý hoạt động của TL431 trong các mạch nguồn xung

Ứng dụng TL431 trong các mạch nguồn xung

Cách thức hoạt động

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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