BA6104 Five-digit LED level meter driver IC Basic Application Circuit

BA6104 is a five-digit LED level meter driver integrated circuit (IC) that features a basic application circuit. The input stage employs a PNP transistor with a composite base input, resulting in high input impedance. The output stage is configured as an emitter follower, allowing for adjustment of the LED drive current through an external resistor (RL). An external resistor connected to pin 7 can modify the reference voltage (Vref). When pin 7 is left open, the reference voltage is internally controlled by the IC, with a typical value of approximately 1V. To display levels below 1V on the LED, a resistor (RD) should be connected from pin 7 to ground, reducing Vref. Conversely, to display levels above 1V, a resistor (R) should be connected from pin 7 to the power supply (Vcc), causing Vref to increase according to the relationship: Vref = [Vcc + 0.75R (kΩ)] / [0.75R (kΩ) + 1].

The BA6104 integrated circuit is designed for use in applications requiring precise level indication through a five-digit LED display. The high input impedance at the input stage, facilitated by the PNP transistor configuration, ensures minimal loading on the signal source, which is crucial for accurate level measurements. The emitter follower output stage provides a low output impedance, making it suitable for driving the LEDs directly.

The adjustment of the LED drive current via the external resistor (RL) allows for flexibility in display brightness and power consumption, accommodating varying application requirements. The ability to modify the reference voltage (Vref) through the external resistor connected to pin 7 enhances the versatility of the BA6104, enabling it to cater to different display thresholds.

When configuring the circuit, it is essential to consider the relationship between Vref and the resistors connected to pin 7. The formula for Vref indicates that the reference voltage can be finely tuned based on the values of the resistors used. This adaptability allows designers to set the LED display to activate at specific input levels, which can be critical in applications such as audio level monitoring, signal strength indication, or other scenarios where precise level visualization is necessary.

In summary, the BA6104 offers a robust solution for LED level indication with its high input impedance, configurable output stage, and adjustable reference voltage, making it an ideal choice for various electronic measurement and display applications. Proper implementation of the circuit, including careful selection of external resistors, will ensure optimal performance and accuracy in level detection. BA6104 Five-digit LED level meter driver IC basic application circuit BA6104 Since the input stage that uses a PNP transistor base composite input, so the input impedance is hi gh. The output stage emitter follower form, adjust the figure LED external resistor RL, can change the LED drive current. A 7-pin external resistor can change Vref, when the 7 foot open, the reference voltage Vref by the IC internal controls, and its value is approximately 1V.

If the requirements LED display when the level is below 1V, just a resistor of indirect RD 7 feet of the ground, you can reduce Vref, as shown in; if the level is higher than required to display 1V, only 7 feet in the power supply Vcc indirect a resistance R, the Vref will rise to their relationship as: Vref [Vcc + 0.75R (k )]]/[0.75R (k ) +1].