AP1682MTR-G1

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PMIC – LED Drivers are used to control and constant luminescent power for LED and are widely used in the market nowadays. The AP1682MTR-G1 buck-boost DC-DC regulator is one of them. This article will discuss the application field and working principle of AP1682MTR-G1.

AP1682MTR-G1 is suitable for powering LED displays, LED strips, LED drivers and other LED based electronic devices. This LED driver adopts synchronous rectification buck-boost topology, which compensates the transition of LED current while the input voltage varies by maintaining the LED VF value. It features wide input voltage range, high efficiency, low output ripple, accuracy and high stability.

The AP1682MTR-G1 has a rated input voltage from 4.5V to 45V and a stable voltage across the whole input voltage range for LED. It provides an extra 5-10V output current for powering other ICs, which does not affect the output current to the LED. The maximum output current for LED is 1.5A and can be adjusted via the EN pin. Its operating frequency is 375KHz, which gives it a high efficiency rate of up to 86% with a large input to output transmission range of 4:1.

Besides the external switch and capacitor, the AP1682MTR-G1 requires no other components, reducing the size in PCB boards significantly. The device offers various protection features as well, such as over-voltage protection (OVP), current limit protection (OCP), voltage limit protection ( VLP) and thermal protection (TP). Users can also further customize their applications by setting the Vout, Iout or temperature via external pins. This makes the AP1682MTR-G1 suitable for various applications.

The working principle of the AP1682MTR-G1 is based on the synchronous buck-boost DC-DC regulator architecture. The adjustable regulator uses a pair of buck and boost converter, whereas each one is driven by one of the two control signals. The control signals set the switch duty cycles for each converter, for example, when the buck converter switch is on, the LED current flow is regulated through the inductor and the LED voltage is stabilized. When the boost converter switch is on, the LED voltage continues to increase. During regular operation, the LED current flows from the input to the output, with both the buck and the boost converters being controlled.

The buck-boost converter consists of three main components, the main MOSFET switch, the inductor, and the capacitor. When the switch is turned on, the power stored in the inductor is increased. When the switch is turned off, the stored energy is released through the LED and the capacitor. The amount of power released through the LED is determined by the duty cycle, which is set by the control signals. The polarity of the inductor and the capacitor are then reversed, charging the capacitor and releasing power of the LED.

In summary, AP1682MTR-G1 is an ideal device for LED applications due to its wide input voltage range, low output ripple, now external parts, and high efficiency. Its synchronous buck-boost DC-DC architecture allows for maximum power transfer from the input to the output, providing accurate and consistent voltage output for the LED. With its protection features and external pin options, the AP1682MTR-G1 can be used for multiple applications, including LED displays, LED strips, LED drivers, and other LED based applications.

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