ADP1870-BL2-EVZ

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The ADP1870-BL2-EVZ evaluation board is a switching AC/DC power supply module designed to support the ADP1870 constant current/constant voltage (CC/CV) boost controller. CC/CV boosting is typically used in battery-charging applications that require a regulated and limited current or voltage output. The board operates with either an external or internal switching frequency from 200 kHz to 2.3 MHz, allowing flexibility to optimize core size, switch frequency ripple, and stability. It is also capable of being operated in burst mode or pulse frequency modulation (PFM) mode to improve efficiency.

The board includes components and circuitry for over-voltage protection, current-sense protection, and output voltage regulation. It also includes integrated system-level diagnostics with feedback to the host processor. This allows the host processor to better manage the system when the device is in any state of operation.

The components and circuitry used in the board are designed for a wide input voltage range, from 85 VAC to 277 VAC. The output voltage is adjustable, with a range from 8 V to 36 V. The output current can be monitored and adjusted as necessary. The output power rating is 70 W.

The ADP1870-BL2-EVZ evaluation board consists of the following components:

• ADP1870 boost controller
• Transformer
• Primary-side EMI filter
• PFC controller
• Output rectifiers
• Output filter

The board\'s design is based on an active power factor correction (PFC) design, which allows it to independently adjust the energy delivered to the load. This makes it more efficient than conventional switching AC/DC power supplies. The board is capable of providing a peak power of more than 100 W, and is designed to meet harmonic requirements in accordance with EN 61000-3-2.

The PFC controller includes a pulse-width modulated (PWM) controller and an adaptive dead-time controller (ADTC). The PWM controller senses the input voltage and regulates the output current to keep the power factor (PF) constant. The ADTC adjusts the dead-time of the switching devices in order to eliminate the effect of power factor droop. By eliminating power factor droop, the power supply can be operated closer to the steady-state maximum efficiency.

The primary-side EMI filter provides additional input EMI protection for the controller and the load. The output filter included in the board provides additional protection against conducted emissions, as well as complying with the requirements of EN 55011 Class B and EN 61000-3-2.

The ADP1870-BL2-EVZ evaluation board is suitable for a wide variety of applications, including battery-charging and power supply systems for consumer electronics, industrial and office equipment, medical device, and lighting equipment. It can also be used in applications where a combination of constant current and constant voltage output is required.

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