Datasheet

ADP1048-600-EVALZ PRD 1363
Rev. 1.3 | Page 3 of 26
TOPOLOGY AND CIRCUIT DESCRIPTION
This evaluation board features the ADP1048 in a typical AC/DC switching power supply in an interleaved boost power factor
correction (PFC) topology. The circuit is designed to provide a rated load of 385V/600W from an AC input voltage source of 85
V
RMS
to 265 V
RMS
AC. The ADP1048 provides functions all the functions necessary for active PFC circuit plus accurate AC
power metering. It achieves near-unity power factor, low distortion of the input current, the output voltage regulation, over
current protection, AC line fault detection and protection, over temperature protection, and power supply shutdown. It also can
optimize light load efficiency performance using output voltage adjustment and frequency reduction.
Please refer to the appendix for the detailed schematic. The AC input side consists of the input terminals, EMI filter, inrush
relay and its control circuit. The D1 is the rectifier bridge for main power transmission. The D4 is used for input voltage
sensing. The boost circuit consists boost inductor (L2), boost switch (Q1) and diode (D2). The gate signal for the boost switch
comes from the ADP1048 through the ADP3634 gate driver. The ADP1048 (U1, on daughter card) can be powered either via
the USB 5V via an ADP3303 LDO (U2, on daughter card) present on the same daughter card, or via the auxiliary power supply
on the board. Thermistor (RTD1) is placed close to the MOSFET on the board allowing over temperature protection
functionality to be implemented.
CONNECTORS
The connections to the evaluation board are shown below.
Connector Evaluation Board Function
J1 AC Input
J9, J10 AC Input
J4 385V DC Voltage Output
J5
Ground Return for 385 V DC Voltage
Output
J8, J11 I2C Connector
J6 Daughter card
Table 2 - Evaluation board connectors
There is a 4 pin connector for I2C communication. This allows the software to communicate with the evaluation board through
the USB port of the PC. Connectors (J8 and J11) are identical and are connected in parallel to each other to allow multiple
boards to be connected to the same I2C bus in a daisy chain configuration.