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| 型号： | ADP1046DC1-EVALZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 4/48页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL DAUGHTERCARD ADP1046 |
| 标准包装： | 1 |
| 主要目的： | 电源管理，电源监控器/跟踪器/序列发生器 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | ADP1046 |
| 次要属性： | I²C 接口 |
| 已供物品： | 板 |
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UG-320
TOPOLOGY AND CIRCUIT DESCRIPTION
This user guide describes the ADP1046 in a typical dc-to-dc
switching power supply in an interleaved two-switch forward
show the schematics of the main power stage and the peripheral
connections, respectively. The daughter card schematic is shown in
25 A from an input voltage source of 350 V dc to 400 V dc. The
ADP1046 is used to provide functions such as output voltage
regulation, output overcurrent protection, primary cycle-by-
cycle protection, load current sharing with multiple power
supplies over the share bus, and overtemperature protection.
The interleaved two-switch forward topology is essentially two
two-switch forward designs running 180 degrees out of phase in
parallel with each other.
The primary side consists of the input terminals (J1, J2), switches
(Q1/Q2 for Phase 1, Q3/Q4 for Phase 2), the current sense
transformer (T3 for Phase 1 and T4 for Phase 2) and the main
power transformer (T1 for Phase 1 and T2 for Phase 2). The
ADP1046 (U1 on the daughter card) resides on the secondary
side and is powered via the USB 5 V with an ADP3303LDO
(U2 on the daughter card) present on the same daughter card.
The gate signal for the primary switches comes from the ADP1046
through the MOSFET driver (U1) and passes through pulse
transformers (T5 for Phase 1 and T6 for Phase 2). Diodes
(D1/D2 for Phase 1 and D3/D4 for Phase 2) are responsible for
circulating the magnetizing current of the transformer through
the dc source during the off period of the switch and for
clamping the maximum output voltage. C1 and C21 act as
decoupling capacitors, and Y capacitors (C67, C68) reduce
common-mode noise.
The secondary side power stage consists of the synchronous
rectifiers (Q5 for Phase 1 and Q6 for Phase 2) and freewheeling
FETs (Q7 for Phase 1 and Q9 for Phase 2). The RC series
connections (R2/C2, R4/C4, R25/C22, R3/C3) act as snubbers
for these FETs. The secondary-side FETs are driven by U2 and
U3, which are 4 A drivers with a UVLO of 4.2 V (typical). Also
present on the secondary side are the output filter inductors (L1
for Phase 1 and L2 for Phase 2) and the output capacitors (C10
and C8) placed before the OrFET (Q8, Q10). Capacitors (C15,
C16) provide high frequency decoupling to lower EMI.
The OrFETs are driven by a diode (D7) and a capacitor (C13)
that form a peak detector on the switch node of the transformer.
Evaluation Board User Guide
The OrFET turn-off is through the GATE pin connected to the
FET (Q14) that pulls the gate of the OrFET low, turning it off.
The output load current is sensed using resistors (R5, R8).
Alternatively, they can also be replaced by using the Rds_on of
the OrFETs (open R26 and R16, and short R38 and R39 with
5.5 k?/0.01% Resistors R3 and R4 on the daughter card). The
output voltage is sensed at VS1 and VS2 for OrFET control and
V OUT for output load regulation. Jumpers (J18, J20) can be used
for remote sensing.
The primary current is sensed through the CS1 pin. A Zener
diode (D17) protects the pin from exceeding its absolute maxi-
mum rating. A thermistor (RTD1) is placed on the secondary
side between Q7 and Q9 and acts as thermal protection for the
power supply. A 20 k? resistor is placed in parallel with the
thermistor that allows the software GUI to read the temperature
directly in degrees Celsius.
The ADP1046 also features a line feedforward functionality.
The switch node on the secondary side of the transformer (T1)
is filtered through an RCD filter (R56, C25, D10), and a fraction
of the voltage is fed into the ACSNS pin.
Also present on the secondary side is the current sharing
circuitry, flag LEDs (D11 to D12), and the communications
port to the software through the I 2 C bus. There is a 4-pin
connector for I 2 C communication. This allows the PC software
to communicate with the evaluation board (and with other
evaluation boards through the extra 4-pin connectors) through
the USB port of the PC. The user can easily change register
settings on the ADP1046 and monitor the status registers. It is
recommended that the USB dongle be connected directly to the
PC, not via the external hub.
Instead of using an auxiliary supply, the board uses an on-board
boost converter that converts the 5 V from the USB to the 12 V
that powers the MOSFET drivers. Alternatively, an external
12 V connector (J6) is also present. During normal operation,
the drivers are powered from the main 12 V output after the
output is in regulation. The 5 V is input from the USB port and
The board also has a connector for a fan capable of driving
~12 V/300 mA from the main 12 V output terminal. The fan is
driven by the OUTAUX PWM signal and is duty cycle modu-
lated, providing maximum speed at maximum load.
Rev. A | Page 4 of 48
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