ADUM5202CRWZ Analog Devices Inc, ADUM5202CRWZ Datasheet - Page 21

• Manufacturer Part Number: ADUM5202CRWZ
• Description: DUAL-CHANNEL ISOLATOR W/INTEGRATED DC/DC
• Manufacturer: Analog Devices Inc
• Series: IsoPower®, iCoupler®r

Specifications of ADUM5202CRWZ

• Inputs - Side 1/side 2: 0/2
• Number Of Channels: 2
• Isolation Rating: 2500Vrms
• Voltage - Supply: 3.3V, 5V
• Data Rate: 25Mbps
• Propagation Delay: 45ns
• Output Type: Logic
• Package / Case: 16-SOIC (0.300", 7.5mm Width)
• Operating Temperature: -40°C ~ 105°C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

POWER CONSIDERATIONS
The ADuM5200/ADuM5201/ADuM5202 power input, data
input channels on the primary side, and data input channels on
the secondary side are all protected from premature operation by
UVLO circuitry. Below the minimum operating voltage, the
power converter holds its oscillator inactive and all input channel
drivers and refresh circuits are idle. Outputs remain in a high
impedance state to prevent transmission of undefined states
during power-up and power-down operations.
During application of power to V
held idle until the UVLO preset voltage is reached. At that time,
the data channels initialize to their default low output state until
they receive data pulses from the secondary side.
When the primary side is above the UVLO threshold, the data input
channels sample their inputs and begin sending encoded pulses to
the inactive secondary output channels. The outputs on the primary
side remain in their default low state because no data comes from
the secondary side inputs until secondary power is established. The
primary side oscillator also begins to operate, transferring power to
the secondary power circuits. The secondary V
UVLO limit at this point; the regulation control signal from the
secondary is not being generated. The primary side power oscillator
is allowed to free run in this circumstance, supplying the maximum
amount of power to the secondary, until the secondary voltage rises
to its regulation setpoint. This creates a large inrush current transient
at V
control circuit produces the regulation control signal that
modulates the oscillator on the primary side. The V
reduced and is then proportional to the load current. The inrush
current is less than the short-circuit current shown in Figure 12.
The duration of the inrush depends on the V
and the current available at the V
As the secondary side converter begins to accept power from the
primary, the V
UVLO is reached, the secondary side outputs are initialized to
their default low state until data is received from the corresponding
primary side input. It can take up to 1 μs after the secondary side
is initialized for the state of the output to correlate with the pri-
mary side input.
Secondary side inputs sample their state and transmit it to the
primary side. Outputs are valid about 1 μs after the secondary
side becomes active.
Because the rate of charge of the secondary side power supply is
dependent on loading conditions, the input voltage, and the
output voltage level selected, take care with the design to allow
the converter sufficient time to stabilize before valid data is
required.
When power is removed from V
and coupler shut down when the UVLO level is reached. The
secondary side stops receiving power and starts to discharge. The
outputs on the secondary side hold the last state that they received
from the primary side. Either the UVLO level is reached and the
DD1
. When the regulation point is reached, the regulation
ISO
voltage starts to rise. When the secondary side
DD1
DD1
DD1
, the primary side converter
, the primary side circuitry is
pin.
ISO
ISO
loading conditions
voltage is below its
DD1
current is
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outputs are placed in their high impedance state, or the outputs
detect a lack of activity from the primary side inputs and the
outputs are set to their default low value before the secondary
power reaches UVLO.
THERMAL ANALYSIS
The ADuM520x consists of four internal die, attached to a split
lead frame with two die attach paddles. For the purposes of
thermal analysis, it is treated as a thermal unit with the highest
junction temperature reflected in the θ
value of θ
mounted on a JEDEC standard 4-layer board with fine width
traces and still air. Under normal operating conditions, the
ADuM520x operates at full load across the full temperature
range without derating the output current. However, following
the recommendations in the PCB Layout section decreases the
thermal resistance to the PCB allowing increased thermal margin
at high ambient temperatures.
INCREASING AVAILABLE POWER
The ADuM520x devices are designed with the capability of
running in combination with other compatible isoPower
devices. The RC
receive a PWM signal from another device through the RC
pin and act as a slave to that control signal. The RC
chooses whether the part acts as a standalone self-regulated
device or a slave device. When the ADuM520x is acting as a
slave, its power is regulated by a PWM signal coming from a
master device. This allows multiple isoPower parts to be
combined in parallel while sharing the load equally. When the
ADuM520x is configured as a standalone unit, it generates its
own PWM feedback signal to regulate itself.
The ADuM5000 can act as a master or a slave device, the
ADuM5401, ADuM5402, ADuM5403, and ADuM5404 can
only be master/standalone, and the ADuM520x can only be a
slave/standalone device. This means that the ADuM5000,
ADuM520x, and ADuM5401 to ADuM5404 can only be used
in certain master/slave combinations as listed in Table 14.
Table 14. Allowed Combinations of isoPower Parts
Master
ADuM5000
ADuM520x
ADuM5401 to
ADuM5404
The allowed combinations of master and slave configured parts
listed in Table 14 is sufficient to make any combination of power
and channel count.
Table 15 illustrates how isoPower devices can provide many
combinations of data channel count and multiples of the single
unit power.
ADuM5200/ADuM5201/ADuM5202
JA
is based on measurements taken with the part
IN
ADuM5000
Yes
No
Yes
and RC
SEL
pins allow the ADuM520x to
ADuM520x
Yes
No
Yes
Slave
JA
from Table 3. The
ADuM5401 to
ADuM5404
No
No
No
SEL
pin
IN