ADUM5200ARWZ1 AD [Analog Devices], ADUM5200ARWZ1 Datasheet - Page 13

• Manufacturer Part Number: ADUM5200ARWZ1
• Description: Isolated DC/DC Converter
• Manufacturer: AD [Analog Devices]

Preliminary Technical Data
The ADuM5000 is protected against damage due to excessive
power dissipation by thermal overload protection circuits.
Thermal overload protection limits the junction temperature to
a maximum of 150°C (typical). Under extreme conditions (that
is, high ambient temperature and power dissipation) when the
junction temperature starts to rise above 150°C, the PWM is
turned off, reducing the output current to zero. When the
junction temperature drops below 130°C (typical), the PWM is
turned on again and output current is restored to its nominal
value.
Consider the case where a hard short from V
occurs. At first, the ADuM5000 reaches its maximum current,
which is proportional to the voltage applied at V
dissipated in the primary (see Error! Reference source not
found.). If self-heating of the junction becomes great enough
to cause its temperature to rise above 150°C, thermal
shutdown activates, turning off the PWM and reducing the
output current to zero. As the junction temperature cools and
drops below 130°C, the PWM turns on and power is again
dissipated in the primary, again causing the junction
temperature to rise above 150°C. This thermal oscillation
between 130°C and 150°C causes a current oscillation that
continues as long as the short remains at the output.
Thermal limit protections are intended to protect the device
against accidental overload conditions. For reliable operation,
device power dissipation should be externally limited so
junction temperatures do not exceed 130°C.
POWER CONSIDERATIONS
The ADuM5000 Converter Primary side, is protected from
premature operation by Under Voltage Lock Out (UVLO)
circuitry. Below the minimum operating voltage, the power
converter holds its oscillator inactive.
INCREASING AVAILABLE POWER
The ADuM5000 devices are designed with capability of running
in combination with other compatible isoPower devices. The
RC
PWM signal to another device through the RC
a master. It can also receive a PWM signal from another device
through the RC
The RC
slave device. When the ADuM5000 is acting as a slave, its
power is regulated by the master device allowing multiple
isoPower parts to be combined in parallel while sharing the
load equally. When the ADuM5000 is configured as a
Master/Stand alone unit, it generates its own PWM feedback
signal to regulate itself and slave devices.
The ADuM5000 can act as a master or a slave deice, the
ADuM5400 can only be a master/stand alone, and the
ADuM5200 can only be a slave/Stand alone device. This means
OUT
RC
SEL
IN
pin chooses whether the part will act as a master or
and RC
IN
pin and act as a slave to that control signal.
SEL
pins allow the ADuM5000 to provide its
ISO
OUT
to ground
DD1.
pin acting as
Power is
Rev. PrA | Page 13 of 15
that the ADuM5000, ADuM5200, and ADuM5400 can only be
used in certain master slave combinations as listed in Table 13.
The allowed combinations of master and slave configured parts
listed in Table 13 is sufficient to make any combination of
power and channel count. Table 14 illustrates how isoPower
devices can provide many combinations of data channel count
and multiples of the single unit power.
INSULATION LIFETIME
All insulation structures will eventually break down when
subjected to voltage stress over a sufficiently long period. The
rate of insulation degradation is dependant on the
characteristics of the voltage waveform applied across the
insulation. In addition to the testing performed by the
regulatory agencies, Analog Devices carries out an extensive set
of evaluations to determine the lifetime of the insulation
structure within the ADuM5000.
ADI performs accelerated life testing using voltage levels higher
than the rated continuous working voltage. Acceleration factors
for several operating conditions are determined. These factors
allow calculation of the time to failure at the actual working
voltage. The values shown in Table 10 summarize the peak
voltage for 50 years of service life for a bipolar ac operating
condition, and the maximum CSA/VDE approved working
voltages. In many cases, the approved working voltage is higher
than 50-year service life voltage. Operation at these high
working voltages can lead to shortened insulation life in some
cases.
The insulation lifetime of the ADuM5000 depends on the
Master
Power
Power
Power
1 Unit
2 Unit
3 Unit
Table 14 Configurations for Power and Data Channels
ADuM5000
Master
ADuM5000
Master
ADuM5000
Slave
ADuM5000
Master
ADuM5000
Slave
ADuM5000
Slave
ADuM5000
ADuM5200
ADuM5400
Table 13 Allowed combinations of isoPower Parts
0
ADuM5000
Number of Data Channels
ADuM520x
Master
ADuM500x
Master
ADuM5200
Slave
ADuM5000
Master
ADuM5000
Slave
ADuM520x
Slave
Y
N
Y
2
ADuM5200
ADuM540x
Master
ADuM540x
Master
ADuM5200
Slave
ADuM540x
Master
ADuM5000
Slave
ADuM5000
Slave
Slave
Y
N
Y
4
ADuM5000
ADuM5400
ADuM540x
Master
ADuM12xx
ADuM540x
Master
ADuM520x
Slave
ADuM540x
Master
ADuM520x
Slave
ADuM5000
Slave
N
N
N
6