ADUM5202CRWZ Analog Devices Inc, ADUM5202CRWZ Datasheet - Page 20

• 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

ADuM5200/ADuM5201/ADuM5202
voltages sufficiently large enough to trigger the thresholds of
succeeding circuitry. Exercise care in the layout of such traces
to avoid this possibility.
POWER CONSUMPTION
The V
data channels as well as to the power converter. For this reason,
the quiescent currents drawn by the data converter and the
primary and secondary input/output channels cannot be
determined separately. All of these quiescent power demands
have been combined into the I
The total I
current, dynamic current I
and any external I
Both dynamic input and output current is consumed only when
operating at channel speeds higher than the rate of f
each channel has a dynamic current determined by its data rate,
Figure 17 shows the current for a channel in the forward direction,
which means that the input is on the primary side of the part.
Figure 18 shows the current for a channel in the reverse direction,
which means that the input is on the secondary side of the part.
Both figures assume a typical 15 pF load. The following relation-
ship allows the total I
where :
I
I
Figure 17 or Figure 18, depending on channel direction.
I
E is the power supply efficiency at 100 mA load from Figure 9 at
the V
Calculate the maximum external load by subtracting the
dynamic output load from the maximum allowable load.
where:
I
side load.
I
available at V
I
or output channel, as shown in Figure 17 and Figure 18. Data is
presented assuming a typical 15 pF load
DD1
CHn
ISO
ISO(LOAD)
ISO(MAX)
ISO(D)n
is the current drawn by the secondary side external loads.
is the total supply input current.
is the current drawn by a single channel determined from
I
I
ISO
DD1
ISO(LOAD)
DD1
is the dynamic load current drawn from V
is the maximum external secondary side load current
and V
is the current available to supply an external secondary
I
I
= (I
DD1(Q)
DD1(D)
power supply input provides power to the iCoupler
Figure 25. Power Consumption Within the ADuM520x
DD1
ISO
= I
ISO
supply current is the sum of the quiescent operating
DD1
× V
.
ISO(MAX)
I
DDP(D)
CONVERTER
condition of interest.
ISO
2-CHANNEL
PRIMARY
PRIMARY
ISO
DATA I/O
load.
)/(E × V
DD1
− ∑ I
current to be calculated:
DD1(D)
ISO(D)n
DD1
DD1(Q)
E
) + ∑ I
demanded by the I/O channels,
; n = 1 to 4
current shown in Figure 25.
SECONDARY
I
SECONDARY
CONVERTER
ISO(D)
2-CHANNEL
DATA I/O
CHn
; n = 1 to 4
ISO
I
ISO
by an input
r
. Because
Rev. 0 | Page 20 of 24
(1)
(2)
The preceding analysis assumes a 15 pF capacitive load on each
data output. If the capacitive load is larger than 15 pF, the addi-
tional current must be included in the analysis of I
To determine I
output current (I
ondary side dynamic output current (I
per channel basis.
To determine I
output current (I
channel basis.
For each output channel with C
additional capacitive supply current is given by
where:
C
V
f is the input logic signal frequency (MHz); it is half of the input
data rate expressed in units of Mbps.
f
CURRENT LIMIT AND THERMAL OVERLOAD
PROTECTION
The ADuM520x 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 am-
bient 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 temper-
ature drops below 130°C (typical), the PWM turns on again,
restoring the output current to its nominal value.
Consider the case where a hard short from V
occurs. At first, the ADuM520x reaches its maximum current,
which is proportional to the voltage applied at V
dissipates on the primary side of the converter (see Figure 12).
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 dissipates again on the primary side
of the converter, causing the junction temperature to rise to
150°C again. This thermal oscillation between 130°C and 150°C
causes the part to cycle on and off 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,
externally limit device power dissipation to prevent junction
temperatures from exceeding 130°C.
r
L
ISO
is the input channel refresh rate (Mbps).
is the output load capacitance (pF).
is the output supply voltage (V).
I
AOD
= 0.5 × 10
DD1
ISO(LOAD)
AOD
AOD
in Equation 1, additional primary side dynamic
−3
) is added directly to I
) is subtracted from I
× (C
in Equation 2, additional secondary side
L
− 15) × V
L
greater than 15 pF, the
ISO
AOD
) × (2f − f
ISO(MAX)
) is added to I
DD1
. Additional sec-
ISO
DD1
to ground
on a per
DD1
r
) f > 0.5 f
and I
. Power
ISO
ISO(LOAD)
on a
r
(3)
.