Datasheet

Data Sheet ADuM5000
Rev. B | Page 13 of 16
INCREASING AVAILABLE POWER
The ADuM5000 device is designed to work in combination with
other compatible isoPower devices. The RC
OUT
, RC
IN
, and RC
SEL
pins allow the ADuM5000 to provide its PWM signal to another
device through the RC
OUT
pin acting as a master. It can also
receive a PWM signal from another device through its RC
IN
pin
and act as a slave to that control signal. The RC
SEL
pin chooses
whether the part acts as a master or 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 or standalone unit, it
generates its own PWM feedback signal to regulate itself and
slave devices.
The ADuM5000 can function as a master, slave, or standalone
device. All devices in the ADuM5xxx and ADuM6xxx family
can function as standalone devices. Some of these devices also
function as master devices or slave devices, but not both (see
Table 14).
Table 15 shows how isoPower devices can provide many
combinations of data channel count and multiples of the
single unit power.
Table 14. Allowed Combinations of isoPower Parts
Part No.
Function
Master Slave Standalone
ADuM6000 Yes Yes Yes
ADuM620x No Yes Yes
ADuM640x No No Yes
ADuM5000 Yes Yes Yes
ADuM520x No Yes Yes
ADuM5400 No No Yes
ADuM5401 to
ADuM5404
Yes No Yes
Another feature allowed by the RC
SEL
and RC
IN
control architecture
is the ability to completely shut down the oscillator in the dc-to-
dc converter. This places the part in a low power standby mode
and reduces the current draw to a fraction of a milliamp.
When the ADuM5000 is placed in slave mode by driving RC
SEL
low, the oscillator is controlled by RC
IN
. If RC
IN
is held low, the
oscillator is shut down and the part is in low power standby
mode. With no oscillator driving power to the secondary side,
V
ISO
turns off. This mode is useful for applications where an
isolated subsystem may be shut down to conserve power. To
reactivate the power module, drive RC
SEL
high; the power supply
resumes operation.
Table 15. Configurations for Power and Data Channels
Power Units
Number of Data Channels
0 Channels 2 Channels 4 Channels
1-Unit Power
ADuM6000 or ADuM5000 (standalone) ADuM620x or ADuM520x (standalone)
ADuM5401, ADuM5402, ADuM5403,
ADuM5404, or ADuM640x (standalone)
2-Unit Power
ADuM6000 or ADuM5000 (master)
ADuM6000 or ADuM5000 (slave)
ADuM6000 or ADuM5000 (master)
ADuM620x or ADuM520x (slave)
ADuM5401, ADuM5402, ADuM5403,
ADuM5404 (master)
ADuM6000 or ADuM5000 (slave)
3-Unit Power
ADuM6000 or ADuM5000 (master) ADuM6000 or ADuM5000 (master) ADuM6000 or ADuM5000 (master)
ADuM6000 or ADuM5000 (slave) ADuM6000 or ADuM5000 (slave) ADuM620x or ADuM520x (slave)
ADuM6000 or ADuM5000 (slave) ADuM620x or ADuM520x (slave) ADuM620x or ADuM520x (slave)