EYRS1 Series 9 – 36V Input Eighth Brick Converters
Datasheet EYRS1 Series 12-16-2016 5
shown in Figure2. To increase the output
voltage, the value of the resistor should be:
))(.
.)(.
(
k
Vo
Rup 2210
511
2251100115
Where
Vo = Typical Output Voltage
Figure 1.Circuit to Decrease Output Voltage
Figure 2.Circuit to Increase Output Voltage
Output Over-Current Protection (OCP)
This converter can be ordered in either latch-off
or auto-restart version upon OCP, OVP, and
OTP.
With the latch-off version, the converter will
latch off when the load current exceeds the limit.
The converter can be restarted by toggling the
ON/OFF switch or recycling the input voltage.
With the auto-restart version, the converter will
operate in a hiccup mode (repeatedly try to
restart) until the cause of the over-current
condition is cleared.
Output Over-Voltage Protection (OVP)
With the latch-off version, the converter will
latch off when the output voltage exceeds the
limit. The converter can be restarted by toggling
the ON/OFF switch or recycling the input
voltage.
With the auto-restart version, the converter will
operate in a hiccup mode (repeatedly try to
restart) until the cause of the over-voltage
condition is cleared.
Over Temperature Protection (OTP)
With the latch-off version, the converter will shut
down and latch off if an over-temperature
condition is detected. The converter has a
temperature sensor located at a carefully
selected position in the converter circuit board,
which represents the thermal condition of key
components of the converter. The thermal
shutdown circuit is designed to turn the
converter off when the temperature at the
sensor reaches 120°C. The module can be
restarted by toggling the ON/OFF switch or
recycling the input voltage.
With the auto-restart version, the converter will
resume operation after the converter cools
down.
Design Considerations
As with any DC/DC converter, the stability of the
EYRS1 converters may be compromised if the
source impedance is too high or inductive. It’s
desirable to keep the input source ac-
impedance as low as possible. Although the
converters are designed to be stable without
adding external input capacitors for typical
source impedance, it is recommended to add
220 F low ESR electrolytic capacitors at the
input of the converter for each 100W output
power, which reduces the potential negative
impact of the source impedance on the
converter stability. These electrolytic capacitors
should have sufficient RMS current rating over
the operating temperature range.
The converter is designed to be stable without
additional output capacitors. To further reduce
the output voltage ripple or improve the
transient response, additional output capacitors
are often used in applications. When additional
output capacitors are used, a combination of
ceramic capacitors and tantalum/polymer
capacitors shall be used to provide good filtering
while assuring the stability of the converter.
Vo(+)
Vo()
SENSE(+)
SENSE(-)
TRIM
Load
Rdown
Vo(+)
Vo()
SENSE(+)
SENSE(-)
TRIM
Rup
Load