Page 2 - MPD MSR7805W Datasheet
P. 2



Model Selection Guide www.micropowerdirect.com

Input Voltage (VDC) Output Effi ciency (%, Typ) Capacitive
Model
Number Voltage Current Load
Nom. Range Min VIN Max VIN (µF, Max)
(VDC) (mA, Max)
MSR7805-033W 24 4.75 - 36.0 3.3 500.0 86 80 680
24 6.50 - 36.0 5.0 500.0 90 84 680
MSR7805-05W
12 7.00 - 31.0 -5.0 -500.0 80 81 330
MSR7805-09W 24 12.0 - 36.0 9.0 500.0 93 90 680
24 15.0 - 36.0 12.0 500.0 94 91 680
MSR7805-12W
12 8.00 - 24.0 -12.0 -150.0 84 85 330
24 19.0 - 36.0 15.0 500.0 95 93 680
MSR7805-15W
12 8.00 - 21.0 -15.0 -150.0 85 87 330
Notes: Derating Curve
1. For many applications, no external components are required. If the input is over 30V, a 22 µF/50V
input capacitor (C1) is required. See the typical application note below.
2. Output ripple is measured with a nominal input and is specifi ed for a load range of 10% to 100%.
When measuring output ripple, two external capacitors (1 µF and 10 µF) must be placed from the VOUT to
the Gnd pins.
3. Transient recovery is measured to within a 1% error band for a load step change of 75% to 100%.
4. The unit may not meet emissions to class A without the addition of external capacitors (C1, C3 &
C4) as shown in the typical circuit 4 diagram on page 4.
5. The unit meets EFT & surge EMS specifi cations with the addition of external components as
shown in the typical circuit 4 diagram on page 4.
6. Soldering temperature is measured 1.5 mm from the pins. Soldering time should not exceed 10S.
7. This regulator is not designed to be used in parallel with another unit to increase output power.
8. A reverse polarity connection on the input could damage the unit.
9. The input should not exceed the range given in the model selection chart. Exceeding this limit
could damage the unit.
10. It is recommended that an external fuse be used. The fuse should be selected based upon the actual input
current of the application. For more information please call the factory.





Typical Application Circuit 1, Positive Output
For many applications, the MSR7805-xxW can be
used without external components. However, if the
application requires meeting EMC/EMI standards
or operation at inputs over 30V, a minimum of
external components is needed.
A typical connection (for a positive output voltage)
is shown at right. Here, C1 has been added to
improve stability over the input range (and over
the operating temperature range). Capacitor C2
is added to reduce the output ripple.
Suggested values for these capacitors are given
in the “Component Values” table below. These
capacitors are ceramic and should be placed as
close to the unit as possible. Tantalum or low ESR
electrolytic capacitors may also be used.
Typical Application Circuit 2, Negative Output
If very low noise is required, an LC fi lter may be
added to the output. For suggested component
values contact the factory. To meet EMI standards,
see the typical circuit 4 diagram on page 4.

Model
Number C1 C2
MSR7805-033W 10 µF/50V 22 µF/10V
MSR7805-05W 10 µF/50V 22 µF/10V
MSR7805-09W 10 µF/50V 22 µF/16V
MSR7805-12W 10 µF/50V 22 µF/25V
MSR7805-15W 10 µF/50V 22 µF/25V

To produce a negative output, connect the output to pin 2
and ground to pin 3, as shown in the diagram above.

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