MSK5976RH M. S Kennedy, MSK5976RH Datasheet - Page 3

• Manufacturer Part Number: MSK5976RH
• Description: Rad Hard Positive, 1.0 Amp, Single Resistor Adj Voltage Regulator
• Manufacturer: M. S Kennedy

OUTPUT VOLTAGE
ates the reference voltage for the internal Error Amplifier.
The MSK 5976RH SET pin supplies a constant current of
10uA that develops the reference voltage. The output
voltage is simply Rset x 10uA. Since the output is inter-
nally driven by a unity-gain amplifier, an alternative to
using Rset is to connect a high quality reference source to
the SET pin. With a minimum load requirement of 1mA on
the Output, the Output Voltage can be adjusted to near
0V. To bring the output voltage to 0V, the load must be
connected to a slightly negative voltage supply to sink
the 1mA minimum load current from a 0V output.
OUTPUT CAPACITANCE
mum output capacitor of 2.2µF with an ESR of 0.5
less. Tantalum or ceramic capacitors are recommended. A
larger capacitance value will improve transient response
for increased load current changes. Consideration must also
be given to temperature characteristics of the capacitors
used.
ADDITIONAL STABILITY
ground, will improve the output transient response and
filter noise in the system. To reduce output noise, typi-
cally less than 100pF is all that will be required. Capaci-
tors up to 1µF can be used, however consideration must
be given to the effect the time constant created will have
on the startup time.
For stability purposes, the MSK 5976RH requires a mini-
A capacitor placed in parallel with the SET pin resistor to
A single resistor (Rset) from the SET pin to ground cre-
APPLICATION NOTES
FIGURE 1
or
3
5976RH's may be paralleled to multiply the current capacity. As
shown in Figure 3, the Vin and SET pins must be tied together.
The Vout pins are connected to the load with consideration to
the conductor resistance. The conductor resistance of each MSK
5976RH Vout connection to the load, must be equal to create
equal load sharing. As little as 10m ballast resistance typically
ensures better than 80% equal sharing of load current at full
load. Additional consideration must be given to the effect the
additional Vout conductor resistance has on load regulation; see
paragraph titled "Load Regulation".
LOAD REGULATION
therefore the parasitic resistance of the system must be consid-
ered to design an acceptable load regulation. The overall load
regulation includes the specified MSK 5976RH load regulation
plus the parasitic resistance multiplied by the load current as
shown in Figure 2. R
between the MSK 5976RH output and the load. It will directly
increase output load regulation error by a voltage drop of
Rso. Rss is the series resistance between the set pin and the
load. R
trace is connected as close to the load as possible keeping the
load return current on a separate trace as shown. R
series resistance of all of the conductors between the load and
the input power source return. R
if the set pin is connected with a Kelvin Sense type connection
as shown in Figure 2, but it will increase the effective dropout
voltage by a factor of I
possible will ensure minimal voltage drops and wasted power.
PARALLELING DEVICES
The MSK 5976RH specified load regulation is Kelvin Sensed,
When currents greater than 1.0 A are needed, the MSK
SS
will have little effect on load regulation if the set pin
SO
O
is the series resistance of all conductors
x R
FIGURE 2
FIGURE 3
SR.
SR
Keeping R
PRELIMINARY Rev. A 8/09
will not effect load regulation
SO
and R
SR
as low as
SR
is the
Io x