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HPH Series
Isolated, Low V OUT to 70A, Half-Brick DC/DC Converters
Negative: Optional negative-polarity devices are on (enabled) when the On/Off
+VIN
+VOUT
+SENSE
is grounded or brought to within a low voltage (see Speci?cations) with respect
to –Vin. The device is off (disabled) when the On/Off is pulled high to +Vin with
respect to –Vin.
ON/OFF
CONTROL
TRIM
R TRIM DOWN
LOAD
+VIN
+VCC
–SENSE
–VIN
–VOUT
ON/OFF
CONTROL
R adj_up (in kΩ) = - - 2
Figure 7.Trim adjustments to Decrease Output Voltage using a Fixed Resistor
V nominal x (1+Δ)  1
1.225 x Δ Δ
–VIN
Figure 9. Driving the Negative Polarity On/Off Control Pin
where Δ =
V out - V nominal
V nominal
Dynamic control of the On/Off function should be able to sink appropriate sig-
nal current when brought low and withstand appropriate voltage when brought
R adj_down (in kΩ) =
1
Δ
-2
high. Be aware too that there is a ?nite time in milliseconds (see Speci?cations)
between the time of On/Off Control activation and stable, regulated output. This
V nominal - V out
V nominal
where Δ =
Trim Equations
Where Vref = +1.225 Volts and Δ is the desired output voltage change. Note
that "Δ" is given as a small fraction, not a percentage.
A single resistor connected between Trim and +Sense will increase the output
voltage. A resistor connected between Trim and –Sense will decrease the output.
Remote On/Off Control
On the input side, a remote On/Off Control can be ordered with either polarity.
Positive: Standard models are enabled when the On/Off pin is left open or is
pulled high to +Vin with respect to –Vin. An internal bias current causes the
open pin to rise to +Vin. Some models will also turn on at lower intermediate
voltages (see Speci?cations). Positive-polarity devices are disabled when the
On/Off is grounded or brought to within a low voltage (see Speci?cations) with
respect to –Vin.
+ Vcc
time will vary slightly with output load type and current and input conditions.
There are two CAUTIONs for the On/Off Control:
CAUTION: While it is possible to control the On/Off with external logic if you
carefully observe the voltage levels, the preferred circuit is either an open
drain/open collector transistor or a relay (which can thereupon be controlled by
logic).
CAUTION: Do not apply voltages to the On/Off pin when there is no input power
voltage. Otherwise the converter may be permanently damaged.
NOTICE—Please use only this customer data sheet as product documentation
when laying out your printed circuit boards and applying this product into your
application. Do NOT use other materials as of?cial documentation such as
advertisements, product announcements, or website graphics.
We strive to have all technical data in this customer data sheet highly accurate
and complete. This customer data sheet is revision-controlled and dated. The
latest customer data sheet revision is normally on our website (www.murata-
ps.com) for products which are fully released to Manufacturing. Please be
especially careful using any data sheets labeled “Preliminary” since data may
change without notice.
ON/OFF CONTROL
– VIN
CONTROL
The pinout (Pxx) and case (Cxx) designations refer to a generic family of closely
related information. It may not be a single pinout or unique case outline.
Please be aware of small details (such as Sense pins, Power Good pins, etc.)
or slightly different dimensions (baseplates, heat sinks, etc.) which may affect
your application and PC board layouts. Study the Mechanical Outline drawings,
Input/Output Connection table and all footnotes very carefully. Please contact
Murata Power Solutions if you have any questions.
Figure 8. Driving the Positive Polarity On/Off Control Pin
www.murata-ps.com/support
MDC_HPH_B01 Page 12 of 13
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