HBR Series of Railway Half-Brick
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[Type text]
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Up to 150 Watts DC-DC Converter
Output Remote Sensing
The HBR SERIES converter has the capability to remotely sense both lines of its output. This feature moves the effective output voltage regulation
point from the output of the unit to the point of connection of the remote sense pins. This feature automatically adjusts the real output voltage of
the HBR series in order to compensate for voltage drops in distribution and maintain a regulated voltage at the point of load. The remote-sense
voltage range
is:
[(+Vout) - (-Vout)] – [(+Sense) – (-Sense)] ≦ 10% of Vo_nominal
If the remote sense feature is not to be used, the sense pins should be connected locally. The +Sense pin should be connected to the +Vout pin
at the module and the -Sense pin should be connected to
the -Vout pin at the module.
This is shown in the schematic below.
Note: Although the output voltage can be increased by both the remote sense and by the trim, the maximum increase for the output voltage is not
the sum of both. The maximum increase is the larger of either the remote sense or the trim. The amount of power delivered by the module is
defined as the voltage at the output terminals multiplied by the output current. When using remote sense and trim, the output voltage of the
module can be increased and consequently increase the power output of the module if output current remains unchanged. Care should be taken to
ensure that the maximum output power of the module remains at or below the maximum rated power (Maximum rated power = Vo,set x Io,max
)
Output Ripple and Noise
+Vo
+Sense
+Vin
Load
Resistor
+
Vin
Trim
10uF
1uF
-
BNC
To Scope
-Sense
-Vo
-Vin
Output ripple and noise is measured with 1.0uF ceramic and 10uF solid tantalum capacitors across the output.
Output Capacitance
For good transient response, low ESR output capacitors should be located close to the point of load. PCB design emphasizes low resistance and
inductance tracks in consideration of high current applications. Output capacitors with their associated ESR values have an impact on loop stability
and bandwidth. For absolute maximum value of HBR series’ output capacitance, please refer to page 3 Maximum Output Capacitance. For values
larger than this, please contact your local DATEL’s representative.
September 16 -2017 A.04
Page 12 of 15
DATEL [ DATEL, Inc. ]
