D12S2R550A Datasheet, PDF (8/11 Pages) Delta Electronics, Inc. – Non-Isolated Point of Load DC/DC Modules: 4.5V~13.8Vin, 0.6V~5.0Vout, 50A

FEATURES DESCRIPTIONS (CON.)
Over-Current and Short-Circuit Protection
The D12S2R550 modules have non-latching over-current and
short-circuit protection circuitry. When over current condition
occurs, the module goes into the non-latching hiccup mode.
When the over-current condition is removed, the module will
resume normal operation.
An over current condition is detected by measuring the voltage
drop across the inductor. The voltage drop across the inductor is
also a function of the inductor’s DCR.
Note that none of the module specifications are guaranteed
when the unit is operated in an over-current condition.
Output Over Voltage Protection (OVP)
The converter will shut down when an output over voltage
protection is detected. Once the OVP condition is detected,
controller will stop all PWM outputs and turn on low-side
MOSFET to prevent any damage to load.
Remote Sense
The D12S2R550 provide Vo remote sensing to achieve proper
regulation at the load points and reduce effects of distribution
losses on output line. In the event of an open remote sense line,
the module shall maintain local sense regulation through an
internal resistor. The module shall correct for a total of 0.5V of
loss. The remote sense connects as shown in Figure 32.
Output Voltage Programming
The output voltage of the D12S2R550 is trimmable by
connecting an external resistor between the trim pin and output
ground as shown Figure 33 and the typical trim resistor values
are shown in Table 1.
Unit
Vin
Enable
GND
Vout
Trim(+)
GND
Rtrim
Figure 29: Trimming Output Voltage
The D12S2R550 module has a trim range of 0.6V to 5.0V. The
trim resistor equation for the D12S2R550 is:
Rtrim()  ¹²⁰⁰
Vout  0.6
Vout is the output voltage setpoint
Rtrim is the resistance between Trim and Ground
Rtrim values should not be less than 270Ω
Output
Vo₀l_.t₆a_Vge
+1.1 V
+1.2V
+1.5 V
+1.8V
+2.5 V
+3.3 V
+5.0V
Rtrim (Ω)
open
2.4K
2K
1.33K
1K
631.6
444.4
272.7
Table 1: Typical trim resistor values
Figure 28: Circuit configuration for remote sense
Output Capacitance
There are internal output capacitors on the D12S2R550
modules. Hence, no external output capacitor is required for
stable operation.
Power Good
The converter provides an open collector signal called Power
Good. This output pin uses positive logic and is open collector.
This power good output is able to sink 4mA and set high when
the output is within ±10% of output set point. The power good
signal is pulled low when output is not within
±10% of Vout or Enable is OFF.
Paralleling
D12S2R550 converters do not have built-in current sharing
(paralleling) ability. Hence, paralleling of multiple D12S2R550
converters is not recommended.
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