D12S05020-1A Datasheet, PDF (8/12 Pages) Delta Electronics, Inc. – Non-Isolated Point of Load DC/DC Modules: 4.5V~13.2Vin, 0.59V~5.0Vout, 20A

FEATURES DESCRIPTIONS (CON.)
Over-Current and Short-Circuit Protection
The D12S05020-1 series 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 MOSFETs. The voltage drop
across the MOSFET is also a function of the MOSFET’s
Rds(on). Rds(on) is affected by temperature, therefore
ambient temperature will affect the current limit inception
point.
Output Over Voltage Protection (OVP)
Output Voltage Programming
The output voltage of the D12S05020-1 series is adjusted
by connecting an external resistor between the trim pin
and output ground as shown Figure 27and the typical trim
resistor values are shown in Table 1.
Unit
Vin
Enable
GND
Vout
Trim(+)
GND
Rtrim
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, turn on low-side MOSFET
and pull low the PGOOD signal to prevent any damage to
load.
Paralleling
D12S05020-1 series converters do not have built-in
current sharing (paralleling) ability. Hence, paralleling of
multiple D12S05020-1 series converters is not
recommended.
Figure 27: Trimming Output Voltage
The D12S05020 series module has a trim range of
0.59V to 5.0V. The trim resistor equation for the
D12S05020 series is:
Rtrim(Ω) = ^1.18
Vout − 0.59
Vout is the output voltage set point
Rtrim is the resistance between Trim and Ground
Rtrim values should not be less than 240Ω and shall be
with 0.1% or better tolerance.
Output Voltage
0.59V
0.9 V
1.1 V
1.2 V
1.5 V
2.5V
3.3V
5.0V
Rtrim (Ω)
open
3.83k
2.32K
1.94K
1.30K
618
435
267
Table 1: Typical trim resistor values
DS_D12S05020_10282008
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