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D12F200B Datasheet(PDF) 9 Page - Delta Electronics, Inc.

Part # D12F200B
Description  4.5V~13.8Vin, 0.6V~5.0Vout, 40A
Download  13 Pages
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Manufacturer  DELTA [Delta Electronics, Inc.]
Direct Link  http://www.deltaww.com
Logo DELTA - Delta Electronics, Inc.

D12F200B Datasheet(HTML) 9 Page - Delta Electronics, Inc.

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DS_D12F200_11042008
9
FEATURES DESCRIPTIONS (CON.)
Over-Current and Short-Circuit Protection
The D12F200 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 D12F200 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 34.
Figure 34: Circuit configuration for remote sense
Output Capacitance
There are internal output capacitors on the D12F200 modules.
Hence, no external output capacitor is required for stable
operation.
Output Voltage Programming
The output voltage of the D12F200 is trimmable by connecting
an external resistor between the trim pin and output ground as
shown Figure 35 and the typical trim resistor values are shown
in Table 1.
Unit
Vin
Vout
Enable
Trim(+)
GND
GND
Rtrim
Figure 35: Trimming Output Voltage
The D12F200 module has a trim range of 0.6V to 5.0V. The
trim resistor equation for the D12F200 is:
6
.
0
1200
)
(
=
Ω
Vout
Rtrim
Vout is the output voltage setpoint
Rtrim is the resistance between Trim and Ground
Rtrim values should not be less than 270Ω
Output
Rtrim (Ω)
0.6V
open
+0.9 V
4K
+1.2V
2K
+1.5 V
1.33K
+1.8V
1K
+2.5 V
631.6
+3.3 V
444.4
+5.0V
272.7
Table 1: Typical trim resistor values
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
D12F200 converters do not have built-in current sharing
(paralleling) ability. Hence, paralleling of multiple D12F200
converters is not recommended
.


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