DFA20E24S12 POWER ONE, DFA20E24S12 Datasheet - Page 3

• Manufacturer Part Number: DFA20E24S12
• Description: CONVERTER DC-DC 20W 24V/12V SGL
• Manufacturer: POWER ONE
• Series: DFA20r
• Type: Isolatedr

Specifications of DFA20E24S12

• Output: 12V
• Number Of Outputs: 1
• Power (watts): 20W
• Mounting Type: Through Hole
• Voltage - Input: 18 ~ 36V
• Package / Case: 7-DIP Module
• 1st Output: 12 VDC @ 1.7A
• Size / Dimension: 2.02" L x 2.02" W x 0.45" H (51.3mm x 51.3mm x 11.4mm)
• Power (watts) - Rated: 20W
• Operating Temperature: -50°C ~ 100°C
• Efficiency: 85%
• Approvals: CE, cUL, EN, TUV, UL
• Output Power: 20W
• Output Current: 1.7A
• Input Voltage: 24V
• Output Voltage: 12V
• Screening Level: Industrial
• Product Length (mm): 51.31mm
• Product Height (mm): 11.43mm
• Product Depth (mm): 51.31mm
• Mounting Style: Through Hole
• Pin Count: 7
• Product: Isolated
• Input Voltage Range: 18 V to 36 V
• Output Voltage (channel 1): 12 V
• Output Current (channel 1): 1700 mA
• Isolation Voltage: 700 V
• Package / Case Size: DIP
• Output Type: Isolated
• Brand/series: DFA20 Series
• Configuration: Encapsulated
• Current, Output: 1700 mA
• Dimensions: 2.02 in. W x 2.02 in. H
• Operation: Switching
• Power, Output: 20 W
• Primary Type: DC-DC Converter
• Special Features: Remote On/Off, Trim
• Temperature, Operating, Maximum: +85 °C
• Temperature, Operating, Minimum: -40 °C
• Voltage, Input: 36 VDC
• Voltage, Output: 12 VDC
• Voltage, Output, Accuracy: 12 VDC (Typ.)
• Extended Range Input (2: 1)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• 3rd Output: -
• 2nd Output: -
• 4th Output: -
• Lead Free Status / Rohs Status: Not Compliant
• Other names: 179-1038

MCD10079 Rev. 1.3, 15-Jun-10
DFA20 SERIES APPLICATION NOTES:
External Capacitance Requirements
No external capacitance is required for operation of the
DFA20 Series. The use of input capacitors with less than
0.5 Ohms ESR may cause peaking in the input filter and
degrade filter performance. External output capacitance
is
recommended that 1
0.1
system noise. Additional output capacitance may be
added for increased filtering, but should not exceed
400
Negative Outputs
A negative output voltage may be obtained by connecting
the +OUT to circuit ground and connecting -OUT as the
negative output.
Remote ON/OFF Operation
The remote ON/OFF pin may be left floating if this
function is not used. It is recommended to drive this pin
with an open collector arrangement or a relay contact.
+ INPUT
Ð INPUT
ON/OFF
μ
μ
F ceramic capacitance be selected for reduced
not
F.
1
2
3
required
FILTER
INPUT
LC
THERMAL SHUTDOWN
for
μ
CURRENT
F to 10
MODE
PWM
DFA20 SERIES BLOCK DIAGRAM
FIVE SIDED SHIELDED COPPER CASE
ISOLATION TRANSFORMER
operation.
μ
F of tantalum and 0.001 to
FEEDBACK
ISOLATED
However,
REFERENCE
BANDGAP
+
Ð
LOW TC
DFA20 Single-Output DC-DC Series Data Sheet
+
it
Page 3 of 4
is
5
6
7
+OUT
When the ON/OFF pin is pulled low with respect to the
-INPUT, the converter is placed in a low power drain
state.
Output Trim
The TRIM pin may be used to adjust the output ±5% from
the nominal setting. This function allows adjustment for
voltage drops in the system wiring, as well as the 5.2 volt
outputs for ECL applications. Figure 1 shows the proper
connections to use this function. A trimpot value of 10
kOhms should be used for 3.3 and 5 volt outputs. A
trimpot value of 20 kOhms should be used for 12 and 15
volt outputs. If the TRIM function is not required, the pin
may be left floating.
TRIM
-OUT
+ OUTPUT
- OUT
TRIM
USING TRIMPOT
5
7
6
10K
Figure 1
LOAD
20
15
10
5
0
50
OUTPUT POWER DERATING
AMBIENT TEMPERATURE
60
+OUT
-OUT
TRIM
USING FIXED RESISTORS
.
70
5
7
6
80
www.power-one.com
90
TRIM
DOWN
TRIM
UP
100
LOAD