XRPF-20A1A0_07 Datasheet, PDF (3/9 Pages) Bel Fuse Inc. – NON-ISOLATED DC/DC CONVERTERS

NON-ISOLATED DC/DC CONVERTERS
12 Vdc Input
0.9 Vdc - 5.0 Vdc/20 A Output
General Specifications
Parameter
Efficiency (Current Source)
Vo=5.0 V
Vo=3.3 V
Vo=2.5 V
Vo=0.9 V
Efficiency (Current Sink)
Vo=2.5 V
Vo=0.9 V
Switching Frequency
Output Voltage Trim Range
Min
89%
86%
83%
65%
79%
60%
240 kHz
0.9 V
Typ
92%
89%
86%
69%
82%
63%
275 kHz
-
Max
-
-
-
-
-
-
310 kHz
5.0 V
MTBF
5,570,000 hours
Dimensions
Inches (L × W × H)
Millimeters (L × W × H)
Dimensions
Inches (L × W × H)
Millimeters (L × W × H)
Weight
1.2 x 1.1 x 0.457
30.48 x 27.94 x 11.6
1.2 x 1.1 x 0.508
30.48 x 27.94 x 12.91
-
15 g
-
Note: All specifications are typical at 25 °C unless otherwise stated.
Notes
Measured at Vin=12 V, full load.
Vo=0.9 V when the Trim pin is open.
Calculated Per Bell Core SR-332 (IO =
Nominal; Ta = 25 °C)
VRPF-20A1A0
0RPF-20A1A0
Control Specifications
Parameter
Min
Typ
Max
Remote On/Off
Notes
Signal Low (Unit Off)
Signal High (Unit On)
-0.3 V
-
2.4 V
-
0.8 V
13.8 V
Remote On/Off pin open, unit on.
Power Good
Power Good Delay ¹
-
-
8 mS
Note: All specifications are typical at 25 °C unless otherwise stated.
1. The power good signal is an open collector output. When the output of the module reaches 90% of the
nominal set point, the power good pin is set high.
Output Trim Equations
Equation for calculating the trim resistor (in kΩ) given the desired adjusted voltage (Vadj) is shown below. The
Trim Up resistor should be connected between the Trim pin and Ground. Trim values should not be less than
280Ω.
R_trim
=
1.17
V_adj − 0.9
Vout
Module ^Trim
Rtrim
GND
Equation for calculating the trim voltage (in V) given the desired adjusted voltage (Vadj) is shown below. The
Trim Up voltage should be connected between the Trim pin and Ground.
Vout
Rt = ^{Rs × (1.3Vt − 1.17)}
1.17 − Rs × (V_adj − 0.9)
Module _Trim
GND
Rt
Rs
Vt
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel [phone] • Fax [phone] • www.belfuse.com