RFB300/350 series is a high efficiency, enclosed, isolated dc-dc
converter series in an industry standard half-brick package that
provides up to 350 W of output power. The series delivers very
high usable output power for today’s high performance RF power
amplifier and similar applications. The four models in the series
feature an input voltage range of 18 Vdc to 36 Vdc and 36 Vdc to
75 Vdc and an output voltage of 12 V and 28 V. The output voltage
is adjustable from 7.2 Vdc to 13.2 Vdc or 16.8 Vdc to 29.4 Vdc (not
to exceed 308 W for the RFB300 [300 W for the RFB300-24S12]
and 350 W for the RFB350). The series also has a remote ON/OFF
capability. Overcurrent, overvoltage and overtemperature
protection features are included as standard. Negative logic
remote ON/OFF and other options are also available. Full
international safety approval including EN/IEC60950 VDE and
UL/cUL60950 reduces compliance costs and time to market.
Embedded Power for
Business-Critical Continuity
RFB300/350
Series
Single Output
Special Features
• High efficiency topology
• Wide temperature range,
-40 °C to +100 °C @ full power
• High power density
(160 W/in3 in 0.4” tall version)
• Input voltage range:
18-36 Vdc or 36-75 Vdc
• Output voltage range:
7.2-13.2 Vdc or 16.8-29.4 Vdc
• Remote ON/OFF
• Operational insulation system
• Available RoHS compliant
• 2 Year Warranty
Total Power: 300 - 350W
Input Voltage: 18 - 36 Vdc
36 - 75 Vdc
# of Outputs: Single
Rev.11.26.07
rfb300/350
1 of 6
Safety
UL/cUL CAN/CSA 22.2
No. 60950
File No. E135734
VDE0805/EN60950/IEC950
File No. 10401-3336-0198
Licence No. 40005395
Rev.11.26.07
rfb300/350
2 of 6
Embedded Power for
Business-Critical Continuity
All specifications are typical at nominal input, full load at 25 °C unless otherwise stated.
External output capacitance required (See Note 4).
Specifications
ABSOLUTE MAXIMUM RATINGS
Input voltage - peak 24 Vin -0.5-50 Vdc
(100 ms max., 48 Vin -0.5-100 Vdc
1.0 % duty cycle max.)
Input voltage continuous 24 Vin -0.5-40 Vdc
48 Vin -0.5-80 Vdc
Adjust pin voltage (with -0.5-12 Vdc
respect to -sense pin)
OUTPUT SPECIFICATIONS
Voltage adjustability 12 Vout 7.2-13.2 Vdc
28 Vout 16.8-29.4 Vdc
Min./max. load 12 Vout 0/25 A, 0/29.2 A
28 Vout 0/11 A, 0/12.5 A
Output load capacitance 12 Vout 470 μF to 4,700 μF
(See Note 10) 28 Vout 330 μF to 3,300 μF
Rise time (See Note 12) 5 ms typ.
INPUT SPECIFICATIONS
Input current 24 Vin 23.8 A max. @ lo max.
(See Note 3) 48 Vin RFB300 11.2 A max. @ lo max.
48 Vin RFB350 13 A max. @ lo max.
Input reflected ripple 24 Vin 12 mA (pk-pk)
(See Note 4) 48 Vin 12 V model 42 mA (pk-pk)
48 Vin 28 V model 28 mA (pk-pk)
Input capacitance - 24 Vin 39 μF
Internal filter 48 Vin 13 μF
Inrush current (See Note 11) 2 A2s
EMC CHARACTERISTICS
Conducted emissions EN55022 See Application Note 167
Radiated emissions EN55022 See Application Note 167
GENERAL SPECIFICATIONS
Efficiency 24 Vin 12 V model 86%
24 Vin 28 V model 90%
Vin = Vin (nom), 48 Vin 12 V model 88%
Iout (max.) 48 Vin 28 V model 91%
Approvals and VDE IEC60950
standards IECEE CB, UL/cUL60950
Material Flammability UL94V-0
Weight 0.5 inch tall version 110 g (3.88 oz.)
MTBF @ 55 °C 12 V model
1,900,000 hours min.
Telcordia SR-332 Issue 1 28 V model
2,400,000 hours min.
ENVIRONMENTAL SPECIFICATIONS
Thermal performance Operating baseplate, -40 °C to +100 °C
temperature
Non-operating -40 °C to +100 °C
RC PIN ELECTRICAL INTERFACE
Open collector compatible (See AN 167 for remote ON/OFF)
RC:
ON voltage (See Note 13) 5 V min.
Open circuit voltage
5 V min, 11 V typ
13 V max.
High level leakage current (See Note 14) -25 μA max.
OFF voltage (See Note 15) 1.2 V max.
Low level input current (See Note 16) -250 μA max.
OUTPUT INPUT OUTPUT OUTPUT OUTPUT EFFICIENCY REGULATION MODEL
POWER VOLTAGE VOLTAGE CURRENT CURRENT (TYP.) LINE LOAD NUMBER (18,20)
(MAX.) (MIN.) (MAX.)
300 W 18-36 Vdc 7.2-13.2 Vdc 0 A 25 A 86% ±0.15% ±0.2% RFB300-24S12Y
308 W 18-36 Vdc 16.8-29.4 Vdc 0 A 11 A 90% ±0.15% ±0.2% RFB300-24S28Y
308 W 36-75 Vdc 16.8-29.4 Vdc 0 A 11 A 91% ±0.15% ±0.2% RFB300-48S28Y
350 W 36-75 Vdc 7.2-13.2 Vdc 0 A 29.2 A 88% ±0.15% ±0.2% RFB350-48S12Y(17)
350 W 36-75 Vdc 16.8-29.4 Vdc 0 A 12.5 A 91% ±0.15% ±0.2% RFB350-48S28Y
Ordering Information
Part Number System with Options
Output Voltage
12 = 7.2 Vdc to 13.2 Vdc
28 = 16.8 Vdc to 29.4 Vdc
Remote ON/OFF Polarity
R = Negative Logic Option
Blank = Positive Logic Option
Height Option (17)
5 = 0.50 in (12.70 mm)
4 = 0.40 in (10.16 mm)
Threaded Inserts
T = Threaded Inserts
Blank = Clearance Inserts
RoHS Compliance(18)
Y = Non Pb-free (RoHS 5/6 compliant)
J = PB-free (RoHS 6/6 compliant)19
Number of Outputs
S = Single
Input Voltage
24 = 18 Vdc to 36 Vdc
48 = 36 Vdc to 75 Vdc
Rated Output Current
300 = 300/308 W
350 = 350 W
Product Family
RFB = Half-Brick
Rev.11.26.07
rfb300/350
3 of 6
Embedded Power for
Business-Critical Continuity
RFB300-24S28-R5TY
Notes
1 Measurement Bandwidth: 20 MHz; Measured with 1 μF ceramic and a 330 μF
(470 μF for 12 V output model) aluminum or solid tantalum capacitor across
the output terminals.
2 Di/dt = 1 A/μs; ΔIout = ±25% Iout (max); Vin = Vnom; Iout = Inom. Tested
with a 1 μF ceramic and a 330 μF (470 μF for 12 V output model) aluminum
electrolytic capacitor across the output.
3 External input fusing required. Use a fast acting fuse: 40 A (24 V model), 15 A
(48 V, 350 W model).
4 Iout = Iout (max) Measured with the input capacitor, Cbypass = 330 μF, and 6
μH inductor in series with the power source. Frequencies >100 kHz.
5 Signal line assumed <3 m in length.
6 This product is only for inclusion by professional installers within other
equipment and must not be operated as a stand-alone product.
7 Negative remote ON/OFF option also available. Add suffix ‘-R’ to part
number, for example see part numbering system.
8 With the enable signal asserted, this is the time from when the input current
reaches 10 % of the final steady state value until the output voltage reaches
10 % of the nominal output value. Start-up into resistive load.
9 With Vin > Vin (min.) applied for a minimum of 1 second, this is the time
from when the primary ON/OFF signal is activated until the output voltage
reaches 10 % of the nominal output voltage.
10 Minimum effective ESR is 1 mΩ. Minimum phase margin is 35°.
11 Measured per ETSI 300 132-2 Section 4.7.2.
12 From 10% to 90% of Vout (nom). Full resistive load. 1 μF ceramic and 330 μF
(470 μF for 12 V model) electrolytic capacitors across the output.
10 Minimum effective ESR is 1 mΩ. Minimum phase margin is 35°.
11 Measured per ETSI 300 132-2 Section 4.7.2.
12 From 10% to 90% of Vout (nom). Full resistive load. 1 μF ceramic and 330 μF
(470 μF for 12 V model) electrolytic capacitors across the output.
13 Converter guaranteed ON for positive option.
14 Maximum driver leakage to insure converter is ON.
15 Converter guaranteed OFF for positive option.
16 Driver sink current @ Vrc ≤ 1.2 V.
17 0.40 in height option is not available on the 12 V output model.
18 The’Y’ suffix indicates that these parts are TSE ToHS 5/6 (non-Pb-free)
compliant
19 New RoHS 6/6 codes coming soon: RFB300-48S28-R5J; RFB350-48S12-R5J.
20 Notice: Some models do not support all options. Please contact your local
sales representative.
PROTECTION
Short-circuit 12 V model RFB300 29.4 A
(Brickwall current 12 V model RFB350 34.4 A
limiting) 28 V model RFB300 12.9 A
28 V model RFB350 14.7 A
Overvoltage protection 12 V model 15 V
(Output shutdown) 28 V model 33.2 V
Overtemperature (midpoint of baseplate) 110 °C
shutdown
Rev.11.26.07
rfb300/350
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Embedded Power for
Business-Critical Continuity
Specifications Contd.
-Out
-Sen
+Out
Vadj
+Sen
+IN
-IN
Case
RC 1 μF
50 V 330 μF
330 μF
Figure 1 - Standard Application - 28 V Models
-Out
-Sen
+Out
Vadj
+Sen
+IN
-IN
Case
RC 1 μF
50 V 470 μF
330 μF
Figure 2 - Standard Application - 12 V Models
OUTPUT CURRENT MAX. (%)
TEMPERATURE (ºC) BASEPLATE
0
20
40
60
80
100
-40 -20 0 20 40 60 80 100
Figure 3 - Derating Curve - All Models Figure 4 - Typical Turn-on Delay and
Risetime RFB350-48S28Y
Channel 1: Output Voltage, Channel 2: Input Voltage
0 3 6 9 12
84
86
88
90
92
EFFICIENCY (%)
OUTPUT CURRENT (A)
Vin = 48 V
Figure 6 - Typical Efficiency vs.
Output Current – RFB300-48S28Y
0 3 6 9 12
83
85
87
89
91
EFFICIENCY (%)
OUTPUT CURRENT (A)
Vin = 24 V
Figure 5 - Typical Efficiency vs.
Output Current – RFB300-24S28Y
Rev.11.26.07
rfb300/350
5 of 6
Embedded Power for
Business-Critical Continuity
Specifications Contd.
0 5 10 15 20 25 30
80
82
84
86
88
90
PERCENT EFFICIENCY (%)
OUTPUT CURRENT (A)
Vin = 24 V
Figure 9 - Typical Efficiency vs.
Output Current – RFB300-24S12Y
Figure 10 - RFB350-48S28Y Transient Response
Load 6.25-9.38 A
Figure 11 - RFB350-48S12Y Transient Response
Load 14.5-21.75 A
0 2 4 6 8 10 12 14
85
86
87
88
89
90
91
92
EFFICIENCY (%)
OUTPUT CURRENT (A)
Vin = 48 V
Figure 7 - Typical Efficiency vs.
Output Current – RFB350-48S28Y
0 6 12 18 24 30
84
86
88
90
92
EFFICIENCY (%)
OUTPUT CURRENT (A)
Vin = 48 V
Figure 8 - Typical Efficiency vs.
Output Current – RFB350-48S12Y
Embedded Power for
Business-Critical Continuity
Rev.11.26.07
rfb300/350
6 of 6
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Emerson Network Power.
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business-critical continuity.
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Figure 12 - Mechanical Drawing, Dimension Options and Pin-Out Table
Case
-Vin
+Vin
RC
-Sen
Vadj
2x ø0.081 (2.06)
7x ø0.040 (1.02)
-Vout
+Vout
+Sen
0.23 ±0.02 (5.84 ±0.51)
0.00 (0.00)
1.900 (48.26)
0 (0.00)
2.000 (50.80)
0
2.27 ±0.02 (57.66 ±0.51)
Case Footprint
2.39 ±0.02
(60.71 ±0.51)
Case Footprint
Height
(See Dimension Option Table Below)
4 x Thru Hole Insert 0.128 (3.25) Clearance
(M3 x 0.5 Threaded Inserts are Available)
0.300 (7.62)
0.700 (17.78)
1.000 (25.40)
1.300 (33.02)
1.700 (43.18)
PIN CONNECTIONS
PIN NUMBER FUNCTION
-Vin Negative Input Terminal
Case
RC ON/OFF Control Terminal
+Vin Positive Input Terminal
+Vout Positive Output Terminal
+Sen Positive Remote Sense
Vadj Output Adjustment Trim Pin
-Sen Negative Remote Sense
-Vout Negative Output Terminal
Dimension Options
Option Height
5 0.50 ±0.02 (12.70 0.51)
4 0.40 ±0.02 (10.16 ±0.51)
