BEL XRAH-08E

NON-ISOLATED DC/DC CONVERTERS
4.5 Vdc - 14 Vdc Input
xRAH-08E Series
0.8 Vdc - 5.5 Vdc/8 A Output
RoHS Compliant
Rev.A
•
Non-Isolated
•
Remote On/Off
•
Fixed Frequency
•
Under-voltage Lockout (UVLO)
•
High Efficiency
•
OCP/SCP
•
High Power Density
•
Wide Trim Range
•
Low Cost
•
UL60950-1 Recognized (UL/cUL)
Description
The Bel xRAH-08Exxx modules are a series of non-isolated, step down dc/dc converters that operate from 4.5
Vdc to14 Vdc source. These converters are available in a range of output voltages from 0.8 Vdc to 5.5 Vdc. It is
packaged in a compact, overmolded package rated at 8 A. Optional lead forming provides a vertical mount
product for minimal footprint or a surface mount option for a very low profile. The output is closely regulated and
the efficiency for 5 Vdc output is typically 93% at full load.
Part Selection
Output
Voltage
0.8 V - 3.63 V
4.5 V - 5.5 V
Input
Voltage
4.5 V - 14 V
8 V - 14 V
Max. Output
Current
8A
8A
Max. Output
Power
26.4 W
44 W
Typical
Efficiency
91%
93%
Part Number
Surface Mount
SRAH-08E1A0
SRAH-08E500
Part Number
Vertical Mount
VRAH-08E1A0
VRAH-08E500
Notes: 1. Add “0” suffix at the end of the model number to indicate “Tube Packaging”, and “R” for “Reel
Packaging”, and “G” for “Tray Packaging”.
2. All part numbers above indicate RoHS 6. Change the second letter "R" to "7" for RoHS 5 part numbers.
Absolute Maximum Ratings
Parameter
Input Voltage (continuous)
Output Enable Terminal Voltage
Ambient Temperature
Storage Temperature
Min
-0.3 V
-0.3 V
-40 °C
-55 °C
Typ
-
Max
15 V
14 V
85 °C
125 °C
Notes
Input Specifications
Parameter
Min
Typ
Max
Vo=4.5 V-5.5 V
Vo=0.9 V-3.63 V
Input Current (full load)
Vo=5.0 V
VO=3.3 V
VO=2.5 V
VO=1.8 V
VO=1.5 V
VO=1.2 V
VO=0.9 V
Input Current (no load)
Remote Off Input Current
8.0 V
4.5 V
-
14 V
14 V
-
3 mA
5.4 A
6.7 A
5.3 A
3.2 A
3.0 A
2.8 A
2.0 A
100 mA
10 mA
Input Reflected Ripple Current (pk-pk)
-
250 mA
-
Input Reflected Ripple Current (rms)
-
70 mA
-
Notes
Input Voltage
With simulated source impedance of 500 nH,
5 Hz to 20 MHz; use two 47 uF/16 V low ESR
Tantalum capacitors.
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com
NON-ISOLATED DC/DC CONVERTERS
4.5 Vdc - 14 Vdc Input
0.8 Vdc - 5.5 Vdc/8 A Output
Input Specifications (continued)
Parameter
I t Inrush Current Transient
2
Turn-on Voltage Threshold
Turn-off Voltage Threshold
Min
-
Typ
2
0.006 A s
Max
2
0.02 A s
Notes
-
4.3 V
-
xRAH-08E1A0
-
7.6 V
-
xRAH-08E500
-
4.0 V
-
xRAH-08E1A0
-
6.2 V
-
xRAH-08E500
Output Specifications
Parameter
Output Voltage Set Point
Min
Typ
Max
Vo=5.0 V
VO=3.3 V
VO=2.5 V
VO=1.8 V
VO=1.5 V
VO=1.2 V
VO=0.9 V
4.900 V
3.234 V
2.450 V
1.764 V
1.470 V
1.176 V
0.882 V
5.0 V
3.3 V
2.5 V
1.8 V
1.5 V
1.2 V
0.9 V
5.100 V
3.366 V
2.550 V
1.836 V
1.530 V
1.224 V
0.918 V
Vo=5.0 V
VO=3.3 V
VO=2.5 V
VO=1.8 V
VO=1.5 V
VO=1.2 V
VO=0.9 V
-
±15 mV
±10 mV
±8 mV
±5 mV
±5 mV
±4 mV
±4 mV
±25 mV
±16.5 mV
±12.6 mV
±9 mV
±9 mV
±8 mV
±8 mV
Vo=5.0 V
VO=3.3 V
VO=2.5 V
VO=1.8 V
VO=1.5 V
VO=1.2 V
VO=0.9 V
-
±15 mV
±10 mV
±8 mV
±5 mV
±5 mV
±4 mV
±4 mV
±25 mV
±16.5 mV
±12.5 mV
±9 mV
±9 mV
±8 mV
±8 mV
-
30 mV
50 mV
Output Current
0A
-
8A
Current Limit Threshold
10 A
-
20 A
-
0.2 A s
-
Vo=5.0 V
Vo=3.3 V-0.9 V
-
30 mV
15 mV
50 mV
30 mV
Vo=5.0 V
Vo=3.3 V-0.9 V
-
100 mV
50 mV
150 mV
80 mV
-
8 mS
20 mS
-
0%
3%
0 uF
-
3200 uF
Line Regulation
Load Regulation
Regulation Over Temperature
(-40 °C to 85 °C)
Short Circuit Surge Transient
2
Notes
Test condition:
Vin=12 V, lout=50% full
load
Ripple and Noise (rms)
Ripple and Noise (pk-pk)
Turn on Time
Overshoot at Turn on
Output Capacitance
BW = 0-20 MHz; with a 1 uf
ceramic capacitor and a
10 uF/10 V Tantalum
capacitor at the output.
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com
NON-ISOLATED DC/DC CONVERTERS
4.5 Vdc - 14 Vdc Input
0.8 Vdc - 5.5 Vdc/8 A Output
Output Specifications (continued)
Parameter
Min
Typ
Max
Notes
-
200 mV
50 uS
200 mV
50 uS
120 mV
50 uS
120 mV
50 uS
300 mV
80 uS
300 mV
80 uS
180 mV
80 uS
180 mV
80 uS
di/dt = 0.5 A/uS; Vin =
12 V; with a 1 uF ceramic
capacitor and a 10 uF/10
V Tantalum capacitor at
the output.
Transient Response
50% ~ 100%
Max Load
100% ~ 50%
Max Load
50% ~ 100%
Max Load
100% ~ 50%
Max Load
Overshoot
Settling Time
Overshoot
Settling Time
Overshoot
Settling Time
Overshoot
Settling Time
Vo=5.0 V
Vo=3.3 V0.9 V
Note: All specifications are typical at 12 V input, full load at 25 °C unless otherwise stated.
General Specifications
Parameter
Min
Typ
Max
Notes
89%
87%
86%
84%
82%
81%
76%
93%
91%
90%
88%
86%
85%
80%
-
-
330 kHz
-
90%VO
-
403%VO
x7AH-08E1A0
90%VO
-
110%VO
x7AH-08E500
-
-
0.2V
Efficiency
Vo=5.0 V
VO=3.3 V
VO=2.5 V
VO=1.8 V
VO=1.5 V
VO=1.2 V
VO=0.9 V
Switching Frequency
Output Trim Range
Remote Sense Compensation
MTBF
Measured at Vin=12 V, full load
Weight
2
Calculated Per Bell Core SR-332 (IO =
Nominal; Ta = 25 °C)
7,801,334 hours
Dimensions (surface mount)
Inches (L × W × H)
Millimeters (L × W × H)
Dimensions (vertical)
Inches (L × W × H)
Millimeters (L × W × H)
1
0.78 x 0.7 x 0.32
19.81 x 17.78 x 8.13
0.7 x 0.308 x 0.65
17.78 x 7.82 x 16.51
-
6g
-
Notes: All specifications are typical at 25 °C unless otherwise stated.
1. The output voltage is 0.9 V at trim pin is open.
2. The output voltage is 5.0 V at trim pin is open.
Control Specifications
Parameter
Min
Typ
Max
Signal Low (Unit Off)
-0.3 V
-
0.8 V
Signal High (Unit On)
2.4 V
-
14 V
Notes
Remote On/Off
Remote on/off pin open, unit on.
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com
NON-ISOLATED DC/DC CONVERTERS
4.5 Vdc - 14 Vdc Input
0.8 Vdc - 5.5 Vdc/8 A Output
Output Trim Equations
1) xRAH-08E1A0
Equations for calculating the trim resistor (in kΩ) given the desired adjusted voltage (Vadj) and the nominal output
voltage of the converter (Vnom) are shown below. The Trim Down resistor should be connected between the
Trim pin and Vout. The Trim Up resistor should be connected between the Trim pin and Ground. Only one of the
resistors should be used for any given application.
Vout
Rtrim − down
1.076
=
− 5.631
Vo − Vadj
Rtrim-down
Module
Trim
GND
Rtrim−up
3.759
=
− 0.261
Vadj − Vo
Vout
Module
Trim
Rtrim-up
GND
Note: Output voltage Vo=0.9 V when Rtrim_up is not connected.
2) xRAH-08E500
Equations for calculating the trim resistor (in kΩ) given the desired adjusted voltage (Vadj) and the nominal output
voltage of the converter (Vnom) are shown below. The Trim Down resistor should be connected between the
Trim pin and Vout. The Trim Up resistor should be connected between the Trim pin and Ground. Only one of the
resistors should be used for any given application.
Vout
Rtrim − down
23.100
=
− 5.631
Vo − Vadj
Rtrim-down
Module
Trim
GND
Vout
Rtrim−up
3.759
=
− 0.261
Vadj − Vo
Module
Trim
Rtrim-up
GND
Note: Output voltage Vo=5 V when Rtrim_up is not connected.
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com
NON-ISOLATED DC/DC CONVERTERS
4.5 Vdc - 14 Vdc Input
0.8 Vdc - 5.5 Vdc/8 A Output
Efficiency Data
Efficiency Curve
Efficiency Curve
100.0%
95.0%
8.0 V
12.0 V
14.0 V
90.0%
85.0%
95.0%
Efficiency
Efficiency
100.0%
4.5 V
8.0 V
12.0 V
14.0 V
90.0%
85.0%
80.0%
80.0%
75.0%
75.0%
0.8
2
4
6
8
0.8
2
Output Current (A)
Vo=5.0 V
6
100.0%
95.0%
90.0%
85.0%
80.0%
75.0%
70.0%
65.0%
Efficiency
Efficiency
4.5 V
8.0 V
12.0 V
14.0 V
4
8
4.5 V
8.0 V
12.0 V
14.0 V
0.8
2
Output Current (A)
4
6
8
Output Current (A)
Vo=2.5 V
Vo=1.8 V
Efficiency Curve
Efficiency Curve
95.0%
95.0%
90.0%
90.0%
4.5 V
8.0 V
12.0 V
14.0 V
85.0%
80.0%
75.0%
4.5 V
8.0 V
12.0 V
14.0 V
85.0%
Efficiency
Efficiency
8
Efficiency Curve
100.0%
95.0%
90.0%
85.0%
80.0%
75.0%
70.0%
65.0%
2
6
Vo=3.3 V
Efficiency Curve
0.8
4
Output Current (A)
80.0%
75.0%
70.0%
70.0%
65.0%
65.0%
0.8
2
4
6
8
0.8
2
4
6
8
Output Current (A)
Output Current (A)
Vo=1.2 V
Vo=1.5 V
Efficiency
Efficiency Curve
95.0%
90.0%
85.0%
80.0%
75.0%
70.0%
65.0%
60.0%
4.5 V
8.0 V
12.0 V
14.0 V
0.8
2
4
6
8
Output Current (A)
Vo=0.9 V
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com
NON-ISOLATED DC/DC CONVERTERS
4.5 Vdc - 14 Vdc Input
0.8 Vdc - 5.5 Vdc/8 A Output
Thermal Derating Curves
VRAH-08E1A0
VRAH-08E500
SRAH-08E1A0
SRAH-08E500
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com
NON-ISOLATED DC/DC CONVERTERS
4.5 Vdc - 14 Vdc Input
0.8 Vdc - 5.5 Vdc/8 A Output
Ripple and Noise Waveforms
12 Vdc Input, 0.9 Vdc Output
12 Vdc Input 1.2 Vdc Output
12 Vdc Input, 1.5 Vdc Output
12 Vdc Input 1.8 Vdc Output
12 Vdc Input, 2.5 Vdc Output
12 Vdc Input 3.3 Vdc Output
12 Vdc Input, 5 Vdc Output
Note: Ripple and noise at full load, with a 1uF ceramic cap and a 10uF tan cap, Ta=25 deg C.
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com
NON-ISOLATED DC/DC CONVERTERS
4.5 Vdc - 14 Vdc Input
0.8 Vdc - 5.5 Vdc/8 A Output
Transient Response Waveforms
50% to 100% load 12 Vdc Input 0.9 Vdc Output
100% to 50% load 12 Vdc Input 0.9 Vdc Output
50% to 100% load 12 Vdc Input 1.2 Vdc Output
100% to 50% load 12 Vdc Input 1.2 Vdc Output
50% to 100% load 12 Vdc Input 1.5 Vdc Output
100% to 50% load 12 Vdc Input 1.5 Vdc Output
50% to 100% load 12 Vdc Input 1.8 Vdc Output
100% to 50% load 12 Vdc Input 1.8 Vdc Output
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com
NON-ISOLATED DC/DC CONVERTERS
4.5 Vdc - 14 Vdc Input
0.8 Vdc - 5.5 Vdc/8 A Output
Transient Response Waveforms (continued)
50% to 100% load 12 Vdc Input 2.5 Vdc Output
100% to 50% load 12 Vdc Input 2.5 Vdc Output
50% to 100% load 12 Vdc Input 3.3 Vdc Output
100% to 50% load 12 Vdc Input 3.3 Vdc Output
50% to 100% load 12 Vdc Input 5 Vdc Output
100% to 50% load 12 Vdc Input 5 Vdc Output
Note: Transient response at di/dt=0.5 A/uS, with a 1uF ceramic cap and a 10 uF/10 V tan cap at the output,
Ta=25 deg C.
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com
NON-ISOLATED DC/DC CONVERTERS
4.5 Vdc - 14 Vdc Input
0.8 Vdc - 5.5 Vdc/8 A Output
Mechanical Outline
SRAH-08Exxx
Pin Connections
bel
VRAH-08Exxx
Pin
1
2
3
4
5
6
7
Function
Remote On/Off (option)
Vin
Ground
Vout
Trim (option)
Sense (option)
N/A
Pin Connections
bel
bel
Pin
Function
1
Remote On/Off (option)
2
Vin
3
Ground
4
Vout
5
Trim (option)
RoHS Compliance
Complies with the European Directive 2002/95/EC, calling for the elimination of lead and
other hazardous substances from electronic products. These parts are not however
compatible with the higher temperatures associated with lead free solder processes and
must be soldered using a reflow profile with a peak temperature of no more than 240 ºC.
©2007 Bel Fuse Inc. Specifications subject to change without notice. 010507
CORPORATE
FAR EAST
EUROPE
Bel Fuse Inc.
206 Van Vorst Street
Jersey City, NJ 07302
Tel 201-432-0463
Fax 201-432-9542
www.belfuse.com
Bel Fuse Ltd.
8F/ 8 Luk Hop Street
San Po Kong
Kowloon, Hong Kong
Tel 852-2328-5515
Fax 852-2352-3706
www.belfuse.com
Bel Fuse Europe Ltd.
Preston Technology Management Centre
Marsh Lane, Suite G7, Preston
Lancashire, PR1 8UD, U.K.
Tel 44-1772-556601
Fax 44-1772-888366
www.belfuse.com