BEL VRAF

NON-ISOLATED DC/DC CONVERTERS
12 Vdc Input
Vddq/2 / 8 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Nov. 10, 2010
VRAF-08AT5E
RoHS Compliant
Rev.A
Features
•
Non-Isolated
•
Under-Voltage Lockout
•
High Efficiency
•
Output Enable
•
Fixed Frequency
•
OCP/SCP
•
Current Source/Sink Capability
•
Low Cost
•
Tracking a Reference for Output Voltage
•
High Power Density
•
Over Voltage Protection (Hiccup Mode)
•
Class 1, Category 2, Non-Isolated DC/DC Converter (refer to IPC-9592)
Applications
•
Networking
•
Computers and peripherals
•
Telecommunications
Description
The Bel VRAF-08AT5E module is a non-isolated, step down dc/dc power converter that operates from a nominal
12 Vdc or wide range 5 Vdc to 13.8 Vdc source. This converter is designed specifically to provide bus termination
voltages in applications such as DDR (double data rate) memory where the bus termination voltage must closely
track the I/O bus voltage. The converter accepts a reference input and uses this to program its output voltage to
50% of the reference. The unit is packaged in compact single-in-line footprint and provides a maximum 8 A
output. Standard features include remote on/off, input under-voltage lockout, output over voltage protection.
Part Selection
Output Voltage
Input Voltage
0.9 Vdc
5.0 Vdc - 13.8 Vdc
Max. Output
Current
8A
Max. Output
Power
7.2 W
Typical
Efficiency
69%
Model Number
VRAF-08AT5E
Notes: Add “G” suffix at the end of the model number to indicate Tray Packaging.
Part Number Explanation
V R AF – 08 A T5 E
1 2
3
4
5
6
7
1---Vertical mount
2---RoHS 6, change “R” to “7” means RoHS 5
3---Series name (SIP)
4---Series code (output current 8A)
5---Input range (5.0-13.8V)
6---Output voltage (Vddq/2)
7---Suffix
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com
1
NON-ISOLATED DC/DC CONVERTERS
12 Vdc Input
Vddq/2 / 8 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Nov. 10, 2010
Absolute Maximum Ratings
Min
Typ
Max
Unit
Input Supply Voltage
-0.5
-
15
V
Input Signal Voltage
-0.3
-
5.25
V
0
-
70
°C
-40
-
85
°C
Parameter
Operating Temperature
Storage Temperature
Notes
Note: All specifications are typical at 25 °C unless otherwise stated.
Input Specifications
Parameter
Operating Input Voltage
Min
5.0
Typ
12
Max
13.8
Unit
V
Input Current (full load)
-
-
2.2
A
Input Current (no load)
-
25
35
mA
1.2
1.8
2.0
V
Remote Off Input Current
-
7
10
mA
Input Reflected Ripple Current
(pk-pk)
-
110
180
mA
Input Reflected Ripple Current
(rms)
-
25
60
mA
I t Inrush Current Transient
-
0.006
0.012
As
Turn-on Voltage Threshold
2.6
-
3.9
V
Turn-off Voltage Threshold
2.4
-
3.7
V
Reference Voltage Range (Vddq)
2
Notes
With simulated source impedance of
1000 nH, 5 Hz to 20 MHz. Use a 100
uF/25 V Tan cap with ESR=0.025 ohm
max, at 100 [email protected]°C.
2
Notes: 1. All specifications are typical at 25 °C unless otherwise stated.
2. This power module is not internally fused. An input line fuse must always be used.
Output Specifications
Parameter
Min
Typ
Max
Unit
-
Vddq/2
-
V
-1.5
-
1.5
%
Load Regulation
-
3
6
mV
Line Regulation
-
3
6
mV
Output Current
0
-
8
A
9.2
-
14
A
Output Ripple and Noise (pk-pk)
-
25
50
mV
Output Ripple and Noise (rms)
-
8
15
mV
Short Circuit Surge Transient
-
1.1
2.2
As
Turn on Time
-
2.5
5
mS
Output Voltage Set Point
Tracking Tolerance
(Vddq/2-Vout)/Vout
Output DC Current Limit
Notes
Vin=12 V, lout=full load
Test conditions:
0-20 MHz BW, with a 22 uF / 6.3 V
ceramic capacitor at the output.
2
Start up from ENABLE.
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com
2
NON-ISOLATED DC/DC CONVERTERS
12 Vdc Input
Vddq/2 / 8 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Nov. 10, 2010
Output Specifications (continued)
Parameter
Min
Typ
Max
Unit
Overshoot at Turn on
-
0
3
%
Output Capacitance
0
-
2200
uF
Notes
Transient Response
△V50%~100%
Overshoot
-
100
200
mV
of Max Load
Settling Time
-
20
50
uS
△V100%~50%
Overshoot
-
100
200
mV
of Max Load
Settling Time
-
20
50
uS
di/dt=0.3 A/uS; VO =0.9 V; Vin12 V;
and with a 22 uF / 6.3 V ceramic
capacitor at the output.
Note: All specifications are typical at Vin =12 V, Vddq=1.8 V, Io=8 A, Ta= 25°C unless otherwise stated.
General Specifications
Min
Typ
Max
Unit
Efficiency
Parameter
68
69
-
%
Switching Frequency
260
300
340
kHz
-
2.5
-
g
Weight
MTBF
6,416,286
hours
0.65 x 0.41 x 0.40
16.51 x 10.41 x 10.16
-
Notes
Vin=12 V, Vddq=1.8 V, Io=8 A
Calculated Per Bell Core SR-332 (IO =
80% load; Vin=12 V; Ta = 25 °C)
Dimensions
Inches (L × W × H)
Millimeters (L × W × H)
Note: All specifications are typical at 25 °C unless otherwise stated.
Control Specifications
Parameter
Output Enable
Min
Typ
Max
Unit
ENABLE High
2
-
5.5
V
ENABLE Low
0
-
0.8
V
Notes
Enable Pin open, the module is off.
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com
3
NON-ISOLATED DC/DC CONVERTERS
12 Vdc Input
Vddq/2 / 8 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Nov. 10, 2010
Efficiency Data
Efficiency
Efficiency Curve
85.0%
80.0%
75.0%
70.0%
65.0%
60.0%
55.0%
50.0%
45.0%
10.8 V
12.0 V
13.2 V
0.8
2.0
4.0
6.0
8.0
Output Current (A)
Thermal Derating Curves
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com
4
NON-ISOLATED DC/DC CONVERTERS
12 Vdc Input
Vddq/2 / 8 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Nov. 10, 2010
Thermal Derating Curve (continued)
The thermal reference point Tref is shown above. For reliable operation this temperature should not exceed
115°C. The output power of the module should not exceed the rated power for the module.
Vin=12 V, Vddq=1.8 V
Ripple and Noise Waveform
Note: Ripple and noise at Vin=12 V, Vddq=1.8 V, Io=8 A, with a 22 uF/6.3 V X5R ceramic capacitor at the output,
Ta=25 °C.
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com
5
NON-ISOLATED DC/DC CONVERTERS
12 Vdc Input
Vddq/2 / 8 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Nov. 10, 2010
Transient Response Waveforms
50% to 100% load step at Vin=12 V, Vddq=1.8 V
100% to 50% load step at Vin=12 V, Vddq=1.8 V
Note: Transient response at di/dt=0.3 A/uS, with 22 uF/6.3 V X5R ceramic capacitor at the output, Ta=25 °C.
Output Tracking
Test condition: Vin=12 V, Vddq=1.8 V, Io=8 A.
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com
6
NON-ISOLATED DC/DC CONVERTERS
12 Vdc Input
Vddq/2 / 8 A Output
Nov. 10, 2010
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Mechanical Outline
Pin Connections
Pin
Function
1
Vin
2
Vddq
3
Vout (Vtt)
4
GND
5
Enable
Note: This module is recommended and compatible with Pb-Free Wave Soldering and must be soldered
using a peak solder temperature of no more than 260 ºC for less than 5 seconds.
Note:
1) All Pins: Material - Copper Alloy;
Finish – 3 micro inches minimum Gold over 50 micro inches minimum Nickel plate.
2) Undimensioned components are shown for visual reference only.
3) All dimensions in inches (mm); Tolerances: x.xx +/-0.02 in. (x.x +/-0.5mm) x.xxx +/-0.010 in. (x.xx +/-0.25mm).
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com
7
NON-ISOLATED DC/DC CONVERTERS
12 Vdc Input
Vddq/2 / 8 A Output
Bel Power Inc., a subsidiary of Bel Fuse Inc.
Nov. 10, 2010
Revision History
Date
Revision
2010-11-10
A
Changes Detail
Approval
First release
HL Lu
RoHS Compliance
Complies with the European Directive 2002/95/EC, calling for the elimination of lead and
other hazardous substances from electronic products.
©2010 Bel Fuse Inc. Specifications subject to change without notice. 111010
8
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