SRAH-03C120 [BEL]
NON-ISOLATED DC/DC CONVERTERS; 非隔离式DC / DC转换器
| 型号： | SRAH-03C120 |
| 厂家： | 
BEL FUSE INC. |
| 描述： | NON-ISOLATED DC/DC CONVERTERS |
| 文件： | 总9页 (文件大小：192K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
NON-ISOLATED DC/DC CONVERTERS
3.3 Vdc Input
0.9 Vdc - 2.5 Vdc/3 A Output
xRAH-03C Series RoHS Compliant
Rev.A
•
•
•
•
•
Non-Isolated
•
•
•
•
•
OCP/SCP
High Efficiency
Wide Range Trim
Low Cost
Remote On/Off
Excellent Thermal Performance
Input Under Voltage Lockout
Industrial Temperature Range
UL60950-1 Recognized (UL/cUL)
Description
The Bel xRAH-03C1A0 modules are a series of non-isolated, step down dc/dc converters that operate from a
nominal 3.3 Vdc source. These converters are available in a range of output voltages from 0.9 Vdc to 2.5 Vdc. It
is packaged in a compact, overmolded package rated at 3 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 2.5 Vdc output is typically 93% at full load. Typical features include remote on/off, input under
voltage lockout, over current protection and short circuit protection.
Part Selection
Output Voltage
Input
Voltage
Max. Output
Current
Max. Output
Power
Typical
Efficiency
Part Number
Surface Mount
Part Number
Vertical Mount
0.9 Vdc - 2.5 Vdc
2.5 Vdc
3.3 Vdc
3.3 Vdc
3.3 Vdc
3.3 Vdc
3.3 Vdc
3.3 Vdc
3 A
3 A
3 A
3 A
3 A
3 A
7.5 W
7.5 W
5.4 W
4.5 W
3.6 W
2.7 W
93%
93%
89%
87%
84%
81%
SRAH-03C1A0
SRAH-03C250
SRAH-03C180
SRAH-03C150
SRAH-03C120
SRAH-03C090
VRAH-03C1A0
VRAH-03C250
VRAH-03C180
VRAH-03C150
VRAH-03C120
VRAH-03C090
1.8 Vdc
1.5 Vdc
1.2 Vdc
0.9 Vdc
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
Min
Typ
Max
Notes
Input Voltage (continuous)
-0.3 V
-
6 V
Output Enable Terminal Voltage
Ambient Temperature
-0.3 V
-40 °C
-55 °C
-
-
-
6 V
85 °C
125 °C
Storage Temperature
Input Specifications
Parameter
Min
Typ
Max
Notes
Input Voltage
3 V
-
-
3.6 V
Input Current (no load)
Input Current (full load)
-
110mA
VO=2.5 V
-
-
-
-
-
-
-
-
-
-
3.1 A
2.3 A
1.9 A
1.6 A
1.2 A
VO=1.8 V
VO=1.5 V
VO=1.2 V
VO=0.9 V
Remote Off Input Current
-
7 mA
14 mA
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
3.3 Vdc Input
0.9 Vdc - 2.5 Vdc/3 A Output
Input Specifications (continued)
Parameter
Min
Typ
Max
Notes
With simulated source impedance
of 500 nH, 5 Hz to 20 MHz; use a
270 uF/6.3 V capacitor with
Input Reflected Ripple Current (pk-pk)
-
50 mA
100 mA
ESR=0.03 ohm max, at 100 kHz.
Input Reflected Ripple Current (rms)
-
15 mA
25 mA
I2t Inrush Current Transient
Turn on Voltage Threshold
Turn off Voltage Threshold
-
-
-
0.01 A2s
2.7 V
0.02 A2s
-
-
2.4 V
Note: All specifications are typical at 25 °C unless otherwise stated.
Output Specifications
Parameter
Min
Typ
Max
Notes
Output Voltage Set Point
VO=2.5 V
VO=1.8 V
VO=1.5 V
VO=1.2 V
VO=0.9 V
2.450 V
1.764 V
1.470 V
1.176 V
0.882 V
2.5 V
1.8 V
1.5 V
1.2 V
0.9 V
2.550 V
1.836 V
1.530 V
1.224 V
0.918 V
Test conditions:
Vin=3.3 V, Io= full load
Line Regulation
Load Regulation
VO=2.5 V
VO=1.8 V
VO=1.5 V
VO=1.2 V
VO=0.9 V
-
-
-
-
-
1 mV
1 mV
1 mV
1 mV
1 mV
5 mV
5 mV
5 mV
5 mV
5 mV
VO=2.5 V
VO=1.8 V
VO=1.5 V
VO=1.2 V
VO=0.9 V
-
-
-
-
-
1 mV
1 mV
1 mV
1 mV
1 mV
5 mV
5 mV
5 mV
5 mV
5 mV
Regulation Over Temperature
(-40 °C to +85 °C)
-
-
-
-
-
10 mV
10 mV
10 mV
10 mV
10 mV
20 mV
20 mV
20 mV
20 mV
20 mV
VO=2.5 V
VO=1.8 V
VO=1.5 V
VO=1.2 V
VO=0.9 V
Output Current
0 A
5 A
-
-
3 A
9 A
Current Limit Threshold
Short Circuit Surge Transient
VO=2.5 V
VO=1.8 V
VO=1.5 V
VO=1.2 V
VO=0.9 V
-
-
-
-
-
0.04 A2s
0.04 A2s
0.04 A2s
0.04 A2s
0.04 A2s
0.08 A2s
0.08 A2s
0.08 A2s
0.08 A2s
0.08 A2s
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
3.3 Vdc Input
0.9 Vdc - 2.5 Vdc/3 A Output
Output Specifications (continued)
Parameter
Min
Typ
Max
Notes
Ripple and Noise (rms)
VO=2.5 V
-
-
-
-
-
10 mV
10 mV
10 mV
10 mV
10 mV
20 mV
20 mV
20 mV
20 mV
20 mV
VO=1.8 V
VO=1.5 V
VO=1.2 V
VO=0.9 V
Test conditions:
0-20 MHz BW; 0.1 uF ceramic
capacitor and
10 uF tantalum capacitor at the
output.
Ripple and Noise (pk-pk)
VO=2.5 V
-
-
-
-
-
45 mV
45 mV
45 mV
45 mV
45 mV
70 mV
70 mV
70 mV
70 mV
70 mV
VO=1.8 V
VO=1.5 V
VO=1.2 V
VO=0.9 V
Turn on Time
-
-
7 mS
0%
-
15 mS
1%
Overshoot at Turn on
Output Capacitance
Transient Response
0 uF
1200 uF
-
-
-
-
Overshoot
100 mV
130 mV
50% ~ 100%
Max Load
Settling Time
30 uS
100 mV
30 uS
100 mV
30 uS
100 mV
30 uS
90 mV
30 uS
90 mV
30 uS
90 mV
30 uS
90 mV
30 uS
90 mV
30 uS
90 mV
30 uS
60 uS
130 mV
60 uS
VO=2.5 V
Overshoot
100% ~ 50%
Max Load
Settling Time
Overshoot
-
-
-
130 mV
60 uS
50% ~ 100%
Max Load
Settling Time
VO=1.8 V
Overshoot
130 mV
60 uS
100% ~ 50%
Max Load
Settling Time
-
-
Overshoot
120 mV
60 uS
50% ~ 100%
Max Load
Test conditions:
-
-
-
-
-
-
-
-
-
-
-
Settling Time
di/dt=0.5 A/us, Vin=3.3 V,
without any external
capacitor at the output.
VO=1.5 V
Overshoot
120 mV
60 uS
100% ~ 50%
Max Load
Settling Time
Overshoot
120 mV
60 uS
50% ~ 100%
Max Load
Settling Time
VO=1.2 V
Overshoot
120 mV
60 uS
100% ~ 50%
Max Load
Settling Time
Overshoot
120 mV
60 uS
50% ~ 100%
Max Load
Settling Time
VO=0.9 V
Overshoot
120 mV
60 uS
100% ~ 50%
Max Load
Settling Time
Note: All specifications are typical at nominal input, full load at 25 °C unless otherwise stated.
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
3.3 Vdc Input
0.9 Vdc - 2.5 Vdc/3 A Output
General Specifications
Parameter
Min
Typ
Max
Notes
Efficiency
VO=2.5 V
90%
86%
84%
81%
78%
93%
89%
87%
84%
81%
-
-
-
-
-
Measured at Vin=3.3 V, full load and
Ta=25 °C
VO=1.8 V
VO=1.5 V
VO=1.2 V
VO=0.9 V
Switching Frequency
250 kHz
0
300 kHz
-
340 kHz
292%VO
Output Trim Range (wide trim)
Vo=0.9 V
Output Trim Range (narrow trim)
Vo=1.2 V - 2.5 V
90%Vo
-
-
-
110%Vo
110%Vo
Vo=0.9 V
Calculated Per Bell Core SR-332 (IO =
Nominal; Ta = 25 °C)
MTBF
3,131,719 hours
Dimensions (surface mount)
Inches (L × W × H)
0.78 x 0.70 x 0.32
Millimeters (L × W × H)
Dimensions (vertical)
Inches (L × W × H)
19.81 x 17.78 x 8.13
0.70 x 0.308 x 0.65
17.78 x 7.82 x 16.51
Millimeters (L × W × H)
Weight
-
5 g
-
Note: All specifications are typical at 25 °C unless otherwise stated.
Control Specifications
Parameter
Min
Typ
Max
Notes
Remote On/Off
Signal Low (Unit Off)
Signal High (Unit On)
-0.3 V
1.8 V
-
-
0.3 V
3.6 V
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
3.3 Vdc Input
0.9 Vdc - 2.5 Vdc/3 A Output
Output Trim Equations
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
Rtrimdown
A
Module
Trim
R
=
− B
− D
trimdown
V −V
GND
nom
adj
Vout
Trim
C
Module
R =
trimup
Rtrimup
V −V
adj
nom
GND
Vnom
A
B
C
D
Notes
Vo=0.9 V when Rtrim is open
0.9 - 2.5
2.5
N/A
N/A
3.712
3.712
3.712
3.712
3.712
3.712
1.54
11.5
16.2
11.5
6.81
33.2
7.9117
4.6538
3.2633
1.8699
N/A
16.14
20.84
16.14
11.45
N/A
Vo=2.505 V when Rtrim is open
Vo=1.803 V when Rtrim is open
Vo=1.503 V when Rtrim is open
Vo=1.203 V when Rtrim is open
Vo=0.903 V when Rtrim is open
1.8
1.5
1.2
0.9
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
3.3 Vdc Input
0.9 Vdc - 2.5 Vdc/3 A Output
Efficiency Data
MODULE 1.8V
MODULE 2.5V
100%
90%
80%
70%
100%
90%
80%
70%
60%
3.0V
3.3V
3.6V
3.0V
3.3V
3.6V
60%
0.3
0.3
0.75
1.5
2.25
3
0.75
1.5
2.25
3
OUTPUT CURRENT
OUTPUT CURRENT
MODULE 1.5V
MODULE 1.2V
100%
90%
80%
70%
60%
50%
100%
90%
80%
70%
60%
50%
3.0V
3.0V
3.3V
3.6V
3.3V
3.6V
0.3
0.75
1.5
2.25
3
0.3
0.75
1.5
2.25
3
OUTPUT CURRENT
OUTPUT CURRETN
MODULE 0.9V
100%
80%
60%
40%
3.0V
3.3V
3.6V
0.3
0.75
1.5
2.25
3
OUTPUT CURRENT
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
3.3 Vdc Input
0.9 Vdc - 2.5 Vdc/3 A Output
Thermal Derating Curve
Ripple and Noise Waveform
Ripple and noise at full load, 3.3 V input, 2.5 V output
Note: Ripple and Noise with 0.1 uF/16 V X7R ceramic capacitor and 10 uF tantalum capacitor 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
3.3 Vdc Input
0.9 Vdc - 2.5 Vdc/3 A Output
Transient Response Waveforms
50% to 100% load Transient at 3.3 V input, 2.5 V output
100% to 50% load Transient at 3.3 V input, 2.5 V output
Note: Transient Response at di/dt=0.5A/uS, 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
3.3 Vdc Input
0.9 Vdc - 2.5 Vdc/3 A Output
Mechanical Outline
SRAH-03C1A0
Pin Connections
Pin
Function
1
Remote On/Off (option)
2
Vin
Ground
Vout
3
4
5
Trim (option)
N/A
6
7
N/A
Pin Connections
Pin
Function
Remote On/Off (option)
Vin
VRAH-03C1A0
1
2
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. 010807
CORPORATE
FAR EAST
EUROPE
Bel Fuse Inc.
Bel Fuse Ltd.
Bel Fuse Europe Ltd.
206 Van Vorst Street
Jersey City, NJ 07302
Tel 201-432-0463
Fax 201-432-9542
www.belfuse.com
8F/ 8 Luk Hop Street
San Po Kong
Kowloon, Hong Kong
Tel 852-2328-5515
Fax 852-2352-3706
www.belfuse.com
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
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