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NON-ISOLATED DC/DC CONVERTERS
10.8 Vdc - 13.2 Vdc Input, 1.23, 2.5, 3.3, -12 Vdc/6, 1.5, 1.5, 2 A Sep. 22, 2009
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
RoHS Compliant
* * * * * Low Cost Under Voltage Lockout OCP/SCP Remote On/Off Wide Operating Temperature Range
SRXA-40AQ1L Features
* * * * * * Non-Isolated High Efficiency Fixed Frequency High Power Density Wide Input
Rev.C
Class 1, Category 2, Non-Isolated DC/DC Converter (refer to IPC-9592)
Applications
* * * Networking Computers and peripherals Telecommunications
Description
The Bel SRXA-40AQ1L is part of the non-isolated dc/dc converter Power Module series. The modules use a SMT package. These converters provide 4 outputs: 1.23 Vdc/6 A, 2.5 Vdc/1.5 A, 3.3 Vdc/1.5 A and -12 Vdc/2 A over a wide range of input voltage (Vin = 10.8 - 13.2 Vdc).The efficiency is typically 91% @ 12Vin at full load.
Part Selection
Output Voltage 1.23/ 2.5/ 3.3/ -12 Vdc Input Voltage 10.8 Vdc - 13.2 Vdc Max. Output Current 6/ 1.5/ 1.5/ 2 A Max. Output Power 40 W Typical Efficiency 91% Model Number Active Low SRXA-40AQ1L
Notes: Add "G" suffix at the end of the model number to indicate Tray Packaging.
Part Number Explanation S R XA - 40 A Q1 L
12 3 4 5 6 7
1---Surface mount 2---RoHS 6, change "R" to "7" means RoHS 5 3---Series name 4---Series code 5--- Narrow input range (10.8-13.2V) 6---Output voltage, Quad 7---Enable, active low
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
10.8 Vdc - 13.2 Vdc Input, 1.23, 2.5, 3.3, -12 Vdc/6, 1.5, 1.5, 2 A Sep. 22, 2009
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Min -0.3 -0.3 -40 -55 Typ Max 15 15 85 125 Unit V V C C Notes
Absolute Maximum Ratings
Parameter Continuous non-operating Input Voltage Remote On/Off Ambient Temperature Storage Temperature
Note: Ratings used beyond the maximum ratings may cause a reliability degradation of the converter or may permanently damage the device.
Input Specifications
Parameter Operating Input Voltage Input Current (full load) Input Current (no load) Remote Off Input Current Input Reflected Ripple Current (rms) Input Reflected Ripple Current (pk-pk) I t Inrush Current Transient Turn-on Voltage Threshold Turn-off Voltage Threshold
2
Min 10.8 -
Typ 12 80 10 10 50 10.5 9.5
Max 13.2 5 150 20 80 1 -
Unit V A mA mA mA
Notes
Use a 1000uF AL-Cap on the input mA As V V
2
CAUTION: This converter is not internally fused. An input line fuse must be used in application. Recommend a fast-acting fuse with maximum rating of 8A on system board. Refer to the fuse manufacture's datasheet for further information. Note: All specifications are typical at 25 C unless otherwise stated.
Output Specifications
Parameter Output Voltage Set Point Load Regulation Line Regulation Regulation Over Temperature (-40deg.C-85deg.C) Ripple and Noise (pk-pk) Vo=1.23V Vo=2.5V Vo=3.3V Vo=-12V Ripple and Noise (rms) Vo=1.23V Vo=2.5V Vo=3.3V Vo=-12V 5 5 5 8 mV mV mV mV Min -2 Typ 30 30 30 40 Max 2 1 1 1 Unit % Vo,set % Vo,set % Vo,set % Vo,set mV mV mV mV Notes Vin=12V, lout=half load
0-20MHz BW, minimum extra output ceramic caps on output
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
10.8 Vdc - 13.2 Vdc Input, 1.23, 2.5, 3.3, -12 Vdc/6, 1.5, 1.5, 2 A Sep. 22, 2009
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Min Vo=1.23V Vo=2.5V Vo=3.3V Vo=-12V 0 0 0 0 Vo=1.23V Vo=2.5V Vo=3.3V Vo=-12V 330 220 80 22 Vo= 1.23V Vo= 2.5V Vo= 3.3V Vo= -12V Typ 150 1 8 50 50 50 50 50 50 200 200 Max 6 1.5 1.5 2 3 12 5 560 470 220 100 100 150 100 150 100 150 100 150 100 150 100 150 400 150 400 150 Unit A A A A %Iout As mS % uF uF uF uF mV uS mV uS mV uS mV uS mV uS mV uS mV uS mV uS di/dt=0.5A/us, Vin=12.0Vdc, Ta=25C,minimum extra output ceramic caps on output
2
Output Specifications (continued)
Parameter Output Current Range Notes
Output DC Current Limit
1
Short Circuit Surge Transient Turn on Time Overshoot at Turn on Output Capacitance
Transient Response
V
Overshoot Settling Time Overshoot Settling Time Overshoot Settling Time Overshoot Settling Time Overshoot Settling Time Overshoot Settling Time Overshoot Settling Time Overshoot Settling Time
50%~75% of Max Load
V
75%~50% of Max Load
V
50%~75% of Max Load
V
75%~50% of Max Load
V
50%~75% of Max Load
V
75%~50% of Max Load
V
50%~75% of Max Load
V
75%~50% of Max Load
Notes: 1. All outputs is shutdown latched when 3.3V, 2.5V, 1.23V output happen overload. Hiccup mode is active during -12V output overload but 3.3V, 2.5V and 1.23V don't be affected operating. 2. All specifications are typical at nominal input, full load at 25C 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
3
NON-ISOLATED DC/DC CONVERTERS
10.8 Vdc - 13.2 Vdc Input, 1.23, 2.5, 3.3, -12 Vdc/6, 1.5, 1.5, 2 A Sep. 22, 2009
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Min Typ 91 300 14 TBD Max Unit % kHz g Calculated Per Bell Core SR-332 (Io=80%load, Ta = 25 C, 9 FIT=10 /MTBF) Notes Vin=12.0V, full load
General Specifications
Parameter Efficiency Switching Frequency Weight FIT Dimensions Inches (L x W x H) Millimeters (L x W x H) 1.77 x 0.90 x 0.49 45.00 x 22.86 x 12.39 -
Note: All specifications are typical at 25 C unless otherwise stated.
Efficiency Data
SRXA-40AQ1L
90.0%
85.0% efficiency 10.8V 12V 13.2V
80.0%
75.0%
70.0% 10% load
25% load
50% load output current
75% load
full load
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
10.8 Vdc - 13.2 Vdc Input, 1.23, 2.5, 3.3, -12 Vdc/6, 1.5, 1.5, 2 A Sep. 22, 2009
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Thermal Derating Curves
The thermal reference point is shown above. For reliable operation this temperature should not exceed 110C. The output power of the module should not exceed the rated power for the module.
Derating curve under normal input Maximum junction temperature of semiconductors derated to 120 degree 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
10.8 Vdc - 13.2 Vdc Input, 1.23, 2.5, 3.3, -12 Vdc/6, 1.5, 1.5, 2 A Sep. 22, 2009
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Ripple and Noise Waveform
Transient Response Waveforms
3.3Vout 50%-75%load 0.5A/us
3.3Vout 75%-50%load 0.5A/us
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
10.8 Vdc - 13.2 Vdc Input, 1.23, 2.5, 3.3, -12 Vdc/6, 1.5, 1.5, 2 A Sep. 22, 2009
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Transient Response Waveforms (continued)
2.5Vout 50%-75%load 0.5A/us
2.5Vout 75%-50%load 0.5A/us
1.23Vout 50%-75%load 0.5A/us
1.23Vout 75%-50%load 0.5A/us
-12Vout 50%-75%load 0.5A/us
-12Vout 75%-50%load 0.5A/us
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
10.8 Vdc - 13.2 Vdc Input, 1.23, 2.5, 3.3, -12 Vdc/6, 1.5, 1.5, 2 A Sep. 22, 2009
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Startup & Shutdown
Rise time
Test Condition: Vin=12V, full load output
Startup time
Startup from on/off Ch1,Ch2,Ch4: 1.23Vout,2.5Vout,3.3Vout CH3: on/off contreller Vin=12V, full load output Shutdown
Startup from on/off Ch4: -12Vout Ch3: on/off contreller Vin=12V, full load output
Test Condition: Vin=12V, full load output
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com
8
NON-ISOLATED DC/DC CONVERTERS
10.8 Vdc - 13.2 Vdc Input, 1.23, 2.5, 3.3, -12 Vdc/6, 1.5, 1.5, 2 A Sep. 22, 2009
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Min -0.3 2.5 0 Typ Max 1 Vin 1 Unit V V mA Notes The remote on/off pin open, Unit off.
Remote On/Off
Parameter Signal Low (Unit On) Signal High (Unit Off) Current Sink Active Low
Recommended remote on/off circuit for active low
Vin+ On/off
Vin+
On/off
Vin-
Vin-
Control with open collector/drain circuit
Control with photocoupler circuit
Vin+
Vcc
Vin+
On/off
On/off
Vin-
Vin-
Control with logic circuit
Permanently on
Input Under-voltage Lockout
Input Current Under-voltage Lockout
Voltage Falling Voltage Rising
V1=9.5V V2=10.5V
V1
V2
Input Voltage (V)
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com
9
NON-ISOLATED DC/DC CONVERTERS
10.8 Vdc - 13.2 Vdc Input, 1.23, 2.5, 3.3, -12 Vdc/6, 1.5, 1.5, 2 A Sep. 22, 2009
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Power Sequence
Vin>=10.8V T3F 3.3Vout
T2F
2.5Vout
T1F
1.2Vout
0
T4S T3S T2S T1S
T4F high On/off Signal
-12Vout
low
T0
T1F-T0<12mS T4F-T0<5mS T1S-T3S<10mS Max(T3F,T2F,T1F)-T3S<10mS Max[(T3F-T3S),(T2F-T2S),(T1F-T1S)]<5mS Min[3.3V/(T3F-T3S),2.5V/(T2F-T2S),1.2V/(T1F-T1S),]<100mV/us 3.3Vout(t)>2.5Vout(t)>1.2Vout(t),when t>T3S
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com
10
NON-ISOLATED DC/DC CONVERTERS
10.8 Vdc - 13.2 Vdc Input, 1.23, 2.5, 3.3, -12 Vdc/6, 1.5, 1.5, 2 A Sep. 22, 2009
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Fundamental Circuit Diagram
Vin+
3.3Vout
2.5Vout
On/off
Controller
1.2Vout
3
-12Vout
GND
Controller
GND
Choke Capacitor Resistor
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com
11
NON-ISOLATED DC/DC CONVERTERS
10.8 Vdc - 13.2 Vdc Input, 1.23, 2.5, 3.3, -12 Vdc/6, 1.5, 1.5, 2 A Sep. 22, 2009
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Layout
Layout of components on top side
Layout of components on bottom side
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com
12
NON-ISOLATED DC/DC CONVERTERS
10.8 Vdc - 13.2 Vdc Input, 1.23, 2.5, 3.3, -12 Vdc/6, 1.5, 1.5, 2 A Sep. 22, 2009
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Mechanical Outline
Pin 1 2 3 4 5
Function Vin ON/OFF GND -12Vout GND
Pin 6 7 8 9
Function GND 1.23Vout 2.5Vout 3.3Vout
Note: This module is recommended and compatible with Pb-Free Reflow Soldering and must be soldered using a reflow profile with a peak temperature of no more than 260 C 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
13
NON-ISOLATED DC/DC CONVERTERS
10.8 Vdc - 13.2 Vdc Input, 1.23, 2.5, 3.3, -12 Vdc/6, 1.5, 1.5, 2 A Sep. 22, 2009
Bel Power, Inc. , a subsidiary of Bel Fuse, Inc.
Revision History
Date 2009-04-16 2009-07-20 Revision A B First release 1. Input specs: Update no load current and remote off current, ripple current (pk-pk), turn on/off voltage; 2. Output specs: Update load/line regulation, ripple and noise, transient response, turn on time, output cap, weight, add note for OCP; 3. Add efficiency curve, thermal derating, NR, TR, startup & shutdown; 4. Update remote on/off, UVLO, SEQ, MD 1. Modify output voltage 2. Update efficiency data and MD 3. Add SCH and Layout Changes Detail Approval HL Lu HL Lu
2009-09-22
C
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.
(c)2009 Bel Fuse Inc. Specifications subject to change without notice. 092209
14
CORPORATE Bel Fuse Inc. 206 Van Vorst Street Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com FAR EAST 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 EUROPE 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

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