DRQ-8/100-L48PBA-C [MURATA]
民用设备,工业设备;
| 型号： | DRQ-8/100-L48PBA-C |
| 厂家： | 
muRata |
| 描述： | 民用设备,工业设备 |
| 文件： | 总15页 (文件大小：1452K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
DRQ-8/100-L48NBxxxx-C
s
Regulated Quarter-Brick 800-Watt Isolated DC-DC Converter
Output (V)
Current (A)
Nominal Input (V)
8.0
100
48
Optimized for distributed power Regulated Intermediate Bus Archi-
tectures (RIBA), the DRQ-8/100-L48NBxxxx-C series offer regulated
outputs in a quarter brick baseplate package.
FEATURES
PRODUCT OVERVIEW
ꢀ
Regulated Intermediate Bus Architecture (RIBA)
The DRQ-8/100-L48NB-C regulated converter
module deliver a 8.0V output @ Vin = 48Vdc in a
quarter brick open frame package at astonishing
efficiency. The fully isolated (1500Vdc) DRQ-
8/100-L48NBxxxx-C series accept a 36 to 60 Volt
DC input voltage range and converts it to a low
Vdc output that drives external point-of-load (PoL)
DC-DC power converters such as Murata Power
Solutions’ tiny Okami series which feature precise
regulation directly at the load. Applications include
datacom and telecom installations, cellular data-
phone repeaters, base stations, instruments and
embedded systems. Wideband output ripple and
noise is a low 100mV, peak-to-peak.
The DRQ’s synchronous-rectifier topology and
fixed frequency operations means excellent effi-
ciencies up to 95.8 %.
ꢀ
95.8% ultra-high efficiency at full load
ꢀ
36V-60V DC input range (48V nominal)
A wealth of electronic protection features include
input under voltage lockout, over voltage lockout
protection, output current limit, current sharing,
short circuit hiccup, Vout overshoot, and over
temperature shutdown. Available options include
various pin lengths and the baseplate. Assembled
using ISO-certified automated surface-mount
techniques, the DRQ series is designed to meet
all UL and IEC emissions, safety and flammability
certifications.
ꢀ
Monotonic startup into pre-bias output
conditions
ꢀ
Over-current & Over-temperature protection
ꢀ
Synchronous rectifier topology
ꢀ
Stable no-load operation
ꢀ
Up to +85° Celsius thermal performance (with
derating)
ꢀ
Remote On/Off enable control
ꢀ
Fully isolated to 1500VDC
ꢀ
Extensive protection features- UVLO, OVLO, OC,
SC, OT
ꢀ
Full safety, emissions and environmental
certifications
ꢀ
UL 60950-1, CAN/CSAC22.2 No. 60950-1,
IEC60950-1, EN60950-1 Certification
ꢀ
ꢁoutꢂ-ꢃ oꢄtional
ꢀinꢁ-ꢂ
ꢇnaꢈle
ꢀinꢁꢆꢂ
ꢃ
ꢉ
ꢊ
ꢄ
ꢀoutꢁ-ꢂ
ꢀ
ꢁꢂ oꢃtional
ꢅ
ꢀoutꢁꢆꢂ
8
ꢀoutꢁꢂꢃ oꢄtional
Figure 1. Bottom View of typical unit
A Single Output Pins Version is availabe where Pin 4 and Pin 8 are removed. The
option (A) allows customers to upgrade the power in applications where the Dual
Pin would require layout cha nges. See the specific mechanical drawings and
performance data.
For full details go to
www.murata-ps.com/rohs
(pending)
www.murata-ps.com/support
MDC_DRQ-8/100-L48NBxxxx-C.D06 Page 1 of 15
DRQ-8/100-L48NBxxxx-C
Regulated Quarter-Brick 800-Watt Isolated DC-DC Converter
PERFORMANCE SPECIFICATIONS SUMMARY AND ORDERING GUIDE
Output
Input
Ripple & Noise
Total
Power
(W)
(mVp-p)
Efficiency
Typ.
Dimensions with baseplate
VOUT
(V)
IOUT
(A, max)
VIN Nom. Range IIN, no load IIN, full load
Root Model ➀
Max.
(V)
(V)
(mA)
(A)
Case (inches)
Case (mm)
DRQ-8/100-L48NB-C
8.0
100
800
150
48
36-60
200
20.8
95.8%
2.3 x 1.45 x 0.57 58.42 x 36.83 x 14.8
➀
➁
Please refer to the part number structure for additional options and complete ordering part numbers.
All specifications are at nominal line voltage and full load, +25 ºC. unless otherwise noted. See detailed specifications. Cout = 700µF, approximately 50% ceramic, 50% Oscon or POSCAP. I/O caps are necessary for our test equipment and
may not be needed for your application.
PART NUMBER STRUCTURE
DR Q - 8 / 100 - L48 N B A S G L1 - C
RoHS 6/6 Compliant
Digital Control - Regulated
Blank = Standard pin length 0.180 in. (4.6mm)
L1 = 0.110 in. (2.79mm)
L2 = 0.145 in. (3.68mm)
Q = Quarter-Brick
Blank = No Power Good Pin Installed (Standard Configuration)
G = Power Good Pin Installed
Nominal Output Voltage
Voltage in Volts (V)
Blank = No Load Share (Standard Configuration)
S = Load Sharing Option
Maximum Rated Output Currrent
Current in Amps (A)
Input Voltage Range
Blank = Dual Output Pins (++/--) (Standard Configuration, See Mechanical
Drawing)
A = Single Output Pins (See Mechanical Drawings)
Z = Dual Output Pins (++/--) (See Mechanical Drawings)
L48 = 36V-60V
(Nom. = 48V)
Baseplate (Standard Configuration)
N= Negative Logic (Standard Configuration)
P=Positive Logic
Note: Some model number com-
binations may not be available.
See website or contact your local
Murata sales representative.
www.murata-ps.com/support
MDC_DRQ-8/100-L48NBxxxx-C.D06 Page 2 of 15
DRQ-8/100-L48NBxxxx-C
Regulated Quarter-Brick 800-Watt Isolated DC-DC Converter
FUNCTIONAL SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
Input Voltage, Continuous
Input Voltage, Transient
Isolation Voltage
On/Off Remote Control
Output Power
Conditions
Minimum
Typical/Nominal
Maximum
Units
Vdc
Vdc
Vdc
Vdc
W
36
48
60
75
100 mS max. duration
Input to output
Referred to -Vin
1500
20
0
0
-55
800
100
125
Output Current
Storage Temperature Range
Current-limited, no damage, short-circuit protected
Vin = Zero (no power)
A
°C
Absolute maximums are stress ratings. Exposure of devices to greater than any of these conditions may adversely affect long-term reliability. Proper operation under conditions other than those
listed in the Performance/Functional Specifications Table is not implied nor recommended.
INPUT
Operating Input Voltage Range
Start up Voltage
36
48
34.5
32.5
60
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
33.0
31.0
2.00
78.0
73.0
2.00
36.0
34.0
4.00
82.0
77.0
4.00
Undervoltage Shutdown
UVLO Hysteresis
Overvoltage Shutdown
Overvoltage Shutdown Recover
Input OVP Hysteresis
Internal Filter Type
80.0
75.0
Pi
External Input fuse
45
A
External Input Capacitance
Input current
140
800
µF
Full Load Conditions
Low Line input current
Inrush Current ➄
Short Circuit input current
No Load input current
Shut-Down input currrent(Off, UV, OT)
Back Ripple Current
GENERAL and SAFETY
Efficiency
Vin = nominal
Vin = minimum
17.30
23.20
20.00
25.00
50
A
A
% of Iin
A
mA
mA
mArms
0.5
200
20
Iout = minimum, unit=ON
300
50
1000
350
Vin=48V, full load
Input to output
Input to Baseplate
Output to Baseplate
95.0
1500
1500
1000
95.8
%
Vdc
Vdc
Vdc
Isolation Voltage
Insulation Safety Rating
Isolation Resistance
Isolation Capacitance
Operational
TBD
1000
MΩ
pF
Certified to UL-60950-1, CSA-C22.2 No.60950-1, IEC/
EN60950-1, 2nd edition
Per Telcordia SR-332, Issue 2, Method 1, Class 1, Ground
Fixed, Tcase=+40°C
Safety
Pending
1500
Calculated MTBF
Hours x 103
KHz
DYNAMIC CHARACTERISTICS
Switching Frequency
Turn On Time
200
Time from Vin reaching UVLO to Vout reaching 10% of
Vout_nominal
Time from enable edge to Vout reaching 10% of
Vout_nominal
Vin Startup Delay
20
30
5
mS
mS
Enable Startup Delay
Vout Rise Time
From 0%~100%
15
mS
µS
50-75-50%, 1A/uS, 4uF/W of external output capacitance,
Dynamic Load Response
500
within 1% of Vout
Dynamic Load Peak Deviation
FEATURES and OPTIONS
Remote On/Off Control
same as above
Conditions
350
Maximum
mV
Units
Minimum
Typical/Nominal
Primary On/Off control (designed to be driving with an open collector logic, Voltages referenced to -Vin)
“N” suffix:
Negative Logic, ON state
Negative Logic, OFF state
Control Current
ON = ground pin or external voltage
OFF = pin open or external voltage
open collector/drain
-0.1
2.4
0.8
20
0.2
Vdc
Vdc
mA
“P” suffix
Positive Logic, OFF state
Positive Logic, ON state
OFF = ground pin or external voltage
ON = pin open or external voltage
-0.1
2.4
0.8
20
Vdc
Vdc
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MDC_DRQ-8/100-L48NBxxxx-C.D06 Page 3 of 15
DRQ-8/100-L48NBxxxx-C
Regulated Quarter-Brick 800-Watt Isolated DC-DC Converter
FUNCTIONAL SPECIFICATIONS (CONT.)
Control Current :
OUTPUT
Total Output Power
Voltage
open collector/drain
0.2
Maximum
800
mA
Units
W
Conditions
Minimum
Typical/Nominal
0
800
Output Voltage: Standard Option
Setting Accuracy
Setting Accuracy
Setting Accuracy
Output Voltage: Load Sharing Option
Setting Accuracy
Setting Accuracy
Setting Accuracy
Overvoltage Protection
Current
7.90
7.97
7.90
7.90
7.75
8.38
7.95
7.75
9.50
8.00
8.00
8.00
8.00
8.20
8.40
8.20
8.00
10.00
8.10
8.03
8.10
8.10
8.65
8.42
8.45
8.25
10.50
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
At 0% Load, No Trim, All Conditions
At 50% Load, No Trim, All Conditions
At 100% Load, No Trim, All Conditions
At 0% Load, No Trim, All Conditions
At 50% Load, No Trim, All Conditions
At 100% Load, No Trim, All Conditions
Output Current Range
Minimum Load
Current Limit Inception
Short Circuit
Short Circuit Current
Short Circuit Duration
(remove short for recovery)
Short circuit protection method
Regulation
0
100
100
130
A
A
A
No minimum load
90% of Vout
110
Hiccup technique, autorecovery within 1% of Vout
Output shorted to ground, no damage
Hiccup current limiting
0.5
Continuous
Non-latching
Line Regulation
Load Regulation (No droop)
Vin = 36-60, Vout = nom., full load
Iout = min. to max., Vin = nom.
20 MHz BW, Cout=700µF, 50% ceramic,
50% OSCON or POSCAP.
0.5
0.5
%
%
Ripple and Noise
100
150
mV pk-pk
Temperature Coefficient (No droop)
Output Capacitance
At all outputs
0.02
% of Vnom./°C
μF
0
10,000
MECHANICAL
2.3 x 1.45 x 0.57
58.4 x 36.83 x 14.8
3.14
Inches
mm
Ounces
Grams
Inches
mm
Outline Dimensions (with baseplate)
Weight (with baseplate)
80
0.06 & 0.04
1.524 & 1.016
Copper alloy
98.4-299
Through Hole Pin Diameter
Through Hole Pin Material
Nickel subplate
Gold overplate
µ-inches
µ-inches
TH Pin Plating Metal and Thickness
4.7-19.6
ENVIRONMENTAL
Operating Ambient Temperature Range
Operating Baseplate Temperature
Storage Temperature
Thermal Protection/Shutdown (with
“B” Suffix)
with derating
-40
-40
-55
85
115
125
°C
°C
°C
Vin = Zero (no power)
Case temperature, measured in the center
130
°C
Electromagnetic Interference
Conducted, EN55022/CISPR22
RoHS rating
External filter required; see
emissions performance test.
B
Class
RoHS-6
Notes
➀
Unless otherwise noted, all specifications apply over the input voltage range, full temperature
➁
Measured at input pin with maximum specified Cin and <500µH inductance between voltage
source and Cin
All models are stable and regulate to specification under no load.
The Remote On/Off Control is referred to -Vin.
Inrush Current is defined as the peak current drawn by the Unit when Unit is enabled after Vin
is present. Iin is defined as the steady-state operating current when Unit is operating at Vin Max
and Rated Power. While Vout is rising, Pout is ≤25% of Rated Power with a resistive load.
range, nominal output voltage and full output load. General conditions are near sea level altitude,
heat sink installed and natural convection airflow unless otherwise specified. All models are
tested and specified with external parallel 1 µF and 10 µF multi-layer ceramic output capacitors.
No external input capacitor is used (see Application Notes). All capacitors are low-ESR types
wired close to the converter. These capacitors are necessary for our test equipment and may not
be needed in the user’s application.
➂
➃
➄
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MDC_DRQ-8/100-L48NBxxxx-C.D06 Page 4 of 15
DRQ-8/100-L48NBxxxx-C
Regulated Quarter-Brick 800-Watt Isolated DC-DC Converter
FUNCTIONAL SPECIFICATIONS (CONT.)
POWER GOOD
Notes
1
1
6
6
-
1
1
1
1
2, 5
3, 5
4
Minimum
Typical/Nominal
Maximum
Units
V
V
V
V
Output Voltage Low (trigger limits)
Output Voltage High (trigger limits)
Input Voltage Low (trigger limits) Rising
Input Voltage High (trigger limits) Rising
Hysteresis
High State Voltage
High State Leakage Current (into Pin)
Low State Voltage
Low State Current (into Pin)
Power Good Signal De-assert Response Time
Power Good Signal Assert Response Time
Power Good Signal Duration
8.2
12.6
42.5
58
1
0
0
0
0
-
-
-
-
-
-
-
-
-
-
-
-
8.6
13.1
45
61
-
5.5
10
0.8
5
V
V
µA
V
mA
ms
ms
ms
0
0
200
3
3
600
Notes
➀
➁
➂
Power-Good signal is referenced to Vout(-). If output voltage is lower than “Output Voltage Low”
➃
Power-Good Signal Duration is defined as the duration the Power-Good signal must stay de-
asserted if a transient fault occurs.
Power-Good assertion & de-assertion must be deglitched to avoid false triggering.
PGood signal should indicate Good when Vin is within operating range and indicate bad before
unit is shut-down due to UV or OV.
or higher than “Output Voltage High,” PG will be set to BAD.
Power-Good Signal De-assert Response Time is defined as the duration between the fault occur-
ring and the Power-Good Signal de-asserting.
Power-Good Signal Assert Response Time is defined as the duration between unit powering up
with no faults and the Power Good Signal asserting.
➄
➅
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MDC_DRQ-8/100-L48NBxxxx-C.D06 Page 5 of 15
DRQ-8/100-L48NBxxxx-C
Regulated Quarter-Brick 800-Watt Isolated DC-DC Converter
PERFORMANCE DATA
Power Loss vs. Line Voltage and Load Current @ +25°C
Efficiency vs. Line Voltage and Load Current @ +25°C
45
ꢃ8ꢁ00
ꢃꢂꢁ00
ꢃꢀꢁ00
ꢃꢄꢁ00
ꢃ0ꢁ00
88ꢁ00
8ꢂꢁ00
8ꢀꢁ00
40
35
30
25
36V Power loss
ꢆꢂꢉin
20
15
10
5
48V Power loss
60V Power loss
ꢀ8ꢉin
ꢂ0ꢉin
0
ꢅ0
ꢆ0
ꢇ0
Load (A)
ꢈ0
ꢃ0
0
10
20
30
40
50
60
70
80
90
100
Output Current (A)
Dual Output Pins Maximum Current Temperature Derating at sea level
(Vin = 48V, airflow from Vin to Vout, with heatsink)*
Single Output Pins Maximum Current Temperature Derating at sea level
(Vin = 48V, airflow from Vin to Vout, with heatsink)*
ꢄ0ꢀ
ꢅ0ꢁ
ꢅ00
ꢄꢁ
ꢄ0
8ꢁ
80
ꢃꢁ
ꢃ0
ꢂꢁ
ꢂ0
ꢁꢁ
ꢁ0
ꢀꢁ
ꢀ0
ꢄ00
ꢃꢀ
ꢃ0
8ꢀ
80
ꢂꢀ
ꢂ0
ꢁꢀ
ꢁ0
ꢀꢀ
ꢁ00ꢆꢇꢈ
ꢅ00ꢆꢇꢈ
ꢉ00ꢆꢇꢈ
ꢂ00ꢆꢇꢈ
ꢀ00ꢆꢇꢈ
ꢉ00ꢆꢇꢈ
ꢅꢀ
ꢀ0
ꢀꢀ
ꢁ0
ꢁꢀ
ꢂ0
ꢂꢀ
80
8ꢀ
ꢀꢁ
ꢁ0
ꢁꢁ
ꢂ0
ꢂꢁ
ꢃ0
ꢃꢁ
80
8ꢁ
ꢆꢇꢈꢉ ꢃꢊCꢅ
ꢆꢇꢈꢉ ꢃꢊCꢅ
Single Output Pins Maximum Output Power Temperature Derating at sea level
(Vin = 48V, airflow from Vin to Vout, with heatsink)*
Dual Output Pins Maximum Output Power Temperature Derating at sea level
(Vin = 48V, airflow from Vin to Vout, with heatsink)*
8ꢂ0ꢁ00
800ꢁ00
ꢄꢂ0ꢁ00
ꢄ00ꢁ00
ꢃꢂ0ꢁ00
ꢃ00ꢁ00
ꢂꢂ0ꢁ00
ꢂ00ꢁ00
ꢀꢂ0ꢁ00
ꢀ00ꢁ00
8ꢁ0
800
ꢄꢁ0
ꢄ00
ꢃꢁ0
ꢃ00
ꢁꢁ0
ꢁ00
ꢂꢁ0
ꢂ00
ꢀꢁ0
ꢀ00
ꢃ00ꢅꢆꢇ
ꢀ00ꢅꢆꢇ
ꢈ00ꢅꢆꢇ
ꢃ00ꢅꢆꢇ
ꢂ00ꢅꢆꢇ
ꢈ00ꢅꢆꢇ
ꢀꢂ
ꢂ0
ꢂꢂ
ꢃ0
ꢃꢂ
ꢄ0
ꢄꢂ
80
8ꢂ
ꢂꢁ
ꢁ0
ꢁꢁ
ꢃ0
ꢃꢁ
ꢄ0
ꢄꢁ
80
8ꢁ
ꢆꢇꢈꢉ ꢃꢊCꢅ
ꢆꢇꢈꢉ ꢃꢊCꢅ
See Page 8 for heatsink information.
NOTE: The heatsink is not available as an option. It is only used in the thermal testing of this device.
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MDC_DRQ-8/100-L48NBxxxx-C.D06 Page 6 of 15
DRQ-8/100-L48NBxxxx-C
Regulated Quarter-Brick 800-Watt Isolated DC-DC Converter
MECHANICAL SPECIFICATIONS (THROUGH-HOLE MOUNT)
Bꢁꢀꢀꢁꢇ ꢃIꢄW
Dual ꢁutꢅut ꢂins
ꢀꢁꢂ ꢃIꢄW
Baseꢅlate ꢁꢅtion
Bꢁꢀꢀꢁꢇ ꢃIꢄW
ꢆIDꢄ ꢃIꢄW
ꢆingle ꢁutꢅut ꢂins
ꢊꢋꢌꢋ oꢅtionꢍ
ꢆꢄꢄ ꢈꢁꢀꢄ ꢉ
ꢂin ꢇaterial
Dimensions are in inches (mm shown for ref. only).
INPUT/OUTPUT CONNECTIONS
PIN FUNCTION PIN FUNCTION
ꢀꢁꢂꢃꢄ ꢅꢆꢇꢈꢉ ꢊꢃꢋꢌꢉꢍꢎꢂꢋꢆ
1
2
3
4
Vin(+)
Enable
Vin(-)
5
6
7
8
Vout(-)
PG*
Vout(+)
Vout(+)*
Vout(-) *
Tolerances (unless otherwise specified):
.XX ꢀ.ꢀ0 (ꢀ.ꢁ)
.XXX ꢀ.ꢀꢂꢀ (ꢀ.0ꢁ)
Angles 02
* These pins are optinal. Please refer to the part
number structure.
Components are shown for reference only
and may vary between units.
Recoꢀꢀended ꢁootꢂrint
ꢃingle ꢄutꢂut ꢅins
Recoꢀꢀended ꢁootꢂrint
Dual ꢃutꢂut ꢄins
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MDC_DRQ-8/100-L48NBxxxx-C.D06 Page 7 of 15
DRQ-8/100-L48NBxxxx-C
Regulated Quarter-Brick 800-Watt Isolated DC-DC Converter
MECHANICAL SPECIFICATIONS (THROUGH-HOLE MOUNT)
ꢄꢃꢋ ꢊIꢁW
Baseꢆlateꢇꢈeatsink ꢃꢆtionꢉ
Baseꢆlate ꢃꢆtion
ꢀIDꢁ ꢊIꢁW
ꢀꢁꢁ ꢂꢃꢄꢁ ꢅ
ꢀꢁꢁ ꢂꢃꢄꢁ ꢅ
Bꢃꢄꢄꢃꢌ ꢊIꢁW
INPUT/OUTPUT CONNECTIONS
PIN FUNCTION PIN FUNCTION
1
2
3
4
Vin(+)
Enable
Vin(-)
5
6
7
8
Vout(-)
PG*
Vout(+)
Vout(+)*
Vout(-)*
* These pins are optional. Please refer to
the part number structure.
Dimensions are in inches (mm shown for ref. only).
ꢀꢁꢂꢃꢄ ꢅꢆꢇꢈꢉ ꢊꢃꢋꢌꢉꢍꢎꢂꢋꢆ
Tolerances (unless otherwise specified):
.XX ꢀ.ꢀ0 (ꢀ.ꢁ)
.XXX ꢀ.ꢀꢂꢀ (ꢀ.0ꢁ)
Angles 02
Components are shown for reference only
and may vary between units.
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MDC_DRQ-8/100-L48NBxxxx-C.D06 Page 8 of 15
DRQ-8/100-L48NBxxxx-C
Regulated Quarter-Brick 800-Watt Isolated DC-DC Converter
SHIPPING TRAYS AND BOXES, THROUGH-HOLE MOUNT
9.92
REF
9.92
REF
EACH STATIC DISSIPATIVE
POLYETHYLENE FOAM TRAY
ACCOMMODATES 15 CONVERTERS
IN A 3 X 5 ARRAY
0.88
REF
CARTON ACCOMMODATES
FOUR (4) TRAYS YIELDING
60 CONVERTERS PER CARTON
MPQ=60
10.50±.25
11.00±.25
SHIPPING TRAY DIMENSIONS
DRQ modules are supplied in a 15-piece (5 x 3) shipping tray. The tray is an anti-static closed-cell polyethylene foam. Dimensions are shown below.
252.0 +.000
[9.92] -.062
46.36
[1.825]
TYP
252.0 +.000
[9.92] -.062
15.875 [0.625]
TYP
60.96 [2.400]
TYP
18.67 [0.735]
C
18.42
[0.725] TYP
L
6.35 [.25] R TYP
6.35 [.25] CHAMFER
TYP (4-PL)
36.83
[1.450]
TYP
Notes:
1. Material: Dow 220 antistat ethafoam
(Density: 34-35 kg/m3)
2. Dimensions: 252 x 252 x 19.1 mm
5 x 3 array (15 per tray)
3. All dimensions in millimeters [inches]
4. Tolerances unless otherwise specified: +1/-0
www.murata-ps.com/support
MDC_DRQ-8/100-L48NBxxxx-C.D06 Page 9 of 15
DRQ-8/100-L48NBxxxx-C
Regulated Quarter-Brick 800-Watt Isolated DC-DC Converter
But if you attempt to measure the current in one of the converters using a
series shunt, remember that the current meter itself may introduce enough
finite resistance to affect the readings. (Hint: Use a non-contacting “clamp-on”
Hall effect DC current meter with zero IR loss.)
TECHNICAL NOTES
Load Sharing
Load sharing occurs when two or more DRQ-8/100-L48NB-Cs are connected
in parallel at both the input and output terminals to supply greater output cur-
rent than one unit alone or to offer system redundancy for moderate loads. If
one converter fails, the other converter(s) will carry the load until the system is
repaired.
[4] If you add the optional input filters, use identical components with the
same layout.
[5] Operate both converters in the same temperature and airflow environ-
ment. Under load sharing, small differences in cooling can amplify into load
imbalances.
The DRQ-8/100-L48NB-C’s design allows load sharing using the “droop”
method, also called the “direct connect” technique. Simply put, at light loads,
the converter with slightly higher output voltage will carry more of the output
current. Since the DRQ-8/100-L48NB-C’s synchronous rectifier design will not
accept appreciable reverse output current, starting at zero load, the DRQ-
8/100-L48NB-C with the higher output voltage will carry more of the full load
[6] Avoid operation near the low input voltage limit of the converter. Another
subtle factor here is the external source impedance of the input supply. A
source with higher source impedance at full load may make the net input
voltage seen by the converter close to its minimum input voltage. Be sure to
until the voltage at the output drops to that of the lower DRQ-8/100-L48NB-C’s.
account for the decrease in effective input voltage under load.
Load Sharing Guidelines
If you wish to operate two or more DRQ-8/100-L48NB-C’s in load sharing, use
these guidelines:
For battery sources, this means that the batteries should be freshly charged
and that the AC trickle charger is in good working order. Note that older batter-
ies increase their internal cell impedance even if their no-load output voltage
appears acceptable. Remember that what counts here is the voltage seen at
the DRQ-8/100-L48NB-C input connections with full current.
[1] Operate both converters connected in parallel to the same 48V input
power source. This simplifies the design and makes more balanced power
sharing. Using two different 48V input supplies must be carefully analyzed to
avoid overloading one of the converters and is not recommended.
[7] As with any system design, thoroughly test the DRQ-8/100-L48NB-C’s
connected in load sharing before committing the design to a real application.
CAUTION – This converter is not internally fused. To avoid danger to persons
or equipment and to retain safety certification, the user must connect an
external fast-blow input fuse as listed in the specifications. Be sure that the PC
board pad area and etch size are adequate to provide enough current so that
the fuse will blow with an overload.
ꢂIꢉ
ꢂꢄꢇꢈ
DRQ1
ꢀꢂout
ꢀꢁ8ꢂ
ꢃꢄWꢅR
ꢆꢄꢇRCꢅ
IꢋꢄꢊD
Power-Good Signal
RꢋꢄꢊD
ꢂIꢉ
ꢂꢄꢇꢈ
DRQ2
The Power Good signal is a non-latching open-collector output that is Low
during normal operation and is pulled High by an internal 3.3V rail through a
5.11k resistor when any of the following conditions occur:
• Over-Temperature
ꢄꢃꢈIꢄꢉꢊꢋ Iꢉꢃꢇꢈ ꢌIꢋꢈꢅRꢆ
Figure 2. Load Sharing Block Diagram
• Over-Current
• Vout is outside of the DC Output Band while Vin is within the Vin Operating
Range
• Vin is within the Vin Operating Range but the unit is not operating (to deter-
mine if one Unit used in a parallel configuration is not operating)
• Vin is outside of the Vin Operating Range
Make sure the single 48V input source can supply the total current needed
by all the parallel-connected DRQ-8/100-L48NB-C’s. (Actually, it is possible
to rate the full system at more than the current capacity of a single DRQ-
8/100-L48NB-C. However, you now lose the redundancy protection feature.)
Start Up Considerations
When power is first applied to the DC/DC converter, there is some risk of start
up difficulties if you do not have both low AC and DC impedance and adequate
regulation of the input source. Make sure that your source supply does not
allow the instantaneous input voltage to go below the minimum voltage at all
times.
[2] Use conservative loading. Do not assume for example that two parallel
DRQ-8/100-L48NB-C’s can always supply “times two” amounts of output cur-
rent. Allow for limits in input voltage and other factors.
If one DRQ-8/100-L48NB-C overloads while in load share, it will protect
itself by entering the overcurrent mode. If the whole system is running close
to maximum output current, the remaining good DRQ-8/100-L48NB-C will
soon also enter overcurrent mode. These two events probably will not happen
together, possibly leaving the system operating in degraded mode for awhile.
The solution here is conservative design to avoid getting close to the load
limits.
Use a moderate size capacitor very close to the input terminals. You may
need two or more parallel capacitors. A larger electrolytic or ceramic cap sup-
plies the surge current and a smaller parallel low-ESR ceramic cap gives low
AC impedance.
[3] Make the input wiring lengths and wire gauges identical on both inputs
and outputs. If in doubt, make some precision measurements under full load.
www.murata-ps.com/support
MDC_DRQ-8/100-L48NBxxxx-C.D06 Page 10 of 15
DRQ-8/100-L48NBxxxx-C
Regulated Quarter-Brick 800-Watt Isolated DC-DC Converter
Remember that the input current is carried both by the wiring and the
ground plane return. Make sure the ground plane uses adequate thickness
copper. Run additional bus wire if necessary.
possibility of sustained input voltage reversal which is not current-limited. For
greatest safety, we recommend a fast blow fuse installed in the ungrounded
input supply line.
On/Off Control
Input Under-Voltage Shutdown and Start-Up Threshold
The input-side, remote On/Off Control function (pin 2) can be ordered to oper-
ate with either logic type:
Under normal start-up conditions, converters will not begin to regulate properly
until the rising input voltage exceeds and remains at the Start-Up Threshold
Voltage (see Specifications). Once operating, converters will not turn off until
the input voltage drops below the Under-Voltage Shutdown Limit. Subsequent
restart will not occur until the input voltage rises again above the Start-Up
Threshold. This built-in hysteresis prevents any unstable on/off operation at a
single input voltage.
Negative (“N” suffix): Negative-logic devices are off when pin 2 is left open
(or pulled high, applying +2.4V to 20V), and on when pin 2 is pulled low (-0.1V
to 0.8V) with respect to –Input as shown in Figure 3.
Positive (“P” suffix): Positive-logic devices are on when pin 2 is left open (or
pulled high, applying +2.4V to +20V), and off when pin 2 is pulled low (-0.1V to
0.8V) with respect to –Input as shown in Figure 3.
Start-Up Time
Assuming that the output current is set at the rated maximum, the Vin to Vout
Start-Up Time (see Specifications) is the time interval between the point when
the rising input voltage crosses the Start-Up Threshold and the fully loaded
output voltage enters and remains within its specified accuracy band. Actual
measured times will vary with input source impedance, external input capaci-
tance, input voltage slew rate and final value of the input voltage as it appears
at the converter.
ꢈꢇIꢁ
ꢈꢇCC
ꢀꢁꢂꢀꢃꢃ
CꢀꢁꢄRꢀꢅ
These converters include a soft start circuit to moderate the duty cycle of its
PWM controller at power up, thereby limiting the input inrush current.
The On/Off Remote Control interval from On command to Vout (final 5%)
assumes that the converter already has its input voltage stabilized above the
Start-Up Threshold before the On command. The interval is measured from the
On command until the output enters and remains within its specified accuracy
band. The specification assumes that the output is fully loaded at maximum
rated current. Similar conditions apply to the On to Vout regulated specification
such as external load capacitance and soft start circuitry.
ꢆꢇIꢁ
Figure 3. Driving the Negative Logic On/Off Control Pin
Dynamic control of the remote on/off function is best accomplished with
a mechanical relay or an open-collector/open-drain drive circuit (optically
isolated if appropriate). The drive circuit should be able to sink appropriate cur-
rent (see Performance Specifications) when activated and withstand appropri-
ate voltage when deactivated. Applying an external voltage to pin 2 when no
input power is applied to the converter can cause permanent damage to the
converter.
Recommended Input Filtering
The user must assure that the input source has low AC impedance to provide
dynamic stability and that the input supply has little or no inductive content,
including long distributed wiring to a remote power supply. The converter will
operate with no additional external capacitance if these conditions are met.
For best performance, we recommend installing a low-ESR capacitor
immediately adjacent to the converter’s input terminals. The capacitor should
be a ceramic type such as the Murata GRM32 series or a polymer type. Make
sure that the input terminals do not go below the undervoltage shutdown volt-
age at all times. More input bulk capacitance may be added in parallel (either
electrolytic or tantalum) if needed.
Input Fusing
Certain applications and/or safety agencies may require fuses at the inputs of
power conversion components. Fuses should also be used when there is the
ꢀuse
ꢇꢅIꢆ
ꢇꢅIꢆ
ꢇꢅ
ꢂ
Recommended Output Filtering
The converter will achieve its rated output ripple and noise with no additional
external capacitor. However, the user may install more external output capaci-
tance to reduce the ripple even further or for improved dynamic response.
Again, use low-ESR ceramic (Murata GRM32 series) or polymer capacitors.
Mount these close to the converter. Measure the output ripple under your load
conditions.
RꢁꢂꢃD
ꢄꢅIꢆ
ꢄꢅIꢆ
ꢄꢅ
ꢂ
Figure 4. Input Fusing
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MDC_DRQ-8/100-L48NBxxxx-C.D06 Page 11 of 15
DRQ-8/100-L48NBxxxx-C
Regulated Quarter-Brick 800-Watt Isolated DC-DC Converter
Use only as much capacitance as required to achieve your ripple and noise
objectives. Excessive capacitance can make step load recovery sluggish or
possibly introduce instability. Do not exceed the maximum rated output capaci-
tance listed in the specifications.
Note that these are AVERAGE measurements. The converter will accept brief
increases in current or reduced airflow as long as the average is not exceeded.
Note that the temperatures are of the ambient airflow, not the converter
itself which is obviously running at higher temperature than the outside air.
Input Ripple Current and Output Noise
Murata Power Solutions makes Characterization measurements in a closed
cycle wind tunnel with calibrated airflow. We use both thermocouples and an
infrared camera system to observe thermal performance. As a practical matter,
it is quite difficult to insert an anemometer to precisely measure airflow in
most applications. Sometimes it is possible to estimate the effective airflow if
you thoroughly understand the enclosure geometry, entry/exit orifice areas and
the fan flowrate specifications.
All models in this converter series are tested and specified for input reflected
ripple current and output noise using designated external input/output com-
ponents, circuits and layout as shown in the figures below. The Cbus and Lbus
components simulate a typical DC voltage bus.
Minimum Output Loading Requirements
All models regulate within specification and are stable under no load to full
load conditions. Operation under no load might however slightly increase
output ripple and noise.
CAUTION: If you exceed these Derating guidelines, the converter may have
an unplanned Over Temperature shut down. Also, these graphs are all collected
near Sea Level altitude. Be sure to reduce the derating for higher altitude.
Thermal Shutdown
To prevent many over temperature problems and damage, these converters
include thermal shutdown circuitry. If environmental conditions cause the
temperature of the DC/DC’s to rise above the Operating Temperature Range
up to the shutdown temperature, an on-board electronic temperature sensor
will power down the unit. When the temperature decreases below the turn-on
threshold, the converter will automatically restart. There is a small amount of
hysteresis to prevent rapid on/off cycling.
Output Fusing
The converter is extensively protected against current, voltage and temperature
extremes. However your output application circuit may need additional protec-
tion. In the extremely unlikely event of output circuit failure, excessive voltage
could be applied to your circuit. Consider using an appropriate fuse in series
with the output.
Output Current Limiting
CAUTION: If you operate too close to the thermal limits, the converter may
shut down suddenly without warning. Be sure to thoroughly test your applica-
tion to avoid unplanned thermal shutdown.
Current limiting inception is defined as the point at which full power falls below
the rated tolerance. See the Performance/Functional Specifications. Note par-
ticularly that the output current may briefly rise above its rated value in normal
operation as long as the average output power is not exceeded. This enhances
reliability and continued operation of your application. If the output current is
too high, the converter will enter the short circuit condition.
Temperature Derating Curves
The graphs in this data sheet illustrate typical operation under a variety of
conditions. The Derating curves show the maximum continuous ambient air
temperature and decreasing maximum output current which is acceptable
under increasing forced airflow measured in Linear Feet per Minute (“LFM”).
TO
CURRENT
PROBE
OSCILLOSCOPE
+VIN
-VIN
ꢖꢗꢆꢔꢘ
LBUS
+
–
+
–
VIN
C
IN
RꢅꢆꢇD
ꢌCꢆꢕꢋ
Cꢀ
Cꢄ
-ꢗꢆꢔꢘ
CIN = 300µF, ESR < 700mΩ @ 100kHz
LBUS = <500µH
Cꢀ ꢁ ꢀꢂꢃ
Cꢄ ꢁ ꢀ0ꢂꢃ
ꢅꢆꢇD ꢄ-ꢈ IꢉCꢊꢋꢌ ꢍꢎꢀ-ꢏꢐꢑꢑꢒ ꢃRꢆꢓ ꢓꢆDꢔꢅꢋ
Figure 5. Measuring Input Ripple Current
Figure 6. Measuring Output Ripple and Noise (PARD)
www.murata-ps.com/support
MDC_DRQ-8/100-L48NBxxxx-C.D06 Page 12 of 15
DRQ-8/100-L48NBxxxx-C
Regulated Quarter-Brick 800-Watt Isolated DC-DC Converter
Output Short Circuit Condition
Output Capacitive Load
When a converter is in current-limit mode, the output voltage will drop as the
output current demand increases. If the output voltage drops too low (approxi-
mately 97% of nominal output voltage for most models), the PWM controller
will shut down. Following a time-out period, the PWM will restart, causing
the output voltage to begin rising to its appropriate value. If the short-circuit
condition persists, another shutdown cycle will initiate. This rapid on/off cycling
is called “hiccup mode.” The hiccup cycling reduces the average output cur-
rent, thereby preventing excessive internal temperatures and/or component
damage.
These converters do not require external capacitance added to achieve
rated specifications. Users should only consider adding capacitance to reduce
switching noise and/or to handle spike current load steps. Install only enough
capacitance to achieve noise objectives. Excess external capacitance may
cause degraded transient response and possible oscillation or instability.
NOTICE—Please use only this customer data sheet as product documentation
when laying out your printed circuit boards and applying this product into your
application. Do NOT use other materials as official documentation such as adver-
tisements, product announcements, or website graphics.
The “hiccup” system differs from older latching short circuit systems
because you do not have to power down the converter to make it restart. The
system will automatically restore operation as soon as the short circuit condi-
tion is removed.
We strive to have all technical data in this customer data sheet highly accu-
rate and complete. This customer data sheet is revision-controlled and dated.
The latest customer data sheet revision is normally on our website (www
.murata-ps.com) for products which are fully released to Manufacturing. Please
be especially careful using any data sheets labeled “Preliminary” since data
may change without notice.
www.murata-ps.com/support
MDC_DRQ-8/100-L48NBxxxx-C.D06 Page 13 of 15
DRQ-8/100-L48NBxxxx-C
Regulated Quarter-Brick 800-Watt Isolated DC-DC Converter
Emissions Performance, Model DRQ-8/100-L48NB-C
[3] Conducted Emissions Test Results
Murata Power Solutions measures its products for radio frequency emissions
against the EN 55022 and CISPR 22 standards. Passive resistance loads are
employed and the output is set to the maximum voltage. If you set up your
own emissions testing, make sure the output load is rated at continuous power
while doing the tests.
The recommended external input and output capacitors (if required) are
included. Please refer to the fundamental switching frequency. All of this
information is listed in the Product Specifications. An external discrete filter is
installed and the circuit diagram is shown below.
ꢉCC
Rꢊꢋ
ꢀꢄ
ꢀꢃ
ꢈ
ꢈ
Cꢄ Cꢃ Cꢎ
Cꢌ Cꢏ
ꢀꢁꢂD
Cꢅ Cꢆ
Cꢄꢃ
DCꢇDC
-ꢌ8ꢉ
ꢍꢋD
C8 Cꢐ Cꢄ0 Cꢄꢄ
Graph 1. Conducted emissions performance, Positive Line,
CISPR 22, Class B, half load
ꢍꢋD
Figure 7. Conducted Emissions Test Circuit
[1] Conducted Emissions Parts List
Reference
Part Number
Description
SMD CERAMIC-100V-
1000nF-X7R-1210
SMD CERAMIC100V-100nF-
10%-X7R-1206
Vendor
C1, C2, C3, C4, C5 GRM32ER72A105KA01L
Murata
C6
GRM319R72A104KA01D
PG0060T
Murata
Pulse
COMMON MODE-473uH-
25%-14A
L1, L2
SMD CERAMIC630V-0.22uF-
10%-X7R-2220
Aluminum100V-220Uf-
10%-long lead
C8, C9, C10, C11 GRM55DR72J224KW01L
Murata
Nichicon
C7
UHE2A221MHD
NA
C12
Graph 2. Conducted emissions performance, Negative Line,
CISPR 22, Class B, half load
[2] Conducted Emissions Test Equipment Used
Hewlett Packard HP8594L Spectrum Analyzer – S/N 3827A00153
[4] Layout Recommendations
Most applications can use the filtering which is already installed inside the
converter or with the addition of the recommended external capacitors. For
greater emissions suppression, consider additional filter components and/or
shielding. Emissions performance will depend on the user’s PC board layout,
the chassis shielding environment and choice of external components. Please
refer to Application Note GEAN-02 for further discussion.
2Line V-networks LS1-15V 50Ω/50Uh Line Impedance Stabilization Network
Since many factors affect both the amplitude and spectra of emissions, we
recommend using an engineer who is experienced at emissions suppression.
www.murata-ps.com/support
MDC_DRQ-8/100-L48NBxxxx-C.D06 Page 14 of 15
DRQ-8/100-L48NBxxxx-C
Regulated Quarter-Brick 800-Watt Isolated DC-DC Converter
Vertical Wind Tunnel
Murata Power Solutions employs a computer controlled
custom-designed closed loop vertical wind tunnel, infrared
video camera system, and test instrumentation for accurate
airflow and heat dissipation analysis of power products.
The system includes a precision low flow-rate anemometer,
IR Transparent
optical window
Variable
speed fan
variable speed fan, power supply input and load controls,
temperature gauges, and adjustable heating element.
Unit under
test (UUT)
The IR camera monitors the thermal performance of the
Unit Under Test (UUT) under static steady-state conditions. A
special optical port is used which is transparent to infrared
wavelengths.
IR Video
Camera
Both through-hole and surface mount converters are
soldered down to a 10" x 10" host carrier board for realistic
heat absorption and spreading. Both longitudinal and trans-
verse airflow studies are possible by rotation of this carrier
board since there are often significant differences in the heat
dissipation in the two airflow directions. The combination of
adjustable airflow, adjustable ambient heat, and adjustable
Input/Output currents and voltages mean that a very wide
range of measurement conditions can be studied.
Heating
element
Precision
low-rate
anemometer
3” below UUT
The collimator reduces the amount of turbulence adjacent
to the UUT by minimizing airflow turbulence. Such turbu-
lence influences the effective heat transfer characteristics
and gives false readings. Excess turbulence removes more
heat from some surfaces and less heat from others, possibly
causing uneven overheating.
Ambient
temperature
sensor
Airflow
collimator
Both sides of the UUT are studied since there are different
thermal gradients on each side. The adjustable heating element
and fan, built-in temperature gauges, and no-contact IR camera mean
that power supplies are tested in real-world conditions.
Figure 8. Vertical Wind Tunnel
Soldering Guidelines
Murata Power Solutions recommends the specifications below when installing these converters. These specifications vary depending on the solder type. Exceeding these specifica-
tions may cause damage to the product. Your production environment may differ; therefore please thoroughly review these guidelines with your process engineers.
Wave Solder Operations for through-hole mounted products (THMT)
For Sn/Ag/Cu based solders:
For Sn/Pb based solders:
Maximum Preheat Temperature 115° C.
Maximum Preheat Temperature 105° C.
Maximum Pot Temperature
Maximum Solder Dwell Time
270° C.
Maximum Pot Temperature
250° C.
7 seconds Maximum Solder Dwell Time
6 seconds
This product is subject to the following operating requirements
and the Life and Safety Critical Application Sales Policy:
Refer to: http://www.murata-ps.com/requirements/
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
ISO 9001 and 14001 REGISTERED
Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other
technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply
the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without
notice.
© 2019 Murata Power Solutions, Inc.
www.murata-ps.com/support
MDC_DRQ-8/100-L48NBxxxx-C.D06 Page 15 of 15
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