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Q-ClassConverters
QHS50-018 Model
OBSOLETE PRODUCT
Model
Parameter
1.8V
Output Voltage Setpoint
Line/Load Regulation
1.78 – 1.82
Vdc
0.1%, 0.2%
% Vo
1.75 – 1.85
Vdc
90-110
%Vo,nom
+10
%Vo,nom
Max
100
mVp-p
Max
Output total regulation
Output adjust
Remote-sense Comp.
Output Ripple & Noise (note 2)
Output Current
Units
Min
0.5
A
Max
50
A
Efficiency (48V, Full load, 25C)
Typ
88%
%
External Capacitance
Max
10,000
μF
Transient Response (typ) (note3)
ΔVo
150
mV
Ts
300
μs
25% step, 1A/μs
Over-voltage trip point – static
2.1 - 2.3
- dynamic
Over-current trip point
max 2.6
Typ
57
V
A
All specifications at Ta=25C, Vin=48V, 300 LFM unless otherwise specified
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com/support
Technical enquiries email: sales@murata-ps.com, tel: +508 339 3000
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QHS50-018_6201031512_D01_22/04/08
Q-ClassConverters
Murata Power Solutions
QHS50-018 Model
Parameter
Conditions
Input
Input Voltage (Vin)
Reflected Ripple Current (see note 1)
Input Current
Inrush Transient
Input Voltage Transient 100mS 10% duty cycle
Undervoltage Lockout
Turn-on
Turn-off
Over-voltage lockout
Turn-off
Turn-on
Input-Output
Resistance; input-output
Operating Ambient
Storage
Isolation
Temperature
Protection
Over-Temperature
Min.
Typ.
Max.
Units
36
--
48
--
32
31
76
75
1500
10
-40
-40
75
10
3
0.2
100
35
34
80
79
---
85
125
Vdc
mA p-p
A
A2s
V
Vdc
Vdc
Vdc
Vdc
Vdc
Mohm
°C
°C
--
120
--
Deg C
Measured on PCB
Physical Information Dimensions
2.28”L x 1.45” W x 0.47”H (57.91 x 36.83 x 11.8 mm)
MTBF(Bellcore)
Calculated at 40C ambient, 100% Iomax:
1,000,000 Hrs
Safety
Complies with IEC/EN/CSA/UL 60950, provides basic insulation, input to output.
c-UL-us (US and Canada) recognized. TUV (Bauart) approved.
Thermal Derating Transverse Airflow Tj=110C
Thermal Derating Parallel Airflow Tj=125C
55
55
50
50
45
Current (A)
Current (A)
45
40
35
30
40
35
30
200lfm
300lfm
400lfm
25
200lfm
300lfm
400lfm
25
20
20
15
10
15
20
10
20
30
40
50
60
Ambient Temp. (C)
70
40
50
60
70
80
Ambient Temp. (C)
80
Thermal Derating Transverse Airflow Tj=125C
55
Therm al Derating Parallel Airflow Tj =110C
50
50
45
Currewnt (A)
55
40
45
Current (A)
30
40
35
35
30
30
20
200lfm
300lfm
400lfm
25
200lfm
300lfm
400lfm
25
20
15
15
10
10
20
30
40
50
60
70
20
80
Am bient Tem p. (C)
30
40
50
60
Ambient Temp. (C)
70
80
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2
QHS50-018_6201031512_D01_22/04/08
Q-ClassConverters
Murata Power Solutions
QHS50-018 Model
x
Pin Assignments
Pin #
1
2
3
Description
Vin (+)
Enable
Vin(-)
Pin #
4
5
6
Description
Vout(-)
Sense Vo adj
Pin #
7
8
Description
Sense +
Vo (+)
Notes:
1. Input Reflected Ripple is specified when measured with the filter shown below.
is
ic
L2
Vin
12uF
220uF,
ESR<0.1 Ohms
@ 100kHz
33uF,
ESR<0.7 Ohms
@ 100kHz
DC-DC
Converter
RTN
2. Output Ripple and noise is specified when measured with a 10uF tantalum and a 1uF ceramic
capacitor at the converter output pins.
3. Transient response is specified without a capacitor at the output of the converter.
4. The Enable signal is Logic Low. It is referenced to Vi-. The pin should be tied to Vi- if it is not
used. Isink = 1mA max, Voff = 15V max.
www.murata-ps.com/support
3
QHS50-018_6201031512_D01_22/04/08
Q-ClassConverters
Murata Power Solutions
QHS50-018 Model
QHS50-018 Output Impedance
Output Ripple and Noise (Vin=48V, Io=50A, full BW)
Output Ripple and Noise (Vin=48V, Io=50A, 20Mz BW)
Output Voltage Response to Step Load (50-75% load step, di/dt = 1A/us, Tamb=25C, Vin=48V)
www.murata-ps.com/support
4
QHS50-018_6201031512_D01_22/04/08
Q-ClassConverters
Murata Power Solutions
QHS50-018 Model
QHS50-018 Efficiency
Input Reflected Ripple (Vin=48V, Iout=50A)
90
PM3380A
88
ch1
ch1:
pkpk= 1.51mV
86
Efficiency (%)
84
82
80
75V
78
48V
76
36V
T
74
1
72
70
0
10
20
30
Current (A)
40
50
60
CH1
PM3380A
Vin = 48V Iout = 0A Local O/P Sensing
ch1
PM3380A
ch1:
BWL MTB5.00us- 1.06dv ch1+
Vin = 48V Iout = 50A Local O/P Sensing
Startup Characteristics
ch1
2mV=
ch1:
rise= 1.93ms
rise= 2.27ms
ch2
T
T
1
2
1
CH1
CH1 0.5 V=
CH2 2.00 V=
0.5 V=
MTB1.00ms- 4.34dv ch1+
MTB1.00ms- 2.32dv ch1+
Conducted EMI Characteristic with
external filter as specified
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5
QHS50-018_6201031512_D01_22/04/08
Q-ClassConverters
Murata Power Solutions
QHS50-018 Model
QHS50-018 Trim-up and Trim-down Resistance
1000
Resistance (kOhms)
Rup
Rdow n
100
10
0
2
4 Delta (%)6
8
10
Safety considerations
The QHS series of converters are certified to IEC/EN/CSA/UL 60950. If this product is built into information technology
equipment, the installation must comply with the above standard.
An external input fuse (5A to 30A recommended), must be used to meet the above requirements.
The output of the converter [Vo(+)/Vo(-)] is considered to remain within SELV limits when the input to the converter
meets SELV or TNV-2 requirements.
The converters and materials meet UL 94V-0 flammability ratings.
www.murata-ps.com/support
6
QHS50-018_6201031512_D01_22/04/08
Murata Power Solutions
Q-ClassConverters
QHS50-018 Model
Part Number Designations
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.
© 2012 Murata Power Solutions, Inc.
www.murata-ps.com/support
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QHS50-018_6201031512_D01_22/04/08