VHK50W-Q48-S15 [CUI]
chassis mount dc-dc converter; 底座安装的DC-DC转换器
| 型号： | VHK50W-Q48-S15 |
| 厂家： | 
CUI INC |
| 描述： | chassis mount dc-dc converter |
| 文件： | 总9页 (文件大小：547K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
page
1 of 9
date 04/2008
PART NUMBER: VHK50W
DESCRIPTION: chassis mount dc-dc converter
description
features
The VHK50W series of rugged DC-DC
converters are designed for high
reliability applications, featuring integral
heat sink, over-temperature protection,
over-current protection and input
transient voltage protection. With an
external input fuse, the converter can
protect accidental input polarity reversal.
The wide 4:1 input range (9-36V or 18-
75V) is very useful to stabilize an input
source like batteries in various
·25-50W isolated output
·Efficiency to 84%
·RoHS Compliant
·4:1 input range
·Regulated output
·Continuous short circuit
protection
·Metal enclosure with integrated
heatsink
·Rugged design
discharging and charging conditions.
Additionally, high efficiency, fast
response, tight regulations, remote sense
and remote On/Off control make these
converters very useful in many industrial
and communications applications.
·Over-temperature shutdown
MODEL
input voltage
output
voltage
(V dc)
output
current
(A)
input current
efficiency
1
nominal
(V dc)
range
(V dc)
no load
full load
(mA)
typ.
(%)
(mA)
50
50
50
50
50
50
50
50
50
50
VHK50W-Q24-S3R3
VHK50W-Q24-S5
VHK50W-Q24-S12
VHK50W-Q24-S15
VHK50W-Q24-S24
VHK50W-Q48-S3R3
VHK50W-Q48-S5
VHK50W-Q48-S12
VHK50W-Q48-S15
VHK50W-Q48-S24
24
24
24
24
24
48
48
48
48
48
9.0~36.0
9.0~36.0
9.0~36.0
9.0~36.0
9.0~36.0
18.0~75.0
18.0~75.0
18.0~75.0
18.0~75.0
18.0~75.0
3.3
5
10
10
1785
2570
2510
2510
2510
880
77
81
83
83
83
78
82
84
84
84
12
15
24
3.3
5
4.16
3.33
2.08
10
10
1270
1240
1240
1240
12
15
24
4.16
3.33
2.08
notes:
1. see output derating curve (page 4)
INPUT
parameter
conditions/description
min
nom
24
48
8.8
8
max
36
units
input voltage range
9
V dc
V dc
V dc
V dc
V dc
V dc
18
75
under voltage lockout
24 Vin power up
24 Vin power down
48 Vin power up
17
16
48 Vin power down
section 15 in the application notes
PI type
remote on/off control2
input filter
notes:
2. add suffix “N” to the model number for negative logic on/off control
*V-Infinity reserves the right to make changes to its products or to discontinue any product or service without notice, and to advise customers to verify the most up-to-
date product information before placing orders. V-Infinity assumes no liability or responsibility for customer’s applications using V-Infinity products other than repair
or replacing (at V-I’s option) V-Infinity products not meeting V-I’s published specifications. Nothing will be covered outside of standard product warranty.
th
20050 SW 112 Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382
page
date 04/2008
2 of 9
PART NUMBER: VHK50W
DESCRIPTION: chassis mount dc-dc converter
OUTPUT
parameter
conditions/description
25% step load change
3.3V, 5V
min
nom
max
±1
units
%
voltage accuracy
transient response
external trim adj. range
ripple & noise (20MHz BW)
500
±10
40
μ sec
%
mV RMS
mV pk-pk
mV RMS
mV pk-pk
mV RMS
mV pk-pk
%/°C
100
60
12V& 15V
150
100
240
24V
temperature coefficient
short circuit protection
line regulation3
±0.03
continuous
±0.2
±0.2
140
160
%
%
%
%
load regulation4
over voltage protection trip range, % Vo nom.
over current protection nominal output
115
110
GENERAL SPECIFICATIONS
parameter
conditions/description
min
nom
max
units
KHz
°C
switching frequency
operating ambient temp.5
storage temperature
thermal shutdown case temp.
case material
300
-40
-55
85
105
°C
85
°C
aluminum / steel
ISOLATION SPECIFICATIONS
parameter
conditions/description
min
1500
1500
1500
100
nom
max
units
V dc
V dc
V dc
MΩ
isolation voltage
input/output
input/case
output/case
isolation resistance
notes:
3. measured from high line to low line at full load
4. measured from full load to zero load at nominal input
5. see output derating curve (page 4)
*V-Infinity reserves the right to make changes to its products or to discontinue any product or service without notice, and to advise customers to verify the most up-to-
date product information before placing orders. V-Infinity assumes no liability or responsibility for customer’s applications using V-Infinity products other than repair
or replacing (at V-I’s option) V-Infinity products not meeting V-I’s published specifications. Nothing will be covered outside of standard product warranty.
th
20050 SW 112 Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382
REV.
A
DESCRIPTION
NEW DRAWING
DATE
4/22/2008
86.3 3.398
108.0 4.252
38.00 1.496
16.0 0.630
(TYP)
101.76 4.006
91.0 3.583
(2 PLCS)
6
7
8
9
9.7 0.382
(TYP)
19.0 0.748
70.0 2.756
TOLERANCE:
±0.3mm UNLESS OTHERWISE
SPECIFIED
RoHS
1
2
3
4
5
9.7 0.380
(TYP)
26.18 1.031
Terminal #
Description
20050 SW 112th Ave.
Tualatin, OR 97062
Phone: 503-612-2300
800-275-4899
- V out
- S
1
2
3
4
5
6
7
8
9
Fax: 503-612-2383
Website: www.cui.com
Trim
+ S
TITLE:
REV:
VHK
+ V out
Case
Remote
- V in
+ V in
A
PART NO.
UNITS:
VHKXXW Series
MM [INCHES]
SCALE:
PC FILE NAME:
APPROVED BY:
DRAWN BY:
VHKXXW Series
ZRJ
1:2
Material
Aluminum/Steel
COPYRIGHT 2008 BY CUI INC.
page
date 04/2008
4 of 9
PART NUMBER: VHK50W
DESCRIPTION: chassis mount dc-dc converter
APPLICATION NOTES
1. OUTPUT DE-RATING
The operating ambient temperature range for VHK50W is -40 ~ +85°C, with the actual output power subject to the following de-rating
curves at free-air convection and at forced air conditions. To ensure long-term reliability, it is important to ensure proper cooling at
the worst operating conditions.
VHK50W Power Derating Curves
115%
Natural
Convection
100%
0.5 m/S
(100LFM)
1.0 m/S
(200LFM)
80%
1.5 m/S
(300LFM)
60%
2.0 m/S
(400LFM)
40%
2.5 m/S
(500LFM)
3.0 m/S
(600LFM)
20%
3.5 m/S
(700LFM)
0%
-40
55
60
65
70
75
80
85
Ambient Temperature - degrees C
FIGURE 1. OUTPUT DERATING
2. INPUT VOLTAGE RANGE
It is important to ensure the input voltage measured at the converter input pins is within the range for that converter. Make sure wire
losses and voltage ripples are accounted for. One possible problem is driving the converter with a linear unregulated power supply.
For example, if the average voltage measured by a DMM is 9V, with a voltage ripple of 3Vpp, the actual input can swing from 7.5V to
10.5V. This will be outside the specified input range of 9-36V and the converter may not function properly. On the other end, make
sure the actual input voltage does not exceed the highest voltage of 36V or75V.
3. LEAD WIRES
Make sure the input and output wires are of adequate AWG size to minimize voltage drop, and ensure the voltage across the input
terminals is above the converter's rated minimum voltage at all times. It is recommended to have the wire pairs twisted, respectively
for the input pair and the output pair, so as to minimize noise pickup.
th
20050 SW 112 Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382
page
date 04/2008
5 of 9
PART NUMBER: VHK50W
DESCRIPTION: chassis mount dc-dc converter
4. INPUT CURRENT
The input voltage source must be able to provide enough current to the converter, otherwise it may not start up or operate properly. A
typical symptom is not starting or unusually low output voltage. In general, it is recommended to be able to provide at least:
Ipeak = 150%*Pout/(η*Vmin) where Pout is the maximum output power, Vmin is the minimum input voltage and η is the converter's
efficiency. As an example, for VHK50W-Q24-S5 to operate with 9~36V input, 50W output and an efficiency of 81%, the minimum
source current is recommended to be: Ipeak = 150% * 50 / (81% * 9) = 10.29A.
5. INPUT FUSE
To limit the input current and to facilitate input reversal protection and input OVP protection, a fast-acting input fuse is recommended
for the input line. The fuse rating will depend on the input range and should allow for the maximum current at the lowest input volt-
age, as shown in this equation: Ipeak = 150%*Pout/(η*Vmin).
In the previous example of VHK50W-Q24-S5, the peak input current at 9V was calculated to be 10.29A. A 10A or a 15A fuse may be
suitable for this application. Make sure the fuse voltage rating is higher than the maximum input voltage.
6. INPUT OVP
It is important to ensure the input voltage does not exceed the maximum rated input voltage for that model. To suppress voltage tran-
sients of short durations, the converter includes a transient voltage suppression device (TVS) at the input. The built-in TVS has a
rated breakdown voltage of 39V for the VHK50W-Q24-XX models and 82V for the VHK50W-Q48 models. With small transients of
short-durations, the TVS will limit the input voltage without interrupting the converters operations. For large transients, the TVS may
conduct a large amount of current that may trip the input fuse. Without the input fuse, the converter may suffer permanent damages.
When the fuse is open, replace it with one of same type and ratings.
7. INPUT REVERSAL PROTECTION
If the input voltage is reversed for any reason, the built-in protection circuits in the converter will limit the reverse voltage to one diode
drop which is no more than 1V. With an external input fuse connected, the fuse will open and thus remove power from the converter.
Check the wiring and make corrections as needed. The input fuse will need to be replaced. Make sure the new fuse is of the same
type and rating. Without the input fuse, the converter may suffer permanent damages.
8. REMOTE SENSE
The converter provides regulated outputs at the output terminals. When there is a large current and/or the output cable is of some
length, the voltage at the end of the output cable may be noticeably lower than at the terminals. The converter can compensate up to
0.5V of voltage drop through remote sense terminals. To ensure accurate regulation, run two separate wires (twisted) from the
desired regulation points to the remote sense terminals, as shown below.
+Vo
+S
Trim
-S
(+)
(-)
Load
-Vo
FIGURE 2. REMOTE SENSE
th
20050 SW 112 Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382
page
date 04/2008
6 of 9
PART NUMBER: VHK50W
DESCRIPTION: chassis mount dc-dc converter
9. OUTPUT TRIMMING (OPTIONAL)
The output voltages are preset to nominal values as indicated by the models table at the factory. If desired, the output voltage may
optionally be trimmed to a different value (+/- 10%) with external resistors and/or potentiometer as shown below.
+Vo
+Vin
+S
FIGURE 3. TRIMMING WITH
10KΩ
Trimpot
Trim
R load
EXTERNAL POTENTIOMETER
-S
-Vin
-Vo
To trim the output voltage with fixed resistors, the output voltage can be calculated as follows.
Trim-Up
Trim-Down
+Vo
+S
+Vo
+S
+Vin
+Vin
R trim-down
Trim
-S
Trim
-S
R load
R load
R trim-up
-Vin
-Vin
-Vo
-Vo
FIGURE 4: TRIM-UP VOLTAGE SETUP
FIGURE 5: TRIM-DOWN VOLTAGE SETUP
The value of Rtrim-up is defined as:
The value of Rtrim-down is defined as:
Where: Rtrim-up is the external resistor in KΩ. Vo,nom is the
nominal output voltage. Vo is the desired output voltage. R1,
R2, R3, Vr, and Vf are internal to the unit and are defined in
Table 1. For example, to trim-up the output voltage of 5.0V
module (VHK50W-Q48-S5) by 8% to 5.4V, Rtrim-up is calculated
as follows:
Where: Rtrim-down is the external resistor in KΩ. Vo,nom is the
nominal output voltage. Vo is the desired output voltage. R1,
R2, and Vr are internal to the unit and are defined in
Table 1. For example, to trim-up the output voltage of 5.0V
module (VHK50W-Q48-S5) by 8% to 4.6V, Rtrim-down is calculated
as follows:
Ω
Ω
Ω
Table 1
th
20050 SW 112 Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382
page
date 04/2008
7 of 9
PART NUMBER: VHK50W
DESCRIPTION: chassis mount dc-dc converter
10. OUTPUT OCP AND SHORT-CIRCUIT PROTECTION
Output overload and short circuit conditional will cause the output voltage to decline or shutdown altogether. If the case temperature
is not over 85°C, the output recovers automatically when the short or OCP conditions are removed. In the case of slight overloading,
the output voltage may not shut down, but the converter may build up heat over time, causing over-temperature shutdown.
11. OVER-TEMPERATURE PROTECTION
When the case temperature reaches about 85°C, the converter's built-in protection circuit will shut down the output. When the tem-
perature is reduced enough to a safe operating level, the converter will recover to normal operations automatically.
12. OUTPUT OVP
In case the output voltage exceeds the OVP threshold, the converter shuts down.
13. OUTPUT PARALLEL CONNECTIONS
The converter is not designed for load share on the output. However, for redundancy, the outputs of two or more converters can be
connected in parallel through O-Ring diodes, as shown below.
+Vo
+Vin
-Vin
-Vo
FIGURE 6. OUTPUT
PARALLEL CONNECTIONS
+Vo
+Vin
-Vin
-Vo
14. OUTPUT SERIES CONNECTIONS
Two or more converters can be connected in series to obtain a higher output voltage. To prevent output reverse biasing each other in
case of a short, add a Schottky diode on each output in reverse polarity, as shown in the diagram. In the event of a short, the con-
verters will forward-bias the diodes and the output reversal will be limited to one diode drop (about 0.5V) only, so as not to damage
the converters. The forward current will cause each converter to go into short-circuit protection. For proper diode selection, make
sure that: 1) the diodes voltage rating is higher than each converter output; 2) the rated diode current can carry the short-circuit cur-
rent; 3) the diodes do not overheat before the short is removed.
+Vo
+Vin
-Vin
-Vo
FIGURE 7. OUTPUT
SERIES CONNECTIONS
+Vo
+Vin
-Vin
-Vo
th
20050 SW 112 Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382
page
date 04/2008
8 of 9
PART NUMBER: VHK50W
DESCRIPTION: chassis mount dc-dc converter
15. REMOTE OUTPUT ON/OFF CONTROL
The converter output can be enabled or disabled through the On/Off pin. The control logic is shown in this table. A common control
circuit is shown below.
+Vo
REM (pin 2)
REM
SW
SW
High signal here
disable output
-Vin
-Vin (pin 4)
-Vo
FIGURE 8. REMOTE ON/OFF CONTROL
FIGURE 9. REMOTE ON/OFF CONTROL
WITH TRANSISTOR SWITCH
Logic Table
SW Closed (V
SW Open (VREM >2.4 V)
Negative logic
Output on
Output off
Positive logic
Output off
Output on
REM
<0.8 V)
16. ISOLATION
The input and output of the converter are electrically isolated. If needed, an output terminal can be connected to an input terminal,
resulting in the converter non-isolated.
17. INPUT FILTERING AND EMI INTERFERENCE
The VHK50W converters have input capacitors that control input current ripple and the associated EMI interference. However, it
has not been tested to a formal standard for conducted emissions. Additional filtering may be needed to ensure compliance to an
EMI standard. Refer to FIGURE 10 for a reference circuit.
L1
L2
+Vin
-Vin
+Vo
-Vo
C1
C2
C3
CASE
FIGURE 10. EMI FILTER FOR VHK50W
C4
VHK50W Series
C1
NC
C2
C3
47µF/50V
ESR<0.60
C4
L1
Short
L2
2.5µH
47µF/50V
2200pF/2KV
EMI to meet class A
ESR<0.60
NC
220µF/50V
ESR<0.120
220µF/50V
ESR<0.120
2200pF/2KV
Short
1.5µH
EMI to meet class B
NOTE: The recommended components are a starting point but not guaranteed for meeting these EMI
requirements. More or less filtering may be required for a specific application or to meet other EMI standards,
e.g. MIL-STD-461.
th
20050 SW 112 Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382
page
date 04/2008
9 of 9
PART NUMBER: VHK50W
DESCRIPTION: chassis mount dc-dc converter
18. OUTPUT FILTERING
The converter has built-in capacitors at the output to control ripple and noise. If desired, additional output capacitance can be
introduced at the input to the powered equipment. Recommended starting point: one 10μF tantalum and one 1μF ceramic capacitor in
parallel at the output.
19. OUTPUT NOISE MEASUREMENT SCHEMATIC
For proper output ripple and noise measurement, connect a 10μF tantalum and a 1μF ceramic capacitor across the output. Set the
scope bandwidth to 20MHz. Probe directly off of one of the capacitors, using a small ground clip to minimize measurement error.
Ceramic
1.0µF
+Vo
+Vin
+S
+
Resistor
Load
Trim
-S
-Vin
-Vo
Solid Tantalum
10µF
To Scope
FIGURE 11. OUTPUT NOISE MEASUREMENT CIRCUIT
th
20050 SW 112 Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382
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