PART NUMBER: VHK75W DESCRIPTION: chassis mount dc-dc converter

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PART NUMBER: VHK75W DESCRIPTION: chassis mount dc-dc converter

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04/2008
PART NUMBER: VHK75W
DESCRIPTION: chassis mount dc-dc converter
description
VHK75W series rugged DC-DC converters designed high reliability applications, featuring integral heat sink, over-temperature protection, over-current protection input transient voltage protection. With external input fuse, converter protect accidental input polarity reversal. wide input range (9-36V 1875V) very useful stabilize input source like batteries various discharging charging conditions. Additionally, high efficiency, fast response, tight regulations, remote sense remote On/Off control make these converters very useful many industrial communications applications.
features
isolated output Compliant input range output short circuit protection enclosure with integrated heatsink design shutdown
MODEL
VHK75W-Q24-S3R3 VHK75W-Q24-S5 VHK75W-Q24-S12 VHK75W-Q24-S15 VHK75W-Q24-S24 VHK75W-Q48-S3R3 VHK75W-Q48-S5 VHK75W-Q48-S12 VHK75W-Q48-S15 VHK75W-Q48-S24
notes:
input voltage nominal range
output voltage
output current
input current load full load (mA) (mA)
efficiency typ.
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
6.25 3.12 6.25 3.12
2611 3811 3765 3720 3720 1289 1883 1860 1838 1835
output derating curve (page
INPUT
parameter input voltage range under voltage lockout conditions/description units
remote on/off control input filter
notes:
power power down power power down section application notes type
suffix model number negative logic on/off control
*V-Infinity reserves right make changes products discontinue product service without notice, advise customers verify most up-todate product information before placing orders. V-Infinity assumes liability responsibility customer's applications using V-Infinity products other than repair replacing V-I's option) V-Infinity products meeting V-I's published specifications. Nothing will covered outside standard product warranty.
20050 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 503.612.2382
page date
04/2008
PART NUMBER: VHK75W
DESCRIPTION: chassis mount dc-dc converter
OUTPUT
parameter voltage accuracy transient response external trim adj. range ripple noise (20MHz conditions/description step load change 3.3V, 12V& temperature coefficient short circuit protection continuous line regulation load regulation over voltage protection trip range, nom. over current protection nominal output ±0.03 ±0.2 ±0.2 units pk-pk pk-pk pk-pk %/°C
GENERAL SPECIFICATIONS
parameter switching frequency operating ambient temp. storage temperature thermal shutdown case temp. case material conditions/description aluminum steel units
ISOLATION SPECIFICATIONS
parameter isolation voltage conditions/description input/output input/case output/case 1500 1500 1500 units
isolation resistance
notes: measured from high line line full load measured from full load zero load nominal input output derating curve (page
*V-Infinity reserves right make changes products discontinue product service without notice, advise customers verify most up-todate product information before placing orders. V-Infinity assumes liability responsibility customer's applications using V-Infinity products other than repair replacing V-I's option) V-Infinity products meeting V-I's published specifications. Nothing will covered outside standard product warranty.
20050 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 503.612.2382
REV.
DESCRIPTION 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 PLCS) 0.382 (TYP) 19.0 0.748
70.0 2.756
TOLERANCE: ±0.3mm UNLESS OTHERWISE SPECIFIED 26.18 1.031 0.380 (TYP) Terminal Description Trim Case Remote 20050 112th Ave. Tualatin, 97062 Phone: 503-612-2300 800-275-4899 Fax: 503-612-2383 Website: www.cui.com
TITLE:
RoHS
VHKXXW Series
APPROVED UNITS:
REV:
PART
[INCHES]
SCALE:
FILE NAME:
DRAWN
VHKXXW Series
COPYRIGHT 2008 INC.
Material
Aluminum/Steel
page date
04/2008
PART NUMBER: VHK75W
DESCRIPTION: chassis mount dc-dc converter
APPLICATION NOTES
OUTPUT DE-RATING operating ambient temperature range VHK75W +85°C, with actual output power subject following de-rating curves free-air convection forced conditions. ensure long-term reliability, important ensure proper cooling worst operating conditions.
VHK75W Power Derating Curves
120%
Natural Convection
100%
(100LFM)
Relative Output Power nominal output
(200LFM)
(300LFM)
(400LFM)
(500LFM)
(600LFM)
(700LFM)
Ambient Temperature degrees
FIGURE OUTPUT DERATING INPUT VOLTAGE RANGE important ensure input voltage measured converter input pins within range that converter. Make sure wire losses voltage ripples accounted for. possible problem driving converter with linear unregulated power supply. example, average voltage measured with voltage ripple 3Vpp, actual input swing from 7.5V 10.5V. This will outside specified input range 9-36V converter function properly. other end, make sure actual input voltage does exceed highest voltage or75V.
LEAD WIRES Make sure input output wires adequate size minimize voltage drop, ensure voltage across input terminals above converter's rated minimum voltage times. recommended have wire pairs twisted, respectively input pair output pair, minimize noise pickup.
20050 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 503.612.2382
page date
04/2008
PART NUMBER: VHK75W
DESCRIPTION: chassis mount dc-dc converter
INPUT CURRENT input voltage source must able provide enough current converter, otherwise start operate properly. typical symptom starting unusually output voltage. general, recommended able provide least: Ipeak 150%*Pout/( *Vmin) where Pout maximum output power, Vmin minimum input voltage converter's efficiency. example, VHK75W-Q24-S5 operate with 9~36V input, output efficiency 82%, minimum source current recommended Ipeak 150% (82% 15.24A.
INPUT FUSE limit input current facilitate input reversal protection input protection, fast-acting input fuse recommended input line. fuse rating will depend input range should allow maximum current lowest input volt age, shown this equation: Ipeak 150%*Pout/( *Vmin). previous example VHK75W-Q24-S5, peak input current calculated 15.24A. fuse suitable this application. Make sure fuse voltage rating higher than maximum input voltage.
INPUT important ensure input voltage does exceed maximum rated input voltage that model. suppress voltage transients short durations, converter includes transient voltage suppression device (TVS) input. built-in rated breakdown voltage VHK75W-Q24-XX models VHK75W-Q48 models. With small transients short-durations, will limit input voltage without interrupting converters operations. large transients, conduct large amount current that trip input fuse. Without input fuse, converter suffer permanent damages. When fuse open, replace with same type ratings.
INPUT REVERSAL PROTECTION input voltage reversed reason, built-in protection circuits converter will limit reverse voltage diode drop which more than With external input fuse connected, fuse will open thus remove power from converter. Check wiring make corrections needed. input fuse will need replaced. Make sure fuse same type rating. Without input fuse, converter suffer permanent damages.
REMOTE SENSE converter provides regulated outputs output terminals. When there large current and/or output cable some length, voltage output cable noticeably lower than terminals. converter compensate 0.5V voltage drop through remote sense terminals. ensure accurate regulation, separate wires (twisted) from desired regulation points remote sense terminals, shown below.
Trim
FIGURE REMOTE SENSE
Load
20050 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 503.612.2382
page date
04/2008
PART NUMBER: VHK75W
DESCRIPTION: chassis mount dc-dc converter
OUTPUT TRIMMING (OPTIONAL) output voltages preset nominal values indicated models table factory. desired, output voltage optionally trimmed different value (+/- 10%) with external resistors and/or potentiometer shown below.
+Vin
FIGURE TRIMMING WITH EXTERNAL POTENTIOMETER
Trim
Trimpot load
-Vin
trim output voltage with fixed resistors, output voltage calculated follows.
Trim-Up
+Vin Trim
trim-up load
Trim-Down
+Vin
trim-down
Trim -Vin
load
-Vin
FIGURE TRIM-UP VOLTAGE SETUP value trim-up defined
FIGURE TRIM-DOWN VOLTAGE SETUP value trim-down defined
Rtrim
Vo,nom)) Vo,nom)
Rtrim down
(Vo,nom Vo)) (Vo,nom
Where: trim-up external resistor o,nom nominal output voltage. desired output voltage. internal unit defined Table example, trim-up output voltage 5.0V module (VHK75W-Q48-S5) 5.4V, trim-up calculated follows:
Where: trim-down external resistor o,nom nominal output voltage. desired output voltage. internal unit defined Table example, trim-down output voltage 5.0V module (VHK75W-Q48-S5) 4.6V, trim-down calculated follows:
Vo,nom 0.4V
Vo,nom 10.52
trim
3.168 19.656 25.474 42.33 13.304 14.76 16.67
Rtrim down
3.98
Output Voltage(V) 3.3V
Table
Table
20050 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 503.612.2382
page date
04/2008
PART NUMBER: VHK75W
DESCRIPTION: chassis mount dc-dc converter
OUTPUT SHORT-CIRCUIT PROTECTION Output overload short circuit conditional will cause output voltage decline shutdown altogether. case temperature
over 85°C, output recovers automatically when short conditions removed. case slight overloading, output voltage shut down, converter build heat over time, causing over-temperature shutdown.
OVER-TEMPERATURE PROTECTION When case temperature reaches about 85°C, converter's built-in protection circuit will shut down output. When temperature reduced enough safe operating level, converter will recover normal operations automatically.
OUTPUT case output voltage exceeds threshold, converter shuts down.
OUTPUT PARALLEL CONNECTIONS converter designed load share output. However, redundancy, outputs more converters connected parallel through O-Ring diodes, shown below.
+Vin
-Vin
FIGURE OUTPUT PARALLEL CONNECTIONS
+Vin
-Vin
OUTPUT SERIES CONNECTIONS more converters connected series obtain higher output voltage. prevent output reverse biasing each other case short, Schottky diode each output reverse polarity, shown diagram. event short, converters will forward-bias diodes output reversal will limited diode drop (about 0.5V) only, damage converters. forward current will cause each converter into short-circuit protection. proper diode selection, make
sure that: diodes voltage rating higher than each converter output; rated diode current carry short-circuit current; diodes overheat before short removed.
+Vin
-Vin
FIGURE OUTPUT SERIES CONNECTIONS
+Vin
-Vin
20050 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 503.612.2382
page date
04/2008
PART NUMBER: VHK75W
DESCRIPTION: chassis mount dc-dc converter
REMOTE OUTPUT ON/OFF CONTROL converter output enabled disabled through On/Off pin. control logic shown this table. common control circuit shown below.
(pin
High signal here disable output
-Vin
-Vin (pin
FIGURE REMOTE ON/OFF CONTROL WITH TRANSISTOR SWITCH
FIGURE REMOTE ON/OFF CONTROL
Logic Table Negative logic Closed <0.8 Output Open >2.4 Output
ISOLATION
Positive logic Output Output
input output converter electrically isolated. needed, output terminal connected input terminal, resulting converter non-isolated.
INPUT FILTERING INTERFERENCE VHK75W converters have input capacitors that control input current ripple associated interference. However, been tested formal standard conducted emissions. Additional filtering needed ensure compliance standard. Refer FIGURE reference circuit.
FIGURE FILTER VHK75W
+Vin
-Vin
CASE
VHK75W Series meet class meet class 100µF/50V ESR<0.330 100µF/50V ESR<0.330 100µF/50V ESR<0.330 1000pF/2KV 2200pF/2KV 0.65mH 1.5µH 1.3mH 1.5µH
100µF/50V 100µF/50V ESR<0.330 ESR<0.330
NOTE: recommended components starting point guaranteed meeting these requirements. More less filtering required specific application meet other standards,
e.g. MIL-STD-461.
20050 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 503.612.2382
page date
04/2008
PART NUMBER: VHK75W
DESCRIPTION: chassis mount dc-dc converter
OUTPUT FILTERING converter built-in capacitors output control ripple noise. desired, additional output capacitance introduced input powered equipment. Recommended starting point: tantalum ceramic capacitor parallel output.
OUTPUT NOISE MEASUREMENT SCHEMATIC proper output ripple noise measurement, connect tantalum ceramic capacitor across output. scope bandwidth 20MHz. Probe directly capacitors, using small ground clip minimize measurement error.
+Vin
Trim
Ceramic 1.0µF
Resistor Load
-Vin
Solid Tantalum 10µF Scope
FIGURE OUTPUT NOISE MEASUREMENT CIRCUIT
20050 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 503.612.2382

PART NUMBER: VHK75W DESCRIPTION: chassis mount dc-dc converter

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