06/2009 PART NUMBER: VHB50W DESCRIPTION: half-brick dc-dc co

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06/2009 PART NUMBER: VHB50W DESCRIPTION: half-brick dc-dc co

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06/2009
PART NUMBER: VHB50W
DESCRIPTION: half-brick dc-dc converter
description
VHB50W series DC-DC converters designed high reliability applications, featuring over-temperature protection, over-current protection. wide input range (9-36V 18-75V) 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 applications.
features
isolated output switching frequency output short circuit protection standard half-brick size on/off protection protection
MODEL
VHB50W-Q24-S3R3 VHB50W-Q24-S5 VHB50W-Q24-S12 VHB50W-Q24-S15 VHB50W-Q24-S24 VHB50W-Q24-S28 VHB50W-Q24-S48 VHB50W-Q48-S3R3 VHB50W-Q48-S5 VHB50W-Q48-S12 VHB50W-Q48-S15 VHB50W-Q48-S24 VHB50W-Q48-S28 VHB50W-Q48-S48
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 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 18.0~75.0 18.0~75.0
4.16 3.33 2.08 1.78 1.04 4.16 3.33 2.08 1.78 1.04
1785 2637 2537 2538 2537 2537 2537 1302 1267 1265 1264 1264 1253
output derating (page input currents measured nominal input voltage efficiency measured nominal line, full load
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
06/2009
PART NUMBER: VHB50W
DESCRIPTION: half-brick 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 current ±0.03 ±0.2 ±0.2 <500 units %/°C
GENERAL SPECIFICATIONS
parameter switching frequency operating ambient temp. storage temperature thermal shutdown case temp. case material conditions/description aluminum 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
page date
06/2009
PART NUMBER: VHB50W
DESCRIPTION: half-brick dc-dc converter
MECHANICAL DRAWING
20050 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 503.612.2382
page date
06/2009
PART NUMBER: VHB50W
DESCRIPTION: half-brick dc-dc converter
APPLICATION NOTES
OUTPUT DE-RATING operating case temperature range VHB50W +100°C. When operating VHB50W series, proper derating cooling needed. maximum case temperature under operating condition should exceed 100°C.
Power Dissipated Ambient Temperature
Natural Convection ft./min. (0.1 m/s) ft./min. (0.5 m/s)
Power Disspated ,Pd(Watts)
ft./min. (1.0 m/s) ft./min. (1.5 m/s) ft./min. (2.0 m/s) ft./min. (2.5 m/s) ft./min. (3.0 m/s) ft./min. (3.5 m/s) ft./min. (4.0 m/s)
Ambient Temperature ,Ta(Deg.
FIGURE OUTPUT DERATING (FORCED CONVECTION WITH HEAT SINK)
Example: What minimum airflow necessary VHB50W-Q48-S12 operating nominal line, output current 4.16 maximum ambient temperature 60°C? Solution: Given: Vin=48 Vo=12 Io=4.16 Determine Power dissipation (Pd): Pd=Pi-Po=Po(1-)/ Determine airflow: Given: Pd=9.51 Ta=60°C Check above Power de-rating curve: minimum airflow= ft./min. Verifying:
FLOW RATE Natural Convection 20ft./min. (0.1m/s) ft./min. (0.5m/s) ft./min. (1.0m/s) ft./min. (1.5m/s) ft./min. (2.0m/s) ft./min. (2.5m/s) ft./min. (3.0m/s) ft./min. (3.5m/s) ft./min. (4.0m/s)
TYPICAL 7.12 6.21 5.17 4.29 3.64 2.96 2.53 2.37 2.19
Chart Thermal Resistance Flow
maximum temp. rise maximum case temperature Tc=Ta+T=94.6°C<100°C Where: thermal resistance from case ambience.The ambient temperature case temperature.
20050 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 503.612.2382
page date
06/2009
PART NUMBER: VHB50W
DESCRIPTION: half-brick dc-dc converter
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 75V.
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.
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, VHB50W-Q24-S5 operate with 9~36 input, output efficiency 81%, minimum source current recommended Ipeak 150% (81% 10.29
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 VHB50W-Q24-S5, peak input current calculated 10.29 fuse suitable this application. Make sure fuse voltage rating higher than maximum input voltage.
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
06/2009
PART NUMBER: VHB50W
DESCRIPTION: half-brick 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-up
nom)
Rtrim-down
(Vo,
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 (VHB50W-Q48-S5) 5.4V, trim-up calculated follows:
Where: trim-down external resistor o,nom nominal output voltage. desired output voltage. andR internal unit defined Table example, trim-up output voltage 5.0V module (VHB50W-Q48-S5) 4.6V, trim-down calculated follows:
11.2
3.168 18.945 25.189 25.189 608.6 74.25
5.32
Rtrim-up
3.3V
Rtrim-down
Table
4.636 7.191 6.977 173.7 13.3
Table
5.32 9.18 3.3V 6.18 5.32 60.1 86.45 173.7 608.6 1638
20050 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 503.612.2382
page date
06/2009
PART NUMBER: VHB50W
DESCRIPTION: half-brick dc-dc converter
OUTPUT SHORT-CIRCUIT PROTECTION Output overload short circuit conditional will cause output voltage decline shutdown altogether. case temperature
over 100°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 100°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. inclined this circuit force current sharing trimming output voltages each converter. However, this circuit reliably accurately divide load current, device characteristics converters diodes balanced over range operating conditions. generally recommend this circuit increase power output over single converter. Instead, recommend this setup redundancy only, having converter backup case failure. Make sure OR-ing diodes handle voltage full load current.
+Vin
-Vin
FIGURE OUTPUT PARALLEL CONNECTIONS
+Vin
-Vin
20050 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 503.612.2382
page date
06/2009
PART NUMBER: VHB50W
DESCRIPTION: half-brick dc-dc converter
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
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.
20050 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 503.612.2382
page date
06/2009
PART NUMBER: VHB50W
DESCRIPTION: half-brick dc-dc converter
INPUT FILTERING INTERFERENCE VHB50W 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 10.1 10.2 reference circuits.
FIGURE 10.1. FILTER VHB50W,
+Vin
-Vin
CASE
VHB50W Series 47F/50V meet class ESR<0.60 220F/50V meet class ESR<0.120 47F/50V ESR<0.60 220F/50V ESR<0.120 2200pF/2KV 2200pF/2KV 2.5H 1.5H
FIGURE 10.2A. FILTER VHB50W, (CLASS
+Vin
-Vin
CASE
Model VHB50W-Q24-S28 VHB50W-Q48-S28 100uF/50V 100uF/100V 100uF/50V 100uF/100V 2200pF/2KV 2200pF/2KV 3.4uH 3.4uH
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
06/2009
PART NUMBER: VHB50W
DESCRIPTION: half-brick dc-dc converter
FIGURE 10.2B. FILTER VHB50W, (CLASS
+Vin
DC/DC Converter CASE
-Vin
Note:
Model 100uF/50V VHB50W-Q24-S28 100uF/50V
0.12mH 0.12mH 0.34mH 0.34mH
1000pF/2KV
VHB50W-Q48-S28 100uF/100V 100uF/100V 1000pF/2KV
FIGURE 10.3. FILTER VHB50W,
FUSE
+Vin
-Vin
CASE
meet class
Short
3.5uH
VHB50W-Q24-S48 VHB50W-Q48-S48
meet class
100uF/50V 100uF/50V ESR<0.33 ESR<0.33 47uF/100V 47uF/100V 2200pF/2KV
Short 3.5uH
VHB50W-Q24-S48 VHB50W-Q48-S48
10uF/50V 100uF/50V 100uF/50V 4700pF/2KV 2200pF/2KV 1000pF/2KV 1.5mH 3.4uH X7R,2220 Ceramic ESR<0.33 ESR<0.33 47uF/100V 47uF/100V 47uF/100V 4700pF/2KV 2200pF/2KV 1000pF/2KV 1.5mH 3.4uH
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
06/2009
PART NUMBER: VHB50W
DESCRIPTION: half-brick 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 1.0F
Resistor Load
-Vin
Solid Tantalum Scope
FIGURE OUTPUT NOISE MEASUREMENT CIRCUIT
20050 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 503.612.2382

06/2009 PART NUMBER: VHB50W DESCRIPTION: half-brick dc-dc co

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