VHK50W-Q24-S28_技术文档

rev.

page

1 of 11

date 08/2009

date

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 83%

·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

input current

2

efficiency

1

2

3

nominal

(V dc)

range

(V dc)

current

(A)

no load

full load

(mA)

typ.

(mA)

50

(%)

75

79

82

76

80

83

VHK50W-Q24-S3R3

VHK50W-Q24-S5

VHK50W-Q24-S12

VHK50W-Q24-S15

VHK50W-Q24-S24

VHK50W-Q24-S28

VHK50W-Q24-S48

VHK50W-Q48-S3R3

VHK50W-Q48-S5

VHK50W-Q48-S12

VHK50W-Q48-S15

VHK50W-Q48-S24

VHK50W-Q48-S28

VHK50W-Q48-S48

24

48

9.0~36.0

18.0~75.0

3.3

5

10

1833

2637

2537

2538

2537

905

1302

1267

1265

1264

1253

12

15

24

28

48

3.3

5

12

15

24

28

48

4.16

3.33

2.08

1.78

1.04

10

4.16

3.33

2.08

1.78

1.04

notes:

1. see output derating curves (page 4)

2. input currents are measured at nominal input voltage

3. efficiency is measured at nominal line, full load

INPUT

parameter

conditions/description

min

9

18

nom

24

48

8.8

8

max

36

75

units

V dc

input voltage range

under voltage lockout

24 Vin power up

24 Vin power down

48 Vin power up

48 Vin power down

section 15 in the application notes

PI type

17

16

remote on/off control⁴

input filter

notes:

4. 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 503.612.2383 www.v-infinity.com

page

date 08/2009

2 of 11

PART NUMBER: VHK50W

DESCRIPTION: chassis mount dc-dc converter

OUTPUT

parameter

conditions/description

min

nom

max

1

500

10

40

100

60

150

100

240

100

280

200

480

units

%

μ sec

voltage accuracy

transient response

external trim adj. range

ripple & noise (20MHz BW)

25% step load change

%

3.3V, 5V

12V& 15V

24V

mV RMS

mV p-p

mV RMS

mV p-p

mV RMS

mV p-p

mV RMS

mV p-p

mV RMS

mV p-p

%/°C

28V

48V

temperature coefficient

short circuit protection

line regulation⁵

load regulation⁶

over voltage protection trip range, % Vo nom.

0.03

continuous

0.2

1

140

160

%

115

110

over current protection

% nominal output current

GENERAL SPECIFICATIONS

parameter

conditions/description

min

nom

300

max

units

KHz

°C

switching frequency

operating ambient temp.⁷

storage temperature

thermal shutdown case temp.

case material

derated from 60 to 85°C

aluminum / steel

-40

-55

85

105

85

ISOLATION SPECIFICATIONS

parameter

conditions/description

min

1500

100

nom

max

units

V dc

MΩ

isolation voltage

input/output

input/case

output/case

isolation resistance

notes:

5. measured from high line to low line at full load

6. measured from full load to zero load at nominal input

7. see output derating curves (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 503.612.2383 www.v-infinity.com

page

date 08/2009

4 of 11

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. Please note the derating curves may improve if the converter is mounted on a metal surface to allow

heat conduction.

VHK50W Power Derating Curves @ Nominal Input

120%

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%

20%

0%

2.5 m/S

(500LFM)

3.0 m/S

(600LFM)

3.5 m/S

(700LFM)

-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 503.612.2383 www.v-infinity.com

page

date 08/2009

5 of 11

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

voltage, 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

transients 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 in a reversal situation.

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. Even if the load current is low, still connect +Vo to +S and

-Vo to -S.

+Vo

+S

Trim

-S

(+)

(-)

Load

FIGURE 2. REMOTE SENSE

-Vo

th

20050 SW 112 Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2383 www.v-infinity.com

page

date 08/2009

6 of 11

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

+Vin

-Vin

+Vo

+Vin

-Vin

+Vo

Trim

-Vo

R trim-down

Trim

-Vo

R load

R trim-up

FIGURE 4: TRIM-UP VOLTAGE SETUP

FIGURE 5: TRIM-DOWN VOLTAGE SETUP

The value of R_trim-upis defined as:

The value of R_trim-downis defined as:

o

o, nom

)

R1 - R2 x (V - V

o, nom

R1 - R2 x (V

o

- V )

(KΩ)

R^trim-up=

R^trim-down=

o

o, nom

V - V

o, nom

V

o

- V

Where: R_trim-upis the external resistor in KΩ. V_o,nomis the

nominal output voltage. V_ois the desired output voltage. R₁,

R₂, R₃, V_r, and V_fare 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, R_trim-upis calculated

Where: R_trim-downis the external resistor in KΩ. V_o,nomis the

nominal output voltage. V_ois the desired output voltage. R₁,

R₂, and V_rare 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, R_trim-downis calculated

as follows:

Vo - Vo, nom = 5.4 - 5.0 = 0.4 V

as follows:

Vo, nom - Vo= 5.0 - 4.6 = 0.4 V

R1 = 5.8 KΩ

R2 = 5.32 KΩ

R1 = 5.8 KΩ

R2 = 3.3 KΩ

5.8 - 3.3 x 0.4

5.8 - 5.32 x 0.4

= 11.2 (KΩ)

= 9.18 (KΩ)

R^trim-up=

R^trim-down=

0.4

Ω

3.3V

5V

3.168

5.8

7.2

3.3

3.3V

5V

6.18

15

5.8

86.45

150

5.32

60.1

68

12V

15V

18.945

25.189

4.636

7.191

12V

15V

Table 1

Table 2

24V

28V

48V

25.189

608.6

74.25

6.977

173.7

13.3

24V

28V

48V

430

120

173.7

306

608.6

1638

th

20050 SW 112 Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2383 www.v-infinity.com

page

date 08/2009

7 of 11

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

temperature 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. One may be inclined to use this circuit to force current sharing by

trimming the output voltages for each converter. However, this circuit me not reliably or accurately divide the load current, as the

device characteristics of the converters or the diodes may not be balanced over a range of operating conditions. We generally do not

recommend this circuit to increase power output over a single converter. Instead, we recommend this setup for redundancy only,

having one converter as a backup in case of a failure. Make sure the OR-ing diodes can handle the voltage and full load current.

+Vo

+Vin

-Vin

-Vo

FIGURE 6. OUTPUT

PARALLEL CONNECTIONS

+Vo

+Vin

-Vin

-Vo

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page

date 08/2009

8 of 11

PART NUMBER: VHK50W

DESCRIPTION: chassis mount dc-dc converter

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

converters 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

current; 3) the diodes do not overheat before the short is removed.

+Vo

+Vin

-Vin

-Vo

FIGURE 7. OUTPUT

SERIES CONNECTIONS

+Vo

+Vin

-Vin

-Vo

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. The standard version defaults to positive logic. For negative logic, indicate the selection when ordering.

+Vo

REM (pin 2)

REM

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 (V^REM>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.

th

20050 SW 112 Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2383 www.v-infinity.com

page

date 08/2009

9 of 11

PART NUMBER: VHK50W

DESCRIPTION: chassis mount dc-dc converter

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 10.1 and 10.2 for reference circuits.

FIGURE 10.1. EMI FILTER FOR VHK50W, 3.3 ~ 24 V

L1

+Vin

-Vin

+Vo

-Vo

C1

C2

CASE

C3

VHK50W Series

C2

C3

C4

L1

47μF/50V

ESR<0.60

220μF/50V

47μF/50V 2200pF/2KV

ESR<0.60

2.5μH

EMI to meet class A

220μF/50V

2200pF/2KV 1.5μH

EMI to meet class B

ESR<0.120 ESR<0.120

FIGURE 10.2A. EMI FILTER FOR VHK50W, 28 V (CLASS A)

L1

+Vin

-Vin

+Vo

-Vo

C1

C2

CASE

C3

Model No.

C1

C2

100uF/50V KY

C3

2200pF/2KV

L1

VHK50W-Q24-S28

VHK50W-Q48-S28

100uF/50V KY

3.4uH

100uF/100V KY 100uF/100V KY 2200pF/2KV

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 503.612.2383 www.v-infinity.com

page

date 08/2009

10 of 11

PART NUMBER: VHK50W

DESCRIPTION: chassis mount dc-dc converter

FIGURE 10.2B. EMI FILTER FOR VHK50W, 28 V (CLASS B)

L1

L2

+Vin

+Vo

-Vo

DC/DC Converter

C1

C2

C3

-Vin

CASE

C4

C6

C5

C7

Note:

Model No.

C1

C2

C3 C4

C5

C6

C7

NC

L1

L2

VHK50W-Q24-S28 100uF/50V KY 100uF/50V KY NC NC 1000pF/2KV NC

VHK50W-Q48-S28 100uF/100V KY 100uF/100V KY NC NC 1000pF/2KV NC

0.12mH

0.34mH

FIGURE 10.3. EMI FILTER FOR VHK50W, 48 V

L1

L2

FUSE

TVS

+Vin

-Vin

+Vo

C2

C3

C6

C1

-Vo

CASE

C4

C5

EMI to meet class A

C1

C2

C3

C4

C5

C6

L1

L2

100uF/50V 100uF/50V

ESR<0.33Ω ESR<0.33Ω

VHK50W-Q24-S48

NC

Short 3.5uH

47uF/100V 47uF/100V

VHK50W-Q48-S48

NC

2200pF/2KV

NC

Short 3.5uH

KMF

EMI to meet class B

C1

C2

C3

C4

C5

C6

L1

L2

10uF/50V

VHK50W-Q24-S48 X7R,2220

Ceramic

100uF/50V 100uF/50V

4700pF/2KV 2200pF/2KV 1000pF/2KV 1.5mH 3.4uH

ESR<0.33Ω ESR<0.33Ω

47uF/100V 47uF/100V 47uF/100V

KMF KMF KMF

4700pF/2KV 2200pF/2KV 1000pF/2KV 1.5mH 3.4uH

VHK50W-Q48-S48

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 503.612.2383 www.v-infinity.com

page

date 08/2009

11 of 11

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 503.612.2383 www.v-infinity.com


型号：	VHK50W-Q24-S28
厂家：	CUI INC
描述：	chassis mount dc-dc converter 底座安装的DC-DC转换器转换器 DC-DC转换器
文件：	总11页 (文件大小：954K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

VHK50W-Q24-S28 [CUI]

相关型号：

VHK50W-Q24-S28-DIN

VHK50W-Q24-S3R3

VHK50W-Q24-S3R3-DIN

VHK50W-Q24-S48

VHK50W-Q24-S48-DIN

VHK50W-Q24-S5

VHK50W-Q24-S5-DIN

VHK50W-Q48-S12

VHK50W-Q48-S12-DIN

VHK50W-Q48-S15

VHK50W-Q48-S15-DIN

VHK50W-Q48-S24