VHB150W-Q24-S12 [CUI]
half-brick dc-dc converter; 半砖DC- DC转换器
| 型号： | VHB150W-Q24-S12 |
| 厂家： | 
CUI INC |
| 描述： | half-brick dc-dc converter |
| 文件： | 总9页 (文件大小：995K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
page
1 of 9
date 08/2009
PART NUMBER: VHB150W
DESCRIPTION: half-brick dc-dc converter
description
features
The VHB150W series of DC-DC converters
are designed for high reliability
applications, featuring over-temperature
protection, and over-current protection.
The wide 4:1 input range (9-36V or 18-
75V) is very useful to stabilize an input
source like batteries in various
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
applications.
·99-150W isolated output
·Efficiency to 90%
·RoHS Compliant
·4:1 input range
·Regulated output
·Continuous short circuit
protection
·remote on/off
·over-voltage/current protection
·over-temperature shutdown
·industry standard ½ brick size
MODEL
input voltage
output
voltage
(V dc)
output
current
(A)
input current
efficiency
typ.
(%)
1
2
2
3
nominal
(V dc)
range
(V dc)
no load
full load
(mA)
(mA)
200
200
100
100
100
100
100
50
VHB150W-Q24-S3R3
VHB150W-Q24-S5
VHB150W-Q24-S12
VHB150W-Q24-S15
VHB150W-Q24-S24
VHB150W-Q48-S3R3
VHB150W-Q48-S5
VHB150W-Q48-S12
VHB150W-Q48-S15
VHB150W-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
30
30
4741
7022
6944
6944
7022
2371
3511
3472
3472
3511
85
87
88
88
88
87
89
90
90
89
12
15
24
3.3
5
12.5
10
6.5
30
30
12
15
24
12.5
10
50
6.5
50
notes:
1. see output derating (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
nom
24
48
8.8
8
max
36
units
V dc
V dc
V dc
V dc
V dc
V dc
input voltage range
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 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 9
PART NUMBER: VHB150W
DESCRIPTION: half-brick dc-dc converter
OUTPUT
parameter
conditions/description
25% step load change
3.3V, 5V
min
nom
max
±1.5
500
±10
40
units
%
voltage accuracy
transient response
external trim adj. range
ripple & noise (20MHz BW)
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 regulation5
±0.03
continuous
±0.2
±1
%
%
%
%
load regulation6
over voltage protection trip range, % Vo nom.
115
110
140
140
over current protection
% nominal output current
GENERAL SPECIFICATIONS
parameter
conditions/description
min
nom
max
units
KHz
°C
switching frequency
operating ambient temp.7
storage temperature
thermal shutdown case temp.
case material
250
-40
-55
100
105
°C
90
°C
aluminum
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:
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 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 503.612.2383 www.v-infinity.com
page
date 08/2009
3 of 9
PART NUMBER: VHB150W
DESCRIPTION: half-brick dc-dc converter
MECHANICAL DRAWING
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 9
PART NUMBER: VHB150W
DESCRIPTION: half-brick dc-dc converter
APPLICATION NOTES
1. OUTPUT DE-RATING
The operating case temperature range for VHB150W is -40 ~ +100°C. When operating the VHB150W series, proper derating or
cooling is needed. The maximum case temperature under any operating condition should not exceed 100°C.
Power Dissipated vs Ambient Temperature and Air Flo w
Natural Convection
20 ft./min. (0.1 m/s)
100 ft./min. (0.5 m/s)
200 ft./min. (1.0 m/s)
300 ft./min. (1.5 m/s)
400 ft./min. (2.0 m/s)
500 ft./min. (2.5 m/s)
600 ft./min. (3.0 m/s)
700 ft./min. (3.5 m/s)
800 ft./min. (4.0 m/s)
Ambient Temperature ,Ta(Deg. C)
FIGURE 1. OUTPUT DERATING (FORCED CONVECTION WITH NO HEAT SINK)
Example:
What is the minimum airflow necessary for a VHB150W-Q48-S12
AIR FLOW RATE
TYPICAL Rca
7.12 /W
operating at nominal line, an output current of 12.5 A, and a
maximum ambient temperature of 50°C?
Natural Convection
20ft./min. (0.1m/s)
100 ft./min. (0.5m/s)
200 ft./min. (1.0m/s)
300 ft./min. (1.5m/s)
400 ft./min. (2.0m/s)
500 ft./min. (2.5m/s)
600 ft./min. (3.0m/s)
700 ft./min. (3.5m/s)
800 ft./min. (4.0m/s)
Solution:
6.21 /W
5.17 /W
4.29 /W
3.64 /W
2.96 /W
2.53 /W
2.37 /W
2.19 /W
Given: Vin=48 V dc, Vo=12 V dc, Io=12.5 A
Determine Power dissipation (Pd):
Pd=Pi-Po=Po(1-η)/η
Pd=12×12.5×(1-0.9)/0.9=16.67 W
Determine airflow:
Given: Pd=16.67 W and Ta=50°C
Check above Power de-rating curve:
minimum airflow= 500 ft./min.
Verifying:
Chart of Thermal Resistance vs Air Flow
The maximum temp. rise ΔT = Pd × Rca=16.67×2.96=49.34°C. The maximum case temperature Tc=Ta+ΔT=99.34°C<100°C
Where:
The Rca is thermal resistance from case to ambience.The Ta is ambient temperature and the Tc is case temperature.
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 9
PART NUMBER: VHB150W
DESCRIPTION: half-brick dc-dc converter
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.
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 VHB150W-Q24-S5 to operate with 9~36 V input, 150 W output and an efficiency of 87%, the minimum
source current is recommended to be: Ipeak = 150% * 150 / (87% * 9) = 28.74 A.
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 VHB150W-Q24-S5, the peak input current at 9V was calculated to be 28.74 A. A 30 A fuse may be suitable
for this application. Make sure the fuse voltage rating is higher than the maximum input voltage.
6. 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
-Vo
FIGURE 2. REMOTE SENSE
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 9
PART NUMBER: VHB150W
DESCRIPTION: half-brick dc-dc converter
7. 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
+Vo
+Vin
+Vin
+S
+S
R trim-down
R load
Trim
Trim
R load
)
R trim-up
-S
-S
-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:
(R − R ×(
))
Vo –Vo,nom
(R − R ×(
))
Vo,nom –Vo
1
2
1
2
=
(k Ω)
=
(k Ω)
(
)
(
)
Vo –Vo,nom
Vo,nom –Vo
Where: Rtrim-up is the external resistor in KΩ. Vo,nom is
the nominal output voltage. Vo is the desired output voltage.
R1 and R2 are internal to the unit and are defined in Table 1.
For example, to trim-up the output voltage of 5.0V module
(VHB150W-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 and R2 are internal to the unit and are defined in Table 2.
For example, to trim-down the output voltage of 5.0V module
(VHB150W-Q48-S5) by 8% to 4.6V, Rtrim-down is calculated
as follows:
Vo – Vo,nom = 5.4 – 5.0 = 0.4V
Vo,nom – Vo = 5.0 – 4.6 = 0.4V
R
R
R
R
1 = 5.8 kΩ
2 = 3.3 kΩ
1 = 5.8 kΩ
2 = 5.32 kΩ
(5.8−3.3×(
))
(5.8−5.32×(
))
5.4 –5
)
5–4.6
=
= 9.18kΩ
=
=11.2kΩ
(
(
)
5– 4.6
5.4– 5
Output
R1
R2
Output
R1
R2
Voltage(V) (Kohm) (Kohm)
Voltage(V) (Kohm) (Kohm)
3.3V
5V
12V
15V
24V
3.168
5.8
18.945 4.636
25.189 7.191
41.442 6.977
7.2
3.3
3.3V
5V
12V
15V
24V
6.18
5.8
86.45
150
15
5.62
60.1
68
Table 1
Table 2
430
120
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 9
PART NUMBER: VHB150W
DESCRIPTION: half-brick 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 100°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 100°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. One may be inclined to use this circuit to force current sharing by trim-
ming the output voltages for each converter. However, this circuit may 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 recom-
mend 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
th
20050 SW 112 Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2383 www.v-infinity.com
page
date 08/2009
8 of 9
PART NUMBER: VHB150W
DESCRIPTION: half-brick 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 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
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
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.
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 9
PART NUMBER: VHB150W
DESCRIPTION: half-brick dc-dc converter
17. 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.
18. 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 10. OUTPUT NOISE MEASUREMENT CIRCUIT
th
20050 SW 112 Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2383 www.v-infinity.com
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