75W DC-DC Half-Brick Regulated Single Output Converter
Features :
MHB75
series
Half-brick size (2.28" 2.4" 0.5") with industry standard pin out
2:1 wide input range
Protections: Short circuit / Over current / Over voltage / Over temperature
High efficiency up to 89%
1500VDC I/O isolation
Built-in remote ON/OFF control
Built-in remote sense function
Trimming output 10%
Five-sided shield metal case
Optional heat sinks for extended operating temperature
Output 2.5V/3.3V/15V available
Approvals: UL / CUL / CE
3 years warranty
SPECIFICATION
MODEL
DC VOLTAGE
CURRENT RANGE
RATED POWER
VOLTAGE ACCURACY
Note.3
LINE REGULATION
LOAD REGULATION
MHB75-12S05 MHB75-12S12 MHB75-12S24 MHB75-24S05 MHB75-24S12 MHB75-24S24 MHB75-48S05 MHB75-48S12 MHB75-48S24
5V
0 ~ 15A
75W
100mVp-p
240mVp-p
75mVp-p
100mVp-p
240mVp-p
75mVp-p
100mVp-p
240mVp-p
1.0%
0.2%
0.2%
12V
0 ~ 6.25A
24V
0 ~ 3.13A
5V
0 ~ 15A
12V
0 ~ 6.25A
24V
0 ~ 3.13A
5V
0 ~ 15A
12V
0 ~ 6.25A
24V
0 ~ 3.13A
RIPPLE & NOISE (max.)
Note.2
75mVp-p
OUTPUT
SWITCHING FREQUENCY (Typ.)
400KHz for 12/24Vin, 300KHz for 48Vin
EXTERNAL TRIM ADJ. RANGE (Typ.)
10%
EXTERNAL CAPACITIVE LOAD (max.)
10000uF
RATED DC INPUT
VOLTAGE RANGE
UNDER VOLTAGE LOCKOUT
EFFICIENCY (Typ.)
FULL LOAD
DC CURRENT
NO LOAD
FILTER
OUTPUT OVER CURRENT
PROTECTION OUTPUT OVER VOLTAGE (Typ.)
OUTPUT SHORT CIRCUIT
OVER TEMPERATURE
REMOTE CONTROL
12VDC
9 ~ 18VDC
Power up: 8.8VDC, Power down: 8VDC
83%
87%
87%
7570mA
50mA
Pi-network
7200mA
7200mA
10000uF
2000uF
10000uF
24VDC
18 ~ 36VDC
50VDC
Power up: 17VDC, Power down: 16VDC
84%
88%
88%
3780mA
50mA
3650mA
3650mA
10000uF
2000uF
10000uF
48VDC
36 ~ 75VDC
100VDC
Power up: 34VDC, Power down: 32.5VDC
84%
89%
89%
1900mA
50mA
1800mA
1800mA
10000uF
2000uF
SURGE VOLTAGE (100ms max.)
25VDC
INPUT
110 ~ 150% rated output power
Protection type : Over current limiting, recovers automatically after fault condition is removed
115 ~ 140% rated output voltage
Protection type : Output voltage clamp by TVS diode
Protection type : Can be continuous, recovers automatically after fault condition is removed
100
5 of case temperature
Please refer to "Remote ON/OFF Control" for details
FUNCTION
OPERATING OUTPUT TRIMMING
10%, Please refer to "External Output Trimming" for details
5 of case temperature (please refer to "Thermal Curve")
WORKING TEMPERATURE (Typ.)
-40 ~ +100 ; Thermal shutdown at 100
0% ~ 95% RH max.
WORKING HUMIDITY
ENVIRONMENT
STORAGE TEMP., HUMIDITY
-55 ~ +105 , 0 ~ 95% RH
TEMP. COEFFICIENT
SAFETY STANDARDS
SAFETY & ISOLATION VOLTAGE
ISOLATION RESISTANCE
EMC
(Note 4)
EMC EMISSION
EMC IMMUNITY
CASE MATERIAL
OTHERS
MTBF
DIMENSION
WEIGHT
NOTE
0.03%/ (0~60
UL60950-1 approved
I/P-O/P:1500VDC, I/P-Case:1500VDC, O/P-Case:1500VDC
I/P-O/P:100M Ohms / 500VDC / 25 / 70% RH
Compliance to EN55022 (CISPR22) Class A with external components (please refer to "EMC Suggestion Circuit")
Compliance to EN61000-4-2,3,4,5,6,8; EN55024, light industry level, criteria A
Aluminum
1000K hrs typ. MIL-HDBK-217F (25 )
57.9*61*12.7mm (2.28"*2.40"*0.5") (L*W*H)
92g
1. All parameters NOT specially mentioned are measured at 12,24,48VDC input, rated load and 25 of ambient temperature.
2. Ripple & noise are measured at 20MHz of bandwidth by using a 12" twisted pair-wire terminated with a 1uf ceramic & 10uf tantalum capacitor across output.
3. The power supply need to connect "+Vout" to "+R.S" and "-Vout" to "-R.S".
4. The power supply is considered a component which will be installed into a final equipment. The final equipment must be re-confirmed that it still meets
EMC directives. For guidance on how to perform these EMC tests, please refer to EMI testing of component power supplies.
File Name:MHB75-SPEC 2011-09-08
75W DC-DC Half-Brick Regulated Single Output Converter
Mechanical Specification
All Dimensions In Inches [mm]
Tolerance Inches: X.XX= 0.02 , X.XXX= 0.010
Millimeters: X.X= 0.5 , X.XX= 0.25
MHB75
series
Unit:inch[mm]
0.18 min. 0.50
[4.6] [12.7]
Mounting Inserts M3*0.5
BOTTOM VIEW
R1.50
3
6
7
1.40
[35.56]
2.40
[61.0]
2.00
[50.8]
0.60
[15.24]
2
8
1
9
0.04
[1.02]
4
5
0.08
[2.03]
1.90
[48.3]
2.28
[57.9]
SIDE VIEW
Pin No. Assignment
Pin No.
1
2
3
Assignment
+Vin
R.C.
Case
Pin No.
4
5
6
Assignment
-Vin
-Vout
-R.S.
Pin No.
7
8
9
Assignment
Trim
+R.S.
+Vout
Remote ON/OFF Control
The MHB75 series allow the user to switch the power ON and OFF electronically by their remote ON/OFF feature.
The MHB75 series are available with "Positive Logic" (standard) or "Negative Logic" (option).
Logic table
Logic State(pin2)
Logic Low-Switch Closed
Logic High-Switch Open
Positive logic
Power OFF(<0.8Vdc)
Negative logic
Power ON(<0.8Vdc)
Power ON(Open circuit) Power OFF(Open circuit)
Note: 1.Logic compatibility : R.C.(pin2) ~ -Vin(pin4).
2.Suffix "N" to the model number with Negative logic remote ON/OFF.
R.C.(pin2)
MHB75
High singal here
disable output
-Vin(pin4)
Example control circuit(positive logic)
File Name:MHB75-SPEC 2011-09-08
75W DC-DC Half-Brick Regulated Single Output Converter
External Output Trimming
MHB75
series
+Vin
(pin1)
MHB75
-Vin
(pin4)
+Vout
(pin9)
Trim
(pin7)
R
Trim-up
-Vout
(pin5)
R
-Load
+Vin
(pin1)
MHB75
-Vin
(pin4)
+Vout
(pin9)
Trim
(pin7)
-Vout
(pin5)
R
Trim-down
R
-Load
Figure 1 : Trim-up voltage setup
The value of R
Trim-up
defined as:
(R1-R2 (V
o
-V
o
, nom))
R
Trim-up
=
(V
o
-V
o
, nom)
(K )
Figure 2 : Trim-down voltage setup
The value of R
Trim-down
defined as:
(R1-R2 (V
o
, nom-V
o
))
R
Trim-down
=
(V
o
, nom-V
o
)
(K )
Where: R
Trim-up
is the external resistor in Kohm.
Vo,nom is the nominal output voltage.
Vo is the desired output voltage.
R1 and R2 are inside the unit and list in Table 1
Output
Voltage(V)
5V
12V
24V
R1
(Kohm)
5.8
19.656
42.215
Table 1
For example, to Trim-up the output
voltage of 5.0V model (MHB75-48S05)
by 8% to 5.4V, R
Trim-up
is calculated
as follows:
Vo - Vo,nom = 5.4 -5.0 = 0.4V
R1 = 5.8 Kohm
R2 = 8.25 Kohm
5.8-8.25 0.4
R
Trim-up
=
0.4
= 6.25 (K )
R2
(Kohm)
8.25
13.304
16.923
Where: R
Trim-down
is the external resistor in Kohm.
Vo,nom is the nominal output voltage.
Vo is the desired output voltage.
R1 and R2 are inside the unit and list in Table 2.
Output
Voltage(V)
5V
12V
24V
R1
(Kohm)
5.8
86.45
430
Table 2
For example, to Trim-down the output
Voltage of 5.0V model (MHB75-48S05)
by 8% to 4.6V, R
Trim-down
is
calculated as follows :
Vo,nom - Vo = 5.0 - 4.6 = 0.4 V
R1 = 5.8 Kohm
R2 = 10.57 Kohm
5.8-10.57 0.4
R
Trim-down
=
0.4
= 3.93 (K )
R2
(Kohm)
10.57
60.1
130
File Name:MHB75-SPEC 2011-09-08
75W DC-DC Half-Brick Regulated Single Output Converter
Thermal Curve
MHB75
series
The operating case temperature range of MHB-75 series is -40
o
C to +100
o
C. When operate the MHB-75 series, proper de-rating or
cooling is needed.
o
The maximum case temperature under any operating condition should not be exceed 100 C. The following curve is the de-rating
curve of MHB-75 series without heat sink.
Power Dissipated vs Amb ient Temperature and Air Flow without heatsink
50
45
40
Na tural Co nvection
20 ft. /min. (0.1 m/s)
100 f t./min. (0 .5 m/s)
200 f t./min. (1 .0 m/s)
Power Disspated, P
d
(Watts )
35
30
25
20
15
10
5
0
0
10
20
30
40
50
60
70
80
90
100
300 f t./min. (1 .5 m/s)
400 f t./min. (2 .0 m/s)
500 f t./min. (2 .5 m/s)
600 f t./min. (3 .0 m/s)
700 f t./min. (3 .5 m/s)
800 f t./min. (4 .0 m/s)
Ambi ent Temperature, Ta (
)
Air Flow Rate
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)
Typical Rca
7.12
6.21
5.17
4.29
3.64
/W
/W
/W
/W
/W
Air Flow Rate
500 ft./min. (2.5m/s)
600 ft./min. (3.0m/s)
700 ft./min. (3.5m/s)
800 ft./min. (4.0m/s)
Typical Rca
2.96
2.53
2.37
2.19
/W
/W
/W
/W
Rca : Thermal resistance from case to
ambience
Example:
What is the minimum airflow necessary for a MHB75-48S12 operates at nominal line, an output current of 6.25A, and a maximum ambient
temperature of 40 ?
Solution:
Given: Vin=48Vdc, Vo=12Vdc, Io=6.25A, (unit efficiency)=89%
Determine Power dissipation (P
d
):
P
d
=Pi-Po=Po(1- )/
P
d
=12 6.25 (1-0.89)/0.89=9.27 Watts
Determine airflow:
Given: P
d
=9.27W and Ta=40
Check Thermal Curve above:
minimum airflow= 100 ft./min.
Verifying: The maximum temperature rise
T = P
d
Rca=
9.27 6.21=57.57
The maximum case temperature
Tc=Ta+ T=
97.57 <100
Where: The Rca is thermal resistance from case to ambience.
The Ta is ambient temperature and the Tc is case temperature.
File Name:MHB75-SPEC 2011-09-08
75W DC-DC Half-Brick Regulated Single Output Converter
Case Heat Sink (Optional)
MHB75
series
Unit:mm
Model No.: M-C308 (Vertical Fins)
Model No.: M-C091(Horizontal Fins)
Model No.: M-C092 (Horizontal Fins)
58
48.20
61
50.8
61
50.8
3.3
4-
60.70
50.80
48.2
2.-8.50
5.-7.80
R1
8-2
3 0.3
12.7
2.7
25.4
21
CR0.3
0.30
Rca:
3.90
1.74
1.33
1.12
0.97
/ W (typ.), at natural convection
/ W (typ.), at 100ft./min.(LFM)
/ W (typ.), at 200ft./min.(LFM)
/ W (typ.), at 300ft./min.(LFM)
/ W (typ.), at 400ft./min.(LFM)
Rca:
4.70
2.89
2.30
1.88
1.59
/ W (typ.), at natural convection
/ W (typ.), at 100ft./min.(LFM)
/ W (typ.), at 200ft./min.(LFM)
/ W (typ.), at 300ft./min.(LFM)
/ W (typ.), at 400ft./min.(LFM)
Rca:
3.00
1.44
1.17
1.04
0.95
2.7
48.2
58
58
/ W (typ.), at natural convection
/ W (typ.), at 100ft./min.(LFM)
/ W (typ.), at 200ft./min.(LFM)
/ W (typ.), at 300ft./min.(LFM)
/ W (typ.), at 400ft./min.(LFM)
File Name:MHB75-SPEC 2011-09-08
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