LAST TIME BUY: 3/31/2015. CLICK HERE FOR OBSOLESCENCE NOTICE OF 10/31/2014.
www.murata-ps.com
UHE Series
Isolated, High Efficiency, 1.6" × 2"
2-10
Amp, 12-30 Watt DC/DC Converters
Housed in smaller, 1.6" x 2" x 0.40" (41 x 51 x 10.2mm)
packages carrying the standard 2" x 2" pinout, MPS’s new
UHE Series DC/DC Converters deliver more current/power
(up to 10A/30W) than currently available from either
package size.
Typical units
FEATURES
n
most I
OUT
/P
OUT
in this format
The
n
Lower priced than bricks
n
Small 1.6" x 2" x 0.4" plastic package
with standard 2" x 2" pinout
n
Output configurations:
1.2/1.5/1.8/2.5V
OUT
@ 10 Amps
3.3/5V
OUT
@ 25 Watts
5/12/15V
OUT
@ 30 Watts
n
input ranges from 9-75 Volts
Five
n
Efficiencies as high as 91.5%
n
Stable no-load operation
n
Optional Sense pins for low V
OUT
n
Thermal shutdown, I/O protected
n
Vdc I/O BASIC Insulation
1500
n
UL/EN60950-1 certified (2nd Edition);
CE marked for Q48 models
n
compliant
RoHS
+INPUT
(1)
PRODUCT OVERVIEW
The UHE 12-30W Series of high-efficiency,
isolated DC/DC’s provide output power ranging
from 10 Amps @ 1.2V to 2 Amps @ 15V. Offering
both 2:1 and 4:1 input voltage ranges, UHE’s meet
V
in
requirements from 9 to 75 Volts.
Taking full advantage of the synchronous-
rectifier, forward topology, UHEs boast outstanding
efficiency (some models exceed 91%) enabling
full-power operation to ambient temperatures as
high as +60°C, without air flow. Assembled using
fully automated, SMT-on-pcb techniques, UHEs
provide stable no-load operation, excellent line
(±0.1%) and load (±0.15%) regulation, quick step
response (200µsec), and low output ripple/noise
(50-100mVp-p). Additionally, the UHEs unique
output design eliminates one of the topology’s few
shortcomings–output reverse conduction.
All devices feature full I/O fault protection
including: input overvoltage and undervoltage
shutdown, precise output overvoltage protection
(a rarity on low-voltage outputs), output current
limiting, short-circuit protection, and thermal
shutdown.
All UHE models incorporate a V
out
Trim function
and an On/Off Control pin (positive or negative
logic). Low-voltage models (1.2V to 5V) offer
optional sense pins facilitating either remote load
regulation or current sharing for true N+1 redun-
dancy. All models are certified to the BASIC insula-
tion requirements of UL/EN60950-1 (2nd Edition),
and 48V
in
(75V max.) models carry the CE mark.
Selected models are RoHS compliant (Reduction
of Hazardous Substances).
+OUTPUT
(6)
SWITCH
CONTROL
+SENSE
(5)
–OUTPUT
(7)
OPTO
ISOLATION
OVERVOLTAGE
COMPARATOR
PWM
CONTROLLER
UVLO & OVLO
COMPARATORS
ON/OFF
CONTROL
(4)
–SENSE
(8)
–INPUT
(2)
THERMAL
SHUTDOWN
OPTO
ISOLATION
REFERENCE &
ERROR AMP
V
OUT
TRIM
(9)
Typical topology is shown.
Optional comparator feedback. Contact MPS.
Sense pins are optional on 1.2-5V
OUT
models ("R" suffix).
For full details go to
www.murata-ps.com/rohs
*
Figure 1. Simplified Block Diagram
One phase of two is shown.
www.murata-ps.com/support
MDC_UHE_12-30W Series.D01
Page 1 of 16
UHE Series
Isolated, High Efficiency, 1.6" × 2"
2-10
Amp, 12-30 Watt DC/DC Converters
PERFORMANCE SPECIFICATIONS SUMMARY AND ORDERING GUIDE
➀
Output
Model Family
Regulation (Max.)
R/N (mVp-p)➁
(See model numbering
V
OUT
I
OUT
Max.
Line
on page 3)
Load
➃
(Volts) (Amps) Typ.
UHE-1.2/10000-D12-C
UHE-1.2/10000-D24-C
UHE-1.2/10000-D48-C
UHE-1.5/10000-D24-C
UHE-1.5/10000-D48-C
UHE-1.8/10000-D24-C
UHE-1.8/10000-D48-C
UHE-2.5/10000-D24-C
UHE-2.5/10000-D48-C
UHE-3.3/7500-Q12-C
UHE-3.3/7500-Q48-C
UHE-3.3/7500-D48-C
UHE-3.3/7500-D48T-C
UHE-5/5000-Q12-C
UHE-5/5000-Q48-C
UHE-5/6000-Q12-C
UHE-5/6000-D48-C
UHE-5/6000-D48T-C
UHE-5/6000-Q48T-C
UHE-12/2500-Q12-C
UHE-12/2500-D12-C
UHE-12/2500-D24-C
UHE-12/2500-Q48-C
UHE-12/2500-D48-C
UHE-15/2000-D12-C
UHE-15/2000-Q12-C
UHE-15/2000-D24-C
UHE-15/2000-Q48-C
UHE-15/2000-D48-C
1.2
1.2
1.2
1.5
1.5
1.8
1.8
2.5
2.5
3.3
3.3
3.3
3.3
5
5
5
5
5
5
12
12
12
12
12
15
15
15
15
15
10
10
10
10
10
10
10
10
10
7.5
7.5
7.5
7.5
5
5
6
6
6
6
2.5
2.5
2.5
2.5
2.5
2
2
2
2
2
80
80
80
55
55
70
50
50
65
70
90
80
80
50
60
50
80
65
55
125
65
65
100
60
70
70
70
100
70
120
120
120
80
80
90
75
100
120
90
125
100
100
70
90
70
100
100
80
165
100
100
120
100
100
100
100
150
100
±0.1%
±0.1%
±0.1%
±0.1%
±0.1%
±0.1%
±0.1%
±0.075%
±0.1%
±0.25%
±0.35%
±0.2%
±0.2%
±0.1%
±0.05%
±0.1%
±0.2%
±0.2%
±0.08%
±0.1%
±0.2%
±0.2%
±0.1%
±0.2%
±0.2%
±0.05%
±0.2%
±0.1%
±0.2%
±0.36/0.9%
±0.25/0.9%
±0.3/0.625%
±0.15/0.625%
±0.15/0.625%
±0.15/0.625%
±0.15/0.625%
±0.15/0.5%
±0.15/0.5%
±0.2/0.5%
±0.5%
±0.5%
±0.5%
±0.15/0.3%
±0.15/0.3%
±0.3%
±0.25/0.5%
±0.5%
±0.15%
±0.5%
±0.3%
±0.3%
±0.5%
±0.3%
±0.3%
±0.15%
±0.3%
±0.5%
±0.3%
Input
V
IN
Nom. Range
(Volts) (Volts)
12
24
48
24
48
24
48
24
48
24
48
48
48
24
48
24
48
48
48
24
12
24
48
48
12
24
24
48
48
9-18
18-36
36-75
18-36
36-75
18-36
36-75
18-36
36-75
9-36
18-75
36-75
36-75
9-36
18-75
9-36
36-75
36-75
18-75
9-36
9-18
18-36
18-75
36-75
9-18
9-36
18-36
18-75
36-75
I
in
➂
(mA/A)
75/1.2
35/0.6
35/0.31
35/0.73
35/0.38
35/0.86
35/0.44
35/1.23
35/0.59
50/1.17
38/0.57
35/0.6
35/0.58
50/1.2
38/0.58
50/1.44
45/0.7
45/0.7
38/0.69
55/1.43
90/2.81
55/1.39
30/0.6
30/0.7
110/2.81
50/1.4
70/1.39
45/0.69
35/0.7
Efficiency
Min. Typ.
81%
82.2%
81%
84%
82.5%
85.5%
83.5%
87.7%
87%
85%
88%
86.7%
85.5%
86%
87.5%
86.5%
87.5%
87.5%
88.5%
85.5%
87%
88%
88%
90%
87%
88%
88%
88%
90%
83.5%
83%
83%
85.5%
84%
87%
85%
88.7%
88.5%
88%
90%
88.7%
88.2%
87.5%
90%
87%
89%
91%
90%
87.5%
89%
90%
90%
92%
89%
89.5%
90%
90%
92%
Package
(Case/
Pinout)
C32, P51/52
C32, P51/52
C32, P51/52
C32, P51/52
C32, P51/52
C32, P51/52
C32, P51/52
C32, P51/52
C32, P51/52
C32, P51/52
C32, P51/52
C32, P51/52
C32, P51
C32, P51/52
C32, P51/52
C32, P51/52
C32, P51/52
C32, P51
C32, P51
C32, P51
C32, P51
C32, P51
C32, P51
C32, P51
C32, P51
C32, P51
C32, P51
C32, P51
C32, P51
To Be Discontinued*
To Be Discontinued*
To Be Discontinued*
*LAST TIME BUY: 3/31/2015. CLICK HERE FOR OBSOLESCENCE NOTICE OF 10/31/2014.
Typical at T
A
= +25°C under nominal line voltage and full-load conditions, unless noted.
Ripple/Noise (R/N) is tested/specified over a 20MHz bandwidth. All models are specified with
an external 0.47µF multi-layer ceramic capacitor installed across their output pins.
Nominal line voltage, no-load/full-load conditions.
Devices have no minimum-load requirements and will regulate under no-load conditions.
Regulation specifications describe the output voltage deviation as the line voltage or load
(with/without sense option) is varied from its nominal/midpoint value to either extreme.
To Be Discontinued:
UHE-3.3/7500-D48
UHE-3.3/7500-D48N
UHE-3.3/7500-D48N-31016
UHE-3.3/7500-D48N-C
UHE-3.3/7500-D48NR-C
UHE-3.3/7500-D48R-C
UHE-3.3/7500-D48T
UHE-3.3/7500-D48T-31137-Y
UHE-3.3/7500-D48T-C
UHE-3.3/7500-D48THL2-C
UHE-3.3/7500-D48THL2-C-HW
UHE-3.3/7500-D48THL2-Y
UHE-3.3/7500-Q12
UHE-3.3/7500-Q12N
UHE-3.3/7500-Q12N-C
UHE-3.3/7500-Q12NR
UHE-3.3/7500-Q12NR-C
UHE-3.3/7500-Q12R
UHE-3.3/7500-Q12R-C
UHE-3.3/7500-Q48
UHE-3.3/7500-Q48N
UHE-3.3/7500-Q48N-C
UHE-3.3/7500-Q48NR-C
UHE-3.3/7500-Q48R-C
UHE-5/5000-Q12
UHE-5/5000-Q12N
UHE-5/5000-Q12N-C
UHE-5/5000-Q12NR
UHE-5/5000-Q12NR-C
UHE-5/5000-Q12R
UHE-5/5000-Q12R-C
UHE-5/5000-Q48
UHE-5/5000-Q48N
UHE-5/5000-Q48N-C
UHE-5/5000-Q48NR
UHE-5/5000-Q48NR-C
UHE-5/5000-Q48R
UHE-5/5000-Q48R-C
UHE-5/6000-D48N-30749-Y
UHE-5/6000-D48N-C
UHE-5/6000-D48NR
UHE-5/6000-D48NR-C
UHE-5/6000-D48R
UHE-5/6000-D48R-C
UHE-5/6000-D48T-31136-C
UHE-5/6000-D48T-31136-Y
UHE-5/6000-D48T-C
UHE-5/6000-D48THL2-C
UHE-5/6000-D48THL2-C-HW
UHE-5/6000-D48THL2-Y
UHE-5/6000-D48-Y
UHE-5/6000-D48-Y-CIS
UHE-5/6000-Q12N
UHE-5/6000-Q12N-C
UHE-5/6000-Q48T-C
UHE-12/2500-D12
UHE-12/2500-D12N
UHE-12/2500-D12N-C
UHE-12/2500-D24
UHE-12/2500-D24N
UHE-12/2500-D24N-C
UHE-12/2500-D48
UHE-12/2500-D48N
UHE-12/2500-D48N-C
UHE-12/2500-Q12
UHE-12/2500-Q12N
UHE-12/2500-Q12N-C
UHE-12/2500-Q48
UHE-12/2500-Q48N
UHE-12/2500-Q48N-C
UHE-12/2500-Q48-Y
UHE-15/2000-D12
UHE-15/2000-D12N
UHE-15/2000-D12N-C
UHE-15/2000-D24
UHE-15/2000-D24N
UHE-15/2000-D24N-C
UHE-15/2000-D48
UHE-15/2000-D48N
UHE-15/2000-D48N-C
UHE-15/2000-Q12
UHE-15/2000-Q12N
UHE-15/2000-Q48
UHE-15/2000-Q48N
UHE-15/2000-Q48N-C
www.murata-ps.com/support
MDC_UHE_12-30W Series.D01
Page 2 of 16
UHE Series
Isolated, High Efficiency, 1.6" × 2"
2-10
Amp, 12-30 Watt DC/DC Converters
PART NUMBER STRUCTURE
U HE
-
3.3
/
7500
-
D48 N
-
C
Output Configuration:
U
= Unipolar
RoHS-6 hazardous substance compliant
(Does not claim EU exemption 7b, lead in solder)
On/Off Logic
Blank
= Positive logic, standard
N
= Negative logic
R
= See Below
optional, special order
NR
= See Below
High Efficiency
Nominal Output Voltage:
1.2, 1.5, 1.8, 2.5, 3.3, 5, 12 or 15
Maximum Rated Output
Current in mA
}
Input Voltage Range:
D12
= 9-18 Volts
D24
= 18-36 Volts
D48
= 36-75 Volts
Q12
= 9-36 Volts
Q48
= 18-75 Volts
Note:
Some model number
combinations may not be available.
Contact Murata Power Solutions.
Options and Adaptations
Optional Functions and Part Number Suffixes
The versatile UHE, 12-30W DC/DC converters offer numerous electrical and
mechanical options. Per the Ordering Guide on page 2, the trailing DXX or QXX
(where XX stands for 12, 24 or 48V
in
) in each part number pertains to the base
part number. Part-number suffixes are added after this input identification,
indicating the selection of standard options. The resulting part number is a
"standard product" and is available to any customer desiring that particular
combination of options.
The On/Off Control function on pin 4 employs a positive logic (on = open or
"high," no suffix). To request a negative logic on this pin/function, add an "N"
suffix to the part number. Standard models have no pins in the pins 5 and 8
positions. For 5-10A models (1.2-5V
out
), ±Sense pin/functions can be added to
these positions (see pinout P52) by adding an "R" suffix. An "NR" suffix can be
added for both negative-logic and sense-pin options. See below.
Suffix Description
Blank
Positive logic On/Off Control function (pin 4), V
out
trim (pin 9),
no Sense pins, pin length 0.2 inches (5.08 mm).
N
R
Add Negative logic on the On/Off Control function, VOUT trim (pin 9),
no Sense pins.
Positive logic on the On/Off Control function, V
out
trim (pin 9), ±Sense
pins in the pin 5 and pin 8 positions (available for low V
out
models
only). Available under special order.
Negative logic on the On/Off Control function, V
out
trim (pin 9), +/–
Sense pins in the pin 5 and pin 8 positions (available for low V
out
models only). Available under special order.
Alternate pin lengths are available under special order
T
-C
-Y
Alternate trim configuration. Special order only.
Full RoHS-6 compliance.
RoHS-5 hazardous substance compliance with lead exception. RoHS-5
compliance requires a scheduled quantity order. Not all RoHS-5 “-Y”
models are available. Please contact Product Marketing for further
information.
Adaptations
There are various additional configurations available on UHE, 12-30W DC/DCs.
Because designating each of them with a standard part-number suffix is not
always feasible, such are designated by MPS in assigning a 5-digit “adaptation
code” after the part-number suffixes. Contact MPS directly if you are interested
in your own set of options/adaptations. Our policy for minimum order quantities
may apply. Consequently, the following products are offered for sale:
UHE-5/6000-D48N-30749
UHE-5/6000-D48N-30749-Y (RoHS-5)
Standard product, 48V
in
, 5V/6A output with negative logic on the On/Off Control
function, modified Trim function (5% trim up = 9.09kΩ, 5% trim down =
3.83kΩ, compatible with UEP-30750), integrated soft start and with input OVP
and thermal shutdown removed.
RoHS-5 compliance refers to the exclusion of the six hazardous substances
in the RoHS specification with the excepion of lead. MPS’s RoHS-5 products
use all the conforming RoHS materials, however our solders contain lead.
UHE-3.3/7500-D48THL2-Y and
UHE-5/6000-D48THL2-Y (RoHS-5)
Special trim, conformal coating, 3.68mm pin length, positive on/off logic,
RoHS-5 hazardous substance compliance (with lead).
NR
www.murata-ps.com/support
MDC_UHE_12-30W Series.D01
Page 3 of 16
UHE Series
Isolated, High Efficiency, 1.6" × 2"
2-10
Amp, 12-30 Watt DC/DC Converters
MECHANICAL SPECIFICATIONS
INPUT/OUTPUT CONNECTIONS
Pin
Function P51
1
2
3
4
5
6
7
8
9
+Input
–Input
No Pin
On/Off Control
No Pin
+Output
–Output
No Pin
Trim
Dimensions are in inches (mm) shown for ref. only.
Function P52
+Input
–Input
No Pin
On/Off Control
Sense*
+Output
–Output
–Sense*
Trim
Third Angle Projection
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 2˚
Components are shown for reference only.
* Pins 5 and 8 are installed for optional R-suffix versions of 1.2-5V
OUT
models.
If installed, always connect the sense pins either to a remote load or to their
respective V
out
pin.
See page 3 for complete Part Number structure & ordering details.
2.00
(50.8)
PLASTIC CASE
0.40
(10.2)
STANDOFF
0.020 (0.5)
0.20 MIN
(5.08)
0.040 ±0.001 DIA.
(1.016 ±0.025)
1.800
(45.72)
0.10
(2.54)
0.200
(5.1)
5
1
2
6
0.200
(5.1)
0.400
(10.2)
7
8
9
0.400 (10.16)
2 EQ. SP. @
0.200 (5.08)
1.60
(40.6)
0.400
(10.16)
3
4
0.100
(2.5)
BOTTOM VIEW
0.20
(5.1)
www.murata-ps.com/support
MDC_UHE_12-30W Series.D01
Page 4 of 16
UHE Series
Performance/Functional Specifications
Input
Typical @ T
A
= +25°C under nominal line voltage and full-load conditions, unless noted.
➀ ➁
Isolated, High Efficiency, 1.6" × 2"
2-10
Amp, 12-30 Watt DC/DC Converters
Output
Input Voltage Range:
D12 Models (start up at 10V max.)
Q12 Models (start up at 10V max.)
D24 Models
Q48 Models
D48 Models
Overvoltage Shutdown:
D12 Models
Q12/D24 Models
D48/Q48 Models
Start-Up Threshold:
➁
D12/Q12 Models
D24/Q48 Models
D48 Models
Undervoltage Shutdown:
➁
D12/Q12 Models
D24/Q48 Models
D48 Models
Input Current:
Normal Operating Conditions
Standby Mode (Off, OV, UV)
Input Reflected Ripple Current
➂
Input Filter Type
Reverse-Polarity Protection
Remote On/Off Control (Pin 4):
➃
Positive Logic (Standard)
Negative Logic ("N" Suffix Models)
9-18 Volts (12V nominal)
9-36 Volts (24V nominal)
18-36 Volts (24V nominal)
18-75 Volts (48V nominal)
36-75 Volts (48V nominal)
18.5-23 Volts
37-42 Volts
Not applicable
9.4-10 Volts
15.5-18 Volts
33.5-36 Volts
7.0-8.8 Volts
15-17 Volts
32-35.5 Volts
See Ordering Guide
5mA
2.5-10mAp-p
LC or Pi type
Brief duration, 5A maximum
On = open, open collector, or to +15V
applied. I
IN
= 2.6mA max.
Off = pulled low to 0-0.8V. I
IN
= 2mA max.
On = pulled low to 0-0.8V. I
IN
= 6mA max.
Off = open, open collector or to +15V
applied. I
IN
= 1mA max.
Output
Overvoltage Protection:
1.2V Outputs
1.5V Outputs
1.8V Outputs
2.5V Outputs
3.3V Outputs
5V Outputs
12V Outputs
15V Outputs
Maximum Capacitive Loading:
(Low ESR capacitor)
Dynamic Load Response:
(50-100% load step to ±3% V
OUT
)
Start-Up Time:
➇
V
IN
to V
OUT
and On/Off to V
OUT
UHE-15/2000-Q12
Switching Frequency
MTBF
➈
UHE-12/2500-Q12
Operating Temperature (Ambient):
➉
(see Derating Curves)
Thermal Shutdown
Storage Temperature
Flammability
Dimensions
Case Material
Pin Material
Weight
Primary to Secondary Insulation Level
Magnetic feedback
1.5-2.1 Volts
1.8-2.4 Volts
2.2-2.8 Volts
2.8 to 3.2 Volts
4 to 4.8 Volts
6.1-7.5 Volts
12.7-13.5 Volts
15.8-16.2 Volts
10,000µF (1.2-5V
OUT
)
2,000µF (12-15V
OUT
)
Dynamic Characteristics
200µsec maximum
➇
8msec typical
15msec maximum
30mS typ., 50mS max.
150-350kHz (model dependent)
Environmental
5,885,546 hours
–40 to +85°C with Derating
+115°C to +130°C
–55 to +125°C
UL 94 V-0
Physical
1.6" x 2" x 0.40" (40.64 x 50.8 x 10.16mm)
Diallyl Phthalate
Gold-plated copper alloy
1.51 ounces (46.9 grams)
Basic
V
OUT
Accuracy (50% load):
Initial
Temperatue Coefficient
Extreme
(5)
Minimum Loading for Specification:
➁
Ripple/Noise (20MHz BW)
➀
Line/Load Regulation
Efficiency
V
OUT
Trim Range
(6)
Remote Sense Compensation
➁
Isolation Voltage:
Input-to-Output
Isolation Capacitance
Isolation Resistance
Current Limit Inception (@98%V
OUT
):
➆
10 Amp Models
7.5 Amp Models
5/6 Amp Models
2.5 Amp Models
2.0 Amp Models
Short Circuit Current (Hiccup)
±1.5%
±0.02% per °C
±3%
No load
See Ordering Guide
See Ordering Guide
See Ordering Guide
±5% minimum (±10% for T models)
±5%
1500Vdc minimum (BASIC)
650pF
100MΩ
12-15 Amps
8.2-11.5 Amps
6.5-8.5 Amps
2.6-4 Amps
2.1-3 Amps
1.5-2.3 Amps
➀
All models are tested and specified with a single, external, 0.47µF, multi-layer ceramic output
capacitor and no external input capacitors, unless otherwise noted. All models will effectively
regulate under no-load conditions (with perhaps a slight increase in output ripple/noise).
➁
See Technical Notes/Performance Curves for additional explanations and details.
➂
Input Ripple Current is tested/specified over a 5-20MHz bandwidth with an external 33µF input
capacitor and a simulated source impedance of 220µF and 12µH. See I/O Filtering, Input Ripple
Current and Output Noise for details.
➃
The On/Off Control is designed to be driven with open-collector (or equivalent) logic or the applica-
tion of appropriate voltages (referenced to –Input (pin 2)). Applying a voltage to the On/Off Control
pin when no input voltage is applied to the converter can cause permanent damage. See Remote
On/Off Control for more details.
➄
Extreme Accuracy refers to the accuracy of either trimmed or untrimmed output voltages over all
normal operating ranges and combinations of input voltage, output load and temperature.
➅
Tie the Output Trim pin (pin 9) to +Output (pin 6) for maximum trim down or to –Output (Output
Return/Common, pin 7) for maximum trim up. See Output Trimming for detailed trim equations.
➆
The Current-Limit-Inception point is the output current level at which the converter's power-limiting
circuitry drops the output voltage 2% from its initial value. See Output Current Limiting and
Short-Circuit Protection for more details.
➇
For Start-Up-Time specifications, output settling time is defined as the output voltage having
reached ±1% of its final value at maximum load current.
➈
MTBF’s are calculated using TELCORDIA SR-332 Method 1 Case, ground fixed, +25°C ambient air
and full-load conditions. Contact MPS for demonstrated life-test data.
➉
All models are fully operational and meet all published specifications, including "cold start," at –40°C.
Use only as much output filtering as needed
and no more.
Larger caps (especially low-ESR ceramic
types) may slow transient response or degrade dynamic performance. Thoroughly test your system
with all components installed.
www.murata-ps.com/support
MDC_UHE_12-30W Series.D01
Page 5 of 16
嵌入式系统
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