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MYGTM01210BZN Application
1
DC-DC Converter Application Manual
MYGTM01210BZN
1. Features
・Single output/SIL/non-isolated type DC-DC converter with high power (120W).
・High efficiency and small size have been achieved.
・Wide input range(17.0V to 40.0V).
・Wide adjustable output voltage range by connecting external resistance (5.0V to 12.0V).
・Shield case type.
・ON/OFF function and Short-circuit protection function are built in.
2. Appearance, Dimensions
40.0 Max.
The tolerance not specified is ±0.3
(36.4)
(3.4)
29.2 Max.
40.3 Max.
36.8
15.5
29.8±0.5
(1.5)
3.2±0.5
(2.5)
□0.65±0.05
1 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・13
6.2
【Unit : mm】
Marking
(
1. Manufacturer Parts Number
MYGTM01210BZN
2. Manufacturer ID
MURATA
)…reference value
Lead Pitch : 2.5 ±0.3mm
Distance between the both roots of Pin.
Tolerance is not accumulated.
3. Trace code
□□□□□□
① ② ③ ④ ④ ④
① Production Factory ID
R : Kanazu Murata Mfg. Co.,Ltd.
② Production Year
③ Production Month (1,2,3, ……,9,O,N,D)
④ Production Lot No. (3 end digit of Production Lot)
Note:
1. This datasheet is downloaded from the website of Murata Manufacturing co., ltd. Therefore, it’ s specifications are subject to change or our
products in it may be discontinued without advance notice. Please check with our sales representatives or product engineers before ordering.
2. This datasheet has only typical specifications because there is no space for detailed specifications. Therefore, please approve our product
specifications or transact the approval sheet for product specifications before ordering.
2010.7.14
MYGTM01210BZN Application
2
Pin Number and Function
Pin No.
1,2,3
4
5,6,7,8,9
10,11,12
13
Symbol
Vin
ON/OFF
GND
Vout
VAR
Function
Input
Remote ON/OFF
GND
Output
Output Voltage Adjust
3. Block Diagram
1,2,3
Vout
Vin
VAR
5,6,7
10,11,12
13
8,9
GND
51.7kΩ
GND
Control Circuit
4
ON/OFF
47kΩ
4. Absolute Maximum Rating
Input Voltage +45V
No voltage, no matter how instantaneous, shall be applied beyond the absolute maximum voltage
rating to this product. If you apply any voltage over this limit the product characteristics will
deteriorate or the product itself will be destroyed. Even though it may continue operating for a
while after the over-voltage event, it’s life will likely be shortened significantly.
Reliability and life of the module may degrade similarly if the maximum operating voltage rating
is continuously exceeded.
This product is designed to operate within the maximum operating voltage rating specification.
5. Environmental Conditions
5.1
Operating Temperature Range
5.2
Storage Temperature Range
5.3
Operating Humidity Range
5.4
Storage Humidity Range
-10°C ~ +80°C
-20°C ~ +85°C
20% ~ 85% (No water condenses in any cases.)
10% ~ 90% (No water condenses in any cases.)
Note:
1. This datasheet is downloaded from the website of Murata Manufacturing co., ltd. Therefore, it’ s specifications are subject to change or our
products in it may be discontinued without advance notice. Please check with our sales representatives or product engineers before ordering.
2. This datasheet has only typical specifications because there is no space for detailed specifications. Therefore, please approve our product
specifications or transact the approval sheet for product specifications before ordering.
2010.7.14
MYGTM01210BZN Application
3
6. Characteristics
6. 1 Electrical Characteristics (Ta=25 oC)
Item
Input Voltage Range
Symbol
Vin
Output Voltage
Vout
Vin=17.0~40.0V,
Iout=0~10A
Value
Typ.
24.0
Max.
40.0
VAR=GND
11.64
12.00
12.36
VAR=Open
4.85
5.00
5.15
Unit
V
V
Output Current
Iout
Vin=17.0~40.0V, thermal derated
0
-
10.0
A
Ripple Voltage
Vrpl
Vin=24V, Iout=10A, BW = 20MHz,
-
100
-
mV(pp)
Efficiency
EFF
Vin =24V, Iout=10A, Vout=12V
97.3
-
%
VIH
OFF
Vin=17.0~40.0V
ON/OFF Voltage
VIL
!
Min.
17.0
Condition
2.5
ON
-
-
Open
0.5
10.5
-
-
V
Protection Output
Current
Iocp
Vin=17.0~40.0V
Short Circuit Protection
SCP
If output is shorted to GND, DC-DC Converter shall be operated in a hiccup mode.
After the short circuit event has cleared, the output is automatically brought back
into regulation.
A
Causion
The above electrical characteristics are guaranteed with the condition that the impedance of the input voltage source is
sufficiently low as shown in section 6. Connecting an input inductance or using an input power supply with output inductance
may cause an unstable operation of this device. Please check the proper operation of this device with the peripheral circuits on
your system.
6. 2 Thermal Dereting
Output current derating
100
90
Vin:17.0~40.0V
Output current [%]
80
70
60
50
40
30
20
10
0
-10
0
10
20
30
40
50
60
70
80
Ta [℃]
Note:
1. This datasheet is downloaded from the website of Murata Manufacturing co., ltd. Therefore, it’ s specifications are subject to change or our
products in it may be discontinued without advance notice. Please check with our sales representatives or product engineers before ordering.
2. This datasheet has only typical specifications because there is no space for detailed specifications. Therefore, please approve our product
specifications or transact the approval sheet for product specifications before ordering.
2010.7.14
MYGTM01210BZN Application
4
7. Pin Description
7.1. Adjusting the Output Voltage
The output voltage can be adjusted ranging from 5.0V to 12.0V by connecting resistors between VAR-pin(13pin) to GND-pin.
The following equation gives the required external-resistor values to adjust the output voltage to Vo-adj.
It is highly recommended that evaluation of the characteristics of this DC-DC converter’s operation under your board
conditions be thoroughly conducted.
MYGTM01210BZN
Vout
Internal Circuit
10kΩ
VAR pin
10 × 0.7
RVAR =
1.0kΩ
Vo-adj ―(
10
―1.0 [kΩ]
+1) ×0.7
1.627
Error amp
RVAR
1.627kΩ
<RVAR Calculation Example>
Vo-adj
[V]
12.0
9.0
7.0
5.0
Calculated
RVAR[kΩ]
0
0.751
2.504
-2921
RVAR Example
0Ω
750Ω
2.4kΩ + 100Ω
Open
7.2. ON/OFF Control
ON/OFF function
Using the ON/OFF feature, the operation of this product can be disabled without removal of the input voltage.
Sequencing of a power supply system and power-saving control can be easily achieved using this function.
ON/OFF Control Operation
When ON/OFF-pin(4pin) is connected to Vin
When ON/OFF-pin(4pin) is connected to GND or open
MYGTM01210BZN
example
4
or
ON/OFF
GND
……
……
Output Voltage =OFF
Output Voltage =ON
< Caution>
ON/OFF pin is pulled down inside of the DC-DC
converter, so voltage appears up to GND at
ON/OFF pin.
Note:
1. This datasheet is downloaded from the website of Murata Manufacturing co., ltd. Therefore, it’ s specifications are subject to change or our
products in it may be discontinued without advance notice. Please check with our sales representatives or product engineers before ordering.
2. This datasheet has only typical specifications because there is no space for detailed specifications. Therefore, please approve our product
specifications or transact the approval sheet for product specifications before ordering.
2010.7.14
MYGTM01210BZN Application
5
8. Test Circuit
8. 1 Test Circuit
Iin
Vin
A
DCIN
+
+
C1
C2
10,11,12
1,2,3
V
GND
V
5,6
4
ON/OFF
Iout
Vout
A
+
+
+
C3
C4
C5 C6
Vr
RL
7,8,9 GND
MYGTM01210BZN
13
VAR
C1,C2
: 1000µF/50V Low Impedance Aluminum Electrolytic Capacitor(ZL series : Rubycon)
C3,C4,C5 : 1000µF/16V Low Impedance Aluminum Electrolytic Capacitor
(EKZE160ETD102MJ20S :NIPPON CHEMI-CON)
C6
: 0.1F Ceramic Capacitor
Please make sure to place C1~C5 nearby input and output terminal of DC-DC converter.
8.2 Input/Output Aluminum Electrolytic Capacitor for full-wave rectifier (Reference)
*When input is AC24V±10% 50Hz or 60Hz full-wave rectifier, please refer following external circuit.
External circuit
Vin=24Vrms±15%
~
Vout
Vin
↑
MYGTM01210BZN VAR
C1
C2
C3
C4
○
C5
GND
C6
C7
C8
○
C1,C2,C3 : 1000F/50V Low Impedance Aluminum Electrolytic Capacitor (EKZE500EC3102ML25S
C4,C5
NIPPON CHEMI-CON)
C6,C7,C8 : 1000F/16V Low Impedance Aluminum Electrolytic Capacitor (EKZE160ETD102MJ20S
Note:
1. This datasheet is downloaded from the website of Murata Manufacturing co., ltd. Therefore, it’ s specifications are subject to change or our
products in it may be discontinued without advance notice. Please check with our sales representatives or product engineers before ordering.
2. This datasheet has only typical specifications because there is no space for detailed specifications. Therefore, please approve our product
specifications or transact the approval sheet for product specifications before ordering.
2010.7.14
MYGTM01210BZN Application
6
9. Typical Characteristics Data
9. 1 Static Electrical Characteristics
Vin=17V,24V,40V, Vout=5V
(Ta=25 oC, Cin=50ZL1000M*16×25 ×2, Cout= EKZE160ETD102MJ20S×3)
100
5.15
95
5.10
5.05
Efficiency [%]
Output Voltage [V]
90
5.00
4.95
Vin = 17V
Vin = 24V
Vin = 40V
4.90
85
80
75
Vin = 17V
70
Vin = 24V
Vin = 40V
65
4.85
60
0
1
2
3
4
5
6
7
8
9
10
Output Current [A]
0
1
2
3
4
5
6
7
8
9
10
Output Current [A]
Fig.9-1-1. Output Voltage v.s. Output Current
Fig.9-1-2. Efficiency v.s. Output Current
100
90
Vin = 17V
Vin = 24V
Vin = 40V
Ripple Voltage [mVp-p]
80
70
60
50
40
30
20
10
0
0
1
2
3
4
5
6
7
8
9
10
Output Current [A]
Fig.9-1-3. Ripple Voltage v.s. Output Current
Note:
1. This datasheet is downloaded from the website of Murata Manufacturing co., ltd. Therefore, it’ s specifications are subject to change or our
products in it may be discontinued without advance notice. Please check with our sales representatives or product engineers before ordering.
2. This datasheet has only typical specifications because there is no space for detailed specifications. Therefore, please approve our product
specifications or transact the approval sheet for product specifications before ordering.
2010.7.14
MYGTM01210BZN Application
7
Vin=17V,24V,40V, Vout=12V
(Ta=25 oC, Cin=50ZL1000M*16×25 ×2, Cout= EKZE160ETD102MJ20S×3)
100
12.36
95
12.24
Efficiency [%]
Output Voltage [V]
90
12.12
12.00
11.88
Vin = 17V
Vin = 24V
Vin = 40V
11.76
85
80
75
Vin = 17V
70
Vin = 24V
Vin = 40V
65
11.64
60
0
1
2
3
4
5
6
7
8
9
10
Output Current [A]
0
1
2
3
4
5
6
7
8
9
10
Output Current [A]
Fig.9-1-4. Output Voltage v.s. Output Current
Fig.9-1-5. Efficiency v.s. Output Current
100
90
Vin = 17V
Vin = 24V
Vin = 40V
Ripple Voltage [mVp-p]
80
70
60
50
40
30
20
10
0
0
1
2
3
4
5
6
7
8
9
10
Output Current [A]
Fig.9-1-6. Ripple Voltage v.s. Output Current
Note:
1. This datasheet is downloaded from the website of Murata Manufacturing co., ltd. Therefore, it’ s specifications are subject to change or our
products in it may be discontinued without advance notice. Please check with our sales representatives or product engineers before ordering.
2. This datasheet has only typical specifications because there is no space for detailed specifications. Therefore, please approve our product
specifications or transact the approval sheet for product specifications before ordering.
2010.7.14
MYGTM01210BZN Application
8
9. 2 Dynamic Electrical Characteristics
Vin=24V, Vout=5V
(Ta=25 oC, Cin=50ZL1000M*16×25 ×2, Cout= EKZE160ETD102MJ20S×3)
Vin(20V/div)
Vin(20V/div)
Vout(2V/div)
Vout(2V/div)
4ms/div
Fig.9-2-1. Start-up Waveform(Io=0A)
Vin(20V/div)
4ms/div
Fig.9-2-2. Start-up Waveform(Io=10A)
Vin(20V/div)
ON/OFF(20V/div)
ON/OFF(20V/div)
Vout(2V/div)
Vout(2V/div)
4ms/div
4ms/div
Fig.9-2-3. Start-up Waveform(Io=0A)
Fig.9-2-4. Start-up Waveform(Io=10A)
Vout(200mV/div)
Vout(200mV/div)
Iout(10A/div)
Iout(10A/div)
400us/div
400us/div
Fig.9-2-5. Load Transient Response
(Io=0 → 10A)
Fig.9-2-6. Load Transient Response
(Io=10A → 0A)
Note:
1. This datasheet is downloaded from the website of Murata Manufacturing co., ltd. Therefore, it’ s specifications are subject to change or our
products in it may be discontinued without advance notice. Please check with our sales representatives or product engineers before ordering.
2. This datasheet has only typical specifications because there is no space for detailed specifications. Therefore, please approve our product
specifications or transact the approval sheet for product specifications before ordering.
2010.7.14
MYGTM01210BZN Application
9
Vin=24V, Vout=12V
(Ta=25 oC, Cin=50ZL1000M*16×25 ×2, Cout= EKZE160ETD102MJ20S×3)
Vin(20V/div)
Vin(20V/div)
Vout(5V/div)
Vout(5V/div)
4ms/div
Fig.9-2-7. Start-up Waveform(Io=0A)
Vin(20V/div)
4ms/div
Fig.9-2-8. Start-up Waveform(Io=10A)
Vin(20V/div)
ON/OFF(20V/div)
ON/OFF(20V/div)
Vout(5V/div)
Vout(5V/div)
4ms/div
4ms/div
Fig.9-2-9. Start-up Waveform(Io=0A)
Fig.9-2-10. Start-up Waveform(Io=10A)
Vout(200mV/div)
Vout(200mV/div)
Iout(10A/div)
Iout(10A/div)
400us/div
400us/div
Fig.9-2-11. Load Transient Response
(Io=0 → 10A)
Fig.9-2-12. Load Transient Response
(Io=10A → 0A)
Note:
1. This datasheet is downloaded from the website of Murata Manufacturing co., ltd. Therefore, it’ s specifications are subject to change or our
products in it may be discontinued without advance notice. Please check with our sales representatives or product engineers before ordering.
2. This datasheet has only typical specifications because there is no space for detailed specifications. Therefore, please approve our product
specifications or transact the approval sheet for product specifications before ordering.
2010.7.14
MYGTM01210BZN Application
10
10. Pattern Layout
10. 1 Foot Print Dimensions
φ2.0
6.75
Hole D
21.20
12-2.5
+0.10
-0.00
3-φ1.00
5-φ0.95
+0.10
-0.00
14.30
14.30
5-φ0.95
+0.10
-0.00
29.55
Hole A
R0.85
4.1
R0.85
4.1
R0.85
Hole C
1.7
3.45
R0.85
1.7
33.45
Hole B
Top View
Unit【mm】
φ2.0
10. 2 Patterning Area
Metal case is connected to GND. So hole A,B,C and D should be connected to GND.
The Area indicated
is allowed no pattern or only GND pattern.
2.0
Hole B and D
8.0
Hole A and C
7.0
2.0
Note:
1. This datasheet is downloaded from the website of Murata Manufacturing co., ltd. Therefore, it’ s specifications are subject to change or our
products in it may be discontinued without advance notice. Please check with our sales representatives or product engineers before ordering.
2. This datasheet has only typical specifications because there is no space for detailed specifications. Therefore, please approve our product
specifications or transact the approval sheet for product specifications before ordering.
2010.7.14
MYGTM01210BZN Application
11
11. Notice
11.1 Soldering
11.1.1 Flux
Please solder the products with no-cleaning type Rosin Flux which leaves little residue and low
activity . Do not use cleaning type flax, in case that you wash the products after using cleaning
type flux, they may damage mounting parts on the products and may cause defective or low
quality products.
11. 1.2 Solder
Please recommend use of the solder Sn-3Ag-0.5Cu.
When use other solders, use it after examining at customer.
11. 1.3 Condition of soldering
Please solder under the following condition.
・ Flow soldering Preheating
: 120±10ooC 60~120 seconds
Soldering
: 255±5 C
Time within
: 10 seconds
・ Condition of iron soldering
: under 380 oC, 4 seconds at maximum
(Only iron less than 30W should be used.)
11. 2 Cleaning
Please do not wash the products.
Note:
1. This datasheet is downloaded from the website of Murata Manufacturing co., ltd. Therefore, it’ s specifications are subject to change or our
products in it may be discontinued without advance notice. Please check with our sales representatives or product engineers before ordering.
2. This datasheet has only typical specifications because there is no space for detailed specifications. Therefore, please approve our product
specifications or transact the approval sheet for product specifications before ordering.
2010.7.14
MYGTM01210BZN Application
12
12. Packaging Specification
12.1. Packing Form
These are packed in a tray(See Fig.12-1)
12.2. The number of products in pack specification form.
35pcs./tray
If the products have fraction, may not follow this specification.
12.3.Packaging Form
12.3.1. Case of reuseable box is used.
These trayies packed products are packaging for Fig.12-2.
12.3.2. Case of reuseable box is not used
These trayies packed products are packaging for Fig.12-3.
(411)
Direction of
Products
Fig.12-1
(275)
Note:
1. This datasheet is downloaded from the website of Murata Manufacturing co., ltd. Therefore, it’ s specifications are subject to change or our
products in it may be discontinued without advance notice. Please check with our sales representatives or product engineers before ordering.
2. This datasheet has only typical specifications because there is no space for detailed specifications. Therefore, please approve our product
specifications or transact the approval sheet for product specifications before ordering.
2010.7.14
MYGTM01210BZN Application
13
As in Figure 2, six traies are packed up in the outside packing box .(Number of packed traies is 5 and Empty
traies is 1)
When there is a fraction, packing up the empty tray. (Number of all traies is allways 6.)
Then, traies piles up alternately.
Air cap
Empty tray
Product packed tray
Buffer material
Buffer material
Outside packing box
Buffer material
Outside packing box
Tray
Fig.12-2
Note:
1. This datasheet is downloaded from the website of Murata Manufacturing co., ltd. Therefore, it’ s specifications are subject to change or our
products in it may be discontinued without advance notice. Please check with our sales representatives or product engineers before ordering.
2. This datasheet has only typical specifications because there is no space for detailed specifications. Therefore, please approve our product
specifications or transact the approval sheet for product specifications before ordering.
2010.7.14
MYGTM01210BZN Application
14
As in Figure 2, six traies fixed by banding band are packed up in the corrugated fiberboard box.
(Number of packed traies is 5 and Empty traies is 1.)
When there is a fraction, fixed the empty trais by banding band. (Number of all traies is allways 6.)
Then, traies piles up alternately.
Banding band
Tyay
Top view
Empty tyay
Product packed tray
Side view
Corrugated fiberboard mount Fixed Tray
Corrugated fiberboard box
Fig.12-3
Note:
1. This datasheet is downloaded from the website of Murata Manufacturing co., ltd. Therefore, it’ s specifications are subject to change or our
products in it may be discontinued without advance notice. Please check with our sales representatives or product engineers before ordering.
2. This datasheet has only typical specifications because there is no space for detailed specifications. Therefore, please approve our product
specifications or transact the approval sheet for product specifications before ordering.
2010.7.14
MYGTM01210BZN Application
15
Item
Specification
Packaging form typical classification
Dimensions of packaging form
(typ.)
Box
Case of reuseable box is
used.
W =
538 ( mm )
D =
368 ( mm )
H =
284 ( mm )
H
D
W
Case of reuseable box is
not used
W =
432 ( mm )
D =
296 ( mm )
H =
264 ( mm )
The number of products in packaging form
175( p c s )
Mass of one product
45( g ) Typ.
Remark
If the products have fraction, may not follow this specification.
※On the Packing case, the following is indicated.
Murata Parts No.
Quantity
Stamp No.
Note:
1. This datasheet is downloaded from the website of Murata Manufacturing co., ltd. Therefore, it’ s specifications are subject to change or our
products in it may be discontinued without advance notice. Please check with our sales representatives or product engineers before ordering.
2. This datasheet has only typical specifications because there is no space for detailed specifications. Therefore, please approve our product
specifications or transact the approval sheet for product specifications before ordering.
2010.7.14
MYGTM01210BZN Application
16
13. !
Notice
13.1. Input / Output capacitor
When a inductance or a switch devise are connected to the input line, or when you use a power supply with
output inductance as the input voltage source, the input voltage of the DC-DC converter will be fluctuated.
By this input voltage fluctuation, the transient load response of the DC-DC converter may be deteriorated or
abnormal oscillation may occur. So please confirm normal operation on each application.
Please use external input capacitor in order to decrease inductance of input line.
In case you use external output capacitor in order to improve transient load response, please use input
capacitor to prevent abnormal oscillation. When you use external capacitors, following capacitors are
recommendable.
Output capacitor (C3+C4+C5+C6) : Please use capacitors lesss than 4500μF
13.2. Wiring of input / output capacitor
In the case of input / output capacitor connection, in order to reduce electrical noise, please design PCBs
with consideration of the following item.
①.Please be sure to check normal operation on your system.
②.Please use low impedance capacitors with good high frequency characteristic.
③.Please shorten those leads of each capacitor as much as possible, and make sure the lead
Inductance low.
④.Both input-side and output side, please make the wiring loop between plus and minus as small as
possible.The influence of leakage inductance can be reduced.
⑤.Please design the print pattern of the main circuit as wide and short as possible.
Make wiring roop small
Make wiring roop small
+Vin
+Vin
+Vout
+Vout
DC-DC
Converter
+Vin
Load
-Vin
GND
C1
C2
shorten the leads and pattern
shorten the leads and pattern
13.3. This product should not be operated in parallel or in series.
13.4. Please do not use a connector or a socket to connect this product to your product.
The electric characteristics may be deteriorated by the influence of contact resistance.
13.5. Be sure to provide an appropriate fail-safe function on your product to prevent secondary damage
that may be caused due to abnormal functional or failure of this product.
13.6. Inrush current protection is not a feature of this product.
13.7. Please connect the input terminals with the correct polarity. If an error in polarity connection is made this
product may be damaged. If this product is damaged internally, an elevated input current may flow, and so
this product may exhibit an abnormal temperature rise, or your product may be damaged.
Please add a diode and fuse per the following diagram to protect them.
fuse
+
+
+
diode
IN
-
OUT
Load
-
Standard of fuse : current rating 15A
※Please select diode and fuse after confirming the operation of your product.
Note:
1. This datasheet is downloaded from the website of Murata Manufacturing co., ltd. Therefore, it’ s specifications are subject to change or our
products in it may be discontinued without advance notice. Please check with our sales representatives or product engineers before ordering.
2. This datasheet has only typical specifications because there is no space for detailed specifications. Therefore, please approve our product
specifications or transact the approval sheet for product specifications before ordering.
2010.7.14
MYGTM01210BZN Application
17
Note
1.Please contact our main sales office or nearby sales office before using our products for the applications
listed below which require especially high reliability for the prevention of defects which might directly
cause damage to the third party’s life, body or property or this products for any other applications that
described in the above.
!
①Aircraft equipment
②Aerospace equipment
③Undersea equipment
④Power plant control equipment
⑤Medical equipment
⑥Transportation equipment (vehicles, trains, ships, etc.)
⑦Traffic signal equipment
⑧Disaster prevention /crime prevention equipment
⑨Data-processing equipment
⑩Application of similar complexity and/or reliability requirements to the applications listed in the above.
2.This catalog is indicated in July 2010. About the written contents, since changing without a preliminary
announcement for improvement and supply are sometimes stopped, please confirm in case of ordering.
If written contents are unknown, please ask to our main sales office or nearby sales office.
3.Types and specification in this catalog are referenced for your information only. Please confirm detailed
specifications by approving our individual drawing and specification sheet.
Note:
1. This datasheet is downloaded from the website of Murata Manufacturing co., ltd. Therefore, it’ s specifications are subject to change or our
products in it may be discontinued without advance notice. Please check with our sales representatives or product engineers before ordering.
2. This datasheet has only typical specifications because there is no space for detailed specifications. Therefore, please approve our product
specifications or transact the approval sheet for product specifications before ordering.
2010.7.14
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