R1200K004A-TR [RICOH]
Switching Regulator, 1A, 1400kHz Switching Freq-Max, CMOS, PDSO6, 1.80 X 2 MM, DFN-6;
| 型号： | R1200K004A-TR |
| 厂家： | 
RICOH ELECTRONICS DEVICES DIVISION |
| 描述： | Switching Regulator, 1A, 1400kHz Switching Freq-Max, CMOS, PDSO6, 1.80 X 2 MM, DFN-6 开关 光电二极管 |
| 文件： | 总16页 (文件大小：338K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
R1200x Series
Step-up DC/DC converter
OUTLINE
NO. EA-192-081219
R1200 series are CMOS-based control type step-up DC/DC converter with low supply current ICs. Each of
these ICs consists of a Nch MOSFET, NPN transistor, an oscillator, PWM comparator, a voltage reference unit,
an error amplifier, a current limit circuit, an under voltage lockout circuit (UVLO), an over voltage protection
circuit (OVP), a soft start circuit, and so on. As the external components, an inductor, resistances or
capacitors are necessary to make a constant output voltage of step-up DC/DC converter with the R1200. At
standby mode, the NPN transistor can separate the output from the input. During the situation of that, there
are two versions. R1200xxxA: the output of VOUT is generated to 0V by the low resistance (with the
auto-discharge function). R1200xxxxB does not generate the output of VOUT (without the auto-discharge
function).
The soft-start time (Typ.1.5ms) and the maximum duty cycle (Typ.91%) are set internally. For the protection
functions of R1200 series are the current limit function of the LX peak current, the OVP function for detection
the over voltage of output and the UVLO function for protective miss-operation by the low voltage. (The
threshold of OVP is selectable from 17V, 19V, 21V or 23V)
The package are SOT-23-6 (standard type) and DFN(PLP)1820-6(tiny type)
FEATURES
zꢀOperating Voltage Range.............................................2.3V ~ 5.5V
zꢀ400mA, 1.5Ω, 23V Built-in Nch MOSTET
zꢀBuilt-in a rectifier NPN transistor, at standby mode, complete shutdown is possible
zꢀWith VOUT auto-discharge function (R1200xxxxA)/without (R1200xxxxB) can be selected
zꢀHigh Frequency PWM control......................................Oscillator Frequency 1.2MHz
zꢀMaximum Duty Cycle ...................................................Typ.91%
zꢀLow Feedback Voltage.................................................1.0V
zꢀSetting Output Voltage can be set by external resistance
zꢀUVLO Threshold Voltage .............................................Typ.2.0V (Hysteresis Typ.0.1V)
zꢀLX Current Limit Protection...........................................Typ.700mA
zꢀOver Voltage Protection (OVP) Threshold...................can be selected from below;
R1200x001x: Typ. 17V
R1200x002x: Typ. 19V
R1200x003x: Typ. 21V
R1200x004x: Typ. 23V
zꢀPackage .......................................................................SOT23-6, DFN(PLP)1820-6
APPLICATION
zꢀOLED power supply for portable equipment
1
R1200x
BLOCK DIAGRAMS
zꢀR1200xxxxA
VFB
VIN
LX
VOUT
UVLO
Err. Amp.
PWM Comp.
+
+
R
Q
Switch
Control
S
–
ref
OVP
CE
Soft-start
Slope
Current
Protect
Current
Sense
Compensation
∑
GND
LX
CE
zꢀR1200xxxxB
VFB
VIN
VOUT
UVLO
Err. Amp.
PWM Comp.
+
–
+
R
Q
Switch
Control
S
–
Vref
OVP
CE
Oscillator
Soft-start
Slope
Current
Sense
Current
Protect
Compensation
∑
GND
CE
2
R1200x
SELECTION GUIDE
The OVP threshold voltage and the package for the ICs can be selected at the user’s request. The selection
can be available by designating the part Number as shown below;
R1200 x xxx x-TR ←Part Number
↑
↑
↑
↑
a
b
c
d
Cord
a
Descriptions
Designation of the package type:
K: DFN(PLP)1820-6
N: SOT23-6
Designation of OVP threshold type:
001: 17V threshold of OVP
002: 19V threshold of OVP
003: 21V threshold of OVP
004: 23V threshold of OVP
b
Designation of with/without VOUT auto-discharge function type:
A: with auto-discharge
c
B: without auto-discharge
Designation of taping type:
TR (refer to Taping Specifications)
d
PIN CONFIGURATIONS
DFN(PLP)1820-6
SOT23-6
6
5
4
6
5
4
VOUT VIN GND
VFB
GND
LX
CE
VOUT
VIN
CE
1
VFB
2
LX
3
1
2
3
3
R1200x
PIN DESCRIPTION
R1200K: DFN(PLP)1820-6
Pin No.
Symbol
CE
Description
1
2
3
4
5
6
Chip Enable Pin
Feedback Pin
VFB
LX
GND
VIN
VOUT
Switching Pin (Open Drain Output)
Ground Pin
Power Supply Input Pin
Output Pin
Tab is GND level. (They are connected to the reverse side of this IC.)
Do not connected to other wires or land patterns.
R1200N: SOT23-6
Pin No.
Symbol
CE
VOUT
VIN
LX
GND
Description
1
2
3
4
5
6
Chip Enable Pin
Output Pin
Power Supply Input Pin
Switching Pin (Open Drain Output)
Ground Pin
VFB
Feedback Pin
ABSOLUTE MAXIMUM RATINGS
(GND=0V)
Symbol
VIN
Item
VIN Pin Voltage
Ratings
6.5
Unit
V
VCE
VFB
VOUT
VLX
ILX
CE Pin Voltage
VFB Pin Voltage
VOUT Pin Voltage
LX Pin Voltage
LX Pin Voltage
-0.3~VIN+0.3V
-0.3~VIN+0.3V
-0.3~25.0
-0.3~25.0
1000
V
V
V
V
mA
DFN(PLP)1820-6
SOT23-6
880
420
PD
Power Dissipation *
mW
Ta
Tstg
Ambient Temperature Range
Storage Temperature Range
-40~+85
-55~+125
°C
°C
* For Power Dissipation, please refer to PACKAGE INFORMATION to be described.
ABSOLUTE MAXIMUM RATINGS
Electronic and mechanical stress momentarily exceeded absolute maximum ratings may cause the permanent
damages and may degrade the life time and safety for both device and system using the device in the field. The
functional operation at or over these absolute maximum ratings is not assured.
4
R1200x
ELECTRICAL CAHRACTERISTICS
TꢀVIN SECTION
(Ta=25ºC)
Symbol
VIN
Item
Conditions
MIN.
TYP.
MAX.
5.5
Unit
Operating Input Voltage
Supply Current
2.3
V
IIN
VIN=5.5V, VFB=0V, LX No-Load
VIN=5.5V, VCE=0V
VIN falling
0.5
0
1.0
mA
µA
V
Istandby
Standby Current
UVLO Detector Threshold
3.0
2.1
VUVLO
VUVLO
1
2
1.9
2.0
VUVLO
1
UVLO Released Voltage
VIN rising
2.25
V
+0.10
TꢀCE SECITON
Symbol
Item
Conditions
VIN=5.5V
MIN.
TYP.
MAX.
Unit
V
VCEH
VCEL
RCE
CE ”H” Input Voltage
CE ”L” Input Voltage
CE pull-down Resistance
1.5
VIN=2.3V
0.5
2200
V
VIN=3.6V
600
1200
kꢀ
TꢀFB SECTION
Symbol
Item
Conditions
VIN=3.6V
MIN.
TYP.
MAX.
Unit
V
VFB
∆VFB
/∆Ta
IFB
VFB Voltage Tolerance
VFB Voltage
0.985
1.0
1.015
VIN=3.6V,
ppm
±150
<
<
Temperature Coefficient
VFB Input Current
Soft-start Time
-40ºC Ta 85ºC
= =
/ºC
VIN=5.5V, VFB=0V or 5.5V
VIN=3.6V
-0.1
0.1
µA
tSS
1.5
ms
TꢀNch-SWITCHI & DIODE SECTION
Symbol
RON
Item
Conditions
MIN.
TYP.
1.35
0
700
0.8
MAX.
Unit
ꢀ
µA
mA
V
µA
µA
Switch ON Resistance
Switch Leakage Current
Switch Current Limit
NPN VCE Voltage
VIN=3.6V, ISW=100mA
IOFF
3.0
1000
ILIM
VIN=3.6V
400
VNPN
INPNOFF
INPN=100mA
VOUT=23V
VOUT=0V, VLX=5.5V
1
2
NPN Leakage Current 1
NPN Leakage Current 2
10
3.0
INPNOFF
TꢀOSCILLATOR & PWM SECTION
Symbol
fosc
Item
Conditions
VIN=3.6V, VOUT=VFB=0V
VIN=3.6V, VOUT=VFB=0V
MIN.
1000
86
TYP.
1200
91
MAX.
Unit
kHz
%
Oscillator Frequency
Maximum Duty Cycle
1400
Maxduty
TꢀOUTPUT SECTION
Symbol
Item
Conditions
MIN.
16
TYP.
17
MAX.
18
Unit
R1200x001x
VIN =3.6V
OUT rising
R1200x002x
R1200x003x
R1200x004x
18
19
20
VOVP1
OVP Detector Threshold
V
V
20
22
21
22
24
23
VOVP
1
VOVP2
OVP Released Voltage
VIN =3.6V, VOUT falling
VIN =3.6V
V
-1.1
0.7
6.0
IDISCHG
IVOUT
VOUT Discharge Current
OVP Sense Current
R1200xxxxA
mA
VOUT=0.1V
VIN =3.6V, VOUT=23V
µA
RECOMMENDED OPERATING CONDITIONS (ELECTRICAL CHARACTERISTICS)
All of electronic equipment should be designed that the mounted semiconductor devices operate within the
recommended operating conditions. The semiconductor devices cannot operate normally over the recommended operating
conditions, even if when they are used over such conditions by momentary electronic noise or surge. And the
semiconductor devices may receive serious damage when they continue to operate over the recommended operating
conditions.
5
R1200x
TYPICAL APPLICATION AND TECHNICAL NOTES
L1
22µH
C1
L1
C1
LQH32CN220K53L (Murata)
1µF
1µF
LX
VIN
CE
C2 GRM21BR11E105K (Murata)
C3 220pF
R1 For VOUT setting
R2 For VOUT setting
R3 2kΩ
VOUT
C3
R3
C2
R2
R1
1µF
VFB
GND
Fig.1
zꢀThe Method of Output Voltage Setting
▪ The output voltage can be calculated with divider resisters (R1 and R2) values as the following formula:
Output Voltage=VFB x (R1+R2)/R1
▪ The total value of R1 and R2 should be equal or less than 300kΩ. Make the VIN and GND line sufficient.
The large current flows through the VIN and GND line due to the switching. If this impedance (VIN and
GND line) is high, the internal voltage of the IC may shift by the switching current, and the operating may
become unstable. Moreover, when the built-in LX switch is turn OFF, the spike noise caused by the
inductor may be generated. As a result of this, recommendation voltage rating of capacitor (C2) value is
equal 1.5 times larger or more than the setting output voltage.
zꢀShutdown
▪ At standby mode, the output is completely separated from the input and shutdown by the NPN
transistor of internal IC. However, the leakage current is generated when the LX pin voltage is equal or
more than VIN pin voltage at standby mode.
▪ R1200xxxxA (with auto-discharge function): In the term of standby mode, the switch is turned ON
between VOUT to GND and the VOUT capacitor is discharged.
▪ R1200xxxxB (without auto-discharge function): The built-in switch for discharge does not turn on, but
the OVP sense resisters between VOUT and GND exists as same as A version.
▪ However, the both version (A/B) has the OVP sense resistance (4-5MegaΩ) between VOUT and GND
(refer to OVP sense current [IVOUT] on ELECTRICAL CHARACTERISTICS table) and the current flows
through from VOUT to GND.
zꢀSelection of external components
▪ The recommendation of capacitor value for C1 is in the range from 1µF to 4.7µF. Connect C1 with a
capacitance value between VDD and GND pin, and as close as possible to the pins.
▪ Connect a capacitor in the range from 1µF to 4.7µF between VOUT and GND pins.
▪ The recommendation of inductance value is in the range from 4.7µH - 22µH. Choose an inductor of
which the DC resistance is small enough and the permissible current is large enough and be hard for
magnetic saturation. If the inductance value is too small, at the maximum load the peak current may be
large and reach the current limit of LX.(Refer to the item of the operation of the DC/DC converter and
output current)
ÌThe performance of power source circuits using these ICs extremely depends upon the peripheral
circuits. Pay attention in the selection of the peripheral circuits. In particular, design the peripheral circuits
in a way that the values such as voltage, current, and power of each component, PCB patterns and the IC
do not exceed their respected rated values.
6
R1200x
OPERATION OF STEP-UP DC/DC CONVERTER AND OUTPUT CURRENT
<Basic Circuit>
IL2
Inductor
IL1
Diode
Lx Tr
IOUT
VOUT
CL
VIN
<Current through L>
IL
Discontinuous Mode
ILXmax
Continuous Mode
ILXmax
IL
ILXmin
ILxmin
tf
t
t
tOFF
tON
t=1/fosc
tOFF
tON
t=1/fosc
There are two operation modes of the step-up PWM control-switching regulator. That is the
continuous mode and discontinuous mode by the continuousness inductor.
When the transistor turns ON, the voltage of inductor L becomes equal to VIN voltage. The increase
value of inductor current (IL1) will be
∆IL1 = VIN x tON / L ................................................................................................Formula 1
As the step-up circuit, during the OFF time (when the transistor turns OFF) the voltage is continually
supply from the power supply. The decrease value of inductor current (IL2) will be
∆IL2 = (VOUT-VIN) x tf / L .......................................................................................Formula 2
At the PWM control-method, the inductor current become continuously when tf = tOFF, the switching
regulator operate as the continuous mode.
In the continuous mode, the variation of current of IL1 and IL2 is same at regular condition.
VIN x tON / L = (VOUT-VIN) x tOFF / L.........................................................................Formula 3
The duty at continuous mode will be
DUTY = tON / (tON + tOFF) = (VOUT-VIN) / VOUT.........................................................Formula 4
7
R1200x
The average value of inductor current (IL1) when tf = tOFF will be
IL1(Ave.) = VIN x tON / (2 x L) ...................................................................................Formula 5
If the input voltage is equal to the output voltage, it becomes the continuous mode if the IOUT value is
larger than the value will be calculated by following formula.
I
OUT = VIN2 x tON / (2 x L x VOUT)................................................................................Formula 6
The peak current (ILXmax) of inductor will be
ILXmax = IOUT x VOUT / VIN + VIN x tON / (2 x L)
ILXmax = IOUT x VOUT / VIN + VIN x t x (VOUT-VIN) / (2 x L x VOUT)...............................Formula 7
The peak current value is larger than the IOUT value. In case of this, selecting the condition of the
input and the output and the external components by considering of ILXmax value.
The explanation above is based on the ideal calculation, and the loss caused by LX switch and the
external components are not included.
The actual maximum output current will be between 50% and 80% by the above calculations.
Especially, when the IL is large or VIN is low, the loss of VIN is generated with on resistance of the
switch.
8
R1200x
TYPICAL CHARACTERISTICS
1) Output Voltage vs. Output Current
R1200xxxxx
(L=22uH : Set-Vout=4.9V)
5.05
R1200xxxxx
(L=22uH : Set-Vout =9V)
9.3
9.2
9.1
9
VIN=2.8V
5
4.95
4.9
VIN=3.6V
VIN=4.2V
VIN=2.8V
VIN=3.6V
VIN=4.2V
VIN=5.0V
8.9
8.8
8.7
4.85
4.8
4.75
0
40
80
120
160
0
50
100
150
200
250
Output current [mA]
Output current [mA]
R1200xxxxx
R1200xxxxx
(L=22uH : Set-Vout=18V)
(L=22uH : Set-Vout=15V)
VIN=2.8V
15.5
15.25
15
18.6
VIN=2.8V
VIN=3.6V
VIN=4.2V
VIN=5.0V
VIN=3.6V
VIN=4.2V
VIN=5.0V
18.3
18
14.75
14.5
17.7
17.4
0
20
40
60
80
100
0
20
40
60
80
Output current [mA]
Output current [mA]
9
R1200x
2) Efficiency vs. Output Current
Inductor L Value Dependence
Inductor Typ Name Dependence
R1200xxxx
(VIN=3.6V Set-Vout=15V)
R1200xxxx
(VIN=3.6V Set-Vout=15V)
90
80
70
60
50
40
30
20
10
0
90
80
70
60
50
40
LQH32CN100K53 (10uH)
30
20
10
0
LQH32CN220K53 (22uH)
LQH32CN100K53 (10uH)
LQH32CN4R7M53 (4.7uF)
VLF3010AT-100 (10uH)
VLS252010T-100 (10uH)
LQH2MCN100K12 (10uH)
0
20
40
60
80
0
20
40
Output current[mA]
60
80
Output Current [mA]
Efficiency vs Output Current
(L=22uH : Set-Vout=4.9V)
Efficiency vs Output Current
(L=22uH : Set-Vout=9V)
90
90
80
70
60
50
40
30
20
10
0
80
70
60
50
40
30
20
10
0
VIN=2.8V
VIN=2.8V
VIN=3.6V
VIN=4.2V
VIN=3.6V
VIN=4.2V
VIN=5.0V
0
50
100
150
200
250
0
40
80
120
160
Output Current [mA]
Output Current [mA]
Efficiency vs Output Current
(L=22uH : Set-Vout=18V)
Efficiency vs Output Current
(L=22uH : Set-Vout=15V)
90
80
70
60
50
40
30
20
10
0
90
80
70
60
50
40
30
20
10
0
VIN=2.8V
VIN=3.6V
VIN=4.2V
VIN=5.0V
VIN=2.8V
VIN=3.6V
VIN=4.2V
VIN=5.0V
0
10
20
30
40
50
60
70
80
90
100
0
10
20
30
40
50
60
70
80
Output Current [mA]
Output Current [mA]
10
R1200x
3)Temperature
<OVP Sense Current>
<Supply Current>
R1200xxxxx
R1200xxxxx
VOUT=23V
VIN=5.5V
1200
6
R1200x001x
5
1000
R1200x004x
800
4
3
2
1
0
600
400
200
0
-50
-25
0
25
50
50
50
75
100
-50
-25
0
25
Ta [
50
75
100
Ta [
]
]
℃
℃
<CE Pulldown Resistance>
<CE"L"Input Voltage>
R1200xxxxx
R1200xxxxx
VIN=3.6V
VIN=1.8V
1800
1600
1400
1200
1000
800
600
400
200
0
1.3
1.1
0.9
0.7
0.5
0.3
-50
-25
0
25
Ta [
75
100
-50
-25
0
25
Ta [
50
75
100
]
]
℃
℃
<
>
<CE"H"Input Voltage>
NPN Vce Voltage
R1200xxxxx
R1200xxxxx
VIN=5.5V
IE=100mA
1.8
1.6
1.4
1.2
1
1.4
1.2
1.0
0.8
0.6
0.4
0.8
0.6
0.4
0.2
-50
-25
0
25
Ta [
75
100
-50
-25
0
25
Ta [
50
75
100
]
]
℃
℃
11
R1200x
<VFB Voltage>
<UVLO Detector Threshold Voltage/Return Voltage>
R1200xxxxx
R1200xxxxx
VIN=3.6V
1.010
1.005
1.000
0.995
0.990
0.985
0.980
0.975
0.970
2.4
2.2
2.0
1.8
1.6
UVLO Release
UVLO Detect
-50
-25
0
25
Ta [
50
75
100
-50
-25
0
25
50
75
100
]
Ta [
]
℃
℃
<Oscillator Frequency>
<MaxDuty>
R1200xxxxx
R1200xxxxx
VIN=3.6V
VIN=3.6V
94
93
92
91
1400
1350
1300
1250
1200
1150
1100
1050
1000
90
-50
-25
0
25
Ta [
50
75
100
-50
-25
0
25
Ta [
50
75
100
]
℃
]
℃
<OVP Detector Threshold Voltage /Released Voltage>
<OVP Detector Threshold Voltage /Released Voltage>
R1200x001x
R1200x004x
VIN=3.6V
VIN=3.6V
24.0
18.0
23.5
17.5
OVP Release
OVP Release
23.0
22.5
22.0
17.0
16.5
16.0
OVP Detect
OVP Detect
15.5
15.0
21.5
21.0
-50
-25
0
25
50
75
100
-50
-25
0
25
50
75
100
Ta [
]
℃
Ta [
]
℃
12
R1200x
<Soft-Start Time>
<VOUT Discharge Current>
R1200xxxxx
R1200xxxxA
VIN=3.6V
VIN=3.6V
1500
1400
1300
1200
1100
1000
900
800
700
600
500
1.5
1.2
0.9
0.6
0.3
0
-50
-25
0
25
Ta [
50
75
100
-50
-25
0
25
Ta [
50
75
100
]
]
℃
℃
<Switch Limit Current>
<Switch ON Resistance>
R1200xxxxx
R1200xxxxx
VIN=3.6V
VIN=3.6V
1200
1000
800
600
400
200
0
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
-50
-25
0
25
Ta [
50
75
100
-50
-25
0
25
Ta [
50
75
100
]
]
℃
℃
4)Load Response
R1200xxxxx Load Transient Response
set-Vout = 15.0V
VIN = 3.6V, IOUT =5mA→25mA
R1200xxxxx Load Transient Response
set-Vout = 5.0V
VIN = 3.6V, IOUT =5mA→25mA
100
80
60
40
20
0
5.20
5.10
5.00
4.90
4.80
4.70
100
80
60
40
20
0
16.0
15.5
15.0
14.5
14.0
13.5
Output current
Output voltage
Output current
Output voltage
0
1
2
3
4
5
0
1
2
3
4
5
Time [ms]
Time [ms]
13
R1200x
5)Start-up/Shut-down Waveform
R1200x004A Shutdow n Waveform
set-Vout = 5.0V
R1200x004A Startup Waveform
set-Vout = 5.0V
VOUT
CE
VOUT
CE
VIN = 3.6V, IOUT = 20mA
VIN = 3.6V, IOUT = 20mA
6.0
4.0
2.0
0
6.0
4.0
2.0
0
4
2
0
4
2
0
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5
0
0.5
1
1.5
2
2.5
3
3.5
Time [ms]
Time [ms]
R1200x004A Startup Waveform
set-Vout = 15.0V
R1200x004A Shutdow n Waveform
set-Vout = 15.0V
VOUT
CE
VOUT
CE
VIN = 3.6V, IOUT = 20mA
VIN = 3.6V, IOUT = 20mA
18.0
15.0
12.0
9.0
6.0
3.0
0
18
15
12
9
6
3
0
4
2
0
4
2
0
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5
0
0.5
1
1.5
2
2.5
3
3.5
Time [ms]
Time [ms]
6)R1200 OVP Waveform
Output voltage
CE
R1200x001A OVP Waveform
VFB = 0V
R1200x004A OVP Waveform
VFB = 0V
Output voltage
CE
30
25
20
15
10
5
20
15
10
5
0
0
4
4
2
0
2
0
-2
-2
-30 -20 -10
0
10 20 30 40 50 60 70
time [ms]
-30 -20 -10
0
10 20 30 40 50 60 70
time [ms]
14
PACKAGE INFORMATION
POWER DISSIPATION (DFN(PLP)1820-6)
This specification is at mounted on board. Power Dissipation (PD) depends on conditions of mounting on
board. This specification is based on the measurement at the condition below:
Measurement Conditions
Standard Test Land Pattern
Environment
Board Material
Board Dimensions
Copper Ratio
Mounting on Board (Wind velocity=0m/s)
Glass cloth epoxy plastic (Double sided)
40mm * 40mm * 1.6mm
Top side: Approx. 50%, Back side: Approx. 50%
φ 0.54mm * 30pcs
Through-holes
Measurement Result
(Ta=25°C, Tjmax=125°C)
Standard Test Land Pattern
880mW
Power Dissipation
Thermal Resistance
θja = (125-25°C) / 0.88W= 114°C/W
40
1200
1000
880
800
600
400
200
0
On Board
85
0
25
50
75
100
125 150
Measurent Board Pattern
Ambient Temperature (°C)
IC Mount Area Unit : mm
Power Dissipation
15
PACKAGE INFORMATION
POWER DISSIPATION (SOT-23-6)
This specification is at mounted on board. Power Dissipation (PD) depends on conditions of mounting on board.
This specification is based on the measurement at the condition below:
Measurement Conditions
Standard Test Land Pattern
Environment
Board Material
Board Dimensions
Copper Ratio
Mounting on Board (Wind velocity=0m/s)
Glass cloth epoxy plastic (Double sided)
40mm * 40mm * 1.6mm
Top side: Approx. 50%, Back side: Approx. 50%
φ 0.5mm * 44pcs
Through-holes
Measurement Result
(Ta=25°C, Tjmax=125°C)
Standard Test Land Pattern
420mW
Free Air
250mW
Power Dissipation
Thermal Resistance
θja = (125-25°C)/0.42W= 263°C/W
400°C/W
600
500
40
On Board
420
250
400
300
200
100
Free Air
0
0
25
50
75 85 100
125
150
Measurement Board Pattern
Ambient Temperature (°C)
IC Mount Area (Unit: mm)
Power Dissipation
16
相关型号：
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RICOH
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