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PDF BD8184MUV Data sheet ( Hoja de datos )
| Número de pieza | BD8184MUV | |
| Descripción | Power Supply ICs | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Power Supply ICs for TFT-LCD Panels
Multi-channel System
Power Supply IC
for Small to Middle PANEL
BD8184MUV
No.11035EAT18
Description
The BD8184MUV is a system power supply for the TFT-LCD panels used for liquid crystal Monitors and Note Display.
Incorporates high-power FET with low on resistance for large currents that employ high-power packages, thus driving large
current loads while suppressing the generation of heat. A charge pump controller is incorporated as well, thus greatly
reducing the number of application components. Also Gate Shading Function is included.
Features
1) Boost DC/DC converter; 18 V / 2.5 A switch current. (Target specification is ±1% accurate.)
2) Switching frequency: 1.2 MHz
3) Operational Amplifier (short current 200mA)
4) Incorporates Positive / Negative Charge-pump Controllers.
5) Gate Shading Function
6) VQFN024V4040 Package (4.0 mm x 4.0 mm)
7) Protection circuits: Under Voltage Lockout Protection Circuit
Thermal Shutdown Circuit (Latch Mode)
Over Current Protection Circuit (AVDD)
Timer Latch Mode Short Circuit Protection (AVDD SRC VGL)
Over / Under Voltage Protection Circuit for Boost DC/DC Output
No SCP time included (160ms from UVLO-off)www.DataSheet.co.kr
Applications
Power supply for the TFT-LCD panels used for LCD Monitors and Note Display
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
1/17
2011.11 - Rev.A
Datasheet pdf - http://www.DataSheet4U.net/
1 page  
BD8184MUV
●Electrical characteristic curves (Reference data)
(Unless otherwise specified VIN = 3.3V, AVDD = 10V and TA=25℃)
2.0
1.6
85℃
1.2
25℃
0.8 -40℃
0.4
0.0
012345
VIN [V]
Fig.1 Curcuit Current
(No switching)
50
45
40
35 85℃
30 25℃
25 -40℃
20
15
10
5
0
012345
VIN [V]
Fig.2 Curcuit Current
(Switching)
1.40
1.30
1.20
1.10
1.00
2 2.5 3 3.5 4 4.5 5 5.5
VIN [V]
Fig.4 Dependent on Input
Voltage Freqency
1.30
1.29
1.28
1.27 85℃
25℃
1.26
1.25
1.24
-40℃
1.23
1.22
1.21
1.20
2 2.5 3 3.5 4 4.5 5 5.5
VIN [V]
Fig.5 VREF Line Regulation
100
80 85℃
25℃
60
-40℃
40
20
0
0123
VCOMP [V]
Fig.7 COMP V.S.CDUTY
10
www.DataSheet.co.kr
6
2
-2
-6
-10
0
12
VCOMP [V]
3
Fig.8 COMP Sink Current
IAVDD
AVDD
IAVDD
AVDD
Fig.10 Load Transient Response
Falling
Fig.11 Load Transient Response
Rising
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
5/17
Technical Note
1.40
1.30
1.20
1.10
1.00
-40 -15 10 35 60 85
Ta [℃]
Fig.3 Dependent on
Temparactue Freqency
1 .3 0
1 .2 5
25℃
-40℃
1 .2 0
85℃
1 .1 5
0
5 10 15 20 25 30
IVREF[mA]
Fig.6 VREF Load Regulation
10
6
2
-2
-6
-10
0
12
VCOMP [V]
3
Fig.9 COMP Source Current
100
90
80
VIN=3.3V
AVDD=9.8V
70 Fsw=1.177MHz
VGH,VGL→NoLoad
60
0
100 200 300 400
IAVDD [mA]
Fig.12 Boost Converter
Efficiency
500
2011.11 - Rev.A
Datasheet pdf - http://www.DataSheet4U.net/
5 Page 
BD8184MUV
Technical Note
●How to select parts of application
(1-1) Setting the Output L Constant (Boost Converter)
The coil to use for output is decided by the rating current ILR and input current maximum value IINMAX of the coil.
IINMAX + ∆IL should not reach
VIN
IL the rating value level
L IL
ILR VDD
IINMAX
average current
Co
Fig.27 Coil Current Waveform
Fig. 28 Output Application Circuit Diagram
Adjust so that IINMAX +∆IL does not reach the rating current value ILR. At this time, ∆IL can be obtained by the following equation.
1
∆IL = L
VIN
VDD-VIN
VIN
1
f
[A] Here, f is the switching frequency.
Set with sufficient margin because the coil value may have the dispersion of 30%. If the coil current exceeds the
rating current ILR of the coil, it may damage the IC internal element.
BD8164MUV uses the current mode DC/DC converter control and has the optimized design at the coil value. A coil
inductance (L) of 4.7 uH to 15 uH is recommended from viewpoints of electric power efficiency, response, and
stability.
(2) Output Capacity Settings
For the capacitor to use for the output, select the capacitorwww.DataSheet.co.kr which has the larger value in the ripple voltage VPP
allowance value and the drop voltage allowance value at the time of sudden load change. Output ripple voltage is
decided by the following equation.
∆VPP
= ILMAX RESR +
1 VIN (ILMAX -
fCo AVDD
∆IL )
2
Here, f is the switching frequency.
[V]
Perform setting so that the voltage is within the allowable ripple voltage range.
For the drop voltage during sudden load change; VDR, please perform the rough calculation by the following equation.
VDR = ∆I
Co
10 us
[V]
However, 10 s is the rough calculation value of the DC/DC response speed. Please set the capacitance considering
the sufficient margin so that these two values are within the standard value range.
(3) Selecting the Input Capacitor
Since the peak current flows between the input and output at the DC/DC converter, a capacitor is required to install at
the input side. For the reason, the low ESR capacitor is recommended as an input capacitor which has the value
more than 10 F and less than 100 m. If a capacitor out of this range is selected, the excessive ripple voltage is
superposed on the input voltage, accordingly it may cause the malfunction of IC.
However these conditions may vary according to the load current, input voltage, output voltage, inductance and
switching frequency. Be sure to perform the margin check using the actual product.
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
11/17
2011.11 - Rev.A
Datasheet pdf - http://www.DataSheet4U.net/
11 Page | ||
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