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PDF BD8157EFV Data sheet ( Hoja de datos )

Número de pieza BD8157EFV
Descripción Single-channel Source Voltage Output Power Supply + Gamma Buffer Amp IC
Fabricantes ROHM Semiconductor 
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Power Supply IC Series for TFT-LCD Panels
Single-channel Source Voltage
Output Power Supply + Gamma Buffer Amp ICs
BD8151EFV,BD8157EFV
No.09035EBT11
Description
The BD8151EFV,BD8157EFV power supply IC are designed for use with TFT-LCD panels. It incorporates a built-in source
voltage step-up switching regulator and gamma correction buffer amp. The combination of a source power supply and
gamma correction buffer on a single chip delivers significant cost savings.
Compatible with input voltages from 2.5 V to 5.5 V (BD8151EFV), 2.1 V to 4.0 V (BD8157EFV), the IC supports low-voltage
operation and reaches over 85% efficiency with a 2.5 V input, contributing to low power consumption designs.
Features
1) Single-chip implementation of a source power supply and gamma correction buffer
2) Support for low-voltage operation, with input voltages from 2.5 V to 5.5 V (BD8151EFV)
2.1 V to 4.0 V (BD8157EFV)
3) Built-in 1.4 A, 0.2 low-voltage FET
4) Switchable step-up DC/DC switching frequencies: 600 kHz/1.2 MHz
5) Current mode PWM control
6) Under-voltage lockout protection circuit
7) Built-in overcurrent protection circuit
8) Built-in thermal shutdown circuit
Applications
Satellite navigation systems, laptop PC TFT LCD panels
LCD monitor panels
Absolute maximum ratings (Ta = 25)
Parameter
Symbol
Limit
Power supply voltage
Vcc 7
Power dissipation
Operating temperature range
BD8151EFV
BD8157EFV
Pd
Topr
1000*
40 to +85
40 to +125
Storage temperature range
Tstg 55 to +150
Switching pin current
Isw 1.5**
Switching pin voltage
Vsw 15
VS voltage
VS 15
Maximum junction temperature
Tjmax
* Reduced by 8 mW/over 25, when mounted on a glass epoxy board (70 mm x 70 mm x 1.6 mm).
** Must not exceed Pd.
150
Unit
V
mW
A
V
V
°C
Recommended Operating Ranges (Ta = 25)
Parameter
Power supply voltage BD8151EFV
Power supply voltage BD8157EFV
Switching current
Switching pin voltage
VS pin voltage
Symbol
Vcc
Vcc
ISW
VSW
VS
Min.
2.5
2.1
5
Limit
Typ.
3.3
2.5
9
Max.
5.5
4.0
1.4
14
14
Unit
V
V
A
V
V
www.rohm.com
© 2009 ROHM Co., Ltd. All rights reserved.
1/17
2009.07 - Rev.B

1 page




BD8157EFV pdf
BD8151EFV, BD8157EFV
Reference Data (Unless otherwise specified, Ta = 25)
100
90
80
70
60
BD8157EFV
50
2.0 2.5 3.0 3.5 4.0
SUPPLY VOLTAGE : VCC[V]
Fig. 13 Power Efficiency vs
Power Supply Voltage
10
0.8
BD8157EFV
0.6
F=600kHz
0.4
F=1200kHz
0.2
0
2.1 2.4 2.7 3.0 3.3 3.6 3.9
SUPPLY VOLTAGE : VCC[V]
Fig. 14 Max. Load Current vs
Power Supply Voltage
10
8
1
6
4
0.1
2
0.01
0.001
0.01
0.1
SS CAPACITANCE [μF]
Fig. 16 SS Capacitance vs
Delay Time
10
5
0
-5
-10
-15
-20
1
23 4 56 78
BUFFER INPUT VOLTAGE:VIN[V]
Fig. 19 Buffer Voltage
9
0
0 5 10
VS VOLTAGE : VS[V]
Fig. 17 VS Pin Current
15
9
8
7
-40℃
6
5
4 25125
3
2
1
0
0 25 50 75 100 125 150 175 200
OUTPUT CURRENT : IOUT[mA] .
Fig. 20 Buffer Sinking Current
9
8
7
6
5
4 12525-40
3
2
1
0
0 50 100 150 200 250 300
OUTPUT CURRENT : IOUT[mA] .
Fig. 22 VCOM Sinking Current
9
8
7
6 -40
25
125
5
4
3
2
1
0
-300 -250 -200 -150 -100 -50
0
OUTPUT CURRENT : IOUT[mA]
Fig. 23 VCOM Source Current
Technical Note
Io=0mA
Io=100mA
VO
100mV/div
20us/div
Fig. 15 Load Response
Waveform
9
8.8
8.6
8.4
8.2
8
0.0 0.1 1.0
LOAD CURRENT : IO[A]
Fig. 18 Output voltage
Load Regulation 1
9
8
7
6
5 -40
25
125
4
3
2
1
0
-200 -175 -150 -125 -100 -75 -50 -25 0
OUTPUT CURRENT : IOUT[mA] .
Fig. 21 Buffer Source Current
IN
OUT
1us/div
2V/div
Fig. 24 Slew Rate Waveform
www.rohm.com
© 2009 ROHM Co., Ltd. All rights reserved.
5/17
2009.07 - Rev.B

5 Page





BD8157EFV arduino
BD8151EFV, BD8157EFV
Technical Note
(9) Setting RC, CC of the phase compensation circuit
In the current mode control, since the coil current is controlled, a pole (phase lag) made by the CR filter composed of the
output capacitor and load resistor will be created in the low frequency range, and a zero (phase lead) by the output
capacitor and ESR of capacitor will be created in the high frequency range. In this case, to cancel the pole of the power
amplifier, it is easy to compensate by adding the zero point with CC and RC to the output from the error amplifier as shown
in the illustration.
Open loop gain
A
Gain 0
dB
fp(Min)
fp(Max)
lOUTMin
lOUTMax
fz(ESR)
0
Phase
deg-90
Error amplifier phase compensation
A
Gain
dB
0
Phase 0
deg-90
Fig. 34 Gain vs Phase
L
fp =
fz (ESR) =
1
2   Ro Co
1
2   ESR Co
[Hz]
[Hz]
Pole at the power amplification stage
When the output current reduces, the load resistance
RO increases and the pole frequency lowers.
fp(Min) =
1
2   RoMax Co
[Hz] (At light-load)
fz(Max) =
1
2   RoMin Co
[Hz] (At heavy-load)
Zero at the power amplification stage
When the output capacitor is set larger, the pole
frequency lowers but the zero frequency will not
change. (This is because the capacitor ESR
becomes 1/2 when the capacitor becomes 2 times.)
fp (Amp.) =
1
2   Rc Cc
[Hz]
Vo
VCC Cin
Rc
Cc
Vcc,PVcc
COMP
SW
GND,PGND
ESR
Co
Fig. 35 Application Circuit Diagram
Ro
It is possible to realize the stable feedback loop by canceling the pole fp (Min.), which is created by the output capacitor
and load resistor, with CR zero compensation of the error amplifier as shown below.
fz (Amp.) = fp (Min.)
1
2   Rc Cc
=
1
2   Romax Co
[Hz]
As the setting range for the resistor, 1 kto 10 kis recommended. When the resistor is set to 1 kor lower, the effect by
phase compensation becomes low and it may cause the oscillation of output voltage. When it is set to 10 kor larger, the
COMP pin becomes Hi-Z and the switching noise becomes easy to superpose. Therefore the stable switching pulse
cannot be generated and the irregular ripple voltage may be generated on the output voltage.
As the setting range for the capacitance, 3,300 pF to 10,000 pF is recommended. When the capacitance is set to 3,300 pF
or lower, the irregular ripple voltage may be generated on the output voltage due to the effect of switching noise. When it is
set to 10,000 pF or larger, the response becomes worse and the output voltage fluctuation becomes large. Accordingly it
may require the output capacitor which is larger than the necessary value.
www.rohm.com
© 2009 ROHM Co., Ltd. All rights reserved.
11/17
2009.07 - Rev.B

11 Page







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