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BD9306AFVM PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 BD9306AFVM
기능 High-efficiency Switching Regulator
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BD9306AFVM 데이터시트, 핀배열, 회로
Large Current External FET Controller Type Switching Regulators
Single-output Step-up,High-efficiency
Switching Regulator(Controller Type)
BD9306AFVM
Single-output Step-up,High-efficiency
Switching Regulator(Controller Type)
BD9305AFVM
No.09028EAT04
Description
BD9305AFVM / BD9306AFVM are 1-channel DC/DC converter controllers. Step-down DC/DC converter can be configured
by BD9305AFVM, and Step-up DC/DC converter can be configured by BD9306AFVM. In addition, the master slave function,
which is that the synchronization is possible at the time of multi-connection, is mounted.
Features
1) 1ch PWM Control DC/DC Converter Controller
2) Input Voltage Range:4.2 to 18V
3) Feed Back Voltage:1.25±1.6%
4) Oscillating Frequency Variable:100 to 800kHz
5) Built-in Soft Start Function
6) Standby Current of 0 A (Typ.)
7) Built-in Master / Slave Function
8) Protection Circuit : Under Voltage Lockout Protection Circuit
Thermal Shutdown Circuit
Short Protection Circuit of Timer Latch type
9) MSOP8 Package
Applications
TV, Power Supply for the TFT-LCD Panels used for LCD TVs, Back Lights
DSC, DVC, Printer, DVD ,DVD Recorder, Generally Consumer Equipments etc.
Absolute maximum ratings (Ta = 25°C)
Parameter
Symbol
Limit
Unit
Power supply voltage**
Vcc
20
Power dissipation
Pd
588*
Operating temperature range
Topr
-40 to +85
Storage temperature range
Tstg
-55 to +150
Maximum junction temperature
Tjmax
150
* Reduced by 4.7 mW/°C over 25°C, when mounted on a glass epoxy 4-layer board (70 mm 70 mm 1.6 mm)
** Must not exceed Pd.
V
mW
Recommended Operating Ranges (Ta=-40to +85)
Parameter
Symbol
Power supply voltage
Control Voltage
Timing Capacity
Timing Resistance
Oscillating frequency
Vcc
VENB
CT
RT
Fosc
Min
4.2
100
5
100
Limit
Typ
12
Max
18
Vcc
1000
50
800
Unit
V
V
pF
kΩ
kHz
www.rohm.com
© 2009 ROHM Co., Ltd. All rights reserved.
1/14
2009.05 - Rev.A




BD9306AFVM pdf, 반도체, 판매, 대치품
BD9306AFVM, BD9305AFVM
Electrical Characteristics (Unless otherwise specified,Ta=25)
250
200 Ta=85
Ta=25
150
100
50 Ta=-40
0
0.0 2.5 5.0 7.5 10.0 12.5
ENB VOLTAGE:VENB[V]
Fig.10 ENB Input Current
90
88
86
84
82
80
-40
-15 10 35 60
AMBIENT TEMPERATURE[]
85
Fig.13 Temperature vs MAX Duty
(BD9306AFVM)
125
100
75
50
25
0
0.0 0.5 1.0 1.5 2.0 2.5
COMP VOLTAGE:VCOMP[V]
Fig.11 COMP vs DUTY
(BD9305AFVM)
90
86
82
78
74
70
200
300 400 500 600 700
SWITCHING FREQUENCY[kHz]
800
Fig.14 Frequency vs MAX Duty
(BD9306AFVM)
ΔV=380mV
Io=500mA
VCC=12V Vo=16V
Fig.16 Load Response
(BD9306AFVM)
100
90
80
70
60
50
40
30
20
10
0
0.0
VCC=12V Vo=5V
Io=SWEEP
Fsw=220kHz
Ta=25
0.5 1.0 1.5
OUTPUT CURRENT[A]
2.0
Fig.17 Efficiency Characteristics
(BD9305AFVM)
Technical Note
125
100
75
50
25
0
0.0 0.5 1.0 1.5 2.0 2.5
COMP VOLTAGE:VCOMP[V]
Fig.12 COMP vs DUTY
(BD9306AFVM)
ΔV=166mV
Io=1A
VCC=12V Vo=5V
Fig.15 Load Response
(BD9305AFVM)
100
90
80
70
60
50
40
30
20
10
0
0.0
VCC=12V Vo=16V
Io=SWEEP
Fsw=220kHz
Ta=25
0.2 0.4 0.6 0.8
OUTPUT CURRENT[A]
1.0
Fig.18 Efficiency Characteristics
(BD9306AFVM)
www.rohm.com
© 2009 ROHM Co., Ltd. All rights reserved.
4/14
2009.05 - Rev.A

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BD9306AFVM 전자부품, 판매, 대치품
BD9306AFVM, BD9305AFVM
Technical Note
Block Operation
Error amplifier (Err)
It is a circuit that compares the standard voltage of 1.25V (TYP) and the feedback voltage of output voltage.
The switching Duty is determined by the COMP terminal voltage of this comparison result.
Oscillator (OSC)
It is a block, in which the switching frequency is determined by RT and CT, and the triangular wave is determined by RT
and CT.
PWM
The Duty is determined by comparing the output of Error amplifier and the angular wave of Oscillator.
The switching Duty of BD9306AFVM is limited by the maximum duty ratio that is determined by the internal part, and will
not be up to 100%.
DRV
The gate of the power FET that is connected to the outside is driven by the switching Duty determined by PWM.
VREF
It is a block that outputs the internal standard voltage of 2.5V (TYP).
The internal circuit is entirely the bearer of this standard voltage that is turned ON / OFF by the ENB terminal.
Protection circuits (UVLO / TSD)
UVLO (low-voltage Lock Out circuit) shuts down the circuits when the voltage is below 3.5V (MIN).
Moreover, TSD (temperature protection circuit) shuts down the IC when the temperature reaches 175(TYP).
Soft Start Circuit
The Soft Start Circuit limits the current at the time of startup while ramping up the output voltage slowly.
The overshoot of output voltage and the plunging current can be prevented.
Timer Latch
It is an output short protection circuit that detects the output short if the output of error amplifier (COMP voltage) is more
than 1.7V (TYP). If the COMP voltage becomes more than 1.7V, the counter begins to operate, the LATCH is locked when
the counter counts to 2200, and the GD output shuts down. (the frequency of counter is determined by RT and CT.)
Once the LATCH is locked, the GD output does not operate until it is restarted by ENB or VCC. If the output short is
removed while the Timer latch is counting, the counter is reset.
Selecting Application Components
(1) Setting the output L constant (Step Down DC/DC)
The inductance L to use for output is decided by the rated current ILR and input current maximum value IOMAX of the
inductance.
IL
IOMAX + IL should not
2
VCC
reach the rated value level
ILR
IOMAX mean
current
IL Vo
L
t Co
Fig.22 Coil Current Waveform (Step Down DC/DC)
Fig.23 Output Application Circuit (Step Down DC/DC)
Adjust so that IOMAX+ ΔIL/ 2 does not reach the rated current value ILR.
At this time, IL can be obtained by the following equation.
ΔIL=
1
L
X (Vcc-Vo)X
Vo
Vcc
X
1
f
[A]
Set with sufficient margin because the inductance L 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.
www.rohm.com
© 2009 ROHM Co., Ltd. All rights reserved.
7/14
2009.05 - Rev.A

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부품번호상세설명 및 기능제조사
BD9306AFVM

High-efficiency Switching Regulator

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