参数资料
| 型号： | BD9305AFVM-TR |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 8/15页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM 8-MSOP |
| 标准包装： | 1 |
| PWM 型： | 控制器 |
| 输出数： | 1 |
| 频率 - 最大： | 800kHz |
| 占空比： | 100% |
| 电源电压： | 4.2 V ~ 18 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 8-VSSOP，8-MSOP（0.110"，2.80mm 宽） |
| 包装： | 标准包装 |
| 其它名称： | BD9305AFVM-DKR BD9305AFVM-DKR-ND BD9305AFVMDKR |
BD9306AFVM, BD9305AFVM
Technical Note
(2) Setting the output L constant (Step Up DC/DC)
The inductance L to use for output is decided by the rated current ILR and input current maximum value IINMAX of the
inductance.
I INMAX + Δ I L should not
VCC
IL
2
reach the rated value level
L
I L
Vo
I INMAX mean
current
t
Fig.24 Coil Current Waveform (Step Up DC/DC)
Adjust so that I INMAX + Δ I L / 2 does not reach the rated current value I LR .
At this time, ? I L can be obtained by the following equation.
Co
Fig.25 Output Application Circuit (Step Up DC/DC)
Δ I L =
1
L
Vcc X
Vo-Vcc
Vo
X
1
ｆ
[A]
Where, f is the switching frequency
Set with sufficient margin because the inductance L value may have the dispersion of ± 30%.
If the coil current exceeds the rating current I LR of the coil, it may damage the IC internal element.
(3) Setting the output capacitor
For the capacitor C to use for the output, select the capacitor 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.
Δ V PP
=
Δ IL X R ESR +
Δ IL Vo 1
X X
2Co Vcc f
[V]
(Step Down DC/DC)
Δ V PP
= I LMAX X R ESR +
1
fCo
X
Vcc
Vo
X (I LMAX -
Δ I L
2
) [V]
(Step Up DC/DC)
Perform setting so that the voltage is within the allowable ripple voltage range.
For the drop voltage during sudden load change; V DR , please perform the rough calculation by the following equation.
V DR =
Δ I
Co
X 10 μ sec [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.
(4)Setting of feedback resistance constant
For both BD9305AFVM (step down) and BD9306AFVM (step up), please refer to the following formula for setting of
feedback resistance.
We recommend 10k Ω ~330k Ω as the setting range. If a resistance below 10k Ω is set, a drop in voltage efficiency will be
caused; if a resistance more than 330k Ω is set, the offset voltage becomes large because of the internal error amplifier ’s
input bias current of 0.05μA(Typ). Please set the maximum setting voltage of BD9306AFVM (step up) in such a way that
Duty : (Vo - Vcc) / Vo is less than 70%.
Vo
Reference Voltage 1.25V
Vo ＝
R1 + R2
R2
x 1.25
[V]
R1
R2
FB
8
－
ERR
＋
Fig.26 Feedback Resistance Setting
www.rohm.com
? 2009 ROHM Co., Ltd. All rights reserved.
8/14
2009.05 - Rev.A
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