参数资料
| 型号： | BD8966FVM-TR |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 12/19页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 0.8A MSOP8 |
| 标准包装： | 3,000 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1 V ~ 2.5 V |
| 输入电压： | 4 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 800mA |
| 同步整流器： | 是 |
| 工作温度： | -25°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-VSSOP，8-MSOP（0.110"，2.80mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-MSOP |
BD8966FVM
Selection of Components Externally Connected
1. Selection of inductor (L)
Datasheet
L×V CC ×f
I L
V CC
IL
L
ΔI L
VOUT
The inductance significantly depends on output ripple current.
As seen in the equation (1), the ripple current decreases as the
inductor and/or switching frequency increases.
(V CC -V OUT )×V OUT
ΔI L = [A] ??? (1)
Appropriate ripple current at output should be 30% more or less of
the maximum output current.
ΔI L =0.3×I OUT max. [A] ??? (2)
Co
L=
(V CC -V OUT )×V OUT
ΔI L ×V CC ×f
[H] ??? (3)
Fig.26 Output ripple current
(ΔI L : Output ripple current, and f: Switching frequency)
* Current exceeding the current rating of the inductor results in magnetic saturation of the inductor, which decreases
efficiency.
The inductor must be selected allowing sufficient margin with which the peak current may not exceed its current rating.
If V CC =5V, V OUT =1.5V, f=1MHz, Δ I L =0.3 × 0.8A=0.24A, for example,
L=
(5-1.5)×1.5
0.24×5×1M
=4.375μ → 4.7[μH]
* Select the inductor of low resistance component (such as DCR and ACR) to minimize dissipation in the inductor for
better efficiency.
2. Selection of output capacitor (C O )
V CC
V OUT
Output capacitor should be selected with the consideration on the stability region and the
equivalent series resistance required to smooth ripple voltage.
Output ripple voltage is determined by the equation (4) ：
L
ESR
Co
ΔV OUT =ΔI L ×ESR [V] ??? (4)
( Δ I L : Output ripple current, ESR: Equivalent series resistance of output capacitor)
*Rating of the capacitor should be determined allowing sufficient margin
against output voltage. Less ESR allows reduction in output ripple voltage.
Fig.27 Output capacitor
As the output rise time must be designed to fall within the soft-start time, the capacitance of output capacitor should be
determined with consideration on the requirements of equation (5):
Co ≦
T SS ×(I limit -I OUT )
V OUT
??? (5)
Tss: Soft-start time
I limit : Over current detection level, 2A(Typ)
In case of BD8966FVM, for instance, and if V OUT =1.5V, I OUT =0.8A, and T SS =1ms,
Co ≦
1m×(2-0.8)
1.5
≒ 800[μF]
Inappropriate capacitance may cause problem in startup.
A 10 μF to 100 μF ceramic capacitor is recommended.
www.rohm.com
? ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
12/17
TSZ02201-0J3J0AJ00060-1-2
02.MAR.2012. Rev.001
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