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参数资料
| 型号： | BD8112EFV-ME2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 14/25页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER 24-VSSOP |
| 应用说明： | Automotive Applications |
| 标准包装： | 1 |
| 恒定电流： | 是 |
| 拓扑： | 高端，低端，PWM，降压（降压），升压（升压） |
| 输出数： | 2 |
| 内部驱动器： | 两者兼有 |
| 类型 - 主要： | 车载，背光 |
| 类型 - 次要： | 高亮度 LED（HBLED），白色 LED |
| 频率： | 250kHz ~ 600kHz |
| 电源电压： | 5 V ~ 30 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-VSSOP（0.220"，5.60mm 宽）裸露焊盘 |
| 供应商设备封装： | 24-HTSSOP |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 105°C |
| 其它名称： | BD8112EFV-ME2DKR |
BD8112EFV-M
5. Selection of the output capacitor
Select the output capacitor Cout based on the requirement of the ripple voltage Vpp.
Technical Note
Vpp =
Iout
Cout
×
Vout
Vout+V IN
×
1
Fosc
+ IL_MIN × RESR
Choose Cout that allows the Vpp to settle within the requirement. Allow some margin also, such as the tolerance of the
external components.
6. Selection of the input capacitor
A capacitor at the input is also required as the peak current flows between the input and the output in DC/DC conversion.
We recommend an input capacitor greater than 10μF with the ESR smaller than 100m ? . The input capacitor outside of
our recommendation may cause large ripple voltage at the input and hence lead to malfunction.
7. Phase Compensation Guidelines
In general, the negative feedback loop is stable when the following condition is met:
? Overall gain of 1 (0dB) with a phase lag of less than 150o (i.e. a phase margin of 30o or more)
However, as the DC/DC converter constantly samples the switching frequency, the gain-bandwidth (GBW) product of the
entire series should be set to 1/10 the switching frequency of the system. Therefore, the overall stability characteristics
of the application are as follows:
? Overall gain of 1 (0dB) with a phase lag of less than 150o (i.e. a phase margin of 30o or more)
? GBW (frequency at gain 0dB) of 1/10 the switching frequency
Thus, to improve response within the GBW product limits, the switching frequency must be increased.
The key for achieving stability is to place fz near to the GBW.
V out
Phase-lead fz =
1
2 π CpcRpc
[Hz]
LED
FB
Phase-lag fp1 =
1
2 π RLCout
[Hz]
A
COMP
Rpc
Cpc
Good stability would be obtained when the fz is set between 1kHz ～ 10kHz.
In buck-boost applications, Right-Hand-Plane (RHP) Zero exists. This Zero has no gain but a pole characteristic in terms
of phase. As this Zero would cause instability when it is in the control loop, so it is necessary to bring this zero before the
GBW.
Vout+VIN/(Vout+VIN)
fRHP=
2 π I LOAD L
[Hz]
I LOAD: Maximum Load Current
It is important to keep in mind that these are very loose guidelines, and adjustments may have to be made to ensure
stability in the actual circuitry. It is also important to note that stability characteristics can change greatly depending on
factors such as substrate layout and load conditions. Therefore, when designing for mass-production, stability should be
thoroughly investigated and confirmed in the actual physical design.
www.rohm.com
? 2010 ROHM Co., Ltd. All rights reserved.
14/22
2011.08 - Rev.C
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