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| 型号： | BD9207FPS-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 5/14页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR STEPDWN 1.5A TO252S-5 |
| 产品培训模块： | LED Driver Solutions |
| 标准包装： | 1 |
| 拓扑： | PWM，降压（降压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 频率： | 810kHz ~ 990kHz |
| 电源电压： | 8 V ~ 35 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-252-5，DPak（4 引线 + 接片），TO-252AD |
| 供应商设备封装： | TO-252-5 |
| 包装： | 标准包装 |
| 工作温度： | -20°C ~ 85°C |
| 其它名称： | BD9207FPS-E2DKR |
BD9207FPS
Technical Note
● Selection and setting of application parts
Coil L1
The application efficiency will decrease by the larger serial resistance element of coil. Moreover, because OCP operates
by 1.6A(min) or more, so please notice the heat generated by overload output or short.
Please set current ratings of coil with I OUT (MAX) ＋ ⊿ IL or more. Iout （ MAX ） : maximum load current
If current flows more than ratings current, then coil generates heat, magnetic saturation, and causes oscillation or low
efficiency.
Please select the peak current with enough margins not to exceed current rating of coil.
⊿IL . =
(VCC － VOUT)
L1
×
VOUT
VCC
×
1
fosc
L1: Coil value,VCC: Input voltage,VOUT: Output voltage, ⊿ IL: Ripple current, fosc: Oscillation frequency
When value the efficiency , we recommend C10-H5R(mitsumi) . Efficiency will be improved about 1~2%.
Schottky diode D1
Please select Schottky diode with lowest forward voltage VF.
(We can suppress the dissipation of forward voltage descent, and raise the efficiency. ）
Diode selection is based on maximum forward current rating, reverse voltage rating and permissible power dissipation of
diode.
? The maximum current ratings are assumed more than the value of maximum load current+ coil ripple current （ ⊿ I L ） .
? Reverse voltage rating is set to be VIN or more.
? Please choose the smallest one of reverse current IR.
Especially, IR grows at high temperature, and causes thermo runaway.
? Select the diode which permissible power dissipation within ratings.
Diode power dissipation Pdi is shown below.
Pdi=Iout(MAX)×Vf×(1-VOUT/VCC)
Iout （ MAX ） : Load current. Vf: Forward voltage, VOUT: Output voltage, VCC: Input voltage
Output capacitor C1
Select the output capacitor with ESR met the following formula.
ESR ≦⊿ VL/ ⊿ IL
⊿ VL : Permissible ripple voltage, ⊿ IL : Ripple current
Moreover, permissible ripple current effective value of output capacity is calculated by the next formula, and use this
value to select the capacitor with enough margins.
IRMS = ⊿ IL/2 √ 3
IRMS: Permissible ripple current effective value of output capacity, ⊿ IL : Ripple current
Ceramic capacitor must use the one more than B characteristic.
Besides above mentioned, IC might not be normally operated according to the different setting condition of ambient
temperature and output voltage.
Moreover, even aluminum electrolytic capacitor can be used, please confirm its operation enough before using it.
Input capacitor C2
Input capacitor built in Pch MOS FET ON is the current supply of coil by FET.
So, please close to IC as near as possible to connect it. Enough margins is taken on setting input capacitor in capacitor
withstand voltage and permissible ripple current value. According to the ripple current effective value of input capacitor
shown below, select the capacitor with enough permissible ripple current value.
IRMS ＝ IOUT× √ (1 － VOUT / VCC)×VOUT / VCC
IRMS : Permissible ripple current value of input capacitor
IOUT : Load current. VOUT: Output voltage, VCC: Input voltage
www.rohm.com
? 2009 ROHM Co., Ltd. All rights reserved.
5/11
2009.07 - Rev.A
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