参数资料
| 型号： | BD9011KV-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 8/30页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST PWM 48-VQFP |
| 标准包装： | 1 |
| PWM 型： | 控制器 |
| 输出数： | 2 |
| 频率 - 最大： | 550kHz |
| 电源电压： | 3.9 V ~ 30 V |
| 降压： | 是 |
| 升压： | 是 |
| 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 ~ 105°C |
| 封装/外壳： | 48-LQFP |
| 包装： | 标准包装 |
| 产品目录页面： | 1373 (CN2011-ZH PDF) |
| 其它名称： | BD9011KV-E2DKR |
第1页第2页第3页第4页第5页第6页第7页当前第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页
● Application component selection
(1) Setting the output L value
The coil value significantly influences the output ripple current.
Thus, as seen in equation (5), the larger the coil, and the higher
Δ I L
the switching frequency, the lower the drop in ripple current.
Fig-17
Δ IL =
（ VCC-VOUT ）× VOUT
L × VCC × f
[A] ???（ 5 ）
VCC
I L
VOUT
The optimal output ripple current setting is 30% of maximum current.
Δ IL = 0.3 × IOUTmax.[A] ???（ 6 ）
L
Co
L=
（ VCC-VOUT ）× VOUT
Δ IL × VCC × f
[H] ???（ 7 ）
Fig-18
Output ripple current
（Δ IL ： output ripple current
f ： switching frequency ）
※ Outputting a current in excess of the coil current rating will cause magnetic saturation of the coil and decrease
efficiency.
Please establish sufficient margin to ensure that peak current does not exceed the coil current rating.
※ Use low resistance (DCR, ACR) coils to minimize coil loss and increase efficiency.
(2) Setting the output capacitor Co value
Select the output capacitor with the highest value for ripple voltage (V PP ) tolerance and maximum drop voltage
(at rapid load change). The following equation is used to determine the output ripple voltage.
Δ I L
Vo
1
Step down
Δ V PP = Δ I L × R ESR +
×
×
[V]
Note: f ： switching frequency
Co
Vcc
f
Be sure to keep the output Co setting within the allowable ripple voltage range.
※ Please allow sufficient output voltage margin in establishing the capacitor rating. Note that low-ESR capacitors enable
lower output ripple voltage.
Also, to meet the requirement for setting the output startup time parameter within the soft start time range, please factor
in the conditions described in the capacitance equation (9) for output capacitors, below.
Co ≦
TSS × (Limit – IOUT)
VOUT
??? （ 9 ）
Tss ： soft start time
ILimit ： over current detection value （ 2/16 ） reference
Note: less than optimal capacitance values may cause problems at startup.
(3) Input capacitor selection
VIN
Cin
L
VOUT
Co
The input capacitor serves to lower the output impedance of the power
source connected to the input pin (VCC). Increased power supply output
impedance can cause input voltage (VCC) instability, and may negatively
impact oscillation and ripple rejection characteristics. Therefore, be
certain to establish an input capacitor in close proximity to the VCC and
GND pins. Select a low-ESR capacitor with the required ripple current
capacity and the capability to withstand temperature changes without
wide tolerance fluctuations. The ripple current IRMSS is determined
using equation (10).
IRMS = IOUT ×
VOUT （ VCC - VOUT ）
[A] ???（ 10 ）
VCC
Also, be certain to ascertain the operating temperature, load range and
Fig-19
Input capacitor
MOSFET conditions for the application in which the capacitor will be used,
since capacitor performance is heavily dependent on the application’s
input power characteristics, substrate wiring and MOSFET gate drain
capacity.
8/29
相关PDF资料 |
PDF描述 |
|---|---|
| 1008-391K | COIL .39UH UNSHIELDED SMD |
| AVS107M50G24T-F | CAP ALUM 100UF 50V 20% SMD |
| ECM43DRYH | CONN EDGECARD 86POS DIP .156 SLD |
| AVS107M35G24T-F | CAP ALUM 100UF 35V 20% SMD |
| RBC17DREF-S734 | CONN EDGECARD 34POS .100 EYELET |
相关代理商/技术参数 |
参数描述 |
|---|---|
| BD9012KV | 制造商:ROHM 制造商全称:Rohm 功能描述:Dual-output, high voltage, high-efficiency step-down switching controller |
| BD9012KV-E2 | 功能描述:开关变换器、稳压器与控制器 Step Down; 2 Outputs RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| BD9013KV-E2 | 功能描述:DC/DC 开关控制器 Step Down; 2 Outputs RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| BD9015KV-ME2 | 功能描述:Buck Regulator Positive Output Step-Down DC-DC Controller IC 48-VQFPC (7x7) 制造商:rohm semiconductor 系列:- 包装:剪切带（CT） 零件状态:有效 输出类型:晶体管驱动器 功能:降压 输出配置:正 拓扑:降压 输出数:2 输出阶段:1 电压 - 电源（Vcc/Vdd）:3.9 V ~ 30 V 频率 - 开关:250kHz ~ 550kHz 占空比（最大）:- 同步整流器:是 时钟同步:是 串行接口:- 控制特性:使能，频率控制，电源良好，软启动 工作温度:-40°C ~ 105°C（TA） 封装/外壳:48-LQFP 供应商器件封装:48-VQFPC（7x7） 标准包装:1 |
| BD9016KV-ME2 | 制造商:ROHM Semiconductor 功能描述: |
发布紧急采购，3分钟左右您将得到回复。