参数资料
| 型号： | BD9302FP-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 10/19页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 2A DL HSOP25 |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 0.8 V ~ 14.4 V |
| 输入电压： | 6 V ~ 18 V |
| 频率 - 开关： | 200kHz ~ 2.5MHz |
| 电流 - 输出： | 2A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 25-SOP（0.213"，5.40mm）+ 2 翼片 |
| 包装： | 标准包装 |
| 供应商设备封装： | 25-HSOP |
| 产品目录页面： | 1373 (CN2011-ZH PDF) |
| 其它名称： | BD9302FP-E2DKR |
(3) Setting of feedback resistance constant
In order to make settings of feedback resistance, refer to the formula shown. It is recommended to make setting of
resistance in the range of 10 k Ω to 330 k Ω . Setting the resistance to 10 k Ω or less will result in degraded power
efficiency, while setting it to 330 k Ω or more will increase the offset voltage due to the input bias current of 0.4 μ A (TYP)
of the internal error amplifier.
V O
Internal reference voltage: 0.6 V
R8
FB
R9
Fig.24
V O =
R8+R9
R9
￥ 0.6 [V]
(4) Setting of oscillation frequency
Connecting a resistor to the RT pin (pin 4) will allow for the setting of triangular wave oscillation frequency. The RT
determines the charge/discharge current to the internal capacitor, with which the frequency varies. Referring to Figure
shown below, make settings of the RT resistor. Recommended setting range is 10 to 100 k Ω . Be noted that any setting
outside of this range may turn OFF switching, thus impairing the operation guarantee.
100000
10000
1000
100
10
10
100
TIMING RESISTANCE : RT [k Ω ]
Fig.25 RT vs. Switching frequency
(5) Setting of soft start time
The soft start function will be required to prevent an excessive increase in the coil current and overshoot of the output
voltage, while in startup operation. Figure below shows the relationship between the capacitor and the soft start time.
Referring to this Figure, make the capacitor setting.
100
10
1
0
0.01
0.10
1.00
SS CAPACITOR : CSS [ μ F]
Fig.26 SS capacitance vs. Delay time
It is recommended to make setting of capacitance value in the range of 0.01 to 10 μ F. Setting the capacitance value to
0.01 μ F or less may cause overshoot to the output voltage. If any startup-related function (sequence) of other power
supply is provided, use a high-accuracy product (e.g. ￥ 5R) or the like.
Furthermore, since the soft start time varies with the input voltage, output voltage, load, coil, output capacitor, or else,
be sure to check to be sure this soft start time on the actual system.
10/16
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相关代理商/技术参数 |
参数描述 |
|---|---|
| BD9303FP-E2 | 制造商:ROHM Semiconductor 功能描述:1MHZ 2A POWER SWITCH REG. - Tape and Reel 制造商:ROHM Semiconductor 功能描述:POWER SWITCH REG. 1MHZ 2A |
| BD9305AFVM | 制造商:ROHM 制造商全称:Rohm 功能描述:Single-output Step-up,High-efficiency Switching Regulator(Controller Type) |
| BD9305AFVM-TR | 功能描述:直流/直流开关调节器 4.2-18V 100-800kHz 1 Chan Step-Down RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| BD9306AFVM | 制造商:ROHM 制造商全称:Rohm 功能描述:Single-output Step-up,High-efficiency Switching Regulator(Controller Type) |
| BD9306AFVM-TR | 功能描述:直流/直流开关调节器 4.2-18V 100-800kHz 1 Chan Step-Up RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
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