参数资料
| 型号： | BD95513MUV-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 13/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 3A 32VQFN |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.7 V ~ 5 V |
| 输入电压： | 4.5 V ~ 28 V |
| PWM 型： | 混合物 |
| 频率 - 开关： | 200kHz ~ 600kHz |
| 电流 - 输出： | 3A |
| 同步整流器： | 无 |
| 工作温度： | -10°C ~ 100°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-VFQFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | VQFN032V5050 |
| 产品目录页面： | 1373 (CN2011-ZH PDF) |
| 其它名称： | BD95513MUV-E2DKR |
BD95513MUV
4. Frequency Adjustment
Technical Note
500
450
From top: V IN =
5V
The resistance connected to the FS terminal adjusts the on-time
(t ON ) during normal operation as illustrated to the left. When t ON ,
input voltage and V REF voltage are known, the switching frequency
can be determined by the following formula:
400
350
7V
12V
19V
F=
V REF
V IN × t ON
??? (10)
300
250
200
150
100
50
0
25V
However, real-life considerations (such as external MOSFET gate
capacitance and switching time) must be factored in as they affect
the overall switching rise and fall time. This leads to an increase
in t ON , lowering the total frequency slightly.
Additionally, when output current lingers around 0A in continuous
mode, this “dead time” also has an effect upon t ON , further lowering
the switching frequency. Confirm the switching frequency by
measuring the current through the coil (at the point where current
does not flow backwards) during normal operation.
50
100
150
200
250
300
RFS[kΩ]
The BD95513MUV operates by feeding the output voltage back through a resistive voltage divider. The output voltage is
set by the following equation (see schematic below):
Output Voltage =
R1+R2
R2
×
1
V REF (0.7V) + 2 ×Δ I L × ESR ??? (11)
The switching frequency is also amplified by the same resistive voltage divider network:
f sw
=
R1+R2
R2
× (frequency set by R FS ) [Hz] ??? (12)
V IN
V IN
REF(0.7V)
H 3 Reg TM
CONTROLLA
R
S
Q
SLLM TM
Driver
Circuit
Output Voltage
ESR
FB
www.rohm.com
? 2010 ROHM Co., Ltd. All rights reserved.
13/17
SLLM
R1
R2
2010.10- Rev.A
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