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| 型号： | IR3623MTRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 19/27页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 32MLPQ |
| 标准包装： | 1 |
| PWM 型： | 电压模式 |
| 输出数： | 2 |
| 频率 - 最大： | 1.2MHz |
| 占空比： | 85% |
| 电源电压： | 8.5 V ~ 14.5 V |
| 降压： | 是 |
| 升压： | 无 |
| 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 ~ 125°C |
| 封装/外壳： | 32-VFQFN 裸露焊盘 |
| 包装： | 标准包装 |
| 其它名称： | IR3623MTRPBFDKR |
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IR3623MPbF
Inductor Selection
The inductor is selected based on output power,
operating frequency and efficiency requirements.
Low inductor value causes large ripple current,
resulting in the smaller size, faster response to a
load transient but poor efficiency and high output
noise. Generally, the selection of inductor value
can be reduced to desired maximum ripple
current in the inductor ( ? i ) . The optimum point is
usually found between 20% and 50% ripple of
the output current.
For the buck converter, the inductor value for
Output Capacitor Selection
The voltage ripple and transient requirements
determines the output capacitors types and
values. The criteria is normally based on the
value of the Effective Series Resistance (ESR).
However the actual capacitance value and the
Equivalent Series Inductance (ESL) are other
contributing components, these components can
be described as:
? V o ? ? V o ( ESR ) ? ? V o ( ESL ) ? ? V o ( C )
desired operating ripple current can be
determined using the following relation:
? V o ( ESR ) ? ? I L * ESR
- - - -(14)
? V o ( ESL ) ? ? in ? * ESL
V in ? V o ? L ?
? i
? t
; ? t ? D ?
1
F s
? V ?
? L ?
Where:
L ? ? V in ? V o ? ?
V o
V in ? ? i * F s
- - - - ( 13 )
? V o ( C ) ?
? I L
8 * C o * F s
V in ? Maximum input voltage
V o ? Output Voltage
? i ? Inductor ripple current
F s ? Switching frequency
? t ? Turn on time
D ? Duty cycle
For 2-phase single output application the inductor
ripple current is chosen between 10-40% of
maximum phase current
If ? i ? 35 %( I o ) , then the output inductor will be:
L = 0.37uH
The Panasonic ETQP4LR36WFC (L 1 =0.34uH,
24A, R L1 =1.1mOhm) provides a low profile
inductor suitable for this application.
Use the following equation to calculate C 12 and
R 12 for current sensing:
? V o ? Output voltage ripple
? I L ? Inductor ripple current
Since the output capacitor has major role in
overall performance of converter and determine
the result of transient response, selection of
capacitor is critical. The IR3623 can perform well
with all types of capacitors.
As a rule the capacitor must have low enough
ESR to meet output ripple and load transient
requirements, yet have high enough ESR to
satisfy stability requirements.
The goal for this design is to meet the voltage
ripple requirement in smallest possible capacitor
size. Therefore ceramic capacitor is selected due
to low ESR and small size.
Panasonic ECJ2FB0J226M (22uF, 6.3V, X5R
and EIA 0805 case size) is a good choice.
R 12 * C 12 ?
L 1
R L 1
In the case of tantalum or low ESR electrolytic
capacitors, the ESR dominates the output
voltage ripple, equation (14) can be used to
calculate the required ESR for the specific
This results to C 12 =0.33uF and R 12 =1.1K
voltage ripple.
www.irf.com
January 28, 2013
19
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相关代理商/技术参数 |
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|---|---|
| IR3624MPBF | 功能描述:IC REG CTRLR BUCK PWM VM 10-MLPD RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 V 降压:是 升压:无 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 ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| IR3624MTRPBF | 功能描述:开关变换器、稳压器与控制器 HI FREQ SYNC PWM 600kHz 5 or 12V 0.6 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 |
| IR3628MPBF | 功能描述:IC CTLR PWM BUCK SYNC 12-MLPD RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,000 系列:- 应用:电源，ICERA E400，E450 输入电压:4.1 V ~ 5.5 V 输出数:10 输出电压:可编程 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:42-WFBGA，WLCSP 供应商设备封装:42-WLP 包装:带卷 (TR) |
| IR3628MTRPBF | 功能描述:电压模式 PWM 控制器 HI FREQ SYNC PWM 600kHz 5 or 12V 0.6 RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| IR3629 | 制造商:IRF 制造商全称:International Rectifier 功能描述:HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER WITH POWER GOOD OUTPUT |
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