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参数资料
| 型号： | IR3638STRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 10/15页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 14-SOIC |
| 标准包装： | 1 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 440kHz |
| 占空比： | 95% |
| 电源电压： | 5 V ~ 13.2 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： | 0°C ~ 125°C |
| 封装/外壳： | 14-SOIC（0.154"，3.90mm 宽） |
| 包装： | 标准包装 |
| 产品目录页面： | 1384 (CN2011-ZH PDF) |
| 其它名称： | IR3638STRPBFDKR |
IR3638SP b F
Inductor Selection (Cont..)
For the buck converter, the inductor value for
desired operating ripple current can be
determined using the following relation:
It is recommended to select output capacitor with
low enough ESR to meet output voltage ripple
and step load transient requirements.
PosCap capacitors offer low ESR with large
V in ? V o = L ?
Δ i
Δ t
; Δ t = D ?
1
F s
storage capacity per unit volume. These
capacitors offer a cost effective output capacitor
solution.
L = ( V in ? V o ) ?
V o
V in ? Δ i * F s
--( 5 )
Sanyo 2R5TPF470M (2.5V, 470uF, 10mOhm) is
selected for this design.
Equation (6) can be used to calculate the
V in = Maximum input voltage
required ESR for the specific voltage ripple.
V o = Output Voltage
Δ i = Inductor ripple current
One Capacitor would meet the voltage ripple
requirement.
F s = Switching frequency
Δ t = Turn on time
D = Duty cycle
Power MOSFET Selection
The IR3638 uses two N-Channel MOSFETs. The
selections criteria to meet power transfer
If Δ i ≈ 40 %( I o ) , then the output inductor will be:
requirements is based on maximum drain-source
voltage (V DSS ), gate-source drive voltage (V gs ),
L = 0.95uH
The coilcraft DO3316H-102ML (1uH,
6mOhm) is suitable for this application.
10A,
maximum output current, On-resistance R DS(on)
and thermal management.
The MOSFET must have a maximum operating
voltage (V DSS ) exceeding the maximum input
voltage (V in ).
Output Capacitor Selection
The gate drive requirement is almost the same
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
for both MOSFETs. Logic-level transistor can be
used and caution should be taken with devices at
very low V gs to prevent undesired turn-on of the
complementary MOSFET, which results a shoot-
through current.
Equivalent Series Inductance (ESL) are other
The total power dissipation for MOSFETs
contributing components, these components can
includes conduction and switching losses. For
be described as:
the Buck converter the average inductor current
is equal to the DC load current. The conduction
P cond = (upper switch) = I load ? R ds(on) ? D ? ?
Δ V o = Δ V o ( ESR ) + Δ V o ( ESL ) + Δ V o ( C )
loss is defined as:
2
P cond = (lower switch) = I load ? R ds(on) ? (1 ? D) ? ?
Δ V o ( ESR ) = Δ I L * ESR
- -(6)
2
? = R ds(on) temperatur e dependency
= ? in ? * ESL
Δ V o ( ESL )
? V ?
? L ?
The R DS(on) temperature dependency should be
considered for the worst case operation. This is
Δ V o ( C ) =
Δ I L
8 * C o * F s
typically given in the MOSFET data sheet.
Ensure that the conduction losses and switching
losses do not exceed the package ratings or
violate the overall thermal budget.
Δ V o = Output voltage ripple
Δ I L = Inductor ripple current
For this design, IRF8910 is a good choice. The
device provides two N-MOSFETs in a compact
SO-8 package.
3/19/07
10
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PDF描述 |
|---|---|
| IR3640MPBF | IC REG CTRLR BUCK PWM VM 20-MLPQ |
| IR3651STRPBF | IC REG CTRLR BUCK PWM VM 14-SOIC |
| IR3710MTRPBF | IC REG CTRLR BUCK PWM 16-MLPQ |
| IR3720MTRPBF | IC POWER SUPPLY MONITOR 10-DFN |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IR3640MPBF | 功能描述:IC REG CTRLR BUCK PWM VM 20-MLPQ 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) |
| IR3640MTRPBF | 功能描述:开关变换器、稳压器与控制器 HI FREQ SYNC PWM 4.5 to 5.5V 1.5MHz 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 |
| IR3651 | 制造商:IRF 制造商全称:International Rectifier 功能描述: |
| IR3651SPBF | 功能描述:IC REG CTRLR BUCK PWM VM 14-SOIC 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) |
| IR3651STRPBF | 功能描述:电压模式 PWM 控制器 High Volt Sych PWM 100V 400Mhz 1.25 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 |
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