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参数资料
| 型号： | IR3638STRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 9/15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
Application Information
Soft-Start Programming
Design Example:
The following is a design of typical application for
IR3638. The application circuit is shown on page
14.
The soft-start timing can be programmed by
selecting the soft-start capacitance value. The
start-up time of the converter can be calculated
by using:
C SS ? 22 μ A * T start --( 1 )
V in = 5 V
V cc = V c = 12 V
V p = 1 V
V o = 1 . 2 V
I o = 6 A
Δ V o ≤ 30 mV
Where T start is the desired start-up time (ms)
For a start-up time of 5ms, the soft-start
capacitor will be 0.1uF. Choose a ceramic
capacitor at 0.1uF.
Input Capacitor Selection
The input filter capacitor should be selected
Output Voltage Programming
based on how much ripple the supply can
tolerate on the DC input line. The ripple current
Output voltage is programmed by Vp voltage and
generated during the on time of upper MOSFET
external voltage divider. The Fb pin is the
should be provided by input capacitor. The RMS
inverting input of the error amplifier, which is
value of this ripple is expressed by:
externally referenced to Vp. The divider is set to
provide a voltage equal to Vp (in this case 1V)
I RMS = I o ? D ? ( 1 ? D )
--( 4 )
when the output is at its desired value. The
V o p ? ? ? 1 + 1 ? ?
= V
V o
D =
V in
output voltage is defined by using the following
equation:
? R ?
--( 2 )
? R 2 ?
Where:
D is the Duty Cycle
I RMS is the RMS value of the input capacitor
When an external resistor divider is connected to
current.
the output as shown in figure 8.
Io is the output current.
For Io=6A and D=0.24, the I RMS =2.6A.
V OUT
Ceramic capacitors are recommended due to
IR3638
Fb
R 1
R 2
their peak current capabilities, they also feature
low ESR and ESL at higher frequency which
enhance better efficiency,
Use two 10uF, 16V ceramic capacitor from
Panasonic.
Fig. 8: Typical application of the IR3638 for
Inductor Selection
programming the output voltage
The inductor is selected based on output power,
operating frequency and efficiency requirements.
Equation (2) can be rewritten as:
Low inductor value causes large ripple current,
resulting in the smaller size, faster response to a
load transient but poor efficiency and high output
R 2 1 ? ? ?
? V p ?
? V ?
= R ?
? V O p ?
--( 3 )
noise. Generally, the selection of inductor value
can be reduced to desired maximum ripple
current in the inductor ( Δ i ) . The optimum point is
usually found between 20% and 50% ripple of
Select R1 =1kOhm, this will result in R2=5kOhm.
the output current.
Select the closest Standard value of 4.99kOhm.
3/19/07
9
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相关代理商/技术参数 |
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|---|---|
| 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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