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| 型号： | IR3876MTRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 16/21页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 12A 17QFN |
| 产品培训模块： | SupIRBuck? Family and POL Design Tools Overview |
| 标准包装： | 4,000 |
| 系列： | SupIRBuck™ |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.5 V ~ 12 V |
| 输入电压： | 3 V ~ 21 V |
| 频率 - 开关： | 可调至 1MHz |
| 电流 - 输出： | 12A |
| 同步整流器： | 是 |
| 工作温度： | 0°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 17-PowerVQFN |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | PQFN（5x6） |
IR3876MPBF
DESIGN EXAMPLE
Design Criteria:
Input Voltage, VIN, = 7V to 16V
Output Voltage, VOUT = 1.05V
Switching Frequency, Fs = 300KHz
Choose an inductor with the lowest DCR and
AC power loss as possible to increase the
overall system efficiency. For instance, choose
MPL1055-1R21R manufactured by Delta. The
inductance of this part is 1.2μH and has 2.9 mΩ
DCR. Ripple current needs to be recalculated
using the chosen inductor.
Inductor Ripple Current, 2ΔI = 3A
Maximum Output Current, IOUT = 12A
Over Current Trip, IOC = 18A
ΔI ?
1.05 V ? ? 1 6 V - 1.05 V ?
2 ? 1 6 V ? 1 . 2 ? H ? 300k Hz
? 1.36 A
Overshoot Allowance, VOS = VOUT + 50mV
Undershoot Allowance, VDROP = 50mV
Choose an input capacitor:
R FF ?
? 1 ? ? ?
?
Find R FF :
1.05 V
1 V ? 20 pF ? 300k Hz
? 175 k ?
I IN_RMS ? 1 2 A ?
1.05V
16 V
1 ? 1.36 A ?
3 ? 1 2 A ?
2
Pick a standard value 178 kΩ, 1% resistor.
? 3.1 A
Find R SET :
A
Panasonic
10μF
(ECJ3YB1E106M)
R SET ?
1.4 ? 5 . 2 m ? ? 18 A
20 ? A
? 6.55 k ?
accommodates 6 Arms of ripple current at
300KHz. Due to the chemistry of multilayer
ceramic capacitors, the capacitance varies over
temperature and operating voltage, both AC and
The R DSON of the lower MOSFET could be
expected to increase by a factor of 1.4 over
DC. One 10μF capacitor is recommended. In a
practical solution, one 1μF capacitor is required
temperature.
Therefore, pick a 6.65 kΩ, 1%
along with the 10μF. The purpose of the 1μF
standard resistor.
capacitor is to suppress the switching noise and
deliver high frequency current.
Find a resistive voltage divider for V OUT = 1.05V:
V FB ?
R 2
R 2 ? R 1
? V OUT ? 0.5 V
Choose an output capacitor:
To meet the undershoot specification, select a
V OUT ? ? V IN ? V OUT ?
1.05 V ? ? 1 6 V - 1.05 V ?
R 2 = 2.55k Ω , R 1 = 2.80kΩ, both 1% standard
resistors .
Choose the soft start capacitor:
Once the soft start time has chosen, such as
1000us to reach to the reference voltage, a 22nF
for C SS is used to meet 1000μs.
Choose an inductor to meet the design
specification:
L ?
V IN ? 2 ΔI ? F s
?
1 6 V ? 3 A ? 300k Hz
set of output capacitors which has an equivalent
ESR of 10 mΩ (50mV/5A). To meet the
overshoot specification, equation 7 will be used
to calculate the minimum output capacitance. As
a result, 300μF will be needed for 5A load
removal. Combine those two requirements, one
can choose a set of output capacitors from
manufactures such as Sanyo or Rubycon. A
330μF (2SWZ330M R05) from Rubycon is
recommended. This capacitor has 4.5 mΩ ESR
which leaves margin for the voltage drop of the
ESL during load step up.
? 1.1 ? H
16
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IR3876TR1PBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:12A HIGHLY INTEGRATED WIDE-INPUT VOLTAGE, SYNCHRONOUS BUCK REGULATOR |
| IR3891 | 制造商:IRF 制造商全称:International Rectifier 功能描述:Dual output, 4A/Phase, Highly Integrated SupIRBuck |
| IR3891MPBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:Dual output, 4A/Phase, Highly Integrated SupIRBuck |
| IR3891MTR1PBF | 功能描述:直流/直流开关调节器 4A Phase Dual Reg Single 5V to 21V PWM 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:2 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:PQFN 5 x 6 |
| IR3891MTRPBF | 制造商:International Rectifier 功能描述:Dual Output 4 A/Phase 1 to 21 V 1.5 MHz Synchronous Buck Regulator-PQFN 5 x 6 mm |
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