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参数资料
| 型号： | IR3870MTRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 14/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 10A 15QFN |
| 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 ~ 26 V |
| 频率 - 开关： | 可调至 1MHz |
| 电流 - 输出： | 10A |
| 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： | 16-PowerVQFN |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | PQFN（5x6） |
IR3870MPBF
Output Capacitor Selection
Selection of the output capacitor requires
meeting voltage overshoot requirements during
load removal, and meeting steady state output
ripple voltage requirements. The output
capacitor is the most expensive converter
component and increases the overall system
cost. The output capacitor decoupling in the
converter typically includes the low frequency
capacitor, such as Specialty Polymer Aluminum,
and mid frequency ceramic capacitors.
VESR is usually much greater than VESL. The
IR3870 requires a total ESR such that the ripple
voltage at the FB pin is greater than 7mV.
The second purpose of the output capacitor is to
minimize the overshoot of the output voltage
when the load decreases as shown in Figure 18.
By using the law of energy before and after the
load removal, equation 7 shows the output
capacitance requirement for a load step.
L ? I STEP
The first purpose of output capacitors is to
provide current when the load demand exceeds
the inductor current, as shown in Figure 17.
Equation 6 shows the charge requirement for a
C OUT ?
2
V OS 2 ? V OUT
2
(7)
certain load. The advantage provided by the
IR3870 at a load step is to reduce the delay
compared to a fixed frequency control method (in
microseconds or (1-D)*Ts). If the load increases
right after the PWM signal goes low, the longest
delay will be equal to the minimum lower gate on
as shown in the Electrical Specification table.
The IR3870 also reduces the inductor current
slew time, the time it takes for the inductor
current to reach equality with the output current,
by increasing the switching frequency up to
2.5MHz. The result reduces the recovery time.
Figure 18. Typical Output Voltage Response
Waveform.
Figure 17. Charge Requirement during Load Step
Q ? C ? V ? 0.5 ? Istep ? ? t
(6a)
1 ? 1 L ? Δ Istep 2 ?
V DROP ? ? 2 ? V IN ? V OUT ? ? ?
C OUT ?
? ? ? (6b)
The output voltage drops, VDROP, initially
depending on the characteristic of the output
capacitor. VDROP is the sum of the equivalent
series inductance (ESL) of the output capacitor
times the rate of change of the output current and
the ESR times the change of the output current.
14
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IR3871MPBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:8A HIGHLY INTEGRATED WIDE-INPUT VOLTAGE, SYNCHRONOUS BUCK REGULATOR |
| IR3871MTR1PBF | 功能描述:直流/直流开关调节器 8A SupIRBuck Reg 1000kHz, 3.0-26V in 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: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| IR3871MTRPBF | 功能描述:直流/直流开关调节器 8A SupIRBuck Reg 1000kHz, 3.0-26V in 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: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| IR3876MBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:12A HIGHLY INTEGRATED WIDE-INPUT VOLTAGE, SYNCHRONOUS BUCK REGULATOR |
| IR3876MPBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:12A HIGHLY INTEGRATED WIDE-INPUT VOLTAGE, SYNCHRONOUS BUCK REGULATOR |
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