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| 型号： | IR3837MTR1PBF |
| 厂商： | International Rectifier |
| 文件页数： | 25/36页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 14A PQFN17 |
| 产品培训模块： | SupIRBuck? Family and POL Design Tools Overview |
| 标准包装： | 1 |
| 系列： | SupIRBuck™ |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.6 V ~ 14.4 V |
| 输入电压： | 1.5 V ~ 16 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 225kHz ~ 1.65MHz |
| 电流 - 输出： | 14A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 17-VQFN |
| 包装： | 标准包装 |
| 供应商设备封装： | 17-PQFN（5x6） |
| 其它名称： | IR3837MTR1PBFDKR |
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IR3837MPbF
Again, the transfer function is given by:
Table 3. Different types of compensators
V e
V out
? H ( s ) ? ?
Z f
Z IN
Compensator
Type
Type II
Type III
F ESR vs F 0
F LC < F ESR < F 0 < F S /2
F LC < F 0 < F ESR
Typical Output
Capacitor
Electrolytic
SP-Cap, Ceramic
By replacing Z in and Z f according to figure 20,
the transfer function can be expressed as:
The higher the crossover frequency is, the
? C * C 3 ? ?
sR 8 ( C 4 ? C 3 ) ? 1 ? sR 3 ? 4 ? ? ( 1 ? sR 10 C 7 )
H ( s ) ?
?
( 1 ? sR 3 C 4 ) ? 1 ? sC 7 ? R 8 ? R 10 ? ?
?
? ?
? ? C 4 ? C 3 ? ?
.... (26)
potentially faster the load transient response will
be. However, the crossover frequency should be
low enough to allow attenuation of switching
noise. Typically, the control loop bandwidth or
crossover frequency ( F o ) is selected such that
F o ? ? 1/5 ~ 1/10 ? * F s
F P 2 ?
1
F P 3 ?
?
1 1
2 π * R 3 ? ?
? ?
F Z 1 ?
1
F Z 2 ?
?
1 1
The compensation network has three poles and
two zeros and they are expressed as follows:
F P 1 ? 0 .......... .......... .......... .......... .......... .......... ......(27)
.......... .......... .......... .......... .......(28 )
2 π * R 10 * C 7
.......... ..... (29)
? C 4 * C 3 ? 2 π * R 3 * C 3
? C 4 ? C 3 ?
.......... .......... .......... .......... .....(30)
2 π * R 3 * C 4
.......... (31)
2 π * C 7 * ( R 8 ? R 10 ) 2 π * C 7 * R 8
Cross over frequency is expressed as:
The DC gain should be large enough to provide
high DC-regulation accuracy. The phase margin
should be greater than 45 o for overall stability.
For this design we have:
V in =12V
V o =1.8V
V osc =1.8V
V ref =0.6V
L o =0.51uH
C o =7x47uF, ESR ≈ 3m ? each
It must be noted here that the value of the
capacitance used in the compensator design
must be the small signal value. For instance, the
small signal capacitance of the 47uF capacitor
used in this design is 26uF at 1.8 V DC bias and
600 kHz frequency. It is this value that must be
used for all computations related to the
V in 1
F o ? R 3 * C 7 *
*
V osc 2 π * L o * C o
.......... .......... .......... .. (32)
compensation. The small signal value may be
obtained from the manufacturer’s datasheets,
design tools or SPICE models. Alternatively, they
may also be inferred from measuring the power
Based on the frequency of the zero generated by
the output capacitor and its ESR, relative to
crossover frequency, the compensation type can
be different. Table 3 shows the compensation
types for relative locations of the crossover
frequency.
Rev 1.31
stage transfer function of the converter and
measuring the double pole frequency F LC and
using equation (16) to compute the small signal
C o .
These result to:
F LC =16.5 kHz
F ESR =2.04 MHz
F s /2 =300 kHz
25
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IR3837MTR1PBF | 制造商:International Rectifier 功能描述:IC DC-DC CONV 1.5 MHz QFN-17 制造商:International Rectifier 功能描述:IC, DC-DC CONV, 1.5 MHz, QFN-17 |
| IR3837MTR1PBF-CUT TAPE | 制造商:IR 功能描述:IR3837 Series 1.5 MHz 14 A Surface Mount Synchronous Buck Regulator - QFN-16 |
| IR3837MTRPBF | 功能描述:直流/直流开关调节器 14A SupIRBuck Reg 250-1500kHz, 1.5-16V 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 |
| IR3838MPBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:HIGHLY INTEGRATED 10A SINGLE-INPUT VOLTAGE, SYNCHRONOUS BUCK REGULATOR |
| IR3838MTR1PBF | 功能描述:直流/直流开关调节器 10A SupIRBuck Reg 250-1500kHz, 1.5-16V 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 |
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