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参数资料
| 型号： | IR3856MTRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 22/35页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 6A 17PQFN |
| 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： | 0.7 V ~ 18.9 V |
| 输入电压： | 1.5 V ~ 21 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 225kHz ~ 1.65MHz |
| 电流 - 输出： | 6A |
| 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-PowerVQFN |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 17-PQFN（4x5） |
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PD-97528
IR3856MPbF
Where:
V in = Maximum Input Voltage
V osc = Oscillator Ramp Voltage
F o = Crossover Frequency
F ESR = Zero Frequency of the Output Capacitor
F LC = Resonant Frequency of the Output Filter
R 8 = Feedback Resistor
To cancel one of the LC filter poles, place the
zero before the LC filter resonant frequency pole:
F z = 0 . 75 *
F z = 75 % F LC
1
2 π L o * C o
.......... .......... .......... ....... (23)
Use equations (21), (22) and (23) to calculate
C4.
One more capacitor is sometimes added in
parallel with C4 and R3. This introduces one
V e Z 1 + sR 3 C 4
F P =
.......... .......... .......... .(24)
2 π * R 3 *
H ( s ) =
R 3
C POLE =
?
.......... .......... .. (25)
π *R 3 *F s
π *R 3 *F s ?
Fig. 15. Type II compensation network
and its asymptotic gain plot
The transfer function ( V e /V o ) is given by:
= H ( s ) = ? f = ? ..... (19)
V o Z IN sR 8 C 4
The (s) indicates that the transfer function varies
as a function of frequency. This configuration
introduces a gain and zero, expressed by:
......... .......... .......... ......... (20)
R 8
more pole which is mainly used to suppress the
switching noise.
The additional pole is given by:
1
C 4 * C POLE
C 4 + C POLE
The pole sets to one half of the switching
frequency which results in the capacitor C POLE :
1 1
1
C 4
For a general solution for unconditional stability
F z =
1
2 π * R 3 * C 4
.......... .......... ........ (21)
for any type of output capacitors, and a wide
range of ESR values, we should implement local
feedback with a Type-III compensation network.
V e Z f
First select the desired zero-crossover frequency
( F o ):
F o > F ESR and F o ≤ ( 1/5 ~ 1/10 ) * F s
Use the following equation to calculate R3:
The typically used compensation network for
voltage-mode controller is shown in figure 16.
Again, the transfer function is given by:
= H ( s ) = ?
V o Z IN
V in *
F LC
? ( 1 + sR 3 C 4 ) [ 1 + sC 7 ( R 8 + R 10 ) ]
? C 4 * C 3 ? ?
sR 8 ( C 4 + C 3 ) ? 1 + sR 3 ? ?
? ? ? ( 1 + sR 10 C 7 )
R 3 =
V osc * F o * F ESR * R 8
2
.......... .......... ....... (22)
By replacing Z in and Z f according to figure 16,
the transfer function can be expressed as:
H ( s ) =
?
? ?
? ? C 4 + C 3 ? ?
....... (26)
Rev 4.0
22
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IR3856WMPBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:HIGHLY EFFICIENT INTEGRATED 6A, SYNCHRONOUS BUCK REGULATOR |
| IR3856WMTR1PBF | 功能描述:直流/直流开关调节器 6A SupIRBuck Reg 750kHz, 1.5-16V 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 |
| IR3856WMTRPBF | 功能描述:直流/直流开关调节器 6A SupIRBuck Reg 750kHz, 1.5-16V 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 |
| IR3859MPBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:HIGHLY EFFICIENT INTEGRATED 9A, SYNCHRONOUS BUCK REGULATOR |
| IR3859MTR1PBF | 功能描述:直流/直流开关调节器 9A SupIRBuck Reg 250-1500kHz, 1.5-21V 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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