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参数资料
| 型号： | IR3628MPBF |
| 厂商： | International Rectifier |
| 文件页数： | 16/22页 |
| 文件大小： | 0K |
| 描述： | IC CTLR PWM BUCK SYNC 12-MLPD |
| 标准包装： | 122 |
| 应用： | 控制器，DDR |
| 输入电压： | 4.5 V ~ 14 V |
| 输出数： | 1 |
| 输出电压： | 0.6 V ~ 9.94 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 12-VFDFN 裸露焊盘 |
| 供应商设备封装： | 12-MLPD |
| 包装： | 管件 |
IR3628MP b F
Based on the frequency of the zero generated by
output capacitor and its ESR versus crossover
frequency, the compensation type can be
different. The table below shows the
compensation types and location of crossover
frequency.
The following design rules will give a crossover
frequency approximately one-tenth of the
switching frequency. The higher the band width,
the potentially faster the load transient response.
The DC gain will be large enough to provide high
DC-regulation accuracy (typically -5dB to -12dB).
The phase margin should be greater than 45 o for
Compensator
type
TypII(PI)
TypeIII(PID)
Method A
TypeIII(PID)
Method B
F ESR vs. F o
F LC <F ESR <F o <F s/2
F LC <F o <F ESR <F s/2
F LC <F o <F s/2 <F ESR
Output
capacitor
Electrolytic
, Tantalum
Tantalum,
ceramic
Ceramic
overall stability.
Desired Phase Margin:
1 ? Sin Θ
F Z 2 = F o *
1 + Sin Θ
F Z 2 = 16 kHz
Θ max =
π
3
F P 2 = F o *
Table1- The compensation type and location
of F ESR versus F o
The details of these compensation types are
discussed in application note AN-1043 which can
be downloaded from IR Web-Site.
1 + Sin Θ
1 ? Sin Θ
F P 2 = 224 kHz
Select : F Z1 = 0 . 5 * F Z 2 and F P3 = 0.5 * F s
For this design we have:
R 3 ≥
2
g m
; R 3 ≥ 2K Ω ; Select : R 3 = 8.06K Ω
C 4 =
; C 4 = 2.46nF, Select : C 4 = 2.2nF
C 3 =
; C 3 = 65 . 8 pF , Select : C 3 = 12 pF
V in =12V
V o =0.9V
V osc =1.25V
V ref =0.6V
g m =1000umoh
L o =0.36uH
C o =6x22uF, ESR=2mOhm
Note: Use 16.5uF instead of 22uF for calculation,
this is due to derating of ceramic capacitor
F s =600kHz
Calculate C 4 , C 3 and C 7 :
1
2 π * F Z1 * R 3
1
2 π * F P 3 * R 3
These result to:
C 7 =
2 π * F o * L o * C o * V osc * 1 . 28
R 3 * V in
; C 7 = 0 . 22 nF ,
F LC =26.6kHz
F ESR =4.8MHz
F s/2 =300kHz
Select crossover frequency:
Select : C 7 = 0 . 22 nF
Calculate R 10 , R 8 and R 9 :
F o < F ESR and F o ≤ ( 1/5 ~ 1/10 ) * F s
Fo=60kHz
Since: F LC <F o <F s/2 <F ESR , typeIII method B is
selected to place the pole and zeros.
R 10 =
R 8 =
1
2 π * C 7 * F P 2
1
2 π * C 7 * F Z 2
; R 10 = 3 . 23 K Ω , Select : R 10 = 3 . 24 K Ω
? R 10 ; R 8 = 41 . 76 K Ω , Select : R 8 = 42 . 20 K Ω
08/10/2007
R 9 =
V ref
V o ? V ref
* R 8 ; R 9 = 84 . 40 K Ω , Select : R 9 = 84 . 50 K Ω
16
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相关代理商/技术参数 |
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| IR3628MTRPBF | 功能描述:电压模式 PWM 控制器 HI FREQ SYNC PWM 600kHz 5 or 12V 0.6 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 |
| IR3629 | 制造商:IRF 制造商全称:International Rectifier 功能描述:HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER WITH POWER GOOD OUTPUT |
| IR3629A | 制造商:IRF 制造商全称:International Rectifier 功能描述:HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER WITH POWER GOOD OUTPUT |
| IR3629AMPBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER WITH POWER GOOD OUTPUT |
| IR3629AMTRPBF | 功能描述:电压模式 PWM 控制器 HI FREQ SYNC PWM 600kHz 5 or 12V 0.6 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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