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| 型号： | IR3640MTRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 21/32页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 20-MLPQ |
| 标准包装： | 3,000 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1.65MHz |
| 占空比： | 92% |
| 电源电压： | 4.5 V ~ 5.5 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 20-VFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
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IR3640MPBF
F ESR vs F o
Table 2 The compensation type and location
of F ESR versus F o
Compensator Output
Type Capacitor
These result to:
F LC =18.3kHz
F ESR =2306kHz
F s/2 =300kHz
Select crossover frequency:
Type II
Type III
F LC <F ESR <F o <F s /2
F LC <F o <F ESR
Electrolytic
Tantalum
Tantalum
Ceramic
Fo=100kHz
Since: F LC <F o <F S/2 <F ESR , TypeIII is selected to
place the pole and zeros. Detailed calculation of
compensation TypeIII:
Desired Phase Margin Θ = 70 o
The higher the crossover frequency, the
potentially faster the load transient response.
F Z 2 = F o
1 ? sin Θ
1 + sin Θ
= 17.63 kHz
However, the crossover frequency should be low
enough to allow attenuation of switching noise.
Typically, the control loop bandwidth or
crossover frequency is selected such that
F P 2 = F o
1 + sin Θ
1 ? sin Θ
= 567.1 kHz
2 π * F o * L o * C o * V osc
F o ≤ ( 1/5 ~ 1/10 ) * F s
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 =0.7V
L o =0.33uH
C o =10x47uF(ceramic)
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
Select : F Z 1 = 0 . 5 * F Z 2 = 8.82 kHz and
F P 3 = 0.5 * F s = 300 kHz
Select : C 7 = 2.2 nF
Calculate R 3 , C 3 and C 4 :
R 3 = ; R 3 = 3.25 k Ω
C 7 * V in
Select : R 3 = 3.24 k Ω
small signal capacitance of the 47uF capacitor
used in this design is 23uF at 1.8 V DC bias and
600 kHz frequency. It is this value that must be
used for all computations related to the
C 4 =
1
2 π * F Z 1 * R 3
; C 4 = 5 . 57 nF, Select : C 4 = 5 . 6 nF
C 3 =
; C 3 = 163 . 74 pF , Select : C 3 = 160 pF
R 10 =
; R 10 = 130 Ω , Select : R 10 = 130 Ω
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 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 .
06/15/2009
1
2 π * F P 3 * R 3
Calculate R 10 , R 8 and R 9 :
1
2 π * C 7 * F P 2
21
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相关代理商/技术参数 |
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|---|---|
| IR3651 | 制造商:IRF 制造商全称:International Rectifier 功能描述: |
| IR3651SPBF | 功能描述:IC REG CTRLR BUCK PWM VM 14-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| IR3651STRPBF | 功能描述:电压模式 PWM 控制器 High Volt Sych PWM 100V 400Mhz 1.25 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 |
| IR3651STRPBF-CUT TAPE | 制造商:IR 功能描述:IR3651SPbF Series 13.2 V 7 mA High Voltage Synchronous PWM Buck Controller |
| IR367319 | 制造商:Thomas & Betts 功能描述:CONNECTOR |
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