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参数资料
| 型号： | IR3638STRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 12/15页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 14-SOIC |
| 标准包装： | 1 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 440kHz |
| 占空比： | 95% |
| 电源电压： | 5 V ~ 13.2 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： | 0°C ~ 125°C |
| 封装/外壳： | 14-SOIC（0.154"，3.90mm 宽） |
| 包装： | 标准包装 |
| 产品目录页面： | 1384 (CN2011-ZH PDF) |
| 其它名称： | IR3638STRPBFDKR |
IR3638SP b F
The ESR zero of the output capacitor expressed
as follows:
To cancel one of the LC filter poles, place the
zero before the LC filter resonant frequency pole:
F z = 0 . 75 *
V OUT
F ESR =
1
2 ? π * ESR * C o
- - - (9)
F z = 75 % F LC
1
2 π L o * C o
- - - (14)
R 1
Fb
Using equations (15) and (16) to calculate C9.
R 2
V REF
E/A
Comp
C 4
R 3
Ve
C POLE
One more capacitor is sometimes added in
parallel with C4 and R3. This introduces one
more pole which is mainly used to suppress the
switching noise.
Gain(dB)
The additional pole is given by:
2 π * R 3 * 4
H(s) dB
F P =
1
C * C POLE
C 4 + C POLE
F Z
Frequency
The pole sets to one half of switching frequency
which results in the capacitor C POLE :
Fig. 11: TypeII compensation network
and its asymptotic gain plot
The transfer function (Ve/Vo) is given by:
C POLE =
1
π * R 3 * F s ?
1
C 4
?
1
π * R 3 * F s
- - - (15)
H ( s ) = ? ? g m *
R 9 ? 1 + sR 3 C 4
R 9 8 ? ?
For F P <<
?
?
+ R sC 4
? *
- - - (10)
F s
2
Based on the frequency of the zero generated by
The (s) indicates that the transfer function varies
output capacitor and its ESR versus crossover
as a function of frequency. This configuration
frequency, the compensation type can be
introduces a gain and zero, expressed by:
different. The table below shows the
[ H ( s ) ] = ? g m
? * R 3 - - - (11)
?
*
R 9 ?
?
R 9 + R 8 ?
compensation types and location of crossover
frequency.
F z =
- - - (12)
1
2 π * R 3 * C 4
The gain is determined by the voltage divider and
Compensator
type
TypII(PI)
F ESR vs. F o
F LC <F ESR <F o <F s/2
Output
capacitor
Electrolytic
, Tantalum
error amplifier’s transconductance gain.
First select the desired zero-crossover frequency
(Fo):
F o > F ESR and F o ≤ ( 1/5 ~ 1/10 ) * F s
TypeIII(PID)
Method A
TypeIII(PID)
Method B
F LC <F o <F ESR <F s/2
F LC <F o <F s/2 <F ESR
Tantalum,
ceramic
Ceramic
Use the following equation to calculate R3:
R 3 = osc o
V in * F LC * R 2 * g m
V * F * F ESR * ( R 1 + R 2 )
2
Where:
V in = Maximum Input Voltage
V osc = Oscillator Ramp Voltage
- - - (13)
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.
F o = Crossover Frequency
F ESR = Zero Frequency of the Output Capacitor
F LC = Resonant Frequency of the Output Filter
R 1 and R 2 = Feedback Resistor Dividers
g m = Error Amplifier Transconductance
3/19/07
12
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相关代理商/技术参数 |
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| IR3640MPBF | 功能描述:IC REG CTRLR BUCK PWM VM 20-MLPQ 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) |
| IR3640MTRPBF | 功能描述:开关变换器、稳压器与控制器 HI FREQ SYNC PWM 4.5 to 5.5V 1.5MHz RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| 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 |
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