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参数资料
| 型号： | IRU3037CFPBF |
| 厂商： | International Rectifier |
| 文件页数： | 8/21页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 8-TSSOP |
| 标准包装： | 100 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 220kHz |
| 占空比： | 95% |
| 电源电压： | 4.2 V ~ 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： | 0°C ~ 70°C |
| 封装/外壳： | 8-TSSOP（0.173"，4.40mm 宽） |
| 包装： | 管件 |
IRU3037/IRU3037A & (PbF)
2 π × ESR × Co
Note that this method requires that the output capacitor
should have enough ESR to satisfy stability requirements.
In general the output capacitor’s ESR generates a zero
typically at 5KHz to 50KHz which is essential for an
acceptable phase margin.
The ESR zero of the output capacitor expressed as fol-
lows:
1
F ESR = ---(8)
V OUT
Where:
V IN = Maximum Input Voltage
V OSC = Oscillator Ramp Voltage
Fo = Crossover Frequency
F ESR = Zero Frequency of the Output Capacitor
F LC = Resonant Frequency of the Output Filter
R 5 and R 6 = Resistor Dividers for Output Voltage
Programming
g m = Error Amplifier Transconductance
For:
V IN = 5V
V OSC = 1.25V
R 6
R 5
Fb
E/A
Comp
C 9
Ve
Fo = 30KHz
F ESR = 26.52KHz
F LC = 2.9KHz
R 5 = 1K
R 6 = 1.65K
V REF
Gain(dB)
H(s) dB
R 4
g m = 600 μ mho
This results to R 4 =104.4K ? . Choose R 4 =105K ?
To cancel one of the LC filter poles, place the zero be-
fore the LC filter resonant frequency pole:
F Z
Frequency
Figure 6 - Compensation network without local
feedback and its asymptotic gain plot.
F Z ? 75%F LC
F Z ? 0.75 ×
For:
2 π
1
L O × C O
---(13)
The transfer function (Ve / V OUT ) is given by:
Lo = 10 μ H
Co = 300 μ F
(
) × 1 + sC sR C
H(s) = g m ×
R 5
R 6 + R 5
4 9
9
---(9)
F Z = 2.17KHz
R 4 = 86.6K ?
Using equations (11) and (13) to calculate C 9 , we get:
The (s) indicates that the transfer function varies as a
function of frequency. This configuration introduces a gain
and zero, expressed by:
C 9 = 698pF
Choose C 9 = 680pF
|H(s)| = g m ×
R 5
R 6 × R 5
× R 4
---(10)
One more capacitor is sometimes added in parallel with
C 9 and R 4 . This introduces one more pole which is mainly
F Z =
1
2 π× R 4 × C 9
---(11)
used to supress the switching noise. The additional pole
is given by:
1
The gain is determined by the voltage divider and E/A's
transconductance gain.
F P =
2 π × R 4 ×
C 9 × C POLE
C 9 + C POLE
First select the desired zero-crossover frequency (Fo):
Fo > F ESR and F O ≤ (1/5 ~ 1/10) × f S
The pole sets to one half of switching frequency which
results in the capacitor C POLE:
× × g m
R 4 = ×
Use the following equation to calculate R 4 :
V OSC Fo × F ESR R 5 + R 6 1
V IN F LC2 R 5
---(12)
1
C POLE =
π× R 4 × f S - 1
C 9
f S
for F P <<
2
?
1
π× R 4 × f S
8
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IRU3037CFTR | 功能描述:IC REG CTRLR BUCK PWM VM 8-TSSOP RoHS:否 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) |
| IRU3037CFTRPBF | 功能描述:电压模式 PWM 控制器 8 PWM 200 KHZ 200kHz Synch CTRL 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 |
| IRU3037CS | 功能描述:IC REG CTRLR BUCK PWM VM 8-SOIC RoHS:否 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) |
| IRU3037CSPBF | 功能描述:IC REG CTRLR BUCK PWM VM 8-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) |
| IRU3037CSTR | 功能描述:电压模式 PWM 控制器 8 PWM 200 KHZ 200kHz Synch CTRL 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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