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| 型号： | IRU3137CSTRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 11/19页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 8-SOIC |
| 标准包装： | 2,500 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 240kHz |
| 占空比： | 90% |
| 电源电压： | 4.25 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-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
IRU3137
For a general solution for unconditionally stability for
F P1 = 0
( C C × +C C )
2 π× R 7 ×
ceramic capacitor with very low ESR and any type of
output capacitors, in a wide range of ESR values we
should implement local feedback with a compensation
network. The typically used compensation network for
voltage-mode controller is shown in Figure 10.
F P2 =
F P3 =
1
2 π× R 8 × C 10
1
12 11
12 11
?
1
2 π× R 7 × C 12
Z IN
V OUT
C 12
F Z1 =
1
2 π× R 7 × C 11
F Z2 = 2 π× C 10 × (R 6 + R 8 ) ?
C 10
R 8
R 6
R 7
C 11
Z f
1
1
2 π× C 10 × R 6
Cross Over Frequency:
R 5
Fb
E/A
Comp
Ve
F O = R 7 × C 10 ×
V IN
V OSC
×
1
2 π× Lo × Co
---(21)
Gain(dB)
H(s) dB
Vp=V REF
Where:
V IN = Maximum Input Voltage
V OSC = Oscillator Ramp Voltage
Lo = Output Inductor
Co = Total Output Capacitors
The stability requirement will be satisfied by placing the
F Z 1
F Z 2
F P 2
F P 3
Frequency
poles and zeros of the compensation network according
to following design rules. The consideration has been
Figure 10 - Compensation network with local
feedback and its asymptotic gain plot.
In such configuration, the transfer function is given by:
taken to satisfy condition (20) regarding transconduc-
tance error amplifier.
These design rules will give a crossover frequency ap-
V e
V OUT
=
1 - g m Z f
1 + g m Z IN
proximately one-tenth of the switching frequency. The
higher the band width, the potentially faster the load tran-
sient speed. The gain margin will be large enough to
The error amplifier gain is independent of the transcon-
ductance under the following condition:
provide high DC-regulation accuracy (typically -5dB to -
12dB). The phase margin should be greater than 45 for
g m Z f >> 1
and
g m Z IN >>1
---(20)
overall stability.
By replacing Z IN and Z f according to Figure 7, the trans-
former function can be expressed as:
Based on the frequency of the zero generated by ESR
versus crossover frequency, the compensation type can
( )]
1+sR 7 C 12 +C 11
H(s) =
1
sR 6 (C 12 +C 11 )
×
[
(1+sR 7 C 11 ) × [1+sC 10 (R 6 +R 8 )]
C 12 C 11
× (1+sR 8 C 10 )
be different. The table below shows the compensation
type and location of crossover frequency.
Compensator Location of Zero Typical
Type Crossover Frequency Output
As known, transconductance amplifier has high imped-
ance (current source) output, therefore, consider should
be taken when loading the E/A output. It may exceed its
source/sink output current capability, so that the ampli-
fier will not be able to swing its output voltage over the
necessary range.
Type II (PI)
Type III (PID)
Method A
Type III (PID)
Method B
(F O )
F PO < F ZO < F O < f S /2
F PO < F O < F ZO < f S /2
F PO < F O < f S /2 < F ZO
Capacitor
Electrolytic,
Tantalum
Tantalum,
Ceramic
Ceramic
The compensation network has three poles and two ze-
ros and they are expressed as follows:
www.irf.com
Table - The compensation type and location of zero
crossover frequency.
Detail information is dicussed in application Note AN-
1043 which can be downloaded from the IR Web-Site.
11
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相关代理商/技术参数 |
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|---|---|
| IRU3138 | 制造商:IRF 制造商全称:International Rectifier 功能描述:SYNCHRONOUS PWM CONTROLLER FOR TERMINATION POWER SUPPLY APPLICATIONS |
| IRU3138CS | 制造商:IRF 制造商全称:International Rectifier 功能描述:SYNCHRONOUS PWM CONTROLLER FOR TERMINATION POWER SUPPLY APPLICATIONS |
| IRU3138CSTR | 功能描述:IC REG CTRLR BUCK PWM VM 14-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) |
| IRU3138CSTRPBF | 功能描述:电压模式 PWM 控制器 SYNC PWM CTRLLER 1A .8V 200 to 400kHz 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 |
| IRU3146 | 制造商:IRF 制造商全称:International Rectifier 功能描述:DUAL SYNCHRONOUS PWM CONTROLLER WITH CURRENT SHARING CIRCUITRY AND AUTO-RESTART |
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