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参数资料
| 型号： | IRU3037CS |
| 厂商： | International Rectifier |
| 文件页数： | 9/21页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 8-SOIC |
| 标准包装： | 95 |
| 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-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 其它名称： | *IRU3037CS |
IRU3037/IRU3037A & (PbF)
For a general solution for unconditionally stability for any
F P1 = 0
Z IN
( )
2 π× R 7 ×
type of output capacitors, in a wide range of ESR values
we should implement local feedback with a compensa-
tion network. The typically used compensation network
for voltage-mode controller is shown in Figure 7.
V OUT
C 12
F P2 =
F P3 =
1
2 π× R 8 × C 10
1
C 12 × C 11
C 12 +C 11
?
1
2 π× R 7 × C 12
C 10
R 7
C 11
F Z1 =
1
2 π× R 7 × C 11
F Z2 = 2 π× C 10 × (R 6 + R 8 ) ?
R 8
R 6
Z f
1
1
2 π× C 10 × R 6
R 5
Fb
E/A
Comp
Ve
Cross Over Frequency:
×
Gain(dB)
V REF
F O = R 7 × C 10 ×
V IN
V OSC
1
2 π× Lo × Co
---(15)
Where:
H(s) dB
V IN = Maximum Input Voltage
V OSC = Oscillator Ramp Voltage
Lo = Output Inductor
Co = Total Output Capacitors
F Z 1
F Z 2
F P 2
F P 3
Frequency
The stability requirement will be satisfied by placing the
Figure 7 - Compensation network with local
feedback and its asymptotic gain plot.
In such configuration, the transfer function is given by:
poles and zeros of the compensation network according
to following design rules. The consideration has been
taken to satisfy condition (14) regarding transconduc-
tance error amplifier.
V e
V OUT
=
1 - g m Z f
1 + g m Z IN
1) Select the crossover frequency:
Fo < F ESR and Fo ≤ (1/10 ~ 1/6) × f S
g m
[ ( )]
× (1+sR 8 C 10 )
sR 6 (C 12 +C 11 ) C 12 × C 11
2 π × F Z1 × R 7
2 π × R 7 × F P3
The error amplifier gain is independent of the transcon-
ductance under the following condition:
g m Z f >> 1 and g m Z IN >>1 ---(14)
By replacing Z IN and Z f according to Figure 7, the trans-
former function can be expressed as:
1 (1+sR 7 C 11 ) × [1+sC 10 (R 6 +R 8 )]
H(s)= ×
1+sR 7
C 12 +C 11
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
2
2) Select R 7 , so that R 7 >>
3) Place first zero before LC’s resonant frequency pole.
F Z1 ? 75% F LC
1
C 11 =
4) Place third pole at the half of the switching frequency.
f S
F P3 =
2
1
C 12 =
C 12 > 50pF
If not, change R 7 selection.
necessary range.
5) Place R 7 in (15) and calculate C 10 :
The compensation network has three poles and two ze-
ros and they are expressed as follows:
C 10 ≤
2 π × Lo × Fo × Co
R 7
×
V OSC
V IN
www.irf.com
9
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| 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 |
| IRU3037CSTRPBF | 功能描述:开关变换器、稳压器与控制器 8 PWM 200 KHZ 200kHz Synch CTRL 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 |
| IRU3038 | 制造商:IRF 制造商全称:International Rectifier 功能描述:SYNCHRONOUS PWM CONTROLLER FOR TERMINATION POWER SUPPLY APPLICATIONS |
| IRU3038CF | 功能描述:IC REG CTRLR BUCK PWM VM TSSOP14 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:2,000 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:1MHz 占空比:50% 电源电压:9 V ~ 10 V 降压:无 升压:是 回扫:是 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:8-TSSOP（0.173"，4.40mm 宽） 包装:带卷 (TR) |
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