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| 型号： | IR3623MTRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 20/27页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 32MLPQ |
| 标准包装： | 1 |
| PWM 型： | 电压模式 |
| 输出数： | 2 |
| 频率 - 最大： | 1.2MHz |
| 占空比： | 85% |
| 电源电压： | 8.5 V ~ 14.5 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： | 32-VFQFN 裸露焊盘 |
| 包装： | 标准包装 |
| 其它名称： | IR3623MTRPBFDKR |
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IR3623MPbF
Feedback Compensation
The IR3623 is a voltage mode controller; the
control loop is a single voltage feedback path
V OUT
R 6 F b
including error amplifier and error comparator. To
achieve fast transient response and accurate
output regulation, a compensation circuit is
necessary. The goal of the compensation
network is to provide a closed loop transfer
R 5
V REF
E/A
Comp
C 9
R 4
Ve
C POLE
function with the highest 0dB crossing frequency
and adequate phase margin (greater than 45 o ).
The output LC filter introduces a double pole, –
40dB/decade gain slope above its corner
resonant frequency, and a total phase lag of 180 o
Gain(dB)
H(s) dB
(see figure 18). The resonant frequency of the LC
filter expressed as follows:
F Z
Frequency
F LC ?
1
2 ? ? L o ? C o
- - - -(15)
Fig. 19: TypeII compensation network
and its asymptotic gain plot
figure 16 shows gain and phase of the LC filter.
Since we already have 180 o phase shift just from
the output filter, the system risks being unstable.
The transfer function (Ve/Vo) is given by:
H ( s ) ? ? ? g m *
R 5 ? 1 ? sR 4 C 9
R 5 ? R 6 ? ?
?
?
? *
sC 9
- - - -(17)
The (s) indicates that the transfer function varies
as a function of frequency. This configuration
introduces a gain and zero, expressed by:
? H ? s ? ? ? ? ? ? g m *
? * R 4
Fig. 18: Gain and Phase of LC filter
?
R 5 ?
R 5 ? R 6 ? ?
- - - -(18)
The IR3623’s error amplifier is a differential-input
transconductance amplifier. The output is
F z ?
1
2 ? * R 4 * C 9
- - - -(19)
available for DC gain control or AC phase
compensation.
The E/A can be compensated either in type II or
typeIII compensation. When it is used in typeII
compensation the transconductance properties of
the E/A become evident and can be used to
cancel one of the output filter poles. This will be
accomplished with a series RC circuit from Comp
The gain is determined by the voltage divider and
E/A’s transconductance gain.
First select the desired zero-crossover frequency
(Fo):
F o ? F ESR and F o ? ? 1/5 ~ 1/10 ? * F s
Use the following equation to calculate R 4 :
V in * F LC * R 5 * g m
pin to ground as shown in figure 19.
This method requires that the output capacitor
should have enough ESR to satisfy stability
R 4 ?
V osc * F o * F ESR * ( R 5 ? R 6 )
2
- - - -(20)
F ESR ?
2 ? ? * ESR * C o
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 follows:
1
- - - -(16)
Where:
V in = Maximum Input Voltage
V osc = Oscillator Ramp Voltage
F o = Crossover Frequency
F ESR = Zero Frequency of the Output Capacitor
F LC = Resonant Frequency of the Output Filter
g m = Error Amplifier Transconductance
www.irf.com
January 28, 2013
20
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| IR3624MPBF | 功能描述:IC REG CTRLR BUCK PWM VM 10-MLPD 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) |
| IR3624MTRPBF | 功能描述:开关变换器、稳压器与控制器 HI FREQ SYNC PWM 600kHz 5 or 12V 0.6 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 |
| IR3628MPBF | 功能描述:IC CTLR PWM BUCK SYNC 12-MLPD RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,000 系列:- 应用:电源，ICERA E400，E450 输入电压:4.1 V ~ 5.5 V 输出数:10 输出电压:可编程 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:42-WFBGA，WLCSP 供应商设备封装:42-WLP 包装:带卷 (TR) |
| IR3628MTRPBF | 功能描述:电压模式 PWM 控制器 HI FREQ SYNC PWM 600kHz 5 or 12V 0.6 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 |
| IR3629 | 制造商:IRF 制造商全称:International Rectifier 功能描述:HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER WITH POWER GOOD OUTPUT |
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