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| 型号： | IR3638STRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 11/15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
Power MOSFET Selection (Cont..)
Feedback Compensation
The IRF8910 has the following data:
The IR3638 is a voltage mode controller; the
V ds = 20 V , I d = 10 A
R ds ( on ) = 13 . 4 m Ω @ V gs = 10 V
control loop is a single voltage feedback path
including error amplifier and error comparator. To
achieve fast transient response and accurate
output regulation, a compensation circuit is
The conduction losses will be: P con =0.724W
The switching loss is more difficult to calculate,
even though the switching transition is well
understood. The reason is the effect of the
necessary. The goal of the compensation
network is to provide a closed loop transfer
function with the highest 0dB crossing frequency
and adequate phase margin (greater than 45 o ).
parasitic components and switching times during
the switching procedures such as turn-on / turn-
The output LC filter introduces a double pole, –
off delays and rise and fall times. The control
40dB/decade gain slope above its corner
MOSFET contributes to the majority of the
resonant frequency, and a total phase lag of 180 o
switching losses in synchronous Buck converter.
(see figure 10). The resonant frequency of the LC
The synchronous MOSFET turns on under zero
filter expressed as follows:
voltage conditions, therefore, the turn on losses
for synchronous MOSFET can be neglected.
With a linear approximation, the total switching
F LC =
1
2 ? π L o ? C o
- - - (8)
loss can be expressed as:
V t r + t f
P sw = ds ( off ) * * I load - - - (7)
2 T
Figure 10 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.
Where:
Gain
Phase
V ds(off) = Drain to source voltage at the off time
t r = Rise time
t f = Fall time
0dB
-40dB/decade
0
T = Switching period
Iload = Load current
The switching time waveforms is shown in
figure9.
F LC Frequency
-180
F LC
Frequency
V DS
90%
10%
V GS
Fig. 10: Gain and Phase of LC filter
The IR3638’s error amplifier is a differential-input
transconductance amplifier. The output is
available for DC gain control and AC phase
compensation.
The error amplifier can be compensated either in
type II or typeIII compensation. When it is used in
t d (ON)
t r
t d (OFF)
t f
typeII compensation the transconductance
properties of the error amplifier become evident
Fig. 9: switching time waveforms
and can be used to cancel one of the output filter
poles. This will be accomplished with a series RC
From IRF8910 data sheet:
t r = 10ns, t f = 4.1ns
These values are taken under a certain condition
test. For more details please refer to the IRF8910
data sheet.
circuit from Comp pin to ground as shown in
figure 11.
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
By using equation (7), we can calculate the
switching losses. P sw =0.37W
which is essential for an acceptable phase
margin.
3/19/07
11
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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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