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参数资料
| 型号： | IR3640MPBF |
| 厂商： | International Rectifier |
| 文件页数： | 19/32页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 20-MLPQ |
| 标准包装： | 100 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1.65MHz |
| 占空比： | 92% |
| 电源电压： | 4.5 V ~ 5.5 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： | 20-VFQFN 裸露焊盘 |
| 包装： | 管件 |
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IR3640MPBF
The output LC filter introduces a double pole,
Z IN
V OUT
C POLE
–40dB/decade gain slope above its corner
resonant frequency, and a total phase lag of 180 o
(see Fig. 16). The resonant frequency of the LC
R 8
R 3
C 4
Z f
filter is expressed as follows:
F LC =
1
2 ? π L o ? C o
- -(16)
R 9
Fb
E/A
Comp
Ve
Figure 16 shows gain and phase of the LC filter.
Since we already have 180 o phase shift from the
output filter alone , the system risks being
unstable.
H(s) dB
Gain(dB)
V REF
F
Gain
Phase
F Z
POLE
Frequency
0dB
0
-40dB/decade
Fig. 17: TypeII compensation network
and its asymptotic gain plot
The transfer function (Ve/Vo) is given by:
1 + sR 3 C 4
-180 o
F LC Frequency
F LC Frequency
V e
V o
= H ( s ) = ?
Z f
Z IN
= ?
sR 8 C 4
- -(18)
H ( s ) = 3
- -(19)
F z =
- -(20)
Fig. 16: Gain and Phase of LC filter
The IR3640 uses a voltage-type error amplifier
with high-gain (110dB) and wide-bandwidth. The
output of it is available for DC gain control or AC
phase compensation.
The error amplifier can be compensated either in
type II or type III compensation. When it is used
in type II compensation, a series RC circuit from
Comp pin to ground as shown in figure 16 is
used.
This method requires the output capacitor should
have enough ESR to satisfy stability
The (s) indicates that the transfer function varies
as a function of frequency. This configuration
introduces a gain and zero, expressed by:
R
R 8
1
2 π *R 3 *C 4
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 R3:
requirements. In general the output capacitor’s
ESR generates a zero typically at 5kHz to 50kHz
which is essential for an acceptable phase
R 3 =
V osc * F o * F ESR * R 8
V in * F LC 2
- -(21)
F ESR =
- -(17)
margin.
The ESR zero of the output capacitor expressed
as follows:
1
2 ? π * ESR * C o
06/15/2009
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
R 8 = Feedback Resistor
19
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相关代理商/技术参数 |
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| 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 |
| IR3651STRPBF-CUT TAPE | 制造商:IR 功能描述:IR3651SPbF Series 13.2 V 7 mA High Voltage Synchronous PWM Buck Controller |
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