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| 型号： | IRU3037CS |
| 厂商： | International Rectifier |
| 文件页数： | 7/21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 this design, IRF7301 is a good choice. The device
provides low on-resistance in a compact SOIC 8-Pin
These values are taken under a certain condition test.
For more detail please refer to the IRF7301 data sheet.
package.
By using equation (6), we can calculate the switching
P CON(TOTAL) = I LOAD × R DS(ON) × ?
The IRF7301 has the following data:
V DSS = 20V
I D = 5.2A
R DS(ON) = 0.05 ?
The total conduction losses will be:
P CON(TOTAL) =P CON (Upper Switch)+P CON (Lower Switch)
2
? = 1.5 according to the IRF7301 data sheet for
150 ) C junction temperature
P CON(TOTAL) = 1.2W
The switching loss is more difficult to calculate, even
though the switching transition is well understood. The
reason is the effect of the parasitic components and
switching times during the switching procedures such
losses.
P SW = 0.186W
Feedback Compensation
The IRU3037 is a voltage mode controller; the control
loop is a single voltage feedback path including error
amplifier and error comparator. To achieve fast transient
response and accurate output regulation, a compensa-
tion circuit is 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 ) ).
The output LC filter introduces a double pole, –40dB/
decade gain slope above its corner resonant frequency,
and a total phase lag of 180 ) (see Figure 5). The Reso-
nant frequency of the LC filter expressed as follows:
as turn-on / turnoff delays and rise and fall times. With a
linear approximation, the total switching loss can be ex-
pressed as:
F LC =
2 π×
1
L O × C O
---(7)
V DS(OFF)
P SW =
2
Where:
×
t r + t f × I LOAD
T
---(6)
Figure 5 shows gain and phase of the LC filter. Since we
already have 180 ) phase shift just from the output filter,
V DS(OFF) = Drain to Source Voltage at off time
t r = Rise Time
the system risks being unstable.
t f = Fall Time
T = Switching Period
I LOAD = Load Current
The switching time waveform is shown in figure 4.
V DS
Gain
0dB
-40dB/decade
Phase
0 )
90%
F LC Frequency
-180 )
F LC
Frequency
Figure 5 - Gain and phase of LC filter.
The IRU3037’s error amplifier is a differential-input
10%
V GS
transconductance amplifier. The output is available for
DC gain control or AC phase compensation.
t d (ON)
t r
t d (OFF)
t f
The E/A can be compensated with or without the use of
Figure 4 - Switching time waveforms.
From IRF7301 data sheet we obtain:
t r = 42ns
t f = 51ns
local feedback. When operated without local feedback
the transconductance properties of the E/A become evi-
dent and can be used to cancel one of the output filter
poles. This will be accomplished with a series RC circuit
from Comp pin to ground as shown in Figure 6.
www.irf.com
7
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相关代理商/技术参数 |
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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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