- 您现在的位置：买卖IC网 > PDF目录1812 > IRU3137CSTRPBF (International Rectifier)IC REG CTRLR BUCK PWM VM 8-SOIC PDF资料下载
参数资料
| 型号： | IRU3137CSTRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 9/19页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 8-SOIC |
| 标准包装： | 2,500 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 240kHz |
| 占空比： | 90% |
| 电源电压： | 4.25 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： | 带卷 (TR) |
IRU3137
Choose IRF7832 for both control MOSFET and synchro-
nous MOSFET. This device provides low on-resistance
in a compact SOIC 8-Pin package.
The MOSFET has the following data:
IRF7832
V DSS = 30V
I D = 20A @ 25 C
R DS(ON) = 4m ? @ V GS =10V
The total conduction losses will be:
P CON(TOTAL) = P CON(UPPER) + P CON(LOWER)
P CON(TOTAL) = 1.166W
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
as turn-on / turnoff delays and rise and fall times. The
control MOSFET contributes to the majority of the switch-
ing losses in synchronous Buck converter. The synchro-
nous MOSFET turns on under zero voltage conditions,
therefore, the turn on losses for synchronous MOSFET
can be neglected. With a linear approximation, the total
switching loss can be expressed as:
These values are taken under a certain condition test.
For more details please refer to the IRF7466 and IRF7458
data sheets.
By using equation (12), we can calculate the total switch-
ing losses.
P SW(TOTAL) = 250mW
Feedback Compensation
The IRU3137 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 8). The Reso-
nant frequency of the LC filter is expressed as follows:
1
F LC = ---(13)
2 π× L O × C O
V DS(OFF)
P SW =
2
Where:
×
t r + t f × I LOAD
T
---(12)
Figure 9 shows gain and phase of the LC filter. Since we
already have 180 phase shift just from the output filter,
the system risks being unstable.
V DS(OFF) = Drain to Source Voltage at off time
Gain
Phase
t r = Rise Time
t f = Fall Time
0dB
-40dB/decade
0
T = Switching Period
I LOAD = Load Current
The switching time waveform is shown in Figure 7.
V DS
F LC Frequency
-180
F LC
Frequency
90%
10%
V GS
Figure 8 - Gain and phase of LC filter.
t d (ON)
t r
t d (OFF)
t f
Figure 7 - Switching time waveforms.
From IRF7832 data sheet we obtain:
IRF7832
t r = 12.3ns
t f = 21ns
www.irf.com
9
相关PDF资料 |
PDF描述 |
|---|---|
| IRU3138CSTRPBF | IC REG CTRLR BUCK PWM VM 14-SOIC |
| IRU3146CFTR | IC REG CTRLR BUCK PWM VM 28TSSOP |
| IRU431LCL5TR | IC VREF SHUNT PREC ADJ SOT-23-5 |
| ISL1801IVZ | IC CONV SOLAR PWR 48TSSOP |
| ISL21009BFB825Z-T7A | IC VREF SERIES PREC 2.5V 8-SOICN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| IRU3138 | 制造商:IRF 制造商全称:International Rectifier 功能描述:SYNCHRONOUS PWM CONTROLLER FOR TERMINATION POWER SUPPLY APPLICATIONS |
| IRU3138CS | 制造商:IRF 制造商全称:International Rectifier 功能描述:SYNCHRONOUS PWM CONTROLLER FOR TERMINATION POWER SUPPLY APPLICATIONS |
| IRU3138CSTR | 功能描述:IC REG CTRLR BUCK PWM VM 14-SOIC 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: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) |
| IRU3138CSTRPBF | 功能描述:电压模式 PWM 控制器 SYNC PWM CTRLLER 1A .8V 200 to 400kHz 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 |
| IRU3146 | 制造商:IRF 制造商全称:International Rectifier 功能描述:DUAL SYNCHRONOUS PWM CONTROLLER WITH CURRENT SHARING CIRCUITRY AND AUTO-RESTART |
发布紧急采购，3分钟左右您将得到回复。