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| 型号： | IRU3038CF |
| 厂商： | International Rectifier |
| 文件页数： | 10/18页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM TSSOP14 |
| 标准包装： | 94 |
| 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 ~ 12 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： | 14-TSSOP（0.173"，4.40mm 宽） |
| 包装： | 管件 |
| 产品目录页面： | 1384 (CN2011-ZH PDF) |
| 其它名称： | *IRU3038CF |
IRU3038
R 8 =
g m
6) Place second pole at the ESR zero.
F P2 = F ESR
1
2 p 3 C 10 3 F P2
1
Check if R 8 >
If R 8 is too small, increase R 7 and start from step 2.
7) Place second zero around the resonant frequency.
Layout Consideration
The layout is very important when designing high fre-
quency switching converters. Layout will affect noise
pickup and can cause a good design to perform with
less than expected results.
Start to place the power components. Make all the con-
nections in the top layer with wide, copper filled areas.
The inductor, output capacitor and the MOSFET should
be close to each other as possible. This helps to reduce
R 6 =
F Z2 = F LC
1
2 p 3 C 10 3 F Z2
- R 8
the EMI radiated by the power traces due to the high
switching currents through them. Place input capacitor
directly to the drain of the high-side MOSFET. To reduce
the ESR, replace the single input capacitor with two par-
8) Use equation (1) to calculate R 5 :
allel units. The feedback part of the system should be
R 5 =
V REF
V OUT - V REF
3 R 6
kept away from the inductor and other noise sources
and be placed close to the IC. In multilayer PCB, use
one layer as power ground plane and have a separate
These design rules will give a crossover frequency ap-
proximately one-tenth of the switching frequency. The
higher the band width, the potentially faster the load tran-
sient speed. The gain margin will be large enough to
provide high DC-regulation accuracy (typically -5dB to -
12dB). The phase margin should be greater than 45 8 for
overall stability.
IC Quiescent Power Dissipation
Power dissipation for IC controller is a function of ap-
plied voltage, gate driver loads and switching frequency.
The IC's maximum power dissipation occurs when the
IC operating with single 12V supply voltage (Vcc=12V
and Vc ? 24V) at 400KHz switching frequency and maxi-
mum gate loads.
This IC's power dissipation results to an excessive tem-
perature rise and should be considered when using
IRU3038 for such an application.
control circuit ground (analog ground), to which all sig-
nals are referenced. The goal is to localize the high cur-
rent path to a separate loop that does not interfere with
the more sensitive analog control function. These two
grounds must be connected together on the PC board
layout at a single point.
10
www.irf.com
Rev. 2.0
09/12/02
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IRU3038CFTRPBF | 制造商:International Rectifier 功能描述:Voltage Mode PWM Controller 500mA 14-Pin TSSOP T/R |
| IRU3038CS | 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: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) |
| IRU3038CSTR | 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:- 特色产品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 标准包装:1 系列:PowerWise® PWM 型:电压模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.5 V ~ 18 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:-5°C ~ 125°C 封装/外壳:32-WFQFN 裸露焊盘 包装:Digi-Reel® 产品目录页面:1303 (CN2011-ZH PDF) 其它名称:LM3754SQDKR |
| IRU3039 | 制造商:IRF 制造商全称:International Rectifier 功能描述:SYNCHRONOUS PWM CONTROLLER WITH OVER CURRENT PROTECTION |
| IRU3039CH | 制造商:IRF 制造商全称:International Rectifier 功能描述:SYNCHRONOUS PWM CONTROLLER WITH OVER CURRENT PROTECTION |
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