- 您现在的位置：买卖IC网 > PDF目录14763 > IR3843AMTR1PBF (International Rectifier)IC REG BUCK SYNC ADJ 3A 15QFN PDF资料下载
参数资料
| 型号： | IR3843AMTR1PBF |
| 厂商： | International Rectifier |
| 文件页数： | 19/33页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 3A 15QFN |
| 产品培训模块： | SupIRBuck? Family and POL Design Tools Overview |
| 标准包装： | 1 |
| 系列： | SupIRBuck™ |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.7 V ~ 18.9 V |
| 输入电压： | 1.5 V ~ 21 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 225kHz ~ 1.32MHz |
| 电流 - 输出： | 3A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 15-PowerVQFN |
| 包装： | 标准包装 |
| 供应商设备封装： | PQFN（5x6） |
| 其它名称： | IR3843AMTR1PBFDKR |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页当前第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页
PD-97509
IR3843AMPbF
the voltage Vc across C6 remains approximately
unchanged and the voltage at the Boot pin
becomes
V Boot ? V in + V cc ? V D .......... .......... .......... .......... (11)
Fig. 12. Bootstrap circuit to generate
Vc voltage
A bootstrap capacitor of value 0.1uF is suitable
for most applications.
advisable to have 1x10uF 25V ceramic capacitors
C3216X5R1E106M from TDK. In addition to
these, although not mandatory, a 1X330uF, 25V
SMD capacitor EEV-FK1E331P may also be used
as a bulk capacitor and is recommended if the
input power supply is not located close to the
converter.
Inductor Selection
The inductor is selected based on output power,
operating frequency and efficiency requirements.
A low inductor value causes large ripple current,
resulting in the smaller size, faster response to a
load transient but poor efficiency and high output
noise. Generally, the selection of the inductor
value can be reduced to the desired maximum
ripple current in the inductor ( Δ i ) . The optimum
point is usually found between 20% and 50%
ripple of the output current.
For the buck converter, the inductor value for the
desired operating ripple current can be
determined using the following relation:
V in ? V o = L ?
; Δ t = D ?
For applications with 21V input voltage, the switch
node may ring above the 25V absolute maximum
voltage rating. To prevent this, in addition to
using best layout practices, it may be necessary
to provide a 10 ohm resistor in series with the
Δ i
Δ t
L = ( V in ? V o ) ?
1
F s
V o
V in ? Δ i * F s
.......... .......... .......... . (14)
boot capacitor.
Input Capacitor Selection
The ripple current generated during the on time of
the upper MOSFET should be provided by the
input capacitor. The RMS value of this ripple is
expressed by:
Where:
V in = Maximum input voltage
V o = Output Voltage
Δ i = Inductor ripple current
F s = Switching frequency
Δ t = Turn on time
D = Duty cycle
I RMS = I o ? D ? ( 1 ? D ) .......... .......... ....(12)
If Δ i ≈ 40%( I o ), then the output inductor is
calculated to be 2.13 μ H. Select L =2.2 μ H.
D =
V o
V in
.......... .......... .......... .. (13)
The PCMB065T-2R2MS from Vishay provides a
compact, low profile inductor suitable for this
application
Where:
D is the Duty Cycle
I RMS is the RMS value of the input capacitor
current.
Io is the output current.
For I o =3A and D = 0.15, the I RMS = 1.07A.
Ceramic capacitors are recommended due to
their peak current capabilities. They also feature
low ESR and ESL at higher frequency which
enables better efficiency. For this application, it is
Rev 16.0
19
相关PDF资料 |
PDF描述 |
|---|---|
| VE-2ND-EY-F2 | CONVERTER MOD DC/DC 85V 50W |
| 5300-17 | CHOKE RF COATED 22UH 10% |
| MAX6380UR41+T | IC VOLT DETECT LP 4.10V SOT23-3 |
| 9310-22 | CHOKE RF MOLDED 2.7UH 10% |
| GSA18DTKN-S288 | CONN EDGECARD 36POS .125 EXTEND |
相关代理商/技术参数 |
参数描述 |
|---|---|
| IR3843AMTRPBF | 功能描述:直流/直流开关调节器 3A SupIRBuck Reg 250-1200kHz, 1.5-21V RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| IR3843WMPBF | 制造商:International Rectifier 功能描述:2A SUPIRBUCK VOLTAGE REGULATOR WITH PGOOD - Bulk |
| IR3843WMPBF_12 | 制造商:IRF 制造商全称:International Rectifier 功能描述:HIGHLY EFFICIENT INTEGRATED 2A SYNCHRONOUS BUCK REGULATOR |
| IR3843WMTR1PBF | 功能描述:直流/直流开关调节器 2A SupIRBuck Reg 250-1500kHz, 1.5-16V RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| IR3843WMTRPBF | 功能描述:直流/直流开关调节器 2A SupIRBuck Reg 250-1500kHz, 1.5-16V RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
发布紧急采购，3分钟左右您将得到回复。