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参数资料
| 型号： | IR3640MPBF |
| 厂商： | International Rectifier |
| 文件页数： | 16/32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
Bootstrap Capacitor Selection
To drive the high side switch, it is necessary to
supply a gate voltage at least 4V greater than the
bus voltage. This is achieved by using a
bootstrap configuration, which comprises the
internal bootstrap diode and an external
Input Capacitor Selection
The ripple current generated during the on time
of upper the MOSFET should be provided by the
input capacitor. The RMS value of this ripple is
expressed by:
capacitor (C6). The operation of the circuit is as
follows: When the lower MOSFET is turned on,
I RMS = I o ? D ? ( 1 ? D )
-- (12)
the capacitor node connected to SW is pulled
down to ground. The capacitor charges towards
PV cc through the internal bootstrap diode, which
has a forward voltage drop V D . The voltage V C
across the bootstrap capacitor C6 is
D =
Where:
D is the Duty Cycle
V o
V in
- -(13)
approximately given as
V C ? PV CC ? V D -- ( 10)
When the upper MOSFET turns on in the next
cycle, the capacitor node connected to SW rises
to the bus voltage V in . However, if the value of
C6 is appropriately chosen, the voltage V C
across C6 remains approximately unchanged
and the voltage at the Boot pin becomes
V Boot ? V in + PV cc ? V D - -(11)
Fig. 14: Bootstrap circuit to generate
Vc voltage
A capacitor in the range of 0.1uF is generally
adequate for most applications.
06/15/2009
I RMS is the RMS value of the input capacitor
current.
Io is the output current.
For Io=25A and D=0.15, the I RMS =8.9A.
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
advisable to have 4x10uF 25V ceramic
capacitors GRM31CR61E106KA12L from Murata
Electronics. In addition to these, although not
mandatory, a 2X330uF, 25V SMD capacitor
EEV-FK1E331P may also be used as a bulk
capacitor.
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:
16
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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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