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| 型号： | IR3832WMTR1PBF |
| 厂商： | International Rectifier |
| 文件页数： | 18/32页 |
| 文件大小： | 0K |
| 描述： | IC REG SYNC BUCK 4A DDR 15-QFN |
| 特色产品： | Gen2.1 SupIRBuck? Integrated Voltage Regulators |
| 标准包装： | 1 |
| 系列： | SupIRBuck™ |
| 应用： | 转换器，DDR |
| 输入电压： | 1.5 V ~ 16 V |
| 输出数： | 1 |
| 输出电压： | 0.6 V ~ 14.4 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 15-PowerVQFN |
| 供应商设备封装： | PQFN（5x6） |
| 包装： | 标准包装 |
| 其它名称： | IR3832WMTR1PBFDKR |
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PD-97508
IR3832WMPbF
V o
Bootstrap Capacitor Selection
To drive the Control FET, it is necessary to
supply a gate voltage at least 4V greater than the
voltage at the SW pin, which is connected the
source of the Control FET . This is achieved by
using a bootstrap configuration, which comprises
the internal bootstrap diode and an external
bootstrap capacitor (C6), as shown in Fig. 11..
The operation of the circuit is as follows: When
the lower MOSFET is turned on, the capacitor
node connected to SW is pulled down to ground.
The capacitor charges towards V cc through the
internal bootstrap diode, which has a forward
voltage drop V D . The voltage V c across the
bootstrap capacitor C6 is approximately given as
V c ? V 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 + V cc ? V D .......... .......... .......... .......... (11)
D = .......... .......... .......... .. (13)
V in
Where:
D is the Duty Cycle
I RMS is the RMS value of the input capacitor
current.
I o is the output current.
For I o =4 A and D = 0.0625, the I RMS = 0.97 A
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 2x10uF 16V ceramic capacitors
ECJ-3YB1C106M from Panasonic. In addition to
these, although not mandatory, a 330uF 25V
SMD capacitor EEV-FK1E332P from Panasonic
may 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 results in a smaller size and
faster response to a load transient but poor
efficiency and high output noise due to large
ripple current. 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 ?
Fig. 11. Bootstrap circuit to generate
Δ i
Δ t
L = ( V in ? V o ) ?
1
F s
V o
V in ? Δ i * F s
.......... .......... ... (14)
Vc voltage
A bootstrap capacitor of value 0.1uF is suitable
for most applications.
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:
I RMS = I o ? D ? ( 1 ? D ) .......... .......... ....(12)
Rev 6.0
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
If Δ i ≈ 30%( I o ), then the output inductor is
calculated to be 1.46 μ H. Select L =1.50 μ H.
The MPO104-1R5 from Delta provides a
compact, low profile inductor suitable for this
application.
18
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IR3832WMTRPBF | 功能描述:直流/直流开关调节器 4A 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 |
| IR3837MPBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:HIGHLY INTEGRATED 14A SINGLE-INPUT VOLTAGE, SYNCHRONOUS BUCK REGULATOR |
| IR3837MTR1PBF | 功能描述:直流/直流开关调节器 14A 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 |
| IR3837MTR1PBF | 制造商:International Rectifier 功能描述:IC DC-DC CONV 1.5 MHz QFN-17 制造商:International Rectifier 功能描述:IC, DC-DC CONV, 1.5 MHz, QFN-17 |
| IR3837MTR1PBF-CUT TAPE | 制造商:IR 功能描述:IR3837 Series 1.5 MHz 14 A Surface Mount Synchronous Buck Regulator - QFN-16 |
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