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参数资料
| 型号： | IR3832WMTR1PBF |
| 厂商： | International Rectifier |
| 文件页数： | 17/32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
? .......... .......... .......... .... (8)
R 9 = R 8 ? ?
Application Information
Design Example:
The following example is a typical application for
IR3832W. The application circuit is shown on
page 23.
V in = 12 V ( 13.2V max)
V o = 0.75 V
I o = 4 A
Δ V o ≤ 22.5mV
F s = 400 kHz
Enabling the IR3832W
As explained earlier, the precise threshold of
the Enable lends itself well to implementation of
a UVLO for the Bus Voltage.
V in
When an external resistor divider is connected to
the output as shown in figure 10.
Equation (5) can be rewritten as:
? V p ?
? ?
? V o ? V p ?
For low voltage applications, such as this
design, it is often advisable to eliminate the bias
resistor R9 from Fb to ground. For the calculated
value of R8 see feedback compensation section.
IR3832W
Enable
R 1
R 2
Fig. 10. Typical application of the IR3832W for
programming the output voltage
Further, the tracking reference Vp may be itself
derived from some master reference by means
of a resistive divider as shown in Fig. 9. This is
For a typical Enable threshold of V EN = 1.2 V
common in active bus termination circuits such
as Voltage Tracking Termination (VTT) where
V in (min) *
R 2
R 1 + R 2
= V EN = 1.2 .......... (5)
the tracking reference Vp may be obtained as
half of the master reference VDDQ which forms
the input to one or more memory banks.
R 2 = R 1
V EN
V o = V p ? ? ? 1 + 8 ? ? .......... .......... .......... .....(7)
.......... (6)
V in( min ) ? V EN
For a V in (min) =10.2V, R 1 =49.9K and R 2 =7.50K is
a good choice.
Programming the frequency
For F s = 400 kHz, select R t = 35.7 k ? , using
Table. 1.
Output Voltage Programming
Output voltage is programmed by the tracking
reference voltage at Vp and external voltage
divider. The divider is ratioed such that the
voltage at the Fb pin is equal to the voltage at the
Vp pin pin when the output is at its desired value.
The output voltage is defined by using the
following equation:
? R ?
? R 9 ?
Rev 6.0
In this design,
VDDQ =1.5V
R p1 = R p2 =1.5 k ?
Vp =0.75V
Soft-Start Programming
The soft-start timing can be programmed by
selecting the soft-start capacitance value. From
(1), for a desired start-up time of the converter,
the soft start capacitor can be calculated by
using:
C SS ( μ F ) = T start ( ms ) × 0.02857 .......... (9)
Where T start is the desired start-up time (ms).
For tracking applications the output is generally
required to track Vp even at start-up. Hence, it is
necessary to ensure that the SS pin is already
up to 3 V before the tracking reference signal is
applied to the Vp pin. This can be done by
choosing a small value for the soft-start
capacitor to ensure that the voltage at the SS pin
rises to 3 V quickly. A 0.022 uF capacitor is
chosen for this purpose.
17
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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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