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参数资料
| 型号： | IP1001TR |
| 厂商： | International Rectifier |
| 文件页数： | 11/18页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 20A 256BGA |
| 标准包装： | 750 |
| 系列： | iPOWIR™ |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.93 V ~ 2 V |
| 输入电压： | 3.3 V ~ 12 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 200kHz，300kHz |
| 电流 - 输出： | 20A |
| 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： | 256-BGA（218 凸块） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | BGA（14x14） |
| 配用： | IRDCIP1001-A-ND - CONV SGL PHA SYNC BUCK 3.3-4.5V |
iP1001
DESIGN PROCEDURE
Inductor Selection
The inductor is selected according to the following
expression.
L = V OUT x (1-D) / (fsw x ? I L )
A 470 μ F POSCAP capacitor has a maximum 35m ?
of ESR which provides 9.7kHz zero frequency.
The ESR zero frequency must be set below 12kHz.
This value is calculated assuming the capacitor
datasheet maximum ESR value.
where, D = V
OUT
/V
IN
Example:
V OUT is the output voltage in Volts,
fsw is the switching frequency in kHz,
? I L is the output inductor ripple current.
The inductor value should be selected from 0.8 μ H
to 2.0 μ H range.
Output Capacitor Selection
Use tantalum or POSCAP type capacitors for iP1001.
Selection of the output capacitors depends on
several factors.
? Low effective ESR for ripple and load transient
requirements.
? Stability.
To support the load transients and to stay within a
specified voltage dip ? V due to the transients, ESR
selection should satisfy the following equation:
R ESR ≤ ? V/ ? I
where, ? I is the transient load step
If output voltage ripple is required to be maintained
at specified levels then, the following expression
should be used to select the output capacitors.
R ESR ≤ V p-p / ? I L
where, V p-p is the peak to peak output voltage ripple.
The value of the output capacitor ESR zero frequency
also determines stability. The value of the ESR zero
frequency is calculated by the expression:
R ESR = 1 / (2 π x f ESR x C OUT )
www.irf.com
To determine the amount of capacitance
to meet a 30mVp-p output ripple, with 4A
inductor current ripple requirement.
The calculated ESR will be = 30mV/4A =
7.5m ? . This will require 5 x 470uF POSCAP
capacitors. The total ESR will result in a
9.7kHz zero frequency.
For stable operation:
? Set the resonant frequency f o of the output
inductor and capacitor between 2kHz and 4kHz.
The resonant frequency is calculated using the
following expression:
f o = 1/ (2 π x ( √ LC))
? Select the output inductor value between 0.8 μ H
to 2.0 μ H and the output capacitance between
1880 μ F (4x 470 μ F) and 5600 μ F (12x470 μ F)
? Set the minimum output ripple voltage to be
greater than 0.5% of the output voltage. Select the
capacitor by ESR and by voltage rating rather than
capacitance.
External Input Capacitor Selection
The switching currents impose RMS current
requirements on the input capacitors. The following
expression allows the selection of the input
capacitors, based on the input RMS current:
I RMS = I LOAD x ( √ D x (1-D))
where, D = V OUT /V IN
11
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