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参数资料
| 型号： | XRP7714ILB-0X1C-F |
| 厂商： | Exar Corporation |
| 文件页数： | 26/29页 |
| 文件大小： | 1009K |
| 描述： | IC REG 5OUT BCK/LINEAR 40TQFN |
| 标准包装： | 490 |
| 系列： | PowerXR |
| 拓扑： | 降压（降压）同步（4），线性（LDO）（1） |
| 功能： | 任何功能 |
| 输出数： | 5 |
| 频率 - 开关： | 1.5MHz |
| 电压/电流 - 输出 1： | 控制器 |
| 电压/电流 - 输出 2： | 控制器 |
| 电压/电流 - 输出 3： | 控制器 |
| 带 LED 驱动器： | 无 |
| 带监控器： | 无 |
| 带序列发生器： | 是 |
| 电源电压： | 4.75 V ~ 25 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-WFQFN 裸露焊盘 |
| 供应商设备封装： | 40-TQFN（6x6） |
| 包装： | 托盘 |
| 其它名称： | 1016-1698 |
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?2011 Exar Corporation
26/29
Rev. 1.1.6
Select ESR such that output voltage ripple (Vrip) specification is met. There are two components in
Vrip. First component arises from the charge transferred to and from Cout during each cycle. The
second component of Vrip is due to the inductor ripple current flowing through the output
capacitors ESR. It can be calculated for Vrip:
55_5V5] = 5<5_5V5] ?/DIV>
?/DIV>
55F5E
2
+ ?/DIV>
1
8 ?565\5b5a ?5S5`
?/DIV>
2
Where:
Irip is the inductor ripple current
fs is the switching frequency
Cout is the output capacitance
Note that a smaller inductor results in a higher Irip, therefore requiring a larger Cout and/or lower
ESR in order to meet Vrip. With the current generation of ultra-low ESR ceramic capacitors it is
common to operate with Irip e 30% of Iout.
When trying to optimize control loop bandwidth, particularly at switching frequencies below
600kHz, an effective ESR in the range of 7 to 20mohm can help significantly. The Digital Power
Studio design tool is used to verify what will work best in your application.
" Input Capacitor Selection
Select the input capacitor for Voltage, Capacitance, ripple current, ESR and ESL. Voltage rating is
nominally selected to be at least twice the input voltage. The RMS value of input capacitor current,
assuming a low inductor ripple current, can be approximated as:
55V5[ = 5<5\5b5a ??7 ?/DIV>
(
1 57
)
Where:
Iin is the RMS input current
Iout is the DC output current
D is the duty cycle
In general, the total input voltage ripple should be kept below 1.5% of VIN. The input voltage
ripple also has two major components: the voltage drop on the main capacitor
Cin
V and the
voltage drop due to ESR -
ESR
V
. The contribution to Input voltage ripple by each term can be
calculated from:
2
)
(
out
in
out
out
Cin
V
C
f
V
V
V
I
V
=
)
5
.
0
(
rip
out
ESR
I
I
ESR
V
+
?/DIV>
=
Total input voltage ripple is the sum of the above:
ESR
Cin
Tot
V
V
V
+
=
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