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参数资料
| 型号： | XRP7665EVB |
| 厂商： | Exar Corporation |
| 文件页数： | 9/12页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL STEP-DOWN XRP7665 |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 0.925 V ~ 16 V |
| 电流 - 输出： | 3A |
| 输入电压： | 4.75 V ~ 18 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 340kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | XRP7665 |
| 其它名称： | 1016-1754 |
X R P 7 6 6 5
3 A 1 8 V S y n c h r o n o u s S t e p - D o w n C o n v e r t e r
If tantalum or electrolytic capacitors are used
then Δ V OUT is essentially a function of ESR:
INPUT CAPACITOR C IN
Select the input capacitor for voltage rating,
Circuit configuration is shown in figures 16 and
17. The external bootstrap diode is also
recommended where duty cycle (V OUT /V IN ) is
larger than 65%.
RMS current rating and capacitance. The
voltage rating should be at least 50% higher
than the regulator ’s maximum input voltage.
Calculate the capacitor’s current rating from:
V IN = 5V
IN
BS
1N4148
Where:
I OUT is regulator’s maximum current ( 3A)
XRP7665
SW
10nF
D is duty cycle (D=V OUT /V IN )
Fig. 16: Optional external bootstrap diode
where input voltage is fixed at 5V
Calculate the C IN capacitance from:
1N4148
BS
Where:
ΔV IN is the permissible input voltage ripple,
nominally set at 1% of V IN
XRP7665
SW
10nF
V OUT = 5V
or 3.3V
C OUT
O PTIONAL S CHOTTKY DIODE
30V/1A
Rectifier
An optional Schottky diode may be paralleled
between the GND pin and SW pin to improve
the regulator efficiency. Examples are shown
in Table 3.
Voltage/Current
Part Number Vendor
Rating
B130 30V/1A Diodes, Inc.
SK13 30V/1A Diodes, Inc.
International
MBRS130
Table 3. Optional Schottky diode
EXTERNAL BOOTSTRAP DIODE
A low-cost diode, such as 1N4148, is
recommended for higher efficiency when the
input voltage is 5V or the output is 5V or 3.3V.
Fig. 17: Optional external bootstrap diode
where output voltage is 5V or 3.3V
LOOP COMPENSATION
XRP7665 utilizes current-mode control. This
allows using a minimum of external
components to compensate the regulator. In
general only two components are needed: RC
and CC. Proper compensation of the regulator
(determining RC and CC) results in optimum
transient response. In terms of power supply
control theory, the goals of compensation are
to choose RC and CC such that the regulator
loop gain has a crossover frequency fc
between 15kHz and 34kHz. The corresponding
phase-margin should be between 45 degrees
and 65 degrees. An important characteristic of
current-mode buck regulator is its dominant
pole. The frequency of the dominant pole is
given by:
? 2013 Exar Corporation
9/12
Rev. 2.0.1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| XRP7665IDBTR-F | 功能描述:电流型 PWM 控制器 3A 18V Synchronous Step Down Regulator RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| XRP7674 | 制造商:EXAR 制造商全称:EXAR 功能描述:2A 18V Synchronous PFM/PWM Step-Down Regulator |
| XRP7674EVB | 功能描述:电源管理IC开发工具 2A 18V PFM/PWM EVAL Board RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| XRP7674IDTR-F | 功能描述:直流/直流开关调节器 2A 18V PFM/PWM Step-Down Regulator 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 |
| XRP7675 | 制造商:EXAR 制造商全称:EXAR 功能描述:3A 18V Synchronous PFM/PWM Step-Down Regulator |
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