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参数资料
| 型号： | XRP7665EVB |
| 厂商： | Exar Corporation |
| 文件页数： | 7/12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
THEORY OF OPERATION
F UNCTIONAL D ESCRIPTION
The XRP7665 is a synchronous, current-mode,
step-down regulator. It regulates input
voltages from 4.5V to 18V and supplies up to
3A of continuous load current. The XRP7665
uses current-mode control to regulate the
output voltage. The output voltage is
measured at FB through a resistive voltage
divider and input to a transconductance error
amplifier. The high-side switch current is
compared to the output of the error amplifier
to control the output voltage. The regulator
utilizes internal N-channel MOSFETs to step-
down the input voltage. A bootstrapping
capacitor connected between BS and SW acts
as a supply for high-side MOSFET. This
capacitor is charged from the internal 5V
supply when SW node is low. The XRP7665
has several powerful protection features
including OCP, OVP, OTP, UVLO and output
short-circuit.
PROGRAMMABLE SOFT - START
The soft-start time is fully programmable via
CSS capacitor, placed between the SS and
GND pin. The CSS is charged by a 6μA
constant-current source, generating a ramp
signal fed into non-inverting input of the error
amplifier. This ramp regulates the voltage on
comp pin during the regulator startup, thus
realizing soft-start. Calculate the required CSS
from:
Where:
tss is the required soft-start time
V FB is the feedback voltage (0.925V nominal)
ENABLE FUNCTION
The XRP7665 is enabled by raising the voltage
on the EN pin above 2.5V nominally. Connect
the EN pin to the VIN via a 100kΩ resistor for
automatic start-up. Shutdown is achieved by
pulling the EN pin voltage below 1.1V
nominally.
OVERCURRENT PROTECTION OCP
The OCP protects against accidental increase
in load current that can cause the regulator to
fail. The current of internal switch M1 is
monitored. If this current reaches 5.6A then
M1 is turned off until next switching cycle.
SHORT - CIRCUIT PROTECTION
If there is short-circuit across the output, the
feedback voltage V FB will droop. If V FB drops
below 0.3V the XRP7665 will detect a short-
circuit condition and reduce the switching
frequency to 90kHz for system protection. The
regulator will restart once the short-circuit has
been removed.
OVERVOLTAGE PROTECTION OVP
The XRP7665 has internal OVP. When V OUT
exceeds the OVP threshold (when V FB exceeds
1.1V) the power switching will be turned off.
The XRP7665 will restart when overvoltage
condition is removed.
OVER - TEMPERATURE PROTECTION OTP
If the junction temperature exceeds 160°C the
OTP circuit is triggered, turning off the internal
control circuit and switched M1 and M2. When
junction temperature drops below 140°C the
XRP7665 will restart.
APPLICATION INFORMATION
SETTING THE OUTPUT VOLTAGE
Use an external resistor divider to set the
output voltage. Program the output voltage
from:
Where:
R1 is the resistor between V OUT and FB
R2 is the resistor between FB and GND
(nominally 10k?)
0.925V is the nominal feedback voltage.
? 2013 Exar Corporation
7/12
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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