- 您现在的位置：买卖IC网 > PDF目录15506 > XRP6124ES0.5-F (Exar Corporation)IC REG CTRLR BUCK PWM SOT23-5 PDF资料下载
参数资料
| 型号： | XRP6124ES0.5-F |
| 厂商： | Exar Corporation |
| 文件页数： | 8/12页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM SOT23-5 |
| 标准包装： | 250 |
| PWM 型： | 控制器 |
| 输出数： | 1 |
| 频率 - 最大： | 833kHz |
| 占空比： | 92% |
| 电源电压： | 3 V ~ 18 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | SC-74A，SOT-753 |
| 包装： | 散装 |
| 其它名称： | 1016-1429 |
X R P 6 1 2 4
N o n - S y n c h r o n o u s P F E T S t e p - D o w n C o n t r o l l e r
R 1 = R 2 × ? OUT ? 1 ?
finished. If the feedback voltage drops below
0.55V, equivalent to output voltage dropping
below 69% of nominal, the comparator will
trip causing the IC to latch off. In order to
restart the XRP6124, the input voltage has to
be reduced below UVLO threshold and then
increased to its normal operating point.
SOFT - START
To limit in-rush current the XRP6124 has an
internal soft-start. The nominal soft-start time
is 2ms and commences when V IN exceeds the
UVLO threshold. As explained above, the
short-circuit comparator is enabled as soon as
soft-start is complete. Therefore if the input
voltage has a very slow rising edge such that
at the end of soft-start the output voltage has
not reached 69% of its final value then the
XRP6124 will latch-off.
ENABLE
By applying a logic-level signal to the enable
pin EN the XRP6124 can be turned on and off.
Pulling the enable below 1V shuts down the
controller and reduces the V IN leakage current
to 1.5μA nominal as seen in figure 18. Enable
signal should always be applied after the input
voltage or concurrent with it. Otherwise
APPLICATION INFORMATION
SETTING THE OUTPUT VOLTAGE
Use an external resistor divider to set the
output voltage. Program the output voltage
from:
? V ?
? 0 . 8 ?
XRP6124 will latch up. In applications where
an independent enable signal is not available,
a Zener diode can be used to derive V EN from
V IN .
DISCONTINUOUS CONDUCTION MODE , DCM
Because XRP6124 is a non-synchronous
controller, when load current I OUT is reduced to
less than half of peak-to-peak inductor current
ripple Δ IL, the converter enters DCM mode of
operation. The switching frequency fs is now
I OUT dependent and no longer governed by the
relationship shown in table 2. As I OUT is
decreased so does fs until a minimum
switching frequency, typically in the range of
few hundred Hertz, is reached at no load. This
contributes to good converter efficiency at
light load as seen in figures 4 and 5. The
reduced fs corresponding to light load,
however, increases the output voltage ripple
and causes a slight increase in output voltage
as seen in figures 8 and 9. Another effect of
reduced fs at light load is slow down of
transient response when a load step
transitions from a high load to a light load.
This is shown in figures 16 and 17.
FEED - FORWARD CAPACITOR CFF
CFF, which is placed in parallel with R1,
provides a low-impedance/high-frequency
path for the output voltage ripple to be
transmitted to FB. It also helps get an
optimum transient response. An initial value
for CFF can be calculated from:
where:
R1 is the resistor between V OUT and FB
CFF =
1
2 × π × fs × 0 . 1 × R 1
R2 is the resistor between FB and GND
(nominally 2k ? )
0.8V is the nominal feedback voltage.
where:
fs is the switching frequency from table 2
This value can be adjusted as necessary to
provide an optimum load step transient
response.
? 2011 Exar Corporation
8/12
Rev. 1.1.0
相关PDF资料 |
PDF描述 |
|---|---|
| SPD62-122M | INDUCTOR PWR SHIELDED 1.20UH SMD |
| 4590R-686K | INDUCTOR HIGH CURRENT 68000UH |
| 4590R-107K | INDUCTOR HIGH CURRENT 100000UH |
| 4590-107K | INDUCTOR HIGH CURRENT 100000UH |
| 4590R-826K | INDUCTOR HIGH CURRENT 82000UH |
相关代理商/技术参数 |
参数描述 |
|---|---|
| XRP6124ESTR0.5-F | 功能描述:DC/DC 开关控制器 PFET controllers w/ Cnstnt OnTime Cntrl RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| XRP6124EVB | 制造商:Exar Corporation 功能描述:XRP6124EVB 制造商:Exar Corporation 功能描述:EVAL BOARD, XRP6124, PFET STEP DOWN CTRLR, 18V; Silicon Manufacturer:Exar; Kit Application Type:Power Management; Application Sub Type:Buck Controller |
| XRP6124HVES0.5-F | 功能描述:DC/DC 开关控制器 PFET controllers w/ Cnstnt OnTime Cntrl RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| XRP6124HVESTR0.5-F | 功能描述:DC/DC 开关控制器 PFET controllers w/ Cnstnt OnTime Cntrl RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| XRP6124HVEVB | 制造商:Exar Corporation 功能描述:XRP6124HVEVB 制造商:Exar Corporation 功能描述:EVAL BOARD, XRP6124, PFET STEP DOWN CTRLR, 30V; Silicon Manufacturer:Exar; Kit Application Type:Power Management; Application Sub Type:Buck Controller |
发布紧急采购，3分钟左右您将得到回复。