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参数资料
| 型号： | XRP6142EVB |
| 厂商： | Exar Corporation |
| 文件页数： | 8/17页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR XRP6142 |
| 特色产品： | XRP6142 Synchronous Step-Down Controllers |
| 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： | 2.5V |
| 电流 - 输出： | 15A |
| 输入电压： | 3.3 ~ 5.5 V |
| 稳压器拓扑结构： | 降压 |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | XRP6142 |
| 相关产品： | 1016-1333-ND - IC CTRLR STEP-DWN SYNC 16QFN 1016-1332-ND - IC CTRLR STEP-DWN SYNC 16QFN 1016-1331-ND - IC CTRLR STEP-DWN SYNC 16QFN |
| 其它名称： | 1016-1334 |
X R P 6 1 4 2
S y n c h r o n o u s S t e p - D o w n C o n t r o l l e r w i t h D D R
M e m o r y T e r m i n a t i o n
THEORY OF OPERATION
The XRP6142 synchronous buck controller
utilizes the constant-on-time principle. The on-
time is internally set and is available in three
different set points to allow for different
frequency options. The XRP6142 automatically
adjusts the on-time during operation inversely
with the input voltage V IN , to maintain a
constant frequency. Therefore, the switching
frequency is independent of the inductor and
capacitor size, unlike hysteretic controllers.
At the beginning of the cycle, the XRP6142
turns on the high-side FET for a fixed duration.
The on time is internally set and adjusted by
V IN . At the end of the on time, the high-side
FET is turned off, for a predetermined
minimum off time (nominally 300ns). After
T OFF-MIN has expired, the high-side FET will stay
off until the feedback comparator trip point of
0.5V has been reached. Then the high-side
FET turns on again and the cycle repeats. The
operation of the low-side FET is
complementary to the high-side FET. A short
dead-time prevents shoot-through from
occurring.
T IMING O PTIONS
Three versions of XRP6142 (Timing Options)
are identified by their on times at V IN =3.3V.
For each version, T ON is inversely proportional
to V IN . The constant of proportionality K, is
shown in the table below. Variation of T ON
versus V IN is shown graphically in figures 4
and 5.
Part Number T ON at V IN =3.3V K=T ON xV IN
( μ s.V)
frequency is determined by V OUT as shown in
the following table.
f(kHz) for each Timing Option
V OUT
0.5 μ s 1.0 μ s 2.0 μ s
0.8 485 242 121
1.0 606 303 152
1.2 727 364 182
1.5 909 455 227
1.8 1091 545 273
2.5 --- 758 379
3.3 --- --- 500
I NTERNAL S OFT -S TART
Soft-start time is internally set at 5ms
(nominal). This removes the need for external
components associated with soft-start
function, and helps save cost and reduce PCB
space.
E NABLE
A precision enable function is provided (1.20V
±0.05V). EN should be tied to V CC in
applications that do not require this function.
I NTERNAL R EFERENCE V OLTAGE
A high-precision 0.5V internal reference is
provided at the V REF pin. This is normally tied
to the REFIN pin, thus setting the threshold of
the voltage comparator.
I NTERNAL B OOTSTRAP D IODE
XRP6142 includes an internal low-Vf bootstrap
diode. Place a 0.1uF capacitor between BST
and SW pins to provide drive voltage for the
high-side FET.
XRP6142EL0.5-F
XRP6142EL1.0-F
XRP6142EL2.0-F
0.5 μ s
1.0 μ s
2.0 μ s
1.65
3.3
6.6
U NDER -V OLTAGE L OCKOUT
UVLO monitors V CC and ensures adequate
voltage exists before starting to switch the
FETs.
V OUT
Note that for a Buck converter the switching
frequency is given by:
f =
V IN × T ON
Since for each XRP6142 Timing Option, the
product of V IN and T ON is a constant, then
S HORT C IRCUIT P ROTECTION
An internal short-circuit comparator monitors
the feedback voltage. If feedback voltage falls
below 65% of reference voltage (this is
equivalent to output voltage falling below 65%
of nominal value) the IC will latch off. V CC has
? 2010 Exar Corporation
Page 8 of 17
Rev. 1.0.0
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相关代理商/技术参数 |
参数描述 |
|---|---|
| XRP6153EL-F | 功能描述:开关变换器、稳压器与控制器 Synchronization RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| XRP6153EVB | 功能描述:数据转换 IC 开发工具 300kHz Sync Bck Cont w/Frequency Sync RoHS:否 制造商:Texas Instruments 产品:Demonstration Kits 类型:ADC 工具用于评估:ADS130E08 接口类型:SPI 工作电源电压:- 6 V to + 6 V |
| XRP6272IDBTR-F | 功能描述:低压差稳压器 - LDO 2A LDO LOW NOISE 5V AND ADJ OUTPUT RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| XRP6272ITC5TR-F | 功能描述:低压差稳压器 - LDO 2A LDO LOW NOISE 5V AND ADJ OUTPUT RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| XRP6274EH-F | 制造商:Exar Corporation 功能描述:Single Supply LDOs With 140mV Dropout |
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