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参数资料
| 型号： | XRP6142EL1-0-F |
| 厂商： | Exar Corporation |
| 文件页数： | 9/17页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR STEP-DWN SYNC 16QFN |
| 特色产品： | XRP6142 Synchronous Step-Down Controllers |
| 标准包装： | 1 |
| 应用： | 控制器，DDR，DDR2，DDR3 |
| 输入电压： | 1 V ~ 5.5 V |
| 输出数： | 1 |
| 输出电压： | 0.5 V ~ 5 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-VFQFN 裸露焊盘 |
| 供应商设备封装： | 16-QFN（3x3） |
| 包装： | 散装 |
| 配用： | 1016-1334-ND - EVAL BOARD FOR XRP6142 |
| 其它名称： | 1016-1332 |
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
R 1 = R 2 ? ? OUT ? 1 ? ?
? ? IOCP + 2 ? × R DS ( ON ) ? + 20 mV
RLIM = ?
? V ? ( 0 . 5 × V OUT , ripple ) ?
R 1 = R 2 ? OUT ? 1 ?
to be recycled in order for IC to resume
operation.
O VERCURRENT P ROTECTION (OCP)
OCP function is implemented by monitoring
the voltage across the low-side FET when it is
on. OCP is programmed via a resistor RLIM
connected between ILIM and SW pins. An
internal constant-current source ILIM (50uA
nominal) establishes a voltage across RLIM.
This voltage sets the trip point of the OCP
comparator. If the OCP comparator is
triggered for eight consecutive switching
cycles, then a hiccup timeout, as described in
the next section, is initiated. Calculate RLIM
from:
? ? Δ IL ? ?
? ? ?
42 . 5 μ A
Where:
IOCP is the output current at which
overcurrent protection is activated (usually set
20% above maximum I OUT )
? IL is inductor current ripple nominally set at
30% of I OUT
R DS(ON) is the maximum rated on resistance of
the FET
20mV is the OCP comparator offset spec
42.5 μ A is the minimum spec of the ILIM
source
The actual IOCP is 50% to 100% higher than
expected IOCP as seen in figure 11. This is
because RLIM in the above equation is
calculated based on worst case parameters.
A temperature coefficient of 0.3%/°C has been
designed into ILIM. This useful feature nulls
out the positive temperature coefficient of the
FET R DS(ON) to a first order. Thus IOCP should
be largely independent of operating
temperature.
H ICCUP T IMEOUT
When an over current condition is detected,
the internal FET drivers are turned off for
110ms, following which, a soft-start is
attempted. If the OCP condition is still present,
then the timeout and soft-start cycle repeat.
This is referred to as hiccup timeout.
P ROGRAMMING V OUT
A pair of output resistors is used to set the
output voltage V OUT . Calculate R1 from:
? V ?
? V REF ?
Where:
R2 is nominally set at 10k (bottom resistor)
V REF is reference voltage (0.5V)
Note that V OUT must contain some voltage
ripple in order for XRP6142 to regulate the
output. Since XRP6142 regulates the bottom
of the output ripple the average value will be
higher (see figure 16).
Fig. 16: V OUT Voltage Ripple
V OUT can be programmed more precisely from:
? V REF ?
Where:
V OUT , ripple = Δ IL × ESR
ESR is the output capacitor’s Equivalent Series
Resistance.
O UTPUT C APACITOR
C OUT is the most critical component for proper
operation, since the XRP6142 relies on V OUT
? 2010 Exar Corporation
Page 9 of 17
Rev. 1.0.0
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相关代理商/技术参数 |
参数描述 |
|---|---|
| XRP6142EL2-0-F | 功能描述:开关变换器、稳压器与控制器 Low Volt. Controller with DDR - 2000ns 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 |
| XRP6142ELTR0-5-F | 功能描述:开关变换器、稳压器与控制器 Low Volt. Controller with DDR - 500ns 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 |
| XRP6142ELTR1-0-F | 功能描述:开关变换器、稳压器与控制器 Low Volt. Controller with DDR - 1000ns 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 |
| XRP6142ELTR2-0-F | 功能描述:开关变换器、稳压器与控制器 Low Volt. Controller with DDR - 2000ns 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 |
| XRP6142EVB | 功能描述:电源管理IC开发工具 Evaluation Board for XRP6142 Series 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 |
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