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参数资料
| 型号： | SP6126EB |
| 厂商： | Exar Corporation |
| 文件页数： | 8/14页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR SP6126 |
| 标准包装： | 1 |
| 系列： | * |
GENERAL OVERVIEW
A sudden decrease in I OUT forces the energy
surplus in L to be absorbed by C OUT . This
causes an overshoot in output voltage that is
corrected by power switch reduced duty cycle.
Use the following equation to calculate C OUT :
Input Capacitor Selection
Select the input capacitor for Voltage,
Capacitance, ripple current, ESR and ESL.
Voltage rating is nominally selected to be twice
Cout = L × ?
I 2 ? I 1
?
?
?
?
2 2
?
Vos 2 - Vout 2 ? ?
the input voltage. The RMS value of input
capacitor current, assuming a low inductor
ripple current ( I RIP ), can be calculated from:
Where:
L is the output inductance
I 2 is the step load high current
I 1 is the step load low current
Vos is output voltage including overshoot
V OUT is steady state output voltage
Output voltage undershoot calculation is more
complicated. Test results for SP6126 buck
Icin = Iout × D ( 1 ? D )
In general total input voltage ripple should be
kept below 1.5% of V IN (not to exceed 180mV).
Input voltage ripple has three components:
ESR and ESL cause a step voltage drop upon
turn on of the MOSFET. During on time
capacitor discharges linearly as it supplies
I OUT -Iin. The contribution to Input voltage ripple
by each term can be calculated from:
circuits show that undershoot is approximately
equal to overshoot. Therefore above equation
provides a satisfactory method for calculating
C OUT .
? V , Cin =
Iout × Vout × ( Vin ? Vout )
fs × Cin × Vin 2
( Iout ? 0 . 5 Irip )
Select ESR such that output voltage ripple
(V RIP ) specification is met. There are two
components to V RIP : First component arises
from charge transferred to and from C OUT
during each cycle. The second component of
V RIP is due to inductor ripple current flowing
through output capacitor’s ESR. It can be
calculated from:
? V , ESR = ESR ( Iout ? 0 . 5 Irip )
? V , ESL = ESL
Trise
Where Trise is the rise time of current through
capacitor
Total input voltage ripple is sum of the above:
Vrip = Irip × ESR 2 + ? ?
? ?
? 1 ?
? 8 × Cout × fs ?
2
? V , Tot = ? V , Cin + ? V , ESR + ? V , ESL
Where:
I RIP is inductor ripple current
f s is switching frequency
C OUT is output capacitor calculated above
Note that a smaller inductor results in a higher
I RIP , therefore requiring a larger C OUT and/or
lower ESR in order to meet V RIP .
Nov07 -08 Rev G
SP6126: TSOT-6 PFET Buck Controller
8
? 200 8 Exar Corporation
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP6126EK1 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Evaluation Board Manual |
| SP6126EK1L | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:High-Voltage, Step Down Controller in TSOT6 |
| SP6126EK1-L | 功能描述:DC/DC 开关控制器 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 |
| SP6126EK1L/TR | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:High-Voltage, Step Down Controller in TSOT6 |
| SP6126EK1-L/TR | 功能描述:电压模式 PWM 控制器 High-Voltage Step Down Controller RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
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