参数资料
| 型号： | SP6120EY-L |
| 厂商： | Exar Corporation |
| 文件页数： | 12/22页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 16TSSOP |
| 标准包装： | 95 |
| 系列： | AnyFET™ |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 550kHz |
| 占空比： | 95% |
| 电源电压： | 3 V ~ 5.5 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 ~ 85°C |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm 宽） |
| 包装： | 管件 |
THEORY OF OPERATIONS: Continued
The NFET/PFET programmability is for the
high side MOSFET. When designing DC/DC
converters, it is not always obvious when to use
an NFET with a charge pump or a simple PFET
for the high side MOSFET. Often, the controller
has to be changed, making performance evalu-
ations difficult. This difficulty is worsened by
the limited availability of true low voltage con-
trollers. In addition, by also programming the
mode, continuous or discontinuous, switch mode
power designs that are successful in bus applica-
tions can now find homes in portable applica-
tions.
Secondary Loop (3% Window Comparator)
DSP, microcontroller and microprocessor ap-
plications have very strict supply voltage re-
quirements. In addition, the current require-
ments to these devices can change drastically.
Linear regulators, typically the workhorse for
DC/DC step-down, do a great job managing
accuracy and transient response at the expense
of efficiency. On the other hand, PWM switch-
ing regulators typically do a great job managing
efficiency at the expense of output ripple and
line/load step response. The trick in PWM
controller design is to emulate the transient
response of the linear regulator.
Of course improving transient response should
be transparent to the power supply designer.
Very often this is not the case. Usually the very
circuitry that improves the controllers transient
response adversely interferes with the main
PWM loop or complicates the board level de-
sign of the power converter.
The SP6120 handles line/load transient response
in a new way. First, a window comparator
detects whether the output voltage is above or
below the regulated value by 3%. Then, a
proprietary “Ripple & Frequency Independent”
algorithm synchronizes the output of the win-
dow comparator with the peak and valley of the
inductor current waveform. 3% low detection is
synchronized with inductor current peak; 3%
high detection is synchronized with the inductor
current valley. However, in order to eliminate
Secondary Loop (continued)
any additional loops, the current peak and val-
ley are determined by the edges associated with
the on-time in the main loop. The set pulse
corresponding to the start of an on-time indi-
cates a current valley and the reset pulse corre-
sponding to the end of an on-time indicates a
current peak. In effect, the main loop deter-
mines the status of the secondary loop.
Notice that the output voltage appears to coast
toward the regulated value during periods where
the main loop would be telling the drivers to
MAX
DC Load
Current
MIN
0A
Output
Voltage
V OUT
.
Reset
Main Loop
Set
V(V CC )
3% High
Latch On
0V
V(V CC )
3% Low
Latch On
0V
TIME
Date: 1/21/05
SP6120 Low Voltage, AnyFET TM , Synchronous, Buck Controller
12
? Copyright 2005 Sipex Corporation
相关PDF资料 |
PDF描述 |
|---|---|
| SP6121CN-L | IC REG CTRLR BUCK PWM VM 8NSOIC |
| SP6123CN-L | IC REG CTRLR BUCK PWM VM 8NSOIC |
| SP6125EK1-L/TR | IC REG CTRLR BUCK PWM VM 6TSOT |
| SP6126EK1-L | IC REG CTRLR BUCK PWM VM 6TSOT |
| SP6127EK1-L/TR | IC REG CTRLR BUCK PWM VM 6TSOT |
相关代理商/技术参数 |
参数描述 |
|---|---|
| SP6120EY-L/TR | 功能描述:DC/DC 开关控制器 Low Voltage, AnyFET Synchronous, Cntrllr 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 |
| SP6120HV | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:High Voltage, Synchronous ,Buck Controller Ideal for 2A to 20A, High Performance, DC-DC Power Converters |
| SP6120HVCY | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:High Voltage, Synchronous ,Buck Controller Ideal for 2A to 20A, High Performance, DC-DC Power Converters |
| SP6120HVCY/TR | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:High Voltage, Synchronous ,Buck Controller Ideal for 2A to 20A, High Performance, DC-DC Power Converters |
| SP6120HVEY | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:High Voltage, Synchronous ,Buck Controller Ideal for 2A to 20A, High Performance, DC-DC Power Converters |
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