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参数资料
| 型号： | SP7652EB |
| 厂商： | Exar Corporation |
| 文件页数： | 11/15页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR SP7652 |
| 标准包装： | 1 |
| 系列： | * |
S P 7 6 5 2
P o w e r b l o x T M
6 A 2 8 V 6 0 0 K H z S y n c h r o n o u s S t e p D o w n R e g u l a t o r
ripple current, the input voltage ripple can be
determined by:
The capacitor type suitable for the output
capacitors can also be used for the input
capacitors. However, exercise additional
caution when tantalum capacitors are used.
Tantalum capacitors are known for
catastrophic failure when exposed to surge
current, and input capacitors are prone to
such surge current when power supplies are
connected “live” to low imp edance power
sources.
L OOP C OMPENSATION D ESIGN
The open loop gain of the whole system can
be divided into the gain of the error amplifier,
PWM modulator, buck converter output stage,
and feedback resistor divider. In order to cross
High crossover frequency is desirable for fast
transient response, but often jeopardizes the
system stability. Crossover frequency should
be higher than the ESR zero but less than 1/5
of the switching frequency. The ESR zero is
contributed by the ESR associated with the
output capacitors and can be determined by:
The next step is to calculate the complex
conjugate poles contributed by the LC output
filter,
When the output capacitors are of a Ceramic
Type, the SP7652 Evaluation Board requires a
Type III compensation circuit to give a phase
boost of 180° in order to counteract the
effects of an underdamped resonance of the
output filter at the double pole frequency
over at the selected frequency fcoFCO, the
gain of the error amplifier compensates for the
attenuation caused by the rest of the loop at
this frequency.
The goal of loop compensation is to
manipulate loop frequency response such that
its gain crosses over 0db at a slope of -
20db/dec. The first step of compensation
design is to pick the loop crossover frequency.
Fig. 12: SP7652 Voltage Mode Control Loop
? 2012 Exar Corporation
11/15
Rev. 2.0.0
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP7652ER | 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述: |
| SP7652ER/TR | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Wide Input Voltage Range 6A, 600kHz, Buck Regulator |
| SP7652ERL | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Wide Input Voltage Range 6A, 600kHz, Buck Regulator |
| SP7652ER-L | 功能描述:电压模式 PWM 控制器 Buck Regulator 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 |
| SP7652ERL/TR | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Wide Input Voltage Range 6A, 600kHz, Buck Regulator |
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