- 您现在的位置：买卖IC网 > PDF目录15371 > SP6137EU-L/TR (Exar Corporation)IC REG CTRLR BUCK PWM VM 10-MSOP PDF资料下载
参数资料
| 型号： | SP6137EU-L/TR |
| 厂商： | Exar Corporation |
| 文件页数： | 11/15页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 10-MSOP |
| 标准包装： | 2,500 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1.04MHz |
| 占空比： | 100% |
| 电源电压： | 4.5 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： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 包装： | 带卷 (TR) |
S P 6 1 3 7
W i d e I n p u t , 9 0 0 k H z S y n c h r o n o u s P W M S t e p D o w n
C o n t r o l l e r
f Z ( ESR ) =
f P ( LC ) =
copper pad directly under the package,
without occupying additional board space, can
increase the maximum power from
approximately 1 to 1.2W. For DPAK package,
enlarging the tap mounting pad to 1 square
inches reduces the R Θ JA from 96°C/W to
40°C/W.
S CHOTTKY D IODE S ELECTION
When paralleled with the bottom MOSFET, an
optional Schottky diode can improve efficiency
and reduce noises. Without this Schottky
diode, the body diode of the bottom MOSFET
conducts the current during the non-overlap
time when both MOSFETs are turned off.
Unfortunately, the body diode has high
forward voltage and reverse recovery problem.
The reverse recovery of the body diode causes
additional switching noises when the diode
turns off. The Schottky diode alleviates these
noises and additionally improves efficiency
thanks to its low forward voltage. The reverse
voltage across the diode is equal to input
voltage, and the diode must be able to handle
the peak current equal to the maximum load
current.
The power dissipation of the Schottky diode is
determined by
P Diode = 2 V F I OUT T NOL F S
where
TNOL = non-overlap time between GH and GL.
VF = forward voltage of the Schottky diode.
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
crossover at the selected frequency FCO, the
gain of the error amplifier has to compensate
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. 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:
1
2 π C OUT R ESR
The next step is to calculated the complex
conjugate poles contributed by the LC output
filter,
1
2 π LC
When the output capacitors are of a Ceramic
Type, the SP6137CU Evaluation Board requires
a Type III compensation circuit to give a
phase boost of 180° in order to counteract the
effects of an under damped resonance of the
output filter at the double pole frequency.
? 2008 Exar Corporation
11/15
Rev. 2.0.0
相关PDF资料 |
PDF描述 |
|---|---|
| 2727-12J | INDUCTOR TOROID 82UH SHIELD RADL |
| ABM10DRKN | CONN EDGECARD 20POS DIP .156 SLD |
| VI-B1K-EV-F3 | CONVERTER MOD DC/DC 40V 150W |
| ABC07DRES-S734 | CONN EDGECARD 14POS .100 EYELET |
| ACM10DRKH | CONN EDGECARD 20POS DIP .156 SLD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| SP6137HCU | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Dual Supply Synchronous Buck Controller |
| SP6137HCU/TR | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Dual Supply Synchronous Buck Controller |
| SP6137HEU | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Dual Supply Synchronous Buck Controller |
| SP6137HEU/TR | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Dual Supply Synchronous Buck Controller |
| SP6137HV | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Dual Supply Synchronous Buck Controller |
发布紧急采购，3分钟左右您将得到回复。