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参数资料
| 型号： | SP6650UEB |
| 厂商： | Exar Corporation |
| 文件页数： | 12/17页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR SP6650 |
| 标准包装： | 1 |
| 系列： | * |
S P 6 6 5 0
H i g h E f f i c i e n c y 6 0 0 m A S y n c h r o n o u s B u c k R e g u l a t o r
artificial ramp can be generated
and
times higher
than the switching
period,
superimposed onto the output.
The schematic and description is shown in
Additional Application Circuits.
Another function of the output capacitor is to
hold up the output voltage during the load
transient, and thus prevent excessive
overshoot and undershoot. For that, the
recommended capacitor value is greater than
22uF.
An input capacitor can reduce the peak current
drawn from the battery, improve efficiency,
and significantly reduce high frequency noises
induced by a switching power supply. The
applicable capacitors are tantalum, electrolytic
and ceramic capacitors. An RC filter is
recommended on the V IN pin (pin 2) to
effectively cut down the noise which can
impact the IC control circuit. The time
constant of the RC filter needs to be at least 5
calculated as 1/F LP during CCM.
O UTPUT V OLTAGE P ROGRAMMING
The output voltage can be programmed by the
external voltage divider as shown on page 1.
First pick a resistor value less than 100k for
R3. A large R3 value would reduce the AC
voltage seen by the loop comparator because
the FB pin capacitance (can be as high as
10pF) can form a low pass filter with R3
paralleling with R2. Lack of AC voltage to the
loop comparator would give rise to pulse
jittering and higher output ripple. Once the R3
value is picked, R2 can be calculated from
Designation
INDUCTOR L1
Description
22μH/0.77Arms/0.104DCR
22μH/1.1Arms/0.071DCR
22μH/0.095DCR
47μH/0.76Arms/0.15DCR
47μH/0.72Arms/0.37DCR
Manufacturer
TDK
Murata
Sumida
Murata
Sumida
Part Number
SLF7030T-220MR86
LQS66C220M04
CDRH6D28
LQS66C470M04
CR54
Comments
Shielded
Shielded
Shielded
C2, C3, Input,
Output filter
Capacitors
R2, R3
R1
47μF/350mΩ/500mA
47μF/350mΩ/500 mA
33μF/375mΩ/542 mA
22μF/700mΩ/348 mA
100K/63mW/1% tolerance
10/63mW/5% tolerance
Nemco
AVX
AVX
AVX
Any Approved
LSR47/10C-350
TPSC476010R0350
TPSC336010R0375
TPSB226010R0700
Any package 0402,
0505, 0603, etc…
Table 1
Fig. 19: Additional Application Circuit with Low Output Ripple
? 2012 Exar Corporation
12/17
Rev. 2.0.0
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| SP6651A | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:High Efficiency 800mA Synchronous Buck Regulator Ideal for portable designs powered with Li Ion battery |
| SP6651AEB | 功能描述:DC/DC 开关控制器 Hi Efficiency 800mA Sync Buck Regulator 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 |
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| SP6651AER/TR | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:High Efficiency 800mA Synchronous Buck Regulator Ideal for portable designs powered with Li Ion battery |
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