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参数资料
| 型号： | SP6648EB |
| 厂商： | Exar Corporation |
| 文件页数： | 5/16页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR SP6648 |
| 标准包装： | 1 |
| 系列： | * |
THEORY OF OPERATION: Continued
At light loads (as shown in plot A in Figure 1 )
the charge cycle will last the maximum value for
Inductor Current vs. Load
llim
t ON : For a 1V battery this would be as follows:
t ON = K ON / V BATT = 4.0V μ s / 1V = 4.0 μ s
Ton Max.
Toff Min.
E. Iripple=Toff* (Vo - Vi)/L
E
llim
The current built up in the coil during the charge
Ton Max.
Toff Min.
D. Toff*= (Vo - Vi)/L<Iripple<Ton*Vi/L
D
cycle gets fully discharged in the discontinuous
conduction mode (DCM). When the current in
the coil has reached zero, the synchronous rec-
Ton Max.
Toff Min.
C. Iripple=Ton*Vi/L
llim
C
tifier switch is opened and the voltage across the
coil (from V BATT to LX) is shorted internally to
eliminate inductive ringing.
Ton Max.
Toff Min.
B. Iripple=Ton*Vi/L
llim
B
With increasing load (as shown in plot B in
Figure 1 ) this inductor damping time becomes
shorter, because the output will quickly drop
Ton Max.
Toff Min.
A. Iripple=Ton*Vi/L
llim
A
below its regulation point due to heavier load. If
the load current increases further, the SP6648
enters continuous conduction mode (CCM)
where there is always current flowing in the
inductor. The charge time remains at maximum
t ON as long as the inductor peak current limit is
not reached as shown in plot C in Figure 1 . The
inductor peak current limit can be programmed
by tying a resistor R LIM from the R LIM pin to
ground where:
I PEAK = 1600 / R LIM
When the peak current limit is reached the
charge time is short-cycled.
In plot D of Figure 1 , the switch current reaches
the peak current limit during the charge period
Figure 1. Inductor Current vs. Load
which ends the charge cycle and starts the dis-
charge cycle. However, full load is not yet
achieved because at the end of the minimum
discharge time the output was still within regu-
lation.
Maximum load is reached when this discharge
time has shrunk to the minimum allowed value
T OFF as shown in Plot E of Figure 1 .
Date: 6/7/06 Rev B
SP6648 Ultra-low Quiescent Current, High Efficiency Boost Regulator
5
? 2006 Sipex Corporation
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP6648ER | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Ultra-low Quiescent Current, High Efficiency Boost Regulator |
| SP6648ER/TR | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Ultra-low Quiescent Current, High Efficiency Boost Regulator |
| SP6648ER-L | 功能描述:DC/DC 开关控制器 Efficiency Boost 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 |
| SP6648ER-L/TR | 功能描述:DC/DC 开关控制器 Ultra-low Quiescent High Efficiency 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 |
| SP6648EU | 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述: |
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