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S P 7 6 4 8
L o w R e f e r e n c e H i g h E f f i c i e n c y B o o s t R e g u l a t o r
cycle. However, full load is not yet achieved
because at the end of the minimum discharge
time the output was still within regulation.
Maximum load is reached when this discharge
time has shrunk to the minimum allowed value
T OFF as shown in Plot E of Figure 14.
C OMPONENT S ELECTION
Selection of capacitors for SP7648 power
supply circuits can be made through the use of
the Component Selection Table. Capacitor
equivalent series resistance (ESR) in the range
of 0.2 to 0.3 ? is a requirement for obtaining
sufficient output voltage ripple for the SP7648
to properly regulate under its load. For
example, in the SP7648 application circuit a
10μF, 10V, X5R, surface mount ceramic output
filter capacitor is used. Ceramic capacitors
have an ESR too low to produce enough
output ripple for the SP7648 to regulate the
output; therefore, a 0.33 ? resistor is added in
series with the 10μF capacitor at the V OUT pin.
Designers should select input and output
capacitors with a rating exceeding the inductor
current ripple, which is typically set by the
inductor value and the K ON value as given in
the following relationship:
I
L(RIPPLE)
= K ON /L, where K ON = 3.5V*μS
Fig. 14: Inductor Current versus Load
Table 1: Component Selection
? 2012 Exar Corporation
8/13
Rev. 2.0.0
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相关代理商/技术参数
SP7648ER 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Low Reference High Efficiency Boost Regulator
SP7648ER/TR 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:PackageLow Reference High efficiency Boost Regulator
SP7648ER-L 功能描述:LED照明驱动器 Efficiency Boost Regulator RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N
SP7648ER-L/TR 功能描述:DC/DC 开关控制器 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
SP7648EU 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Evaluation Board Manual
SP7648EU/TR 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Low Reference High Efficiency Boost Regulator
SP7648EU-L 功能描述:DC/DC 开关控制器 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
SP7648EU-L/TR 功能描述:DC/DC 开关控制器 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