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| 型号： | CS5171ED8G |
| 厂商： | ON Semiconductor |
| 文件页数： | 14/21页 |
| 文件大小： | 0K |
| 描述： | IC REG MULTI CONFIG 1.5A 8SOIC |
| 产品变化通告： | Product Discontinuation 27/Jan/2012 |
| 标准包装： | 98 |
| 类型： | 升压（升压），回扫，正向转换器，Sepic |
| 输出数： | 1 |
| 输入电压： | 2.7 V ~ 30 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 280kHz |
| 电流 - 输出： | 1.5A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 8-SOICN |
CS5171, CS5172, CS5173, CS5174
Summing up, the output voltage peak ? peak ripple can be
calculated by:
Unfortunately, such a simple circuit is not generally
acceptable if V IN is loosely regulated.
VOUT(RIPPLE) + IN
(I
* IOUT)(1 * D)
(COUT)(f)
V IN
) IIN
IOUTD
(COUT)(f)
VOUT(RIPPLE) + OUT
) ESR
The equation can be expressed more conveniently in
terms of V CC , V OUT and I OUT for design purposes as
follows:
I (VOUT * VCC)
1
(COUT)(f)
(COUT)(f)
R2
D1
V CC
V C
) OUT
(I
)(VOUT)(ESR)
VCC
R3
R1
The capacitor RMS ripple current is:
IRIPPLE + (IIN * IOUT)2(1 * D) ) (IOUT)2(D)
C1
C2
+ IOUT
VOUT * VCC
VCC
Figure 37. Current Limiting using a Diode Clamp
Although the above equations apply only for boost
circuits, similar equations can be derived for flyback
circuits.
Reducing the Current Limit
In some applications, the designer may prefer a lower
limit on the switch current than 1.5 A. An external shunt can
Another solution to the current limiting problem is to
externally measure the current through the switch using a
sense resistor. Such a circuit is illustrated in Figure 38.
V CC
be connected between the V C pin and ground to reduce its
clamp voltage. Consequently, the current limit of the
PGND AGND
V C
C2
RSENSE
internal power transistor current is reduced from its nominal
value.
The voltage on the V C pin can be evaluated with the
equation
VC + ISWREAV
where:
R E = .063 W , the value of the internal emitter resistor;
A V = 5 V/V, the gain of the current sense amplifier.
Since R E and A V cannot be changed by the end user, the
only available method for limiting switch current below
1.5 A is to clamp the V C pin at a lower voltage. If the
maximum switch or inductor current is substituted into the
equation above, the desired clamp voltage will result.
A simple diode clamp, as shown in Figure 37, clamps the
V C voltage to a diode drop above the voltage on resistor R3.
V IN
R1
C1
R2
Q1
C3
Output
R SENSE Ground
Figure 38. Current Limiting using a Current Sense
Resistor
The switch current is limited to
VBE(Q1)
ISWITCH(PEAK) +
where:
V BE(Q1) = the base ? emitter voltage drop of Q1, typically
0.65 V.
http://onsemi.com
14
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相关代理商/技术参数 |
参数描述 |
|---|---|
| CS5171EDR8 | 功能描述:直流/直流开关调节器 1.5A High Efficiency RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| CS5171EDR8G | 功能描述:直流/直流开关调节器 1.5A High Efficiency Boost RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| CS5171GD8 | 功能描述:直流/直流开关调节器 1.5A High Efficiency RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| CS5171GD8G | 功能描述:直流/直流开关调节器 1.5A High Efficiency Boost RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| CS5171GDR8 | 功能描述:直流/直流开关调节器 1.5A High Efficiency RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
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