参数资料
型号: SC493ULTRT
厂商: Semtech
文件页数: 19/28页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM MLPQ-20
标准包装: 1
系列: EcoSpeed®, SmartDrive™
PWM 型: 控制器
输出数: 1
频率 - 最大: 1MHz
电源电压: 3 V ~ 5.5 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 85°C
封装/外壳: 20-MLPQ
包装: 标准包装
其它名称: SC493ULTRTDKR
SC493
Applications Information (continued)
I INJ
V IN
V OUT
R L
The ripple due to the capacitance ESR alone is shown
by the next equation.
C L
C C
R 1 R 2
R 1 R 2
V ESR _ RIPPLE ) 2
V FB _ RIPPLE
( V INJ
V COUT _ RIPPLE
V INJ
V FB
V FB _ RIPPLE
2
ThefollowingdescribesonewaytodesignthevirtualESR
circuit.
1
2 f SW
The current through resistance R L will all go through C L and
the voltage change through capacitor C L will be shown by
the next equation.
V IN V OUT t ON
R L C L
All of this voltage will be coupled into the FB pin if the
rules previously stated are followed. Note that the output
ripple voltage has not been taken into account. The
output voltage ripple will also be coupled through the C L
and C C path into the FB pin. The ripple voltage at the
output due to the output capacitance (ignoring the
V ESR_RIPPLE = I RIPPLE x R ESR
The output ripple voltage due to output capacitance has
a 90° phase lag with respect to the ripple voltage gener-
ated by the virtual ESR. The actual ripple voltage seen at
the FB pin (VFB_RIPPLE) can be approximated by the next
equation.
2
Resistor Divider Selection
The DC voltage at the FB pin is shown by the next equation.
0 . 5 V
The resistor divider value should be selected using the
next equation.
V COUT _ RIPPLE
capacitanceESR)isshownbythenextequation.
I RIPPLE
8 C OUT f SW
V OUT
V FB
R 1 R 2
R 2
19
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