参数资料
型号: MC34848EP
厂商: Freescale Semiconductor
文件页数: 30/38页
文件大小: 0K
描述: IC LED DVR BACKLIGHT 8CH 48QFN
产品变化通告: AMPD Product Discontinuation 12/Dec/2012
标准包装: 260
恒定电流:
恒定电压:
拓扑: PWM,升压(升压)
输出数: 8
内部驱动器:
类型 - 主要: 背光
频率: 200kHz ~ 1.2MHz
电源电压: 2.6 V ~ 3.6 V
输出电压: 45V
安装类型: 表面贴装
封装/外壳: 48-VFQFN 裸露焊盘
供应商设备封装: 48-QFN-EP(7x7)
包装: 托盘
工作温度: -40°C ~ 85°C
TYPICAL APPLICATIONS
where,
? G ?
A = 10
? ?
? 20 ?
?
G = ABS ( 20 × log G ( s ) ) = ABS ? 20 × log G 0
?
? ? 1 +
? ? ? ? 1 ?
? ? 1 +
? ? ? ? 1 +
s ?
F RHP ? ?
s ?
F P 2 ? ?
?
?
( 1 ? D )
F ESR =
?
?
?
?
V OUT
I OUT
G 0 =
R MAP × K D
1
2 π × ESR × C OUT
? s ? ?
? s ? ?
? F P 1 ? ?
? F ESR ? ?
?
?
?
?
?
?
?
? ? ( 1 ? D ) 2
? ?
F RHP = ? OUT ?
1 ? 2 I OUT
F P 1 =
2 π × C OUT ? ? V OUT
( 1 ? D ) 2 ? ? 1 + K ? ? ? ?
F P 2 =
? V OUT ?
I
2 π × L
?
K M R MAP
2 π × L
+
? ? ?
R MAP ? K M 1 ? D ? ?
( 1 ? D ) 2
K D = 2 + OUT
? ?
K ?
1 ? D ? ?
V OUT
I
R MAP
? 1
? K M
+
?
( 0 . 5 ? D ) × R MAP × ? ?
? ?
K M =
1
? 1
? L × f SW
+
V PP
V OUT
?
?
× ? 1 ?
0 . 18 ? R MAP
V PP =
V OUT ? V IN
L
?
?
? ×
D ? f SW
K = 0 . 5 × R MAP ×
D ( 1 ? D )
L × f SW
In order to determine the value of the R COMP resistor it is
necessary to choose the crossover frequency. Although the
typical target is one-third of the switching frequency, it is
necessary to confirm that this crossover frequency is
significantly below the location of the RHP zero. As a result,
one fifth of the RHP frequency it′s a good approach. Then:
34848
Analog Integrated Circuit Device Data
30
Freescale Semiconductor
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