参数资料
型号: SC2440TETRT
厂商: Semtech
文件页数: 19/26页
文件大小: 0K
描述: IC REG BUCK 2A DL 16TSSOP
标准包装: 1
类型: 降压(降压)
输出数: 2
输入电压: 2.8 V ~ 20 V
PWM 型: 电流模式
频率 - 开关: 1.4MHz
电流 - 输出: 2A
同步整流器:
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 16-TSSOP(0.173",4.40mm)裸露焊盘
包装: 标准包装
供应商设备封装: 16-TSSOP
产品目录页面: 1358 (CN2011-ZH PDF)
其它名称: SC2440TEDKR
SC2440
POWER MANAGEMENT
Applications Information
= ? ?
? ? ?
( )
? R 1 + R 2 ? ? 1 + s R 1 ?? R 2 C 11 ?
v FB
v OUT
? R 2 ? ? 1 + sC 11 R 1 ?
?
(9)
forms a high frequency pole p 3 with R 5 . Using the
component values shown in Figure 1 for the 12V to 3.3V
regulator (1.3MHz),
R O =
=
ω p 1 = ?
= ?
and
v COMP
v FB
G MA R O ( 1 + sC 5 R 5 )
( 1 + sC 5 R O ) ? ( 1 + sC 6 R 5 )
(10)
Amplifier Open Loop Gain
Transcondu c tan ce
1 1
R O C 5 1 . 6 M ? ? 470 pF
53 dB
280 μ ? ? 1
= 1 . 6 M ?
ω p 3 = ?
= ?
provided that C 5 >> C 6 and R O >> R 5 .
In Equation (10), C 5 forms a low frequency pole p 1 with
the output resistance R O of the error amplifier and C 6
Gain
T ( j ω )
= ? 1 . 3 Krads ? 1 = ? 210 Hz
1 1
R 5 C 6 15 . 4 K ? ? 10 pF
= ? 6 . 5 Mrads ? 1 = ? 1 . 0 MHz
G MA R O ? ?
? ?
?
?
R 2
R 1 + R 2
?
?
v COMP
G MA R 5 ??
?
?
?
R 2 ?
R 1 + R 2 ? ?
G MP R OUT
ω C C 1 R OUT
n
v OUT
1
1
n
1
R O C 5
ω p 1
R 5 C 5
ω Z 1
R OUT C 1
ω p 2
ω C
R 5 C 6
ω p 3
ω S
ω
2
Control-to-Output
Transfer Function
Figure 13. Bode Plots of Control-to-Ouput, Output-to-Control and the Overall Loop
Gain. Control-to-output transfer function is shown with two poles near
half the switching frequency ω S .
? 2005 Semtech Corp.
19
www.semtech.com
相关PDF资料
PDF描述
SC2443MLTRT IC DUAL SYNC STP-DN CTRLR 24MLPQ
SC2446ITETRT IC SYNC STEP DOWN CTRLR 28-TSSOP
SC2544TSTRT IC REG CTRLR BUCK PWM VM 24TSSOP
SC2595MLTRT IC DDR TERMINATION REG 16-MLPQ
SC2596STRT IC INTEGRTD DDRII TERM REG 8SOIC
相关代理商/技术参数
参数描述
SC2441 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Very Low Input Voltage 2-Phase Synchronous Step-down Controllers with Step-up Converter
SC2441A 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:1.8V to 20V Input 2-Phase Synchronous Step-down Controllers with Step-up Converter
SC2441A_09 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:1.8V to 20V Input 2-Phase Synchronous Step-down Controllers with Step-up Converter
SC2441AEVB 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:1.8V to 20V Input 2-Phase Synchronous Step-down Controllers with Step-up Converter
SC2441ATETRT 制造商:Semtech Corporation 功能描述: