参数资料
型号: LTC3520EUF#PBF
厂商: Linear Technology
文件页数: 18/24页
文件大小: 0K
描述: IC REG BUCK BOOST SYNC ADJ 24QFN
标准包装: 91
类型: 降压(降压),升压(升压)
输出类型: 可调式
输出数: 2
输出电压: 0.8 V ~ 5.5 V
输入电压: 2.2 V ~ 5.5 V
PWM 型: 电流模式,混合
频率 - 开关: 100kHz ~ 2MHz
电流 - 输出: 600mA,1A
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: 24-WFQFN 裸露焊盘
包装: 管件
供应商设备封装: 24-QFN 裸露焊盘(4x4)
产品目录页面: 1334 (CN2011-ZH PDF)
LTC3520
APPLICATIONS INFORMATION
Capacitor Vendor Information
Both the input and output capacitors used with the LTC3520
where L is the inductance in henries and C OUT is the output
capacitance in farads. The output ?lter zero is given by:
must be low ESR and designed to handle the large AC cur-
rents generated by switching converters. The vendors in
Table 4 provide capacitors that are well suited to LTC3520
f FILTER _ ZERO =
1
2 π R ESR C OUT
Hz
application circuits.
Table 4. Capacitor Vendor Information
where R ESR is the equivalent series resistance of the output
capacitor. A challenging aspect of the loop dynamics in
boost mode is the presence of a right half plane zero at
MANUFACTURER WEB SITE
PART NUMBER
the frequency given by:
Taiyo Yuden
TDK
www.t-yuden.com
www.component.tdk.com
JMK212BJ226MG-T
22μF, 6.3V
C3216X5ROJ106KB
10μF, 6.3V
f RHPZ =
V IN 2
2 π I OUT LV OUT
Hz
Sanyo
Murata
www.secc.co.jp
www.murata.com
6APD10M 10μF, 6.3V
GRM21BR60J226ME39
22μF, 6.3V
The loop gain is typically rolled off to below unity gain
before the worst case right half plane zero frequency.
A simple Type I compensation network as shown in
Closing the Buck-Boost Feedback Loop
The LTC3520 buck-boost converter employs voltage mode
PWM control. The control to output gain varies with opera-
tional region (buck, boost, or buck-boost), but is usually
no greater than 24dB. The output ?lter exhibits a double
pole response as given by the following equations:
Figure 6 can be utilized to stabilize the buck-boost
converter. However, this will yield a relatively low band-
width and slow transient response. To ensure suf?cient
phase margin using Type I compensation, the loop must
be crossed over a decade before the LC double pole fre-
quency. The unity-gain frequency of the error ampli?er
with Type I compensation is given by:
f FILTER _ POLE =
1
2 π LC OUT
Hz ( Buck Mode )
f UG =
1
2 π R 1 C P 1
Hz
f FILTER _ PO L E =
1
2 π V OUT LC OUT
Hz ( Boost Mode )
+
0.782V
FB1
18
V OUT
R1
V C1
15
C P1
R2
3520 F06
Figure 6. Type I Compensation Network
3520fa
18
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LTC3521EFE#PBF 功能描述:IC REG BUCK BST SYNC ADJ 20TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压(降压) 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON(1.45x1) 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2