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参数资料
| 型号： | LT3579EFE-1#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, PDSO20 |
| 封装： | 4.40 MM, LEAD FREE, PLASTIC, TSSOP-20 |
| 文件页数： | 5/40页 |
| 文件大小： | 503K |
| 代理商： | LT3579EFE-1#PBF |
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LT3579/LT3579-1
13
35791f
applicaTions inForMaTion
Figure 6. Boost Converter – The Component Values Given Are
Typical Values for a 1MHz, 5V to 12V Boost
BOOST CONVERTER COMPONENT SELECTION
OPTIONAL
VIN
5V
CIN
22F
RT
86.6k
COUT1
10F
RGATE
6.3k
RC
8k
CC
2.2nF
CF
47pF
CSS
0.1F
RFB
130k
VOUT
12V
1.7A
VIN
COUT
10F
L1
2.2H
D1
30V, 4A
SW1 SW2
GATE
VIN
RT
VC
FAULT
SHDN
FB
SS
GND
SYNC
CLKOUT
LT3579
35791 F06
100k
200k
M1
The LT3579 can be configured as a Boost converter as in
Figure 6. This topology allows for positive output voltages
that are higher than the input voltage. An external PMOS
(optional)drivenbytheGATEpinoftheLT3579canachieve
input or output disconnect during a FAULT event. A single
feedback resistor sets the output voltage. For output
voltages higher than 40V, see the Charge Pump topology
in the Charge Pump Aided Regulators section.
Table 1 is a step-by-step set of equations to calculate
component values for the LT3579 when operating as a
Boost converter. Input parameters are input and output
voltage, and switching frequency (VIN, VOUT and fOSC
respectively). RefertotheAppendixforfurtherinformation
on the design equations presented in Table 1.
Variable Definitions:
VIN = Input Voltage
VOUT = Output Voltage
DC = Power Switch Duty Cycle
fOSC = Switching Frequency
IOUT = Maximum Output Current
IRIPPLE = Inductor Ripple Current
RDSON_PMOS = RDSON of External PMOS (set to 0 if not
using PMOS)
Table 1. Boost Design Equations
PARAMETERS/EQUATIONS
Step 1:
Inputs
Pick VIN, VOUT, and fOSC to calculate equations below.
Step 2:
DC
DC
VOUT – VIN + 0.5V
VOUT + 0.5V – 0.27V
Step 3:
L1
LTYP =
VIN – 0.27V
(
) DC
fOSC 1.8A
LMIN =
VIN – 0.27V
(
) 2 DC – 1
(
)
4A
fOSC 1 – DC
(
)
LMAX =
VIN – 0.27V
(
) DC
fOSC 0.5A
(1)
(2)
(3)
Solve equations 1, 2, and 3.
Choose the higher value between LTYP and LMIN for L1.
L1 should never exceed LMAX.
Step 4:
IRIPPLE
IRIPPLE =
VIN – 0.27V
(
)DC
fOSC L1
Step 5:
IOUT
IOUT = 6A –
IRIPPLE
2
1– DC
(
)
Step 6:
D1
VR > VOUT ;IAVG > IOUT
Step 7:
COUT,
COUT1
COUT =COUT1 =
IOUT DC
fOSC 0.01VOUT –0.5IOUT RDSON_PMOS
(
)
Step 8:
CIN
CIN =CPWR +CVIN
CIN =
IRIPPLE
8 fOSC 0.005 VIN
+
6A
DC
40
fOSC 0.005 VIN
Step 9:
RFB
RFB =
VOUT – 1.215V
83.3A
Step 10:
RT
RT =
87.6
fOSC
–1; fOSC in MHz andRT in k
Step 11:
PMOS
Only needed for input or output disconnect. See PMOS
Selection in the Appendix for information on sizing the PMOS
and the biasing resistor, RGATE.
Note: The maximum design target for peak switch current is 6A and
is used in this table. The final values for COUT and CIN may deviate
from the above equations in order to obtain desired load transient
performance for a particular application.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3579EFE-1-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:6A Boost/Inverting DC/DC Converter with Fault Protection |
| LT3579EFE-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:6A Boost/Inverting DC/DC Converter with Fault Protection |
| LT3579EFE-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:6A Boost/Inverting DC/DC Converter with Fault Protection |
| LT3579EUFD#PBF | 功能描述:IC REG MULTI CONFIG SYNC 20QFN 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:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT3579EUFD#TRPBF | 功能描述:IC REG MULTI CONFIG SYNC 20QFN 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:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
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