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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： | 14/40页 |
| 文件大小： | 503K |
| 代理商： | LT3579EFE-1#PBF |
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LT3579/LT3579-1
21
35791f
3.3H
10F
200k
VOUT
18V
1A
VOUT
12V
1.7A
VIN
5V
35791 F12
SW1 SW2
GATE
FB
VC
SS
GND
SYNC
CLKOUT
VIN
RT
SHDN
FAULT
LT3579
SLAVE
10F
×2
10F
×3
8k
100k
110k
3.3nF
0.1F
68pF
47pF
4.7F
86.6k
2.2H
10k
SW1 SW2
GATE
CLKOUT
VC
SS
GND
SYNC
FB
VIN
RT
FAULT
SHDN
LT3579
MASTER
2.2nF
8k
130k
0.1F
Figure 12. Synchronize Multiple LT3579s. The External PMOS
Disconnects the Input from Both Power Paths During FAULT Events
Also, the FAULT pins can be tied together so that a fault
condition from one LT3579 causes all of the LT3579s to
enter fault, until the fault condition disappears.
2-Phase Converters using LT3579-1
The CLKOUT pin on the LT3579-1 is ~180° out of phase
with the internal oscillator, which allows two LT3579-1s to
operate in parallel for a high current, high power output.
The advantage of multiphase converters is that the ripple
current flowing into the output node is divided by the
number of phases or ICs used to generate the output
voltage. The VIN, SHDN, FAULT, FB, and VC pins of all the
LT3579-1sshouldbeconnectedtogether.Figure13shows
a typical application of a 2-phase 12V to 24V boost with
output disconnect.
applicaTions inForMaTion
Clock Synchronization
An external source can set the operating frequency of the
LT3579 by providing a digital clock signal into the SYNC
pin (RT resistor still required). The LT3579 will operate at
the SYNC clock frequency. The LT3579 will revert to its
internal free-running oscillator clock when the SYNC pin is
driven below 0.4V for a few free-running clock periods.
Driving SYNC high for an extended period of time
effectively stops the operating clock and prevents latch
SR1 from becoming set (see Block Diagram). As a result,
the switching operation of the LT3579 will stop and the
CLKOUT pin will be held at ground.
The duty cycle of the SYNC signal must be between 20%
and 80% for proper operation. Also, the frequency of the
SYNC signal must meet the following two criteria:
1.
SYNC may not toggle outside the frequency
range of 200kHz-2.5MHz unless it is stopped
below 0.4V to enable the free-running oscillator.
2.
The SYNC frequency can always be higher than
thefree-runningoscillatorfrequency(assetbythe
RTresistor),fOSC,butshouldnotbelessthan25%
below fOSC.
CLOCK SYNCHRONIzATION OF ADDITIONAL
REGULATORS
The CLKOUT pin of the LT3579 can synchronize additional
switching regulators and/or additional LT3579s as shown
in Figure 12.
The frequency of the master LT3579 is set by the external
RT resistor. The SYNC pin of the slave LT3579 is driven
by the CLKOUT pin of the master LT3579. Note that the
RT pin of the slave LT3579 must have a resistor tied to
ground. It takes a few clock cycles for the CLKOUT signal
to begin oscillating, and it’s preferable for all LT3579s to
have the same internal free-running frequency. Therefore,
in general, use the same value RT resistor for all of the
synchronized LT3579s.
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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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