參數(shù)資料
型號(hào)： LT3751IFE#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO20
封裝： 4.40 MM, LEAD FREE, PLASTIC, TSSOP-20
文件頁(yè)數(shù)： 2/34頁(yè)
文件大?。?/td> 403K
代理商： LT3751IFE#TRPBF
LT3751
10
3751fb
OPERATION
The LT3751 can be used as either a fast, efcient high
voltage capacitor charger controller or as a high voltage,
low noise voltage regulator. The FB pin voltage determines
one of the three primary modes: charge mode, low noise
regulation, or no-load operation (see Figure 1).
Figure 1. FB Pin Modes
CHARGE MODE
When the FB pin voltage is below 1.16V, the LT3751 acts
as a rapid capacitor charger. The charging operation has
four basic states for charge mode steady-state operation
(see Figure 2).
1. Start-Up
The rst switching cycle is initiated approximately 2μs
after the CHARGE pin is raised high. During this phase,
the start-up one-shot enables the master latch turning
on the external NMOS and beginning the rst switching
cycle. After start-up, the master latch will remain in the
switching-enable state until the target output voltage is
reached or a fault condition occurs.
The LT3751 utilizes circuitry to protect against transformer
primary current entering a runaway condition and remains
in start-up mode until the DCM comparator has enough
headroom. Refer to the Start-Up Protection section for
more detail.
2. Primary-Side Charging
When the NMOS switch latch is set, and depending on the
use of LVGATE, the gate driver rapidly charges the gate
pin to VCC – 2V in high voltage applications or directly to
VCC in low voltage applications (refer to the Application
FB PIN
VOLTAGE
3751 F01
NO-LOAD
OPERATION
REGULATION
CHARGE
MODE
1.34V
1.16V
0.0V
Figure 2. Idealized Charging Waveforms
VTRANS – VDS(ON)
LPRI
VTRANS – VDS(ON)
–N (VTRANS – VDS(ON))
VOUT + VDIODE
LSEC
IPK
N
–(VOUT + VDIODE)
N
ILPRI
ILSEC
VPRI
VSEC
VDRAIN
VOUT + VDIODE
N
VTRANS +
VTRANS
VDS(ON)
3751 F02
VDS(ON)
1.
PRIMARY-SIDE
CHARGING
2.
SECONDARY
ENERGY TRANSFER
AND OUTPUT
DETECTION
3.
DISCONTINUOUS
MODE
DETECTION
Burst Mode is a registered trademark of Linear Technology Corporation.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LT3751IUFD 制造商:LINER 制造商全稱:Linear Technology 功能描述:Capacitor Charger Controller with Regulation
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LT3751IUFD-PBF 制造商:LINER 制造商全稱:Linear Technology 功能描述:Capacitor Charger Controller with Regulation
LT3751IUFD-TR 制造商:LINER 制造商全稱:Linear Technology 功能描述:Capacitor Charger Controller with Regulation
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