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參數(shù)資料
| 型號： | LT3751IUFD#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC20 |
| 封裝： | 4 X 5 MM, LEAD FREE, PLASTIC, QFN-20 |
| 文件頁數(shù)： | 2/34頁 |
| 文件大?。?/td> | 403K |
| 代理商： | LT3751IUFD#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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相關代理商/技術參數(shù) |
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| LT3754 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:16-Channel 50mA LED |
| LT3754EUH#PBF | 功能描述:IC LED DRIVER AUTOMOTIVE 32QFN RoHS:是 類別:集成電路 (IC) >> PMIC - LED 驅(qū)動器 系列:- 標準包裝:6,000 系列:- 恒定電流:- 恒定電壓:- 拓撲:開路漏極，PWM 輸出數(shù):4 內(nèi)部驅(qū)動器:是 類型 - 主要:LED 閃爍器 類型 - 次要:- 頻率:400kHz 電源電壓:2.3 V ~ 5.5 V 輸出電壓:- 安裝類型:表面貼裝 封裝/外殼:8-VFDFN 裸露焊盤 供應商設備封裝:8-HVSON 包裝:帶卷 (TR) 工作溫度:-40°C ~ 85°C 其它名稱:935286881118PCA9553TK/02-TPCA9553TK/02-T-ND |
| LT3754EUH#TRPBF | 功能描述:IC LED DVR 16CH 50MA 32QFN RoHS:是 類別:集成電路 (IC) >> PMIC - LED 驅(qū)動器 系列:- 標準包裝:6,000 系列:- 恒定電流:- 恒定電壓:- 拓撲:開路漏極，PWM 輸出數(shù):4 內(nèi)部驅(qū)動器:是 類型 - 主要:LED 閃爍器 類型 - 次要:- 頻率:400kHz 電源電壓:2.3 V ~ 5.5 V 輸出電壓:- 安裝類型:表面貼裝 封裝/外殼:8-VFDFN 裸露焊盤 供應商設備封裝:8-HVSON 包裝:帶卷 (TR) 工作溫度:-40°C ~ 85°C 其它名稱:935286881118PCA9553TK/02-TPCA9553TK/02-T-ND |
| LT3754EUHPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:16-Channel × 50mA LED Driver |
| LT3754EUHTRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:16-Channel × 50mA LED Driver |
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