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參數(shù)資料
| 型號： | LTC1696 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Synchronous Dual Mode Phase Modulated Full Bridge Controllers |
| 中文描述： | 同步相位調(diào)制的雙模式全橋控制器 |
| 文件頁數(shù)： | 24/28頁 |
| 文件大?。?/td> | 319K |
| 代理商： | LTC1696 |
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LTC3722-1/LTC3722-2
24
372212i
OPERATIOU
Synchronous Rectification
The LTC3722-1/LTC3722-2 produces the precise timing
signals necessary to control current doubler secondary
side synchronous MOSFETs on OUTE and OUTF. Syn-
chronous rectifiers are used in place of Schottky or Silicon
diodes on the secondary side of the power supply. As
MOSFET R
DS(ON)
levels continue to drop, significant effi-
ciency improvements can be realized with synchronous
rectification, provided that the MOSFET switch timing is
optimized. An additional benefit realized with synchro-
nous rectifiers is bipolar output current capability. These
characteristics improve transient response, particularly
overshoot, and improve ZVS ability at light loads.
Programming the Synchronous Rectifier Turn-Off
Delay
The LTC3722-1/LTC3722-2 controllers include a feature
to program the turn-off edge of the secondary side syn-
chronous rectifier MOSFETs relative to the beginning of a
–
+
TURN-OFF
SYNC OUT
3722 F0Y
+
–
V
2V
SPRG
R
SPRG
Figure 14. Synchronous Delay Circuitry
new primary side power delivery pulse. This feature pro-
vides optimized timing for the synchronous MOSFETs
which improves efficiency. At higher load currents it
becomes more advantageous to delay the turn-off of the
synchronous rectifiers until the transformer core has been
reset to begin the new power pulse. This allows for
secondary freewheeling current to flow through the syn-
chronous MOSFET channel instead of its body diode.
The turn-off delay is programmed with a resistor from
SPRG to GND, see Figure 14. The nominal regulated
voltage on SPRG is 2V. The external resistor programs a
current which flows out of SPRG. The delay can be
adjusted from approximately 20ns to 200ns, with resistor
values of 10k to 200k. Do not leave SPRG floating. The
amount of delay can also be modulated based on an
external current source that sinks current out of SPRG.
Care must be taken to limit the current out of SPRG to
350
μ
A or less.
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| LTC3722-2 | Synchronous Dual Mode Phase Modulated Full Bridge Controllers |
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| LTC3727EG-1 | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LTC3727EG | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LTC3727-1 | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1696ES6#PBF | 制造商:Linear Technology 功能描述:IC OVERVOLTAGE PROTECTION CTRL SOT23-6 制造商:Linear Technology 功能描述:MONITOR OV 27VIN +/-2% ADJ 6SOT23 制造商:Linear Technology 功能描述:MONITOR, OV, 27VIN, +/-2%, ADJ, 6SOT23 制造商:Linear Technology 功能描述:IC, OVERVOLTAGE PROTECTION CTRL, SOT23-6; Input Voltage:17V; Output Voltage:6.3V; Supply Voltage Min:2.7V; Supply Voltage Max:27V; No. of Pins:6; No. of Outputs:1; Operating Temperature Min:-40C; Operating Temperature Max:85C ;RoHS Compliant: Yes |
| LTC1696ES6#TR | 功能描述:IC OVERVOLT PROT CTRLR SOT23-6 RoHS:否 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 應(yīng)用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR) |
| LTC1696ES6#TRM | 功能描述:IC OVERVOLT PROT CTRLR SOT23-6 RoHS:否 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 應(yīng)用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR) |
| LTC1696ES6#TRMPBF | 功能描述:IC OVERVOLT PROT CTRLR SOT23-6 RoHS:是 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 應(yīng)用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR) |
| LTC1696ES6#TRMPBF | 制造商:Linear Technology 功能描述:Controller IC 制造商:Linear Technology 功能描述:IC, OVERVOLTAGE PROTECTION CTRL, SOT23-6 |
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