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參數(shù)資料
| 型號： | LT1681CN |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDIP20 |
| 封裝： | 0.300 INCH, PLASTIC, DIP-20 |
| 文件頁數(shù)： | 1/16頁 |
| 文件大小： | 225K |
| 代理商： | LT1681CN |
1
LT1681
Dual Transistor
Synchronous Forward Controller
October 2000
The LT
1681 controller simplifies the design of high power
synchronous dual transistor forward DC/DC converters. The
part employs fixed frequency current mode control and
supports both isolated and nonisolated topologies. The IC
drivesexternalN-channelpowerMOSFETsandoperateswith
input voltages up to 72V.
The LT1681’s operating frequency is programmable and can
be synchronized up to 250kHz. Switch phase is also con-
trolled during synchronized operation to accommodate mul-
tiple converter systems. Internal logic guarantees 50% maxi-
mum duty cycle operation to prevent transformer saturation.
The LT1681 incorporates a soft-start feature that provides a
controlled increase in supplied current during start-up and
after an undervoltage lockout or overvoltage/overcurrent
event.
The part is available in a 20-lead PDIP and plastic SO package.
s
Isolated Telecommunication Systems
s
Personal Computers and Peripherals
s
Distributed Power Step-Down Converters
s
Lead Acid Battery Backup Systems
s
Automotive and Heavy Equipment
s
High Voltage: Operation Up to 72V Max
s
Synchronous Switch Output
s
Synchronizable Operating Frequency and Output
Switch Phase for Multiple Controller Systems
s
Fixed Frequency Operation to 250kHz
s
Local 1.5% Voltage Reference
s
Undervoltage Lockout Protection with Hysteresis
s
Input Overvoltage Protection
s
Adaptive and Adjustable Blanking
s
Programmable Start Inhibit for Power Supply
Sequencing and Protection
s
Transformer Primary Saturation Protection
s
Optocoupler Support
s
Soft-Start Control
, LTC and LT are registered trademarks of Linear Technology Corporation.
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
DESCRIPTIO
U
FEATURES
APPLICATIO S
U
TYPICAL APPLICATIO
U
42V to 3.3V/5A DC/DC Synchronous Forward Converter
+
SHDN
OVLO
THERM
SGND
5VREF
FSET
SYNC
SS
VFB
VC
VBST
TG
BSTREF
BLKSENS
BG
PWRGND
VCC
SG
IMAX
SENSE
LT1681
C1
0.01
F
C6
3.3
F
C9
1
F
C10
150pF
R7
4.99k 1%
R8
8.25k 1%
R5
51k
R1
100k
VCC
9V TO 15V
C7
0.1
F
+
C12
10
F
C8
0.1
F
VIN
42V
+
C13
25
F
D3
D1N4148
D4
MUR120
TX1
COILTRONICS
VP5-1200
3:1
C5
0.1
F
M3
IRFZ24
M4
IRFZ24
D1
D1N5817
M2
VN2222L
D5
MUR120
R3
500
R6
10
C11
2.2nF
M5
IRFZ34S
L1
24
H
VOUT
3.3V
5A
C2
0.1
F
M1
Si4410DY
C3
1
F
D2
D1N5817
+
C4
1000
F
×3
1681 TA01
R2
0.075
R4
100
Electrical Specifications Subject to Change
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1681ESW | 功能描述:IC SYNCHRONOUS FWRD CTRLR 20SOIC 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) |
| LT1681ESW#PBF | 功能描述:IC SYNCHRONOUS FWRD CTRLR 20SOIC 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) |
| LT1681ESW#TR | 功能描述:IC SYNCHRONOUS FWRD CTRLR 20SOIC 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) |
| LT1681ESW#TRPBF | 功能描述:IC SYNCHRONOUS FWRD CTRLR 20SOIC 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) |
| LT1681ISW | 功能描述:IC SYNCHRONOUS FWRD CTRLR 20SOIC 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) |
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