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LT8311HFE#PBF

IC mosfet driver sync 20-tssop

器件类别：半导体    电源管理   

厂商名称：Linear ( ADI )

厂商官网：http://www.analog.com/cn/index.html

器件标准：  

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器件参数
参数名称
属性值
Datasheets
LT8311
Standard Package
74
Category
Integrated Circuits (ICs)
Family
PMIC - Power Supply Controllers, Monitors
系列
Packaging
Tube
Applications
Secondary-Side Controlle
Voltage - Supply
3.7 V ~ 30 V
Current - Supply
4.5mA
Operating Temperature
-40°C ~ 150°C
Mounting Type
Surface Mou
封装 / 箱体
Package / Case
20-TSSOP (0.173", 4.40mm Width) Exposed Pad
Supplier Device Package
20-TSSOP
Dynamic Catalog
Power Supply Controllers, Monitors
文档预览
FEATURES
n
n
LT8311
Synchronous Rectifier
Controller with Opto-Coupler
Driver for Forward Converters
DESCRIPTION
The
LT
®
8311
is used on the secondary side of a forward
converter to provide synchronous MOSFET control and
output voltage feedback through an opto-coupler. The
LT8311’s unique preactive mode allows control of the
secondary-side MOSFETs without requiring a traditional
pulse transformer for primary- to secondary-side com-
munication. In preactive mode, the output inductor current
operates in discontinuous conduction mode (DCM) at
light load. If forced continuous mode (FCM) operation is
desired at light load, the LT8311 can, alternatively, be used
in SYNC mode, where a pulse transformer is required to
send synchronous control signals from the primary-side
IC to the LT8311.
The LT8311 offers a full featured opto-coupler controller,
incorporating a 1.5% reference, a transconductance error
amplifier and a 10mA opto-driver. Power good monitoring
and output soft-start/overshoot control are also included.
The LT8311 is available in a 16-lead FE package with pins
removed for high voltage spacing requirements.
n
n
n
n
n
Wide Input Supply Range: 3.7V to 30V
Preactive Mode:
n
No Pulse Transformer Required
n
DCM Operation at Light Load
SYNC Mode:
n
FCM or DCM Operation at Light Load
n
Achieves Highest Efficiency
1.5% Feedback Voltage Reference
10mA Opto-Coupler Driver
Output Power Good Indicator
Integrated Soft-Start Function
APPLICATIONS
n
n
n
Offline and HV Car Battery Isolated Power Supplies
48V Isolated Power Supplies
Industrial, Automotive and Military Systems
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
V
IN
18V to
72V
4.7µF
×3
100k
UVLO_VSEC
5.9k
OVLO
1.82k
LT3753
AOUT
V
IN
18V to 72V, 12V/8A Active Clamp Isolated Forward Converter
4:4
6.8µH
•
2.2µF
100V
100nF
100nF
•
2k
2k
FSW
FG
CSW
CSP
CG
1.78k
CSN
V
IN
LT8311
FB
20k
2.2nF
100k
68pF
22µF
×2
+
V
OUT
12V
470µF
10k
11.3k
1.78k
71.5k
240kHz
31.6k
IVSEC
RT
SYNC
S
OUT
TAO
TAS
TOS
TBLNK
GND SS1
OUT
ISENSEP
OC
ISENSEN
INTV
CC
COMP
SS2 FB
2k
6m
V
OUT
100k
1.5k
PGOOD
4.7µF
2.2µF
49.9k
15nF
100k
100k
4.7µF 100
10pF
2.94k
1µF
OPTO
INTV
CC
COMP
SYNC
PMODE
SS
TIMER GND
124k
1µF
34k
0.47µF
1µF
8311 TA01
1k
2.2nF
8311f
For more information
www.linear.com/LT8311
1
LT8311
TABLE OF CONTENTS
Features ............................................................................................................................ 1
Applications ....................................................................................................................... 1
Typical Application ............................................................................................................... 1
Description......................................................................................................................... 1
Absolute Maximum Ratings ..................................................................................................... 3
Order Information ................................................................................................................. 3
Pin Configuration ................................................................................................................. 3
Electrical Characteristics ........................................................................................................ 4
Typical Performance Characteristics .......................................................................................... 7
Pin Functions .....................................................................................................................11
Block Diagram....................................................................................................................12
Operation..........................................................................................................................13
FUNDAMENTALS OF FORWARD CONVERTER OPERATION IN CCM ..................................................................... 13
LT8311 SYNCHRONOUS CONTROL SCHEMES..................................................................................................... 17
PREACTIVE MODE SYNCHRONOUS CONTROL .................................................................................................... 17
SYNC MODE SYNCHRONOUS CONTROL ............................................................................................................. 19
OPTO-COUPLER CONTROL .................................................................................................................................. 21
Applications Information .......................................................................................................25
V
IN
BIAS SUPPLY .................................................................................................................................................. 25
INTV
CC
BIAS SUPPLY............................................................................................................................................ 26
LT8311 OPTO CONTROL FUNDAMENTALS ........................................................................................................... 27
LT8311 SYNCHRONOUS CONTROL FUNDAMENTALS .......................................................................................... 31
PREACTIVE MODE SYNCHRONOUS CONTROL ................................................................................................... 37
SYNC MODE SYNCHRONOUS CONTROL ............................................................................................................ 38
Typical Applications .............................................................................................................40
Package Description ............................................................................................................47
Typical Application ..............................................................................................................48
Related Parts .....................................................................................................................48
8311f
2
For more information
www.linear.com/LT8311
LT8311
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
TOP VIEW
CSW
FSW
FG
INTV
CC
V
IN
PMODE
OPTO
1
3
5
6
7
8
9
20 CSP
18 CSN
16 CG
15 SYNC
14 SS
13
PGOOD
12 TIMER
11 FB
CSW, FSW, CSP ....................................... –0.3V to 150V
SYNC ........................................................... –12V to 12V
V
IN
,
PGOOD
................................................ –0.3V to 30V
INTV
CC
,
PMODE
......................................... –0.3V to 18V
FB, SS, COMP ........................................... –0.3V to 2.5V
TIMER ....................................................... –0.3V to 1.5V
CSN........................................................... –0.3V to 0.4V
OPTO, TIMER Short-Circuit
Current Duration .................................... Infinite (Note 5)
Operating Junction Temperature Range
LT8311E (Notes 2, 3) ......................... –40°C to 125°C
LT8311I (Notes 2, 3) .......................... –40°C to 125°C
LT8311H (Notes 2, 3) ......................... –40°C to 150°C
LT8311MP (Notes 2, 3) ...................... –55°C to 150°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10sec).................... 300°C
21
GND
COMP 10
FE PACKAGE
20-LEAD PLASTIC TSSOP
θ
JA
= 38°C/W,
θ
JC
= 10°C/W
EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LT8311EFE#PBF
LT8311IFE#PBF
LT8311HFE#PBF
LT8311MPFE#PBF
TAPE AND REEL
LT8311EFE#TRPBF
LT8311IFE#TRPBF
LT8311HFE#TRPBF
LT8311MPFE#TRPBF
PART MARKING*
LT8311FE
LT8311FE
LT8311FE
LT8311FE
PACKAGE DESCRIPTION
20-Lead Plastic TSSOP
20-Lead Plastic TSSOP
20-Lead Plastic TSSOP
20-Lead Plastic TSSOP
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 150°C
–55°C to 150°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
8311f
For more information
www.linear.com/LT8311
3
LT8311
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C, V
IN
= 12V, V
INTVCC
= 8V,
PMODE
= 5V, C
CG
= C
FG
= 100pF, unless
otherwise noted. (Note 2)
PARAMETER
Supply
V
IN
Operating Range
V
IN
UVLO
Quiescent Current
Error Amplifier
Feedback Reference Voltage
Feedback Voltage Line Regulation
Feedback Voltage Load Regulation
Feedback Pin Bias Current
Error Amplifier Transconductance
Error Amplifier Voltage Gain
Error Amplifier Output Swing High
Error Amplifier Output Swing Low
Power Good
Power NOT Good (Outside This Window) % Relative to FB Ref Voltage
Power Good (Inside This Window)
Power Good Indicator Wait Time
Power Good Leakage
Power Good Output Low Voltage
Soft-Start (SS)
SS Wake-Up Slew Current
SS Wake-Up Offset Voltage
SS Charge Current
SS Pull-Down Amplifier Offset Voltage
Current Exists Upon Part Wake Up, Shuts Off After SS Wake Up
Offset Voltage Is Satisfied (Note 6)
V
FB
– V
SS
, Upon Part Wake Up SS Is Slewed Up to an Offset
Voltage Below FB by SS Wake-Up Slew Current
SS = 0V, FB = 0.6V (Note 9)
V
SS
– V
FB
, Pull-Down Amplifier Prevents SS from Rising Beyond
This Offset Voltage Above FB When the FB Pin Voltage Is Below
50% of the FB Reference Voltage
SS = 1.5V, FB = 0.6V (Note 7)
1.8
1.3V ≤ COMP (Note 5)
(Note 5)
(Note 5)
l
l
ELECTRICAL CHARACTERISTICS
CONDITIONS
MIN
3.7
50
TYP
MAX
30
UNITS
V
V
mV
mA
V
%
%
nA
µmhos
dB
V
IN
Rising
Hysteresis
Not Switching
V
IN
= 12V
3.7V ≤ V
IN
≤ 30V, % of FB Ref Voltage
1.3V ≤ COMP ≤ 1.8V, % of FB Ref Voltage
Current Out of FB pin
1.3V ≤ COMP ≤ 1.8V
1.3V ≤ COMP ≤ 1.8V
FB = 1V
FB = 1.5V
l
3.6
100
4.5
3.7
150
5.5
1.245
0.1
0.1
200
l
1.209
1.227
0.015
0.05
120
370
65
1.9
0.75
±4
2.3
1
±10
±7
175
2.8
1.25
±16
V
V
%
%
µs
% Relative to FB Ref Voltage
Minimum Time That FB Must Stay within Power Good Window
Before
PGOOD
Pin Goes Low
PGOOD
= 30V
Current into
PGOOD
Pin = 1mA
l
±1
0.2
1
16
9
10
100
11
0.3
µA
V
mA
mV
µA
mV
SS Pull-Down Amplifier Maximum
Sink Current
SS High Clamp Voltage
Opto Driver
COMP Buffer Input Offset Voltage
Opto-Driver Reference Voltage
Opto-Driver DC Gain
13
2
0.9
1
–7
mA
V
V
V
V/ V
8311f
4
For more information
www.linear.com/LT8311
LT8311
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C, V
IN
= 12V, V
INTVCC
= 8V,
PMODE
= 5V, C
CG
= C
FG
= 100pF, unless
otherwise noted. (Note 2)
PARAMETER
Inverting DC Gain From COMP Pin to
OPTO Pin
Opto-Driver –3dB Bandwidth
Opto-Driver Output Swing Low
Opto-Driver Output Swing High
CONDITIONS
(∆V
OPTO
/∆V
COMP
), 1.290V ≤ COMP ≤ 1.310V
(∆V
OPTO
/∆V
COMP
), 1.490V ≤ COMP ≤ 1.510V
(∆V
OPTO
/∆V
COMP
), 1.890V ≤ COMP ≤ 1.910V
No Load (Note 5)
FB = 1V, COMP = SS = OPTO = Open
V
IN
= 3.7V, FB = 1.5V, COMP = SS = Open, I
OPTO
= 10mA
V
IN
= 30V, FB = 1.5V, COMP = SS = Open, I
OPTO
= 10mA
Opto-Driver Output Short-Circuit Current V
IN
= 30V, FB = 1.5V, COMP = SS = Open, OPTO = 0V (Note 6)
Opto-Driver Output Sink Current
Internal Linear Regulator
INTV
CC
Regulation Voltage
INTV
CC
Load Regulation
INTV
CC
UVLO Rising
INTV
CC
UVLO Falling
INTV
CC
OVLO Rising
INTV
CC
OVLO Falling
INTV
CC
Current Limit
INTV
CC
Dropout Voltage
CG and FG Gate Drivers
Driver Output Rise Time
Driver Output Fall Time
Driver Output High Voltage
Driver Output Low Voltage
PMODE
Selection
PMODE
Trip Voltage
PMODE
Input Current
Preactive Mode (Tie
PMODE
to 0V)
Preactive Mode Operating
Frequency Range
CSW High Trip Voltage
CSW High Input Current
CSW Low Trip Voltage
FSW Trip Voltage
FSW High Input Current
CG Falling Edge to CSW Rising Edge
Prediction Delay
FSW = 150V (Note 7)
CSW = 150kHz (Note 10), FSW = 0V, CSP = –500mV
CSW Ramp Up
CSW = 150V (Note 7)
CSW Ramp Down
l
l
l
l
l
l
l
l
l
l
l
l
l
ELECTRICAL CHARACTERISTICS
MIN
TYP
–5
–5.9
–6.2
400
0.5
MAX
UNITS
V/ V
V/ V
V/ V
kHz
0.85
V
V
V
V
IN
– 1.7 V
IN
– 1.4
5.2
10.5
200
6.5
6.5
15
300
7
1.8
4.6
4.1
14
38
4.3
16.5
15
48
20
400
25
25
58
17.5
18
420
7.5
3
4.8
mA
µA
V
mV/mA
V
V
V
V
mA
mA
mV
ns
ns
V
FB = 1V, OPTO = 1.2V (Note 7)
No Load
(∆V
INTVCC
/∆I
INTVCC
), 0A ≤ I
INTVCC
≤ 20mA
l
l
l
l
l
INTV
CC
> I
INTVCC_UVLO_RISING
(= 4.6V)
INTV
CC
< I
INTVCC_UVLO_FALLING
(= 4.3V)
V
IN
= 6V, I
INTVCC
= 10mA, Not Switching
C
CG
= C
FG
= 3.3nF, INTV
CC
= 8V (Note 4)
C
CG
= C
FG
= 3.3nF, INTV
CC
= 8V (Note 4)
l
l
l
V
INTVCC
– 0.2
0.7
1
1.2
30
60
100
1
–250
1
5
10
1.2
250
–150
1.2
250
100
50
1.4
90
300
1.4
500
–50
1.4
500
300
80
V
V
mV
µA
kHz
V
µA
mV
V
µA
ns
ns
PMODE
Ramp Up
Hysteresis
PMODE
= 18V
l
l
CG Falling Edge Delay to FG Rising Edge CSW = 150kHz (Note 10), FSW = 0V, CSP = –500mV
8311f
For more information
www.linear.com/LT8311
5
查看更多>
参数对比
与LT8311HFE#PBF相近的元器件有：LT8311MPFE#TRPBF、LT8311EFE#TRPBF、LT8311HFE#TRPBF、LT8311IFE#TRPBF、LT8311MPFE#PBF、LT8311IFE#PBF、LT8311EFE#PBF。描述及对比如下：
型号 LT8311HFE#PBF LT8311MPFE#TRPBF LT8311EFE#TRPBF LT8311HFE#TRPBF LT8311IFE#TRPBF LT8311MPFE#PBF LT8311IFE#PBF LT8311EFE#PBF
描述 IC mosfet driver sync 20-tssop IC MOSFET DRIVER SYNC 20-TSSOP IC MOSFET DRIVER SYNC 20-TSSOP IC MOSFET DRIVER SYNC 20-TSSOP IC MOSFET DRIVER SYNC 20-TSSOP IC MOSFET DRIVER SYNC 20-TSSOP IC MOSFET DRIVER SYNC 20-TSSOP 具有用于正激式转换器之光耦合器驱动器的同步整流器控制器
应用 - 次级侧控制器 次级侧控制器 次级侧控制器 次级侧控制器 次级侧控制器 次级侧控制器 -
电压 - 电源 - 3.7 V ~ 30 V 3.7 V ~ 30 V 3.7 V ~ 30 V 3.7 V ~ 30 V 3.7 V ~ 30 V 3.7 V ~ 30 V -
电流 - 电源 - 4.5mA 4.5mA 4.5mA 4.5mA 4.5mA 4.5mA -
工作温度 - -55°C ~ 150°C -40°C ~ 150°C -40°C ~ 150°C -40°C ~ 150°C -55°C ~ 150°C -40°C ~ 150°C -
安装类型 - 表面贴装 表面贴装 表面贴装 表面贴装 表面贴装 表面贴装 -
封装/外壳 - 20-TSSOP（0.173"，4.40mm 宽），16 引线，裸露焊盘 20-TSSOP（0.173"，4.40mm 宽），16 引线，裸露焊盘 20-TSSOP（0.173"，4.40mm 宽），16 引线，裸露焊盘 20-TSSOP（0.173"，4.40mm 宽），16 引线，裸露焊盘 20-TSSOP（0.173"，4.40mm 宽），16 引线，裸露焊盘 20-TSSOP（0.173"，4.40mm 宽），16 引线，裸露焊盘 -
供应商器件封装 - 20-TSSOP-EP 20-TSSOP-EP 20-TSSOP-EP 20-TSSOP-EP 20-TSSOP-EP 20-TSSOP-EP -
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器件捷径:
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