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LT8310IFE#TRPBF

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LT8310
1
8310f
For more information www.linear.com/LT8310
Typical applicaTion
FeaTures DescripTion
100V
IN
Forward Converter
Controller
The LT
®
8310 is a simple-to-use resonant reset forward
converter controller that drives the gate of a low side
N-channel MOSFET
from an internally regulated 10V sup-
ply. The LT8310 features duty mode control that generates
a
stable, regulated, isolated output using a single power
transformer. With the addition of output voltage feedback,
via opto-coupler (isolated) or directly wired (nonisolated),
current mode regulation is activated, improving output
accuracy and load response. The flexibility to choose
transformer turns ratio makes high step-down or step-up
ratios possible without operating at duty cycle extremes.
The user can program the switching frequency from 100kHz
to 500kHz to optimize efficiency, performance or external
component size. A synchronous output is available for
controlling secondary side synchronous rectification to
improve efficiency. User programmable protection features
include monitors on input voltage (UVLO and OVLO) and
switch current (overcurrent limit). The LT8310 soft-start
feature helps protect the transformer from flux saturation.
78 Watt Isolated Forward Converter, ±8% V
OUT
Output Voltage Load Regulation
applicaTions
n
Input Voltage Range: 6V to 100V
n
Duty Mode Control Regulates an Isolated Output
without an Opto
n
High Efficiency Synchronous Control
n
Short-Circuit (Hiccup Mode) Overcurrent Protection
n
Programmable OVLO and UVLO with Hysteresis
n
Programmable Frequency (100kHz to 500kHz)
n
Synchronizable to an External Clock
n
Positive or Negative Polarity Output Voltage Feedback
with a Single FBX Pin
n
Programmable Soft-Start
n
Low Shutdown Current < 1µA
n
Available in FE20 TSSOP with HV Pin Spacing
n
Industrial, Automotive and Military Systems
n
48V Telecommunication Isolated Power Supplies
n
Isolated and Nonisolated DC/DC Converters
L, LT, LTC , LT M, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
LT8310
UVLO
OVLO
DFILT
RT SS
SYNC
INTV
CC
RDVIN
GATE
SENSE
GND
V
C
NCNC
FBX
SOUT
4.7µF
V
IN
36V TO 72V
V
OUT
12V
0.6A TO 6.5A
–V
OUT
–V
IN
V
IN
86.6k
1.74k
1.43k
0.025Ω
1%
102k
49.9k
200kHz
2.2µF
100V
×4
47µH
2:1
150pF
NPO
••
8310 TA01a
10nF
1µF
100V
0.47µF
NC
22µF
×8
100µF
+
I
OUT
(A)
0
V
OUT
(V)
13.5
3
8310 TA01b
12.0
11.0
1 2 4
10.5
10.0
14.0
13.0
12.5
11.5
5 6 7
V
IN
= 72V
V
IN
= 48V
V
IN
= 36V
LT8310
2
8310f
For more information www.linear.com/LT8310
pin conFiguraTionabsoluTe MaxiMuM raTings
V
IN
, UVLO ...............................................................100V
INTV
CC
, RDVIN, SYNC ..............................................20V
DFILT...........................................................................8V
V
C
, OVLO, SS, RT ........................................................ 3V
FBX ................................................................. –3V to 3V
SENSE ....................................................... –0.3V to 0.3V
GATE, SOUT ..........................................................Note 3
Operating Junction Temperature Range (Notes 4, 5)
LT8310E ............................................. –40°C to 125°C
LT8310I .............................................. –40°C to 125°C
LT8310H ............................................ –40°C to 150°C
LT8310MP ......................................... –55°C to 150°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature Range (Soldering, 10 sec) ........300°C
(Notes 1, 2)
FE PACKAGE
20-LEAD PLASTIC TSSOP
1
3
5
6
7
8
9
10
TOP VIEW
20
18
16
15
14
13
12
11
UVLO
OVLO
DFILT
RT
SYNC
SS
V
C
FBX
NC
V
IN
RDVIN
INTV
CC
GATE
SENSE
NC
SOUT
21
GND
T
JMAX
= 125°C (E-, I-GRADES), T
JMAX
= 150°C (H-GRADE),
θ
JC
= 10°C/W, θ
JA
= 38°C/W
EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO THE GROUND PLANE
orDer inForMaTion
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT8310EFE#PBF LT8310EFE#TRPBF LT8310FE 20-Lead Plastic TSSOP –40°C to 125°C
LT8310IFE#PBF LT8310IFE#TRPBF LT8310FE 20-Lead Plastic TSSOP –40°C to 125°C
LT8310HFE#PBF LT8310HFE#TRPBF LT8310FE 20-Lead Plastic TSSOP –40°C to 150°C
LT8310MPFE#PBF LT8310MPFE#TRPBF LT8310FE 20-Lead Plastic TSSOP –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.
Consult LTC
Marketing for information on nonstandard lead based finish parts.
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/
LT8310
3
8310f
For more information www.linear.com/LT8310
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C, V
IN
= 24V, UVLO = 24V, OVLO = 0V, SYNC = 0V, SENSE = 0V, unless
otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Supply
Operating Input Voltage
l
6 100 V
V
IN
Supply Current in Shutdown UVLO = 0V
UVLO = 1.15V
0.3
5
1
7
µA
µA
V
IN
Operating Current Not Switching 3.8 4.6 mA
UVLO
UVLO Threshold Voltage UVLO Falling
l
1.196 1.220 1.250 V
UVLO Threshold Hysteresis UVLO Rising 40 mV
UVLO Low Quiescent Current Threshold I
VIN
< 1µA
l
0.36 0.62 0.85 V
UVLO Pin Input Current UVLO = 1.15V
UVLO = 1.30V
4.5 5.7
20
6.8
150
µA
nA
OVLO
OVLO Threshold Voltage OVLO Rising
l
1.225 1.250 1.275 V
OVLO Threshold Hysteresis OVLO Falling –33 mV
OVLO Pin Input Current OVLO = 1.17V
OVLO = 1.32V
10
120
150
400
nA
nA
Linear Regulator
INTV
CC
Regulation Voltage I
INTVCC
= 0mA to 20mA
l
9.6 10.0 10.3 V
Regulator Dropout Voltage (V
IN
– INTV
CC
) V
IN
= 9V, I
INTVCC
= 20mA 600 mV
INTV
CC
Undervoltage Lockout Threshold INTV
CC
Falling 4.60 4.75 4.90 V
INTV
CC
Undervoltage Hysteresis 0.45 V
INTV
CC
Overvoltage Lockout Threshold INTV
CC
Rising 17.0 17.4 17.8 V
INTV
CC
Overvoltage Hysteresis –0.65 V
INTV
CC
Current Limit V
IN
= 12V
l
25 33 39 mA
INTV
CC
Current in Shutdown UVLO = 0V, INTV
CC
= 10V 125 µA
INTV
CC
Line Regulation 10.8V ≤ V
IN
≤ 100V 0.001 0.01 %/V
INTV
CC
Load Regulation 0mA ≤ I
INTVCC
≤ 20mA –3.0 –0.4 %
Duty Cycle Control
Minimum GATE On-Time 190 ns
Maximum Duty Cycle V
IN
= 12V
l
75 78 82 %
RDVIN Pin Input Current
l
19.7 20.0 20.3 µA
Duty Control Transconductance (Note 6)
(ΔI
DFILT
/ΔV
SET
)
V
SET
= 1V 22.5 25.0 27.5 µA/V
Duty Mode Control Gain (Notes 6, 7),
Gain = V
IN
/V
SET
at I
DFILT
= 0µA
V
SET
= 0.5V to 6V
l
11.76 12.00 12.24 V/V
Duty Cycle Foldback,
Foldback = Duty at V
SS
= 1.15V/Duty (Nom)
SS = 1.15V 0.14 %/%
Error Amplifier
FBX Error Amp Reference Voltage FBX > 0V
FBX < 0V
l
l
1.568
–0.820
1.600
–0.800
1.632
–0.780
V
V
FBX Over
voltage Threshold FBX > 0V
FBX < 0V
6
5.5
7.5
7.5
9
10
%
%
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LT8310IFE#TRPBF

Mfr. #:
Buy LT8310IFE#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 100Vin For Conv Cntr
Lifecycle:
New from this manufacturer.
Delivery:
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