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PDF LT8310 Data sheet ( Hoja de datos )
| Número de pieza | LT8310 | |
| Descripción | Forward Converter Controller | |
| Fabricantes | Linear | |
| Logotipo |  |
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Features
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
Applications
n Industrial, Automotive and Military Systems
n 48V Telecommunication Isolated Power Supplies
n Isolated and Nonisolated DC/DC Converters
LT8310
100VIN Forward Converter
Controller
Description
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.
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
78 Watt Isolated Forward Converter, ±8% VOUT
VIN
36V TO 72V
– VIN
2.2µF
100V
×4 86.6k
1.74k
1.43k
UVLO VIN
OVLO
LT8310
GATE
4.7µF
10nF
49.9k
200kHz
102k
NC
INTVCC
RDVIN
DFILT
SYNC
RT SS
0.47µF
SENSE
GND
SOUT
VC FBX
NC
2:1
1µF
100V
•
•
150pF
NPO
0.025Ω
1%
NC 8310 TA01a
47µH
22µF
×8
VOUT
12V
+ 0.6A TO 6.5A
100µF
–VOUT
For more information www.linear.com/LT8310
Output Voltage Load Regulation
14.0
13.5
13.0
12.5
12.0
11.5
11.0
VIN = 72V
10.5 VIN = 48V
VIN = 36V
10.0
01 2 3 4 5 6 7
IOUT (A)
8310 TA01b
8310f
1
1 page  
LT8310
E lectrical Characteristics The l denotes the specifications which apply over the full operating
temperature range,
otherwise noted.
otherwise
specifications
are
at
TA
=
25°C,
VIN
=
24V,
UVLO
=
24V,
OVLO
=
0V,
SYNC
=
0V,
SENSE
=
0V,
unless
PARAMETER
SOUT-to-GATE Delay (tPRE)
GATE-to-SOUT Delay (tPOST)
Soft-Start
SS Active Switching Level (GATE Switches)
SS Frequency Foldback Complete
SS Pin Current (Note 8)
SS Reset Threshold Voltage
CONDITIONS
SOUT Falling to GATE Rising (Note 8)
GATE Falling to SOUT Rising (Note 8)
fOSC within Specified Limits
Soft-Up
Slow Wake
Hard-Down, VSS = 0.4V
MIN TYP MAX UNITS
l 190 240 300
ns
l0
12 25
ns
0.95 1.00 1.05
l 2.5
l –60 –50 –40
l –6 –5 –4
6
0.27
V
V
µA
µA
mA
V
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: All voltages are relative to GND unless otherwise noted. All pin
currents are defined positive into the pin unless otherwise noted.
Note 3: Do not apply a positive or negative voltage or current source to the
GATE or SOUT pins, otherwise permanent damage may occur.
Note 4: The LT8310E is guaranteed to meet performance specifications
from the 0°C to 125°C junction temperature. Specifications over the –40°C
to 125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LT8310I is guaranteed over the full −40°C to 125°C operating junction
temperature range. The LT8310H is guaranteed over the full –40°C to
150°C operating junction temperature range. The LT8310MP is guaranteed
over the full –55°C to 150°C operating junction temperature range.
Operating lifetime is derated at junction temperatures greater than 125°C.
Note 5: The LT8310 includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed the maximum operating junction temperature
when overtemperature protection is active. Continuous operation above
the specified maximum junction temperature may impair device reliability.
Note 6: VSET = VINTVCC – VRDVIN.
Note 7: Line regulation in duty mode control applications is constrained
by the accuracy of the RDVIN pin input current, the duty mode control
gain, and the external set resistor, RSET. RSET should be specifiied to 1%
or better.
Note 8: See the Timing Diagrams section.
For more information www.linear.com/LT8310
8310f
5
5 Page 
Block Diagram
LT8310
For more information www.linear.com/LT8310
8310f
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LT8310.PDF ] | |
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