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What is LT8315?

This electronic component, produced by the manufacturer "Linear", performs the same function as "Micropower No-Opto Isolated Flyback Converter".


LT8315 Datasheet PDF - Linear

Part Number LT8315
Description Micropower No-Opto Isolated Flyback Converter
Manufacturers Linear 
Logo Linear Logo 


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LT8315
560VIN Micropower No-Opto
Isolated Flyback Converter
with 630V/300mA Switch
Features
Description
nn Wide Input Voltage Range: 18V to 560V
nn 630V/300mA Integrated Power Switch
nn No Opto-Isolator Required for Regulation
nn Quasi-Resonant Boundary Mode Operation
nn Constant-Current and Constant-Voltage Regulation
nn Low-Ripple Light Load Burst Mode® Operation
nn Low Quiescent Current: 70μA
nn Programmable Current Limit and Soft-Start
nn TSSOP Package with High-Voltage Spacing
Applications
nn Isolated Telecom, Automotive, Industrial, Medical
Power Supplies
nn Isolated Off-Line Housekeeping Power Supplies
nn Electric Vehicles and Battery Stacks
The LT®8315 is a high voltage flyback converter with inte-
grated 630V/300mA switch. No opto-isolator is needed for
regulation. The device samples the output voltage from the
isolated flyback waveform appearing across a third wind-
ing on the transformer. Quasi-resonant boundary mode
operation improves load regulation, reduces transformer
size, and maintains high efficiency.
At start-up, the LT8315 charges its INTVCC capacitor via a
current source attached to the DRAIN pin. During normal
operation, the current source turns off and the device
draws its power from a third winding on the transformer.
The LT8315 operates from a wide range of input supply
voltages and can deliver up to 15W of power. It is available
in a thermally enhanced 20-pin TSSOP package with four
pins removed for high-voltage spacing.
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
Typical Application
VIN
20V TO 450V
0.44µF
10µF
10µF
20VIN to 450VIN Isolated 12VOUT Supply
600Ω
20k
47pF
BIAS
EN/UVLO
DCM
FB
INTVCC
LT8315
TC
SMODE
DRAIN
61.9k
5:1:2
640µH
93.1k
VOUT+
12V
160µH
200µF
5.11k 4mH
VOUT–
5mA to 220mA (VIN = 50V)
5mA to 320mA (VIN = 100V)
5mA to 380mA (VIN = 150V)
5mA to 440mA (VIN > 250V)
470pF
VC SOURCE
100k IREG/SS GND
22nF
121k
330mΩ
8315 TA01a
Efficiency
90
80
70
60
50
VIN = 50V
VIN = 100V
VIN = 150V
40
VIN = 250V
VIN = 350V
VIN = 450V
30
0 100 200 300 400 500
LOAD CURRENT (mA)
8315 TA01b
For more information www.linear.com/LT8315
8315f
1

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LT8315 equivalent
LT8315
Typical Performance Characteristics TA = 25°C, unless otherwise noted.
DRAIN Shutdown Current
60
VDRAIN = 100V
VDRAIN = 630V
45
BIAS Quiescent Current
160
120
30 80
15 40
0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
8315 G10
0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
8315 G11
Depletion Startup Current
1.6
1.4
1.2
–55°C
25°C
150°C
1.0
0.8
0.6
0.4
0.2
0
0 3 6 9 12 15
VINTVCC (V)
8315 G12
EN/ULVO Threshold
1.35
EN/UVLO Rising
EN/UVLO Falling
1.30
1.25
1.20
1.15
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
8315 G13
FB Regulation Voltage
1.240
1.235
1.230
1.225
1.220
1.215
1.210
1.205
1.200
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
8315 G14
TC Pin Voltage
1.80
1.60
1.40
1.20
1.00
0.80
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
8315 G15
IREG/SS Pin Current
10.5
10.4
10.3
10.2
10.1
10.0
9.9
9.8
9.7
9.6
9.5
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
8315 G16
Switching Frequency Limit
150
145
140
135 MAXIMUM SWITCHING FREQUENCY
130
125
5
4
3 MINIMUM SWITCHING FREQUENCY
2
1
0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
8315 G17
For more information www.linear.com/LT8315
Switch Current Limit
110
105
100
95 MAXIMUM CURRENT LIMIT
90
85
25
20
15
10
5
0
–50
MINIMUM CURRENT LIMIT
–25 0 25 50 75 100
TEMPERATURE (°C)
125 150
8315 G18
8315f
5


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Part Details

On this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for LT8315 electronic component.


Information Total 24 Pages
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