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PDF LT8300 Data sheet ( Hoja de datos )
| Número de pieza | LT8300 | |
| Descripción | 100VIN Micropower Isolated Flyback Converter | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Features
n 6V to 100V Input Voltage Range
n 260mA, 150V Internal DMOS Power Switch
n Low Quiescent Current:
70µA in Sleep Mode
330µA in Active Mode
n Boundary Mode Operation at Heavy Load
n Low-Ripple Burst Mode® Operation at Light Load
n Minimum Load <0.5% (Typ) of Full Output
n VOUT Set with a Single External Resistor
n No Transformer Third Winding or Opto-Isolator
Required for Regulation
n Accurate EN/UVLO Threshold and Hysteresis
n Internal Compensation and Soft-Start
n 5-Lead TSOT-23 Package
Applications
n Isolated Telecom, Automotive, Industrial, Medical
Power Supplies
n Isolated Auxiliary/Housekeeping Power Supplies
LT8300
100VIN Micropower Isolated
Flyback Converter with
150V/260mA Switch
Description
The LT®8300 is a micropower high voltage isolated flyback
converter. By sampling the isolated output voltage directly
from the primary-side flyback waveform, the part requires
no third winding or opto-isolator for regulation. The output
voltage is programmed with a single external resistor. In-
ternal compensation and soft-start further reduce external
component count. Boundary mode operation provides a
small magnetic solution with excellent load regulation.
Low ripple Burst Mode operation maintains high efficiency
at light load while minimizing the output voltage ripple.
A 260mA, 150V DMOS power switch is integrated along
with all high voltage circuitry and control logic into a 5-lead
ThinSOT™ package.
The LT8300 operates from an input voltages range of 6V
to 100V and can deliver up to 2W of isolated output power.
The high level of integration and the use of boundary
and low ripple burst modes result in a simple to use, low
componenthttp://www.DataSheet4U.com/ count, and high efficiency application solution
for isolated power delivery.
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners. Protected by U.S. Patents, including 5438499, 7463497,
and 7471522.
Typical Application
5V Micropower Isolated Flyback Converter
VIN
36V TO 72V
2.2µF
1M
VIN
LT8300
EN/UVLO
4:1
•
300µH
19µH
•
SW
40.2k
GND
RFB
8300 TA01a
210k
VOUT+
5V
1mA TO 300mA
47µF
VOUT–
100
90
80
70
60
50
40
30
20
10
0
0
Efficiency vs Load Current
VIN = 36V
VIN = 72V VIN = 48V
50 100 150 200 250 300
LOAD CURRENT (mA)
8300 TA01b
8300f
1
1 page  
LT8300
Typical Performance Characteristics TA = 25°C, unless otherwise noted.
EN/UVLO Enable Threshold
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)
8300 G10
EN/UVLO Hysteresis Current
5
4
3
2
1
0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
8300 G11
RFB Regulation Current
105
104
103
102
101
100
99
98
97
96
95
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
8300 G12
RDS(ON)
25
20
15
10
5
0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
8300 G13
Switch Current Limit
300
MAXIMUM CURRENT LIMIT
250
200
150
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100
50 MINIMUM CURRENT LIMIT
0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
8300 G14
Maximum Switching Frequency
1000
800
600
400
200
0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
8300 G15
Minimum Switching Frequency
20
16
12
8
4
0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
8300 G16
Minimum Switch-On Time
400
300
200
100
0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
8300 G17
Minimum Switch-Off Time
400
300
200
100
0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
8300 G18
8300f
5
5 Page 
Applications Information
3.5
MAXIMUM
3.0
OUTPUT
POWER
N = 12:1
2.5
N = 8:1
2.0 N = 6:1
1.5 N = 4:1
1.0
0.5
0
0 20 40 60 80 100
INPUT VOLTAGE (V)
8300 F01
Figure 1. Output Power for 3.3V Output
LT8300
3.5
MAXIMUM
3.0
OUTPUT
POWER
N = 8:1
2.5 N = 6:1
2.0 N = 4:1
1.5
N = 2:1
1.0
0.5
0
0 20 40 60 80 100
INPUT VOLTAGE (V)
8300 F02
Figure 2. Output Power for 5V Output
3.5
N = 4:1
3.0
MAXIMUM
2.5 OUTPUT
POWER
2.0
N = 3:1
N = 2:1
1.5 N = 1:1
1.0
0.5
0
0 20 40 60 80 100
INPUT VOLTAGE (V)
8300 F03
Figure 3. Output Power for 12V Output
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3.5
N = 2:1
3.0
2.5
MAXIMUM
OUTPUT
POWER
2.0
N = 3:2
N = 1:1
1.5
N = 1:2
1.0
0.5
0
0 20 40 60 80 100
INPUT VOLTAGE (V)
8300 F04
Figure 4. Output Power for 24V Output
Primary Inductance Requirement
The LT8300 obtains output voltage information from the
reflected output voltage on the SW pin. The conduction
of secondary current reflects the output voltage on the
primary SW pin. The sample-and-hold error amplifier needs
a minimum 350ns to settle and sample the reflected output
voltage. In order to ensure proper sampling, the second-
ary winding needs to conduct current for a minimum of
350ns. The following equation gives the minimum value
for primary-side magnetizing inductance:
( )
LPRI
≥
tOFF(MIN)
• NPS • VOUT
ISW(MIN)
+
VF
tOFF(MIN) = Minimum switch-off time = 350ns
ISW(MIN) = Minimum switch current limit = 52mA
In addition to the primary inductance requirement for
the minimum switch-off time, the LT8300 has minimum
switch-on time that prevents the chip from turning on
the power switch shorter than approximately 160ns. This
minimum switch-on time is mainly for leading-edge blank-
ing the initial switch turn-on current spike. If the inductor
current exceeds the desired current limit during that time,
oscillation may occur at the output as the current control
loop will lose its ability to regulate. Therefore, the following
equation relating to maximum input voltage must also be
followed in selecting primary-side magnetizing inductance:
LPRI
≥
tON(MIN) • VIN(MAX)
ISW(MIN)
tON(MIN) = Minimum Switch-On Time = 160ns
8300f
11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet LT8300.PDF ] | |
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