Datasheet LT8300 (Analog Devices)
| Fabricante | Analog Devices |
| Descripción | 100VIN Micropower Isolated Flyback Converter with 150V/260mA Switch |
| Páginas / Página | 24 / 1 — FEATURES. DESCRIPTION. 6V to 100V Input Voltage Range. 260mA, 150V … |
| Revisión | A |
| Formato / tamaño de archivo | PDF / 1.4 Mb |
| Idioma del documento | Inglés |
FEATURES. DESCRIPTION. 6V to 100V Input Voltage Range. 260mA, 150V Internal DMOS Power Switch. Low Quiescent Current
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LT8300 100VIN Micropower Isolated Flyback Converter with 150V/260mA Switch
FEATURES DESCRIPTION
n
6V to 100V Input Voltage Range
The LT®8300 is a micropower high voltage isolated fly- n
260mA, 150V Internal DMOS Power Switch
back converter. By sampling the isolated output voltage n
Low Quiescent Current
directly from the primary-side flyback waveform, the part n
70µA in Sleep Mode
requires no third winding or opto-isolator for regulation. n
330µA in Active Mode
The output voltage is programmed with a single exter- n
Boundary Mode Operation at Heavy Load
nal resistor. Internal compensation and soft-start further n
Low-Ripple Burst Mode® Operation at Light Load
reduce external component count. Boundary mode opera- n
Minimum Load <0.5% (Typ) of Full Output
tion provides a small magnetic solution with excellent load n
VOUT Set with a Single External Resistor
regulation. Low ripple Burst Mode operation maintains n No Transformer Third Winding or Opto-Isolator high efficiency at light load while minimizing the output Required for Regulation voltage ripple. A 260mA, 150V DMOS power switch is n Accurate EN/UVLO Threshold and Hysteresis integrated along with all high voltage circuitry and control n Internal Compensation and Soft-Start logic into a 5-lead ThinSOT™ package. n 5-Lead TSOT-23 Package The LT8300 operates from an input voltages range of 6V n AEC-Q100 Qualified for Automotive Applications 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
APPLICATIONS
component count, and high efficiency application solution n Isolated Telecom, Automotive, Industrial, Medical for isolated power delivery. Power Supplies All registered trademarks and trademarks are the property of their respective owners. Protected n Isolated Auxiliary/Housekeeping Power Supplies by U.S. Patents, including 5438499, 7463497, and 7471522.
TYPICAL APPLICATION 5V Micropower Isolated Flyback Converter Efficiency vs Load Current
100 + V VOUT IN 90 V 4:1 IN = 36V 36V TO 72V 5V 1mA TO 300mA • 80 2.2µF 300µH 19µH V 70 IN 1M • 47µF VIN = 48V V LT8300 60 IN = 72V EN/UVLO SW V – 50 OUT 40 40.2k 210k EFFICIENCY (%) 30 RFB 20 GND 10 8300 TA01a 0 0 50 100 150 200 250 300 LOAD CURRENT (mA) 8300 TA01b Rev. A Document Feedback For more information www.analog.com 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Operation Applications Information Typical Applications Package Description Typical Application Related Parts
FEATURES DESCRIPTION
n
6V to 100V Input Voltage Range
The LT®8300 is a micropower high voltage isolated fly- n
260mA, 150V Internal DMOS Power Switch
back converter. By sampling the isolated output voltage n
Low Quiescent Current
directly from the primary-side flyback waveform, the part n
70µA in Sleep Mode
requires no third winding or opto-isolator for regulation. n
330µA in Active Mode
The output voltage is programmed with a single exter- n
Boundary Mode Operation at Heavy Load
nal resistor. Internal compensation and soft-start further n
Low-Ripple Burst Mode® Operation at Light Load
reduce external component count. Boundary mode opera- n
Minimum Load <0.5% (Typ) of Full Output
tion provides a small magnetic solution with excellent load n
VOUT Set with a Single External Resistor
regulation. Low ripple Burst Mode operation maintains n No Transformer Third Winding or Opto-Isolator high efficiency at light load while minimizing the output Required for Regulation voltage ripple. A 260mA, 150V DMOS power switch is n Accurate EN/UVLO Threshold and Hysteresis integrated along with all high voltage circuitry and control n Internal Compensation and Soft-Start logic into a 5-lead ThinSOT™ package. n 5-Lead TSOT-23 Package The LT8300 operates from an input voltages range of 6V n AEC-Q100 Qualified for Automotive Applications 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
APPLICATIONS
component count, and high efficiency application solution n Isolated Telecom, Automotive, Industrial, Medical for isolated power delivery. Power Supplies All registered trademarks and trademarks are the property of their respective owners. Protected n Isolated Auxiliary/Housekeeping Power Supplies by U.S. Patents, including 5438499, 7463497, and 7471522.
TYPICAL APPLICATION 5V Micropower Isolated Flyback Converter Efficiency vs Load Current
100 + V VOUT IN 90 V 4:1 IN = 36V 36V TO 72V 5V 1mA TO 300mA • 80 2.2µF 300µH 19µH V 70 IN 1M • 47µF VIN = 48V V LT8300 60 IN = 72V EN/UVLO SW V – 50 OUT 40 40.2k 210k EFFICIENCY (%) 30 RFB 20 GND 10 8300 TA01a 0 0 50 100 150 200 250 300 LOAD CURRENT (mA) 8300 TA01b Rev. A Document Feedback For more information www.analog.com 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Operation Applications Information Typical Applications Package Description Typical Application Related Parts