Datasheet LT8302, LT8302-3 (Analog Devices)
| Fabricante | Analog Devices |
| Descripción | 42VIN Micropower No-Opto Isolated Flyback Converter with 65V/3.6A Switch |
| Páginas / Página | 26 / 1 — FEATURES. DESCRIPTION. 3V to 42V Input Voltage Range. 3.6A, 65V Internal … |
| Revisión | G |
| Formato / tamaño de archivo | PDF / 1.6 Mb |
| Idioma del documento | Inglés |
FEATURES. DESCRIPTION. 3V to 42V Input Voltage Range. 3.6A, 65V Internal DMOS Power Switch. Low Quiescent Current:
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Versión de texto del documento
LT8302/LT8302-3 42VIN Micropower No-Opto Isolated Flyback Converter with 65V/3.6A Switch
FEATURES DESCRIPTION
n
3V to 42V Input Voltage Range
The LT®8302/LT8302-3 is a monolithic micropower iso- n
3.6A, 65V Internal DMOS Power Switch
lated flyback converter. By sampling the isolated output n
Low Quiescent Current:
voltage directly from the primary-side flyback waveform, n
106µA in Sleep Mode
the part requires no third winding or opto-isolator for n
380µA in Active Mode
regulation. The output voltage is programmed with two n
Quasi-Resonant Boundary Mode Operation at
external resistors and a third optional temperature com-
Heavy Load
pensation resistor. Boundary mode operation provides a n
Low Ripple Burst Mode® Operation at Light Load
small magnetic solution with excellent load regulation. n
Minimum Load < 0.5% (Typ) of Full Output
Low ripple Burst Mode operation maintains high efficiency n No Transformer Third Winding or Opto-Isolator at light load while minimizing the output voltage ripple. A Required for Output Voltage Regulation 3.6A, 65V DMOS power switch is integrated along with all n Accurate EN/UVLO Threshold and Hysteresis the high voltage circuitry and control logic into a thermally n Internal Compensation and Soft-Start enhanced 8-lead SO package. n Temperature Compensation for Output Diode The LT8302/LT8302-3 operates from an input voltage n Output Short-Circuit Protection range of 3V to 42V and delivers up to 18W of isolated n Thermally Enhanced 8-Lead SO Package output power. The high level of integration and the use of n AEC-Q100 Qualified for Automotive Applications boundary and low ripple burst modes result in a simple to use, low component count, and high efficiency application
APPLICATIONS
solution for isolated power delivery. n Isolated Automotive, Industrial, Medical All registered trademarks and trademarks are the property of their respective owners. Protected Power Supplies by U.S. patents, including 5438499, 7463497, 7471522. n Isolated Auxiliary/Housekeeping Power Supplies
TYPICAL APPLICATION 3V to 32VIN/5VOUT Isolated Flyback Converter Efficiency vs Load Current
90 VIN V + OUT 3V TO 32V 3:1 5V 470pF • 85 9µH 1µH 220µF VIN 39Ω 10µF • 80 EN/UVLO SW V – OUT LT8302/LT8302-3 154k 75 GND RFB 10mA TO 1.1A (VIN = 5V) 10mA TO 2.0A (V INTV R IN = 12V) EFFICIENCY (%) CC REF 10mA TO 2.9A (V 70 IN = 24V) 1µF 115k 10k VIN = 5V TC 65 8302 TA01a VIN = 12V VIN = 24V 60 0 0.5 1.0 1.5 2.0 2.5 3.0 LOAD CURRENT (A) 8302 TA01b Rev. G 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 Block Diagram Operation Applications Information Package Description Revision History Typical Application Related Parts
FEATURES DESCRIPTION
n
3V to 42V Input Voltage Range
The LT®8302/LT8302-3 is a monolithic micropower iso- n
3.6A, 65V Internal DMOS Power Switch
lated flyback converter. By sampling the isolated output n
Low Quiescent Current:
voltage directly from the primary-side flyback waveform, n
106µA in Sleep Mode
the part requires no third winding or opto-isolator for n
380µA in Active Mode
regulation. The output voltage is programmed with two n
Quasi-Resonant Boundary Mode Operation at
external resistors and a third optional temperature com-
Heavy Load
pensation resistor. Boundary mode operation provides a n
Low Ripple Burst Mode® Operation at Light Load
small magnetic solution with excellent load regulation. n
Minimum Load < 0.5% (Typ) of Full Output
Low ripple Burst Mode operation maintains high efficiency n No Transformer Third Winding or Opto-Isolator at light load while minimizing the output voltage ripple. A Required for Output Voltage Regulation 3.6A, 65V DMOS power switch is integrated along with all n Accurate EN/UVLO Threshold and Hysteresis the high voltage circuitry and control logic into a thermally n Internal Compensation and Soft-Start enhanced 8-lead SO package. n Temperature Compensation for Output Diode The LT8302/LT8302-3 operates from an input voltage n Output Short-Circuit Protection range of 3V to 42V and delivers up to 18W of isolated n Thermally Enhanced 8-Lead SO Package output power. The high level of integration and the use of n AEC-Q100 Qualified for Automotive Applications boundary and low ripple burst modes result in a simple to use, low component count, and high efficiency application
APPLICATIONS
solution for isolated power delivery. n Isolated Automotive, Industrial, Medical All registered trademarks and trademarks are the property of their respective owners. Protected Power Supplies by U.S. patents, including 5438499, 7463497, 7471522. n Isolated Auxiliary/Housekeeping Power Supplies
TYPICAL APPLICATION 3V to 32VIN/5VOUT Isolated Flyback Converter Efficiency vs Load Current
90 VIN V + OUT 3V TO 32V 3:1 5V 470pF • 85 9µH 1µH 220µF VIN 39Ω 10µF • 80 EN/UVLO SW V – OUT LT8302/LT8302-3 154k 75 GND RFB 10mA TO 1.1A (VIN = 5V) 10mA TO 2.0A (V INTV R IN = 12V) EFFICIENCY (%) CC REF 10mA TO 2.9A (V 70 IN = 24V) 1µF 115k 10k VIN = 5V TC 65 8302 TA01a VIN = 12V VIN = 24V 60 0 0.5 1.0 1.5 2.0 2.5 3.0 LOAD CURRENT (A) 8302 TA01b Rev. G 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 Block Diagram Operation Applications Information Package Description Revision History Typical Application Related Parts