Datasheet LT3002 (Analog Devices)
| 制造商 | Analog Devices |
| 描述 | 36V 10W No-Opto Isolated Flyback Converter |
| 页数 / 页 | 12 / 1 — FEATURES. DESCRIPTION. 4V to 36V Input Voltage Range. 3.6A, 65V Internal … |
| 文件格式/大小 | PDF / 811 Kb |
| 文件语言 | 英语 |
FEATURES. DESCRIPTION. 4V to 36V Input Voltage Range. 3.6A, 65V Internal DMOS Power Switch. Low Quiescent Current
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LT3002 36V 10W No-Opto Isolated Flyback Converter
FEATURES DESCRIPTION
n
4V to 36V Input Voltage Range
The LT®3002 is a monolithic micropower isolated fly- n
3.6A, 65V 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
Quasi-Resonant Boundary Mode Operation at
requires no third winding or opto-isolator for regulation.
Heavy Load
The output voltage is programmed with two external n
Low Ripple Burst Mode® Operation at Light Load
resistors and a third optional temperature compensation n
Minimum Load < 0.5% (Typ) of Full Output
resistor. Boundary mode operation provides a small mag- n No Transformer Third Winding or Opto-Isolator netic solution with excellent load regulation. Low ripple Required for Output Voltage Regulation Burst Mode operation maintains high efficiency at light n Accurate EN/UVLO Threshold and Hysteresis load while minimizing the output voltage ripple. A 3.6A, n Temperature Compensation for Output Diode 65V DMOS power switch is integrated along with all the n Output Short-Circuit Protection high voltage circuitry and control logic into a thermally n Thermally Enhanced 8-Lead SO Package enhanced 8-lead SO package. The LT3002 operates from an input voltage range of 4V
APPLICATIONS
to 36V and delivers up to 10W of isolated output power. The high level of integration and the use of boundary n Isolated Automotive, Industrial, Medical and low ripple burst modes result in a simple to use, low Power Supplies component count, and high efficiency application solution n Isolated Auxiliary/Housekeeping Power Supplies for isolated power delivery. All registered trademarks and trademarks are the property of their respective owners. Protected by U.S. Patents, including 5438499, 7463497, 7471522.
TYPICAL APPLICATION 4V to 32VIN/5VOUT Isolated Flyback Converter Efficiency vs Load Current
90 VIN V + OUT 4V TO 32V 3:1 5V 470pF • 85 9µH 1µH 220µF VIN 39Ω 10µF • 80 EN/UVLO SW V – OUT LT3002 154k 75 GND RFB 10mA TO 1.1A (VIN = 5V) 10mA TO 2.0A (V EFFICIENCY (%) INTV R IN = 12V) 70 CC REF 10mA TO 2.9A (VIN = 24V) 1µF 115k 10k 65 VIN = 5V TC VIN = 12V 3002 TA01a VIN = 24V 60 0 0.5 1.0 1.5 2.0 2.5 3.0 LOAD CURRENT (A) 3002 TA01b Rev. 0 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 Package Description
FEATURES DESCRIPTION
n
4V to 36V Input Voltage Range
The LT®3002 is a monolithic micropower isolated fly- n
3.6A, 65V 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
Quasi-Resonant Boundary Mode Operation at
requires no third winding or opto-isolator for regulation.
Heavy Load
The output voltage is programmed with two external n
Low Ripple Burst Mode® Operation at Light Load
resistors and a third optional temperature compensation n
Minimum Load < 0.5% (Typ) of Full Output
resistor. Boundary mode operation provides a small mag- n No Transformer Third Winding or Opto-Isolator netic solution with excellent load regulation. Low ripple Required for Output Voltage Regulation Burst Mode operation maintains high efficiency at light n Accurate EN/UVLO Threshold and Hysteresis load while minimizing the output voltage ripple. A 3.6A, n Temperature Compensation for Output Diode 65V DMOS power switch is integrated along with all the n Output Short-Circuit Protection high voltage circuitry and control logic into a thermally n Thermally Enhanced 8-Lead SO Package enhanced 8-lead SO package. The LT3002 operates from an input voltage range of 4V
APPLICATIONS
to 36V and delivers up to 10W of isolated output power. The high level of integration and the use of boundary n Isolated Automotive, Industrial, Medical and low ripple burst modes result in a simple to use, low Power Supplies component count, and high efficiency application solution n Isolated Auxiliary/Housekeeping Power Supplies for isolated power delivery. All registered trademarks and trademarks are the property of their respective owners. Protected by U.S. Patents, including 5438499, 7463497, 7471522.
TYPICAL APPLICATION 4V to 32VIN/5VOUT Isolated Flyback Converter Efficiency vs Load Current
90 VIN V + OUT 4V TO 32V 3:1 5V 470pF • 85 9µH 1µH 220µF VIN 39Ω 10µF • 80 EN/UVLO SW V – OUT LT3002 154k 75 GND RFB 10mA TO 1.1A (VIN = 5V) 10mA TO 2.0A (V EFFICIENCY (%) INTV R IN = 12V) 70 CC REF 10mA TO 2.9A (VIN = 24V) 1µF 115k 10k 65 VIN = 5V TC VIN = 12V 3002 TA01a VIN = 24V 60 0 0.5 1.0 1.5 2.0 2.5 3.0 LOAD CURRENT (A) 3002 TA01b Rev. 0 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 Package Description