Datasheet LT3758, LT3758A (Analog Devices)
| Fabricante | Analog Devices |
| Descripción | High Input Voltage, Boost, Flyback, SEPIC and Inverting Controller |
| Páginas / Página | 38 / 1 — FEATURES. DESCRIPTION. Wide Input Voltage Range: 5.5V to 100V. Positive … |
| Revisión | F |
| Formato / tamaño de archivo | PDF / 1.4 Mb |
| Idioma del documento | Inglés |
FEATURES. DESCRIPTION. Wide Input Voltage Range: 5.5V to 100V. Positive or Negative Output Voltage Programming
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Versión de texto del documento
LT3758/LT3758A High Input Voltage, Boost, Flyback, SEPIC and Inverting Controller
FEATURES DESCRIPTION
n
Wide Input Voltage Range: 5.5V to 100V
The LT®3758/LT3758A are wide input range, current n
Positive or Negative Output Voltage Programming
mode, DC/DC controllers which are capable of generating
with a Single Feedback Pin
either positive or negative output voltages. They can be n Current Mode Control Provides Excellent Transient configured as either a boost, flyback, SEPIC or inverting Response converter. The LT3758/LT3758A drive a low side external n Programmable Operating Frequency (100kHz to N-channel power MOSFET from an internal regulated 7.2V 1MHz) with One External Resistor supply. The fixed frequency, current-mode architecture n Synchronizable to an External Clock results in stable operation over a wide range of supply n Low Shutdown Current < 1µA and output voltages. n Internal 7.2V Low Dropout Voltage Regulator The operating frequency of LT3758/LT3758A can be set n Programmable Input Undervoltage Lockout with Hysteresis with an external resistor over a 100kHz to 1MHz range, and can be synchronized to an external clock using the n Programmable Soft-Start SYNC pin. A minimum operating supply voltage of 5.5V, n Small 10-Lead DFN (3mm × 3mm) and MSOPE Packages and a low shutdown quiescent current of less than 1µA, make the LT3758/LT3758A ideally suited for battery-
APPLICATIONS
powered systems. The LT3758/LT3758A feature soft-start and frequency n Automotive foldback functions to limit inductor current during start- n Telecom up and output short-circuit. The LT3758A has improved n Industrial load transient performance compared to the LT3758. All registered trademarks and trademarks are the property of their respective owners.
TYPICAL APPLICATION 12V Output Nonisolated Flyback Power Supply
D1 VIN VOUT 36V TO 12V 72V C 0.022µF IN 6.2k 1.2A 2.2µF 100V 1M T1 4,5,6 100V V 1,2,3 (PARALLEL) X7R IN (SERIES) DSN SHDN/UVLO 44.2k LT3758 SW 105k SYNC GATE M1 1% SENSE RT CROSS REFFERENCES SS FBX 63.4k VC GND INTV 200kHz CC 1N4148 5.1Ω 0.47µF 10k CVCC C 100pF 4.7µF 0.030Ω 15.8k OUT 1% 47µF 10nF 10V X5R X5R 3758 TA01 Rev F Document Feedback For more information www.analog.com 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Applications Information Typical Applications Package Description Revision History Typical Applications Related Parts Typical Applications Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
FEATURES DESCRIPTION
n
Wide Input Voltage Range: 5.5V to 100V
The LT®3758/LT3758A are wide input range, current n
Positive or Negative Output Voltage Programming
mode, DC/DC controllers which are capable of generating
with a Single Feedback Pin
either positive or negative output voltages. They can be n Current Mode Control Provides Excellent Transient configured as either a boost, flyback, SEPIC or inverting Response converter. The LT3758/LT3758A drive a low side external n Programmable Operating Frequency (100kHz to N-channel power MOSFET from an internal regulated 7.2V 1MHz) with One External Resistor supply. The fixed frequency, current-mode architecture n Synchronizable to an External Clock results in stable operation over a wide range of supply n Low Shutdown Current < 1µA and output voltages. n Internal 7.2V Low Dropout Voltage Regulator The operating frequency of LT3758/LT3758A can be set n Programmable Input Undervoltage Lockout with Hysteresis with an external resistor over a 100kHz to 1MHz range, and can be synchronized to an external clock using the n Programmable Soft-Start SYNC pin. A minimum operating supply voltage of 5.5V, n Small 10-Lead DFN (3mm × 3mm) and MSOPE Packages and a low shutdown quiescent current of less than 1µA, make the LT3758/LT3758A ideally suited for battery-
APPLICATIONS
powered systems. The LT3758/LT3758A feature soft-start and frequency n Automotive foldback functions to limit inductor current during start- n Telecom up and output short-circuit. The LT3758A has improved n Industrial load transient performance compared to the LT3758. All registered trademarks and trademarks are the property of their respective owners.
TYPICAL APPLICATION 12V Output Nonisolated Flyback Power Supply
D1 VIN VOUT 36V TO 12V 72V C 0.022µF IN 6.2k 1.2A 2.2µF 100V 1M T1 4,5,6 100V V 1,2,3 (PARALLEL) X7R IN (SERIES) DSN SHDN/UVLO 44.2k LT3758 SW 105k SYNC GATE M1 1% SENSE RT CROSS REFFERENCES SS FBX 63.4k VC GND INTV 200kHz CC 1N4148 5.1Ω 0.47µF 10k CVCC C 100pF 4.7µF 0.030Ω 15.8k OUT 1% 47µF 10nF 10V X5R X5R 3758 TA01 Rev F Document Feedback For more information www.analog.com 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Applications Information Typical Applications Package Description Revision History Typical Applications Related Parts Typical Applications Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Applications Information Typical Applications Package Description Revision History Typical Application Related Parts