Datasheet Texas Instruments UC3845AD8TR — Ficha de datos
| Fabricante | Texas Instruments |
| Serie | UC3845A |
| Numero de parte | UC3845AD8TR |
Controlador PWM en modo actual 8-SOIC 0 a 70
Hojas de datos
UCx84xA Current-Mode PWM Controller datasheet
PDF, 2.1 Mb, Revisión: E, Archivo publicado: jul 25, 2016
Extracto del documento
Precios
Estado
| Estado del ciclo de vida | Activo (Recomendado para nuevos diseños) |
| Disponibilidad de muestra del fabricante | No |
Embalaje
| Pin | 8 | 8 | 8 |
| Package Type | D | D | D |
| Industry STD Term | SOIC | SOIC | SOIC |
| JEDEC Code | R-PDSO-G | R-PDSO-G | R-PDSO-G |
| Package QTY | 2500 | 2500 | 2500 |
| Carrier | LARGE T&R | LARGE T&R | LARGE T&R |
| Device Marking | UC3845A | UC3845 | AD8 |
| Width (mm) | 3.91 | 3.91 | 3.91 |
| Length (mm) | 4.9 | 4.9 | 4.9 |
| Thickness (mm) | 1.58 | 1.58 | 1.58 |
| Pitch (mm) | 1.27 | 1.27 | 1.27 |
| Max Height (mm) | 1.75 | 1.75 | 1.75 |
| Mechanical Data | Descargar | Descargar | Descargar |
Paramétricos
| Control Method | Peak Current Mode |
| Duty Cycle(Max) | 50 % |
| Frequency(Max) | 500 kHz |
| Frequency(Min) | 26 kHz |
| Gate Drive(Typ) | 1 A |
| Operating Temperature Range | 0 to 70 C |
| Package Group | SOIC |
| Rating | Catalog |
| Special Features | Error Amplifier,Multi-topology |
| Topology | Boost,Buck,Buck-Boost,Flyback,Forward |
| UVLO Thresholds On/Off | 8.4/7.6 V |
| Vin(Max) | 400 V |
| Vin(Min) | 8.4 V |
Plan ecológico
| RoHS | Obediente |
Notas de aplicación
- DN-30 Programmable Electronic Circuit BreakerPDF, 164 Kb, Archivo publicado: sept 5, 1999
This design note describes a programmable electronic circuit breaker that uses the UC3843A control IC to facilitate a high-speed turnoff following an overcurrent condition. This low-cost industry-standard IC contains the required protection features and drive capability in a single 8-pin device. - DN-29 UC3842A Family - Frequency Foldback Technique Provides ProtectionPDF, 51 Kb, Archivo publicado: sept 5, 1999
Excessive power dissipation can occur in switch-mode power supplies during startup and overload conditions. Many sophisticated PWM controllers provide the means for protection against these problems; however simple low-cost controllers require additional circuitry. This design note describes a circuit that uses only one additional resistor and transistor to enhance the performance of the UC3842A - DN-26 UC3842A Low-Cost Start-up and Fault Protection CircuitPDF, 155 Kb, Archivo publicado: sept 5, 1999
The UC1842/3/4/5 family of control ICs can implement off-line or DC-to-DC fixed-frequency current-mode control schemes with a minimal external parts count. This design note describes a circuit with low startup current (less than 0.5mA) MOSFET-compatible undervoltage lockout thresholds programmable restart-delay HICCUP fault protection auxiliary 5V precision reference and overvoltage/overtemper - DN-27 UC1842/UC1842A Family - Summary of Functional DifferencesPDF, 21 Kb, Archivo publicado: sept 5, 1999
The UC1842A/3A/4A/5A family of control ICs is a pin-for-pin compatible improved version of the UC3842/3/4/5 family. Providing the necessary features to control current-mode switched-mode power supplies this device has been improved for higher frequency off-line power supplies. This new A series of controllers UC1842A/43A/44A/45A is superior to its predecessors in startup current requirements - DN-40 The Effects of Oscillator Discharge Current Variations on Maximum DutyPDF, 39 Kb, Archivo publicado: sept 5, 1999
This design note details programming frequency and maximum duty cycle using the UC3842 and UC3842-A PWM oscillator ICs. Simplified equations are used to develop obtainable ranges for parameters over IC tolerances. - UCC38C42 Family of High-Speed BiCMOS Current-Mode PWM ControllersPDF, 280 Kb, Archivo publicado: feb 7, 2002
Since their introduction in the mid 1980?s the bipolar UC3842 family of Pulse width modulation (PWM)controllers has grown to become the most widely-used control strategy in the power supply industry. [1] The reasons for success are quite clear the devices feature an elegantly simple yet very effective control architecture they use only 8 pins they can drive MOSFET gates directly and they offer - U-111 Practical Considerations in Current Mode Power SuppliesPDF, 787 Kb, Archivo publicado: sept 5, 1999
This application note explains the numerous PWM functions and ways to maximize their usefulness. It covers practical circuit design considerations such as slope compensation gate drive circuitry external control functions synchronization and paralleling current-mode controlled modules. Circuit diagrams and simplified equations are included. - DN-42A Design Considerations for Transitioning from UC3842 to the New UCC3802PDF, 42 Kb, Archivo publicado: sept 5, 1999
The UCC3802 offers numerous advantages that allow the power supply design engineer to meet requirements for lower power for battery-operated equipment higher switching frequencies for reduced magnetics size higher levels of circuit integration for improved reliability and lower cost. The UCC3802 family of devices is pin-out compatible with the UC3842 and UC3842A families; however it is not plu - Conditioning a Switch-mode Power Supply Current Signal Using TI Op AmpsPDF, 61 Kb, Archivo publicado: marzo 23, 2000
The switch-mode power supply primary current is often sensed using a power resistor. Using an op amp to amplify the current-sense signal can reduce cost and improve noise performance and efficiency. This report reviews the advantages of using an op amp circuit and analyzes the design criteria needed to choose the proper op amp. - Understanding Buck-Boost Power Stages in Switchmode Power Supplies (Rev. A)PDF, 363 Kb, Revisión: A, Archivo publicado: mayo 28, 2002
Linea modelo
Serie: UC3845A (10)
Clasificación del fabricante
- Semiconductors > Power Management > Offline and Isolated DC/DC Controllers and Converters > PWM and Resonant Controller