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LM5185-DESIGN-CALC — LM5185 PSR Flyback Controller Quickstart Design Calculator
LM5185 PSR Flyback Controller Quickstart Design Calculator
LM5185
Controlador de retorno invertido de regulación del lado primario de 100 VIN con baja IQ y baja EMI
Hoja de datos
LM5185
- Functional Safety-Capable
- 4.5-V to 100-V wide input voltage range
- Extended power range from less than 1 W to more than 50 W
- Robust PSR flyback design for reliable and rugged applications
- Robust design with only a transformer crossing the isolation barrier
- ±1.5% total output regulation accuracy
- Optional VOUT temperature compensation
- Input UVLO and thermal shutdown protection
- Hiccup-mode overcurrent fault protection
- 0.9-mm HV-LV pin spacing in 14-pin HTSSOP package
- –40°C to +150°C junction temperature range
- Integration reduces design size and cost
- No optocoupler or transformer auxiliary winding required for V OUT regulation
- 2-A peak sink and 1-A peak source high-current power MOSFET gate driver
- High efficiency with best-in-class active I Q
- Quasi-resonant switching in boundary conduction mode (BCM) at heavy load
- External VCC option for improved efficiency
- High light-load efficiency with lowest I Q (25-µA typical with external VCC)
- Single and multiple output implementations
- Ultra-low conducted and radiated EMI signatures
- Soft switching avoids diode reverse recovery
- Designed for CISPR 32 EMI requirement
- Create a custom design using LM5185 with WEBENCH Power Designer
The LM5185 is a primary-side regulated (PSR) flyback controller with high efficiency over a wide input voltage range of 4.5 V to 100 V. The isolated output voltage is sampled from the primary-side flyback voltage, eliminating the need for an optocoupler, voltage reference, or third winding from the transformer for output voltage regulation.
The high level of integration results in a simple, reliable, and high-density design with only a transformer crossing the isolation barrier. Boundary conduction mode (BCM) switching enables a compact magnetic design and better than ±1.5% load and line regulation performance. BCM supports applications of up to 100-V input with enhanced headroom for line transients.
The LM5185 flyback controller simplifies implementation of isolated DC/DC supplies with optional features to optimize performance for the target end equipment. The output voltage is set by one resistor, while an optional resistor improves output voltage accuracy by negating the thermal coefficient of the flyback diode voltage drop. The LM5185 controller, with the integrated high-current MOSFET gate driver, extends the power range from less than 1 W to more than 50 W, making the device a scalable and easy-to-migrate design over a wide power range. The tunable compensation using the COMP pin and the adjustable peak current limit with the current-sensing resistor make the design flexible and an excellent choice towards different application requirements.
Additional features include an internally-fixed or externally-programmable soft start, optional external VCC for higher efficiency, precision enable input with hysteresis for adjustable line UVLO, peak current-mode control with shunt current sensing, hiccup-mode overload protection, a high-current MOSFET gate driver, and thermal shutdown protection with automatic recovery. A connection to the high-voltage MOSFET drain is not required, thus increasing safety and simplifying PCB clearance distance requirements.
The LM5185 flyback controller is available in a 14-pin, 5-mm × 4.4-mm, thermally-enhanced HTSSOP package with 0.65-mm pin pitch.
Documentación técnica
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Ver todo 4 | Tipo | Título | Fecha | ||
|---|---|---|---|---|
| * | Data sheet | LM5185100-VINPSR Flyback DC/DC Controller With Low IQand Low EMI datasheet | PDF | HTML | 10 nov 2023 |
| Technical article | Mitigating CMTI on a PSR flyback for SiC-based traction inverter designs | PDF | HTML | 05 ene 2024 | |
| Certificate | LM5185EVM-SIO EU Declaration of Conformity (DoC) | 24 jul 2023 | ||
| Functional safety information | LMx5185 Functional Safety FIT Rate, FMD and Pin FMA | PDF | HTML | 24 may 2023 |
Diseño y desarrollo
Para conocer los términos adicionales o los recursos necesarios, haga clic en cualquier título de abajo para ver la página de detalles cuando esté disponible.
Placa de evaluación
LM5185EVM-SIO — Módulo de evaluación de una salida aislada LM5185-Q1
El módulo de evaluación (EVM) LM5185EVM-SIO demuestra las características y el rendimiento del controlador de retorno en el lado primario (PSR) LM5185-Q1. Muestrea la tensión del devanado primario del transformador para lograr una regulación de salida ajustada sin utilizar el optoacoplador ni el (...)
Modelo de simulación
LM5185 and LM5185-Q1 PSpice Transient Model (Rev. A)
SNVMCC7A.ZIP (107 KB) - PSpice Model
| Encapsulado | Pines | Símbolos CAD, huellas y modelos 3D |
|---|---|---|
| HTSSOP (PWP) | 14 | Ultra Librarian |
Pedidos y calidad
Información incluida:
- RoHS
- REACH
- Marcado del dispositivo
- Acabado de plomo/material de la bola
- Clasificación de nivel de sensibilidad a la humedad (MSL) / reflujo máximo
- Estimaciones de tiempo medio entre fallas (MTBF)/fallas en el tiempo (FIT)
- Contenido del material
- Resumen de calificaciones
- Monitoreo continuo de confiabilidad
Información incluida:
- Lugar de fabricación
- Lugar de ensamblaje
Soporte y capacitación
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