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LM25185

AKTIV

Flyback-Controller mit primärseitiger Regelung für die Automobilindustrie, 42 VIN, mit niedrigem IQ

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Datenblatt

LM25185

AKTIV
Datenblatt Jetzt bestellen

Produktdetails

Vin (min) (V) 4.5 Vin (max) (V) 42 Operating temperature range (°C) -40 to 125 Control mode Peak current mode Topology PSR flyback Rating Catalog
Vin (min) (V) 4.5 Vin (max) (V) 42 Operating temperature range (°C) -40 to 125 Control mode Peak current mode Topology PSR flyback Rating Catalog
HTSSOP (PWP) 14 32 mm² 5 x 6.4
  • Functional Safety-Capable
  • 4.5-V to 42-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 LM25185 with WEBENCH Power Designer
  • Functional Safety-Capable
  • 4.5-V to 42-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 LM25185 with WEBENCH Power Designer

The LM25185 is a primary-side regulated (PSR) flyback controller with high efficiency over a wide input voltage range of 4.5 V to 42 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 42-V input with enhanced headroom for line transients.

The LM25185 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 LM25185 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 LM25185 flyback controller is available in a 14-pin, 5-mm × 4.4-mm, thermally-enhanced HTSSOP package with 0.65-mm pin pitch.

The LM25185 is a primary-side regulated (PSR) flyback controller with high efficiency over a wide input voltage range of 4.5 V to 42 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 42-V input with enhanced headroom for line transients.

The LM25185 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 LM25185 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 LM25185 flyback controller is available in a 14-pin, 5-mm × 4.4-mm, thermally-enhanced HTSSOP package with 0.65-mm pin pitch.
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Technische Dokumentation

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Typ Titel Datum
* Data sheet LM2518542-VINPSR Flyback DC/DC Controller With Low IQand Low EMI datasheet PDF | HTML 10 Nov 2023
Functional safety information LMx5185 Functional Safety FIT Rate, FMD and Pin FMA PDF | HTML 24 Mai 2023

Design und Entwicklung

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Evaluierungsplatine

LM5185EVM-SIO — LM5185–Q1 Evaluierungsmodul mit einem isolierten Ausgang

Das LM5185EVM-SIO-Evaluierungsmodul (EVM) demonstriert die Funktionen und die Leistung des primärseitig geregelten (PSR) LM5185-Q1-Flyback-Controllers. Er misst die Spannung der Primärwicklung des Transformators, um eine enge Ausgangsregelung ohne Verwendung des Optokopplers oder der tertiären (...)
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Simulationsmodell

LM25185 Encrypted PSpice Transient Model

SNVMCD1.ZIP (163 KB) - PSpice Model
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Berechnungstool

LM25185-DESIGN-CALC — LM25185 PSR flyback controller quick start design calculator

LM25185 PSR flyback controller quick start design calculator
Unterstützte Produkte und Hardware

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Produkte
AC/DC & DC/DC controllers (external FET)
LM25185 — Flyback-Controller mit primärseitiger Regelung für die Automobilindustrie, 42 VIN, mit niedrigem IQ LM25185-Q1 — Flyback-Controller mit primärseitiger Regelung für die Automobilindustrie, 42 VIN, mit niedrigem IQ
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HTSSOP (PWP) 14 Optionen anzeigen
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  • Blei-Finish/Ball-Material
  • MSL-Rating / Spitzenrückfluss
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