LM5185 Series

100-VIN primary side regulation flyback controller with low IQ and low EMI

Catalog

100-VIN primary side regulation flyback controller with low IQ and low EMI

Part	Synchronous Rectifier	Operating Temperature [Max]	Operating Temperature [Min]	Output Type	Voltage - Supply (Vcc/Vdd) [Max]	Voltage - Supply (Vcc/Vdd) [Min]	Clock Sync	Number of Outputs	Supplier Device Package	Package / Case	Package / Case [y]	Package / Case [x]	Output Configuration	Output Phases	Mounting Type	Frequency - Switching [Min]	Frequency - Switching [Max]	Topology
Texas Instruments LM5185PWPR		125 °C	-40 °C	Transistor Driver	100 V	4.5 V		1	14-HTSSOP	14-PowerTSSOP	4.4 mm	0.173 in	Positive	1	Surface Mount	11 kHz	350 kHz	Flyback

Catalog

100-VIN primary side regulation flyback controller with low IQ and low EMI

Key Features

• Functional Safety-CapableDocumentation available to aid functional safety system design4.5-V to 100-V wide input voltage rangeExtended power range from less than 1 W to more than 50 WRobust PSR flyback design for reliable and rugged applicationsRobust design with only a transformer crossing the isolation barrier±1.5% total output regulation accuracyOptional VOUT temperature compensationInput UVLO and thermal shutdown protectionHiccup-mode overcurrent fault protection0.9-mm HV-LV pin spacing in 14-pin HTSSOP package–40°C to +150°C junction temperature rangeIntegration reduces design size and costNo optocoupler or transformer auxiliary winding required for V OUT regulation2-A peak sink and 1-A peak source high-current power MOSFET gate driverHigh efficiency with best-in-class active I QQuasi-resonant switching in boundary conduction mode (BCM) at heavy loadExternal VCC option for improved efficiencyHigh light-load efficiency with lowest I Q (25-µA typical with external VCC)Single and multiple output implementationsUltra-low conducted and radiated EMI signaturesSoft switching avoids diode reverse recoveryDesigned for CISPR 32 EMI requirementCreate a custom design using LM5185 withWEBENCH Power DesignerFunctional Safety-CapableDocumentation available to aid functional safety system design4.5-V to 100-V wide input voltage rangeExtended power range from less than 1 W to more than 50 WRobust PSR flyback design for reliable and rugged applicationsRobust design with only a transformer crossing the isolation barrier±1.5% total output regulation accuracyOptional VOUT temperature compensationInput UVLO and thermal shutdown protectionHiccup-mode overcurrent fault protection0.9-mm HV-LV pin spacing in 14-pin HTSSOP package–40°C to +150°C junction temperature rangeIntegration reduces design size and costNo optocoupler or transformer auxiliary winding required for V OUT regulation2-A peak sink and 1-A peak source high-current power MOSFET gate driverHigh efficiency with best-in-class active I QQuasi-resonant switching in boundary conduction mode (BCM) at heavy loadExternal VCC option for improved efficiencyHigh light-load efficiency with lowest I Q (25-µA typical with external VCC)Single and multiple output implementationsUltra-low conducted and radiated EMI signaturesSoft switching avoids diode reverse recoveryDesigned for CISPR 32 EMI requirementCreate a custom design using LM5185 withWEBENCH Power Designer

Description

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. 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.