LM5185PWPR
Active100-VIN PRIMARY SIDE REGULATION FLYBACK CONTROLLER WITH LOW IQ AND LOW EMI
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LM5185PWPR
Active100-VIN PRIMARY SIDE REGULATION FLYBACK CONTROLLER WITH LOW IQ AND LOW EMI
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Technical Specifications
Parameters and characteristics for this part
| Specification | LM5185PWPR |
|---|---|
| Clock Sync | True |
| Frequency - Switching [Max] | 350 kHz |
| Frequency - Switching [Min] | 11 kHz |
| Mounting Type | Surface Mount |
| Number of Outputs | 1 |
| Operating Temperature [Max] | 125 °C |
| Operating Temperature [Min] | -40 °C |
| Output Configuration | Positive |
| Output Phases | 1 |
| Output Type | Transistor Driver |
| Package / Case | 14-PowerTSSOP |
| Package / Case [x] | 0.173 in |
| Package / Case [y] | 4.4 mm |
| Supplier Device Package | 14-HTSSOP |
| Synchronous Rectifier | True |
| Topology | Flyback |
| Voltage - Supply (Vcc/Vdd) [Max] | 100 V |
| Voltage - Supply (Vcc/Vdd) [Min] | 4.5 V |
Pricing
Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly
| Distributor | Package | Quantity | $ | |
|---|---|---|---|---|
| Digikey | Tape & Reel (TR) | 3000 | $ 1.61 | |
| 6000 | $ 1.55 | |||
| Texas Instruments | LARGE T&R | 1 | $ 2.42 | |
| 100 | $ 2.12 | |||
| 250 | $ 1.49 | |||
| 1000 | $ 1.20 | |||
Description
General part information
LM5185 Series
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.