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Overview
| Topology | Boost Converter |
| Input voltage | 8-36 V |
| Output 1 | 33 V / 8 A |
Description
The LM5123EVM-BST evaluation module showcases the features and performance of the LM5123-Q1 wide input voltage synchronous boost controller. The standard configuration is designed to provide a regulated output of 24-V at 200-W, from an input voltage of 8-V to 18-V and switching at 440 kHz. The output voltage can be dynamically up to 33-V using the TRK pin of the LM5123-Q1. This EVM is designed for ease of configuration, enabling an user to evaluate many different applications onthe same module. Functionality includes: low IQ operation, internal feedback resistors, bypass mode operationwhen VIN is greater than VOUT, dynamic output voltage tracking, power good (PGOOD) indicator, programmable frequency dithering, programmable undervoltage lock out (UVLO), and overvoltage protection.
Features
- Input voltage range from 8-V to 18-V
- Internal low leakage current high-impedance feedback resistors with programmable output voltage
- Operating frequency of 440 kHz with externally clock synchronization up or down by 20%
- Output voltage tracking using the TRK pin of the LM5123-Q1
- See Section 2.3.1 for more details on tracking
- Bypass mode operation when VIN is greater than VOUT
- Selectable forced-PWM (FPWM), Skip mode, or diode emulation using the MODE pin
- High power conversion efficiency across a wide operating range
- Full-load efficiency of greater then 97% at VIN = 14-V, VOUT = 24-V, POUT = 200-W
- Cycle-by-cycle peak current limiting
- Optional frequency dithering for improved EMI performance
- Power good indicator
- Programmable soft-start time
- Programmable line undervoltage lockout (UVLO)
Typical applications
- Automotive audio power supply with tracking, Automotive LED bias supply, Automotive HVAC controller supply, Automotive motor power supply
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | C | Tol. C | VR(V (DC)) | Size | Operating Temperature | DF(%) | RISO | Ceramic Type | L(mm) | W(mm) | H(mm) | Fl(mm) | Packaging | L(µH) | IRP,40K(A) | ISAT,10%(A) | ISAT,30%(A) | RDC(mΩ) | fres(MHz) | Material | Pins | Type | Mount | IR(A) | Working Voltage(V (AC)) | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| WCAP-CSGP MLCCs 100 V(DC), 10 nF, ±10% | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 100 V(DC) | Capacitance10 nF | Capacitance±10% | Rated Voltage100 V (DC) | Size0603 | Operating Temperature -55 °C up to +125 °C | Dissipation Factor2.5 % | Insulation Resistance10 GΩ | Ceramic TypeX7R Class II | Length1.6 mm | Width0.8 mm | Height0.8 mm | Pad Dimension0.4 mm | Packaging7" Tape & Reel | – | – | – | – | – | – | – | – | – | – | – | – | |||||
 | WE-HCI SMT Flat Wire High Current Inductor, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | – | – | – | Size1890 | Operating Temperature -40 °C up to +150 °C | – | – | – | Length18.3 mm | Width18.2 mm | Height8.9 mm | – | – | Inductance2.6 µH | Performance Rated Current36.8 A | Saturation Current @ 10%21 A | Saturation Current @ 30%50 A | DC Resistance1.58 mΩ | Self Resonant Frequency42 MHz | MaterialWE-PERM 2 | Pins2 | – | MountSMT | – | – | ||||
 | WR-PHD Pin Header - Single, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-PHD Pin Header - Single | – | – | – | – | Operating Temperature -40 °C up to +105 °C | – | Insulation Resistance1000 MΩ | – | Length5.08 mm | – | – | – | PackagingBag | – | – | – | – | – | – | – | Pins2 | TypeStraight | MountTHT | Rated Current3 A | Working Voltage250 V (AC) | |||
 | WR-PHD Pin Header - Single, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-PHD Pin Header - Single | – | – | – | – | Operating Temperature -40 °C up to +105 °C | – | Insulation Resistance1000 MΩ | – | Length7.62 mm | – | – | – | PackagingBag | – | – | – | – | – | – | – | Pins3 | TypeStraight | MountTHT | Rated Current3 A | Working Voltage250 V (AC) |