LM5158EVM-BST

EVAL BOARD FOR LM5158

ABSTRACT

The LM5158EVM-BST evaluation module showcases the features and performance of the LM5158 device as a wide input voltage, non-synchronous boost converter with dual random spread spectrum. The standard configuration is designed to provide regulate a 12V output at 1.2A from an input of 3.3V to 9V (load derated by half from < 6V input), and switching at a frequency of 2.1MHz.

Trademarks

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1 Features and Electrical Performance

The LM5158EVM-BST supports the following features and performance capabilities:

• Tightly regulated output voltage of 12V with 1% accurate reference voltage

• High conversion efficiency of > 92% at full load

• Constant cycle-by-cycle peak inductor current limit over input voltage range

• Programmable hiccup mode for output overcurrent protection

• User-adjustable soft-start time using CSS

• Output overvoltage protection

• Multiple BIAS pin and VCC pin connections to test multiple configurations

– BIAS connect to VCC

– BIAS supplied with external power supply

– BIAS supplied by output voltage

• Power-good (PGOOD) indicator with selectable pullup source

• 2.1MHz switching frequency

• External clock synchronization

• Programmable dual random spread spectrum reduces the EMI

1.1 Electrical Parameters

1.2 Configuration Points

Table 1-2 indicates the available test points and configuration jumpers. These points offer flexibility in configuring the evaluation module and include, but are not limited to:

• The BIAS pin is connected to the following:

–External supply (VAUX)

–Input voltage (VIN)

–Regulated output voltage (VOUT)

–VCC pin

• The PGOOD pin is supplied by either VCC or VAUX.

• External clock synchronization

• Shutdown signal by pulling the SD pin low

• Four different modes operation to enable and disable the spread spectrum and hiccup mod

2 Application Schematic

The LM5158EVM-BST is capable of multiple configurations. Figure 2-1 shows the standard configuration of the LM5158EVM-BST where the parameters in Table 1-1 are valid. Section 4.2 describes the correct jumper settings and measurement locations recreate the data presented in Section 5.

3 EVM

Picture Figure 3-1 shows the 3D-rendered picture of the LM5158EVM-BST. The actual board color can differ.