ASL2507SHNY

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1. Describe

ASL1507SHN; ASL2507SHNY with fixed frequency peak current mode control with parabolic/nonlinear slope compensation. It can operate with input voltages from 5.5 V to 40 V. It can be configured in a boost topology via SPI to provide output voltages up to 80 V to power LED buck driver ICs. The ASL1507SHN is a single-phase boost converter with one output voltage. The ASL2507SHN is a two-phase boost converter that can have two independent outputs. The ASL2507SHN can be configured via the SPI interface as a single output converter with one or two phases or two independent output voltages. If SPI communication is lost under abnormal conditions, it switches to limp mode operation to ensure system security. ASL1507SHN; ASL2507SHN The boost converter can drive up to two external low-side N-channel MOSFETs from an internally regulated adjustable supply. It can drive logic or standard level MOSFETs. The integrated SPI interface also allows programming of power supply under/over voltage range, output voltage range, spread spectrum and DC-DC switching frequency. It optimizes external components and increases flexibility in electromagnetic compatibility (EMC) designs. The interface can also be used to provide diagnostic information such as device temperature, battery voltage, VGG voltage, output voltage, etc. ASL1507SHN; ASL2507SHN integrates non-volatile memory (NVM) to store default configuration internally. Configurations include boost, boost, frequency settings, error detection, and more. The default configuration is for limp home mode (SPI failure) and autonomous mode (no MCU). Additional features include input undervoltage lockout and thermal shutdown at ASL1507SHN junction temperature; ASL2507SHN exceeds Tsd(otp). The device is housed in a very small HVQFN32 package with exposed thermal pad. It is designed to meet the stringent requirements of automotive applications. It is fully AEC-Q100 Grade 1 qualified. It operates in the automotive ambient temperature range of -40 °C to +125 °C temperature range.

2. Feature

    1. AEC-Q100 Grade 1 qualified

    2. Limp mode ensures system security

    3. Up to two flexible output voltages with 3 % accuracy programmable via SPI

    4. Single phase per output or two phase per output

    5. Fixed frequency operation with built-in oscillator from 125 kHz to 700 kHz

    6. Slope compensation to track frequency and output voltage

    7. Programmable control loop compensation

    8. Programmable spread spectrum function

    9. Gate switching stops when output overvoltage is detected

  10. Programmable gate voltage

  11. Low Electromagnetic Emissions (EME) and High Electromagnetic Immunity (EMI)

  12. Output voltage monitoring

  13. Mains voltage measurement

  14. Control signals that enable the device to have a low quiescent current of < 5 μA when EN = 0

  15. Readback of programmed voltage and frequency ranges via SPI

  16. Junction temperature monitoring via SPI

  17. Small package outline HVQFN32

  18. Wide operating input voltage range of +5.5 V to +40 V

  19. Operating ambient temperature range from -40 °C to +125 °C

3. Application

    1. Automotive LED lighting

        - daytime running lights

        - Location or parking lights

        - Low beam lights

        - High beam

        - turn indicators

        - fog lights

        - Cornering lights

4. Pin configuration

5. Configuration mode

The ASL1507SHN; ASL2507SHN switches from reset mode to configuration mode, as soon as the input voltage is above the power- on detection threshold voltage Vth(det)pon and pin EN is HIGH. The configuration registers can be set when the ASL1507SHN; ASL2507SHN is in the configuration mode.

6. Standby mode

The ASL1507SHN; ASL2507SHN switches from operation to standby mode when bit CFG_DN is set to logic 0 while bit AUTO is set to logic 0 as well. In standby mode VO1 and VO2 are turned off while VGG remains on.

7. Operation mode

The ASL1507SHN; ASL2507SHN switches from configuration mode to operation mode, as soon as the configuration done bit is set. Once the bit is set to logic 1, the configuration registers are locked and cannot be changed. In operation mode, the output is available as configured via the SPI interface. Setting the bit VO1EN or VO2EN, starts up VGG. Once VGG is in regulation (signaled by bit VGG_OK), the output voltages VO1 and VO2 are turned on accordingly. When the converters are on, the battery monitoring functionality is available.

8. Fail silent mode

The ASL1507SHN; ASL2507SHN switches from operation, configuration, standby, or limp-home mode to fail silent mode, when the junction temperature exceeds the overtemperature shutdown threshold or a VGG error is detected. It also switches modes when the input voltage is below the undervoltage detection threshold or above the overvoltage detection threshold. In fail silent mode, all outputs are turned off and only the SPI interface remains operational.