ASL4501SHN datasheet(8/43 Pages) NXP

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ASL4501SHN

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Product data sheet

Rev. 2 — 10 January 2018

8 of 43

NXP Semiconductors

ASL4501SHN

Four-phase boost converter

8.1.4 Fail silent mode

The ASL4501SHN switches from operation mode to fail silent mode, when the junction

temperature exceeds the over temperature shutdown threshold or a gate driver 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 remains operational.

8.2 Boost converter configuration

The ASL4501SHN is an automatic boost converter IC delivering constant DC-to-DC

voltage to a load. It has a fixed frequency current mode control for an enhanced stable

operation.

The ASL4501SHN offers four phases. Each phase consists of a coil, a resistor,

a MOSFET and a diode as shown in Figure 4.

To allow flexible use of the ASL4501SHN, the configuration is based on virtual phases.

The virtual phases are then mapped to a real physical phase according to the physical

connections and conditions of the circuitry around the ASL4501SHN as shown in

Figure 5.

Fig 4.

Boost converter phase circuit

aaa-018173

SNHx

FBx

Voutx

SNLx

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