LT3074AVPBF datasheet(48/62 Pages) AD

48 / 62 page

Data Sheet

LT3074

analog.com

Rev 0.

48 of 62

can be up to a 10ms delay from the time the output voltage hits the limit to the time the fault is reported.

Transitionary faults that last for a time period smaller than the ADC conversion time are filtered out and not reported.

In response to the VOUT_UV_WARN_LIMIT being exceeded, the device:



Sets the NONE_OF_THE_ABOVE bit in STATUS_BYTE register.



Sets the VOUT bit in the STATUS_WORD register.



Sets the VOUT_UV_WARNING bit in the STATUS_VOUT register.



Notifies the host by asserting the ALERT pin.

This command has two data bytes and is formatted in the Linear_16u format.

IOUT_OC_FAULT_LIMIT

The IOUT_OC_FAULT_LIMIT command sets the output current limit in amperes. The current limit programming

range is from 1A to 6.4A with a step size of 50mA. Programmed current limit is rounded to the nearest 50mA step. For

example, 1.01A is rounded to 1A and 1.04A is rounded to 1.05A. If a current limit value less than 1A is programmed,

the data is accepted and stored in the IOUT_OC_FAULT_LIMIT register as received and internally the current limit

value is set at 1A. For output current limit values set above 4.5A, the current limit is governed by the backup current

limit of the LT3074 device.

In the event the output current hits the threshold set by the IOUT_OC_FAULT_LIMIT, the device:



Regulates the output current set by the IOUT_OC_FAULT_LIMIT.



Sets the IOUT_OC_FAULT bit in the STATUS_BYTE register.



Sets the IOUT bit in the STATUS_WORD register.



Sets the IOUT_OC_FAULT bit in the STATUS_IOUT register.



Notifies the host by asserting the ALERT pin.

This command has two data bytes and is formatted in the Linear_5s_11s format.

IOUT_OC_FAULT_RESPONSE

The IOUT_OC_FAULT_RESPONSE notifies the host of the action of the LT3074 when an overcurrent fault is detected.

Table 14. IOUT_OC_FAULT_RESPONSE Command Bit Field Descriptions

Bit

Access Mode

Description

7:6

Read Only

Response

Value

Output Status

‘b00

The LT3074 continues to operate indefinitely while maintaining the

output current at a value set by the IOUT_OC_FAULT_LIMIT without

regard for the output voltage (known as constant current or

brickwall limiting).

5:3

Read Only

Not supported since LT3074 never shuts down (bits are hardwired to ‘b000).

2:0

Read Only

Not supported since LT3074 never shuts down (bits are hard-wired to ‘b000).

In addition to the response mentioned above, the device:



Sets the IOUT_OC_FAULT bit in the STATUS_BYTE register.

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