SLUSF27 Data sheet

SLUSF27 November 2023 TPS546B24S

PRODUCTION DATA

Package Options

Mechanical Data (Package|Pins)

RVF|40
- MPQF268C

Thermal pad, mechanical data (Package|Pins)

RVF|40
- QFND333E

Orderable Information

6.6.49 (61h) TON_RISE

CMD Address	61h
Write Transaction:	Write Word
Read Transaction:	Read Word
Format:	SLINEAR11 per CAPABILITY
Phased:	No
NVM Back-up:	EEPROM or Pin Detection
Updates:	On-the-fly

The TON_RISE command sets the time, in milliseconds, from when the output starts to rise until the voltage has entered the regulation band. This effectively sets the slew rate of the reference DAC during the soft-start period. Note that the rise time is equal to TON_RISE regardless of the value of the target output voltage or VOUT_SCALE_LOOP.

Due to hardware limitations in the resolution of the reference DAC slew-rate control, longer TON_RISE times with higher VOUT_COMMAND voltages can result in some quantization error in the programmed TON_RISE times with several TON_RISE times producing the same VOUT slope and TON_RISE time even with different TON_RISE settings or different TON_RISE times for the same TON_RISE setting and different VOUT_COMMAND voltages.

Figure 6-55 (61h) TON_RISE Register Map

15	14	13	12	11	10	9	8
RW	RW	RW	RW	RW	RW	RW	RW
TONR_EXP					TONR_MAN

7	6	5	4	3	2	1	0
RW	RW	RW	RW	RW	RW	RW	RW
TONR_MAN

LEGEND: R/W = Read/Write; R = Read only

Table 6-66 Register Field Descriptions

Bit	Field	Access	Reset	Description
15:11	TONR_ EXP	RW	11110b	Linear format two’s complement exponent
10:0	TONR_ MAN	RW	NVM	Linear format two’s complement mantissa

Attempts to write (61h) TON_RISE beyond the supported range will be considered invalid/unsupported data and cause the TPS546B24S to respond by flagging the appropriate status bits and notifying the host according to the PMBus 1.3.1 Part II specification section 10.9.3. TON_RISE will support the range from 0ms to 31.75 ms in 0.25-ms steps. Values less than 0.5 ms are supported as 0.5 ms.