VNF9D5F datasheet(18/106 Pages) STMICROELECTRONICS

部件名	VNF9D5F

功能描述	2-channel high-side driver with STi²Fuse protection for automotive power distribution applications

PDF	106 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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18 / 106 page

Table 12. FIXED_DROP table

FIXED_DROP(m)

IOUT range

0.25*INOM ÷ 0

0.5*INOM ÷ 0.25*INOM

0.75*INOM ÷ 0.5*INOM

INOM ÷ 0.75*INOM

The concept of up and down-counting for RMS current control is illustrated in the figure below:

Figure 10. I²t counter with varying INOM latch and unlatch

Inom

Counter Max

Unlatch by

SPI or DIN

SOCRx,

DINx

I²t latch

IOUT

I²t counter

The last (13th) step of the I²t protection staircase curve is equal to 10 * INOM. Whenever the load current exceeds

the 13th threshold, the output channel is latched off immediately within tdoff + tf, protecting the integrity of the

board net power supply.

The I²t block is supplied from an internal voltage regulator supplied by VREG. Therefore, as soon as VREG drops

below VREG_POR_L, the accumulated I²t counter value is reset and the device enters in sleep mode.

VNF9D5F

Protections

DS13946 - Rev 6

page 18/106

VNF9D5F 数据表(PDF) 18 Page - STMicroelectronics