L6717 datasheet(45/56 Pages) STMICROELECTRONICS

部品番号	L6717

部品情報	High-efficiency hybrid AM2r2 controller with I2C interface and embedded drivers

PDF	56 Pages

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メーカー	STMICROELECTRONICS [STMicroelectronics]

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45 / 56 page

L6717

Output voltage monitoring and protections

Doc ID 17326 Rev 1

45/56

8.4.2

NB section

NB section performs per-phase over current: its maximum information current (IINFO_NB) is

internally limited to IOCTH_NB (35 μA typ). If the current information for the NB phase

exceeds the end-of-scale current (i.e. if IINFO_NB > IOCTH_NB), the device will turn-on the

low-side MOSFET, also skipping clock cycles, until the threshold is re-crossed (i.e. until

IINFO_NB < IOCTH_NB).

After exiting the OC condition, the low-side MOSFET is turned off and the high-side is

turned on with a duty cycle driven by the PWM comparator.

Design RG_NB resistor in order to have IDROOP_NB = IOCTH_NB (35μA) at the IOC_NBmax

current.

It results:

Note:

DRP_ADJ command from power manager I2C does not alter the current information used

for per-phase OC.

GNB

OC_NBmax

DCR

⋅

OCTH_NB

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L6717 データシート(PDF) 45 Page - STMicroelectronics