L6919C Просмотр технического описания (PDF) - STMicroelectronics

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L6919C

5 BIT PROGRAMMABLE DUAL-PHASE CONTROLLER WITH DYNAMIC VID MANAGEMENT

STMicroelectronics 

L6919C

PIN FUNCTION (continued)

N

Name

Description

16

ISEN2 Channel 2 current sense pin. The output current may be sensed across a sense resistor or

across the low-side mosfet RdsON. This pin has to be connected to the low-side mosfet drain or to

the sense resistor through a resistor Rg in order to program the over current intervention for this

phase at 140% as follow:

IOCPx = 3---R-5----µs---eA----n--⋅--s-R--e---g--

Where 35µA is the current offset information relative to the Over Current condition (offset at OC

threshold minus offset at zero load).

The net connecting the pin to the sense point must be routed as close as possible to the

PGNDS2 net in order to couple in common mode any picked-up noise.

17

OSC/ Oscillator switching frequency pin. Connecting an external resistor from this pin to GND, the

INH/ external frequency is increased according to the equation:

FAULT

fS = 200kHz + R1----4-O--.--8S---2-C---(-⋅--k-1--Ω-0----6)-

Connecting a resistor from this pin to Vcc (12V), the switching frequency is reduced according to

the equation:

fS = 200kHz + R1----2-O--.--9S---1-C---(-⋅--k-1--Ω-0----7)-

If the pin is not connected, the switching frequency is 200KHz.

Forcing the pin to a voltage lower than 0.6V, the device stop operation and enter the inhibit state.

The pin is forced high when an Over/Under Voltage is detected. This condition is latched; to

recover it is necessary turn off and on VCC.

18-22

VID4-0 Voltage IDentification pins. These input are internally pulled-up and TTL compatible. They are

used to program the output voltage as specified in Table 1 and to set the power good thresholds.

Connect to GND to program a ‘0’ while leave floating to program a ‘1’.

23 PGOOD This pin is an open collector output and is pulled low if the output voltage is not within the above

specified thresholds.

If not used may be left floating.

24

BOOT2 Channel 2 bootstrap capacitor pin. Through this pin is supplied the high side driver and the upper

mosfet. Connect through a capacitor to the PHASE2 pin and through a diode to Vcc (cathode vs.

boot).

25 UGATE2 Channel 2 high side gate driver output.

26 PHASE2 This pin is connected to the source of the upper mosfet and provides the return path for the high

side driver of channel 2.

27 LGATE2 Channel 2 low side gate driver output.

28

PGND Power ground pin. This pin is common to both sections and it must be connected through the

closest path to the low side mosfets source pins in order to reduce the noise injection into the

device.

7/32

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