L6728 datasheet(5/32 Pages) STMICROELECTRONICS

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L6728

Pins description and connection diagrams

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Pins description and connection diagrams

2.1

Pin descriptions

Figure 3.

Pins connection (top view)

Table 2.

Pins description

Pin #

Name

Function

1BOOT

HS Driver Supply.

Connect through a capacitor (100nF) to the floating node (LS-Drain) pin

and provide necessary bootstrap diode from VCC.

PHASE

HS Driver return path, current-reading and adaptive-dead-time monitor.

Connect to the LS drain to sense RdsON drop to measure the output

current. This pin is also used by the adaptive-dead-time control circuitry to

monitor when HS MOSFET is OFF.

UGATE

HS Driver Output. Connect directly to HS MOSFET gate.

LGATE / OC

LGATE. LS Driver Output. Connect directly to LS MOSFET gate.

OC. Over Current threshold set. During a short period of time following

VCC rising over UVLO threshold, a 10

µA current is sourced from this pin.

Connect to GND with an ROCSET resistor greater than 5kΩ to program OC

Threshold. The resulting voltage at this pin is sampled and held internally

as the OC set point. Maximum programmable OC threshold is 0.55V. A

voltage greater than 0.6V activates an internal clamp and causes OC

threshold to be set at the maximum value.

5GND

All internal references, logic and drivers are connected to this pin.

Connect to the PCB ground plane.

6VCC

Device and Drivers power supply.

Operative range from 5V to 12V. Filter with at least TBD nF MLCC to GND.

COMP / DIS

COMP. Error Amplifier Output. Connect with an RF - CF // CP to FB to

compensate the device control loop.

DIS. The device can be disabled by pushing this pin lower than 0.75V(typ).

Setting free the pin, the device enables again.

8FB

Error Amplifier Inverting Input.

Connect with a resistor RFB to the output regulated voltage. Output resistor

divider may be used to regulate voltages higher than the reference.

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