L6732C datasheet(8/32 Pages) STMICROELECTRONICS

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3 Pin connections and functions

L6732C

8/32

EAREF

By setting the voltage at this pin is possible to select the internal/external reference

and the switching frequency:

VEAREF 0-80% of VCCDR -> External Reference/FSW=250KHz

VEAREF = 80%-95% of VCCDR -> VREF = 0.6V/FSW=500KHz

VEAREF = 95%-100% of VCCDR -> VREF = 0.6V/FSW=250KHz

An internal clamp limits the maximum VEAREF at 2.5V (typ.). The device captures the

analog value present at this pin at the start-up when VCC meets the UVLO threshold.

OCL

A resistor connected from this pin to ground sets the valley- current-limit. The valley

current is sensed through the low-side MOSFET(s). The internal current generator

sources a current of 100µA (IOCL) from this pin to ground through the external resistor

(ROCL). The over-current threshold is given by the following equation:

Connecting a capacitor from this pin to GND helps in reducing the noise injected from

VCC to the device, but can be a low impedance path for the high-frequency noise

related to the GND. Connect a capacitor only to a "clean" GND.

OCH

A resistor connected from this pin and the high-side MOSFET(s) drain sets the peak-

current-limit. The peak current is sensed through the high-side MOSFET(s). The

internal 100µA current generator (IOCH) sinks a current from the drain through the

external resistor (ROCH). The over-current threshold is given by the following

equation:

PHASE

This pin is connected to the source of the high-side MOSFET(s) and provides the

return path for the high-side driver. This pin monitors the drop across both the upper

and lower MOSFET(s) for the current limit together with OCH and OCL.

HGATE

This pin is connected to the high-side MOSFET(s) gate.

BOOT

Through this pin is supplied the high-side driver. Connect a capacitor from this pin to

the PHASE pin and a diode from VCCDR to this pin (cathode versus BOOT).

PGND

This pin has to be connected closely to the low-side MOSFET(s) source in order to

reduce the noise injection into the device.

LGATE

This pin is connected to the low-side MOSFET(s) gate.

VCCDR

5V internally regulated voltage. It is used to supply the internal drivers. Filter it to

ground with at least 1µF ceramic cap.

VCC

Supply voltage pin. The operative supply voltage range is from 4.5V to 14V.

Table 3.

Pin functions

IVALLEY

IOCL IOCL

•

2RDSONLS

•

---------------------------------

IPEAK

IOCH ROCH

•

RDSONHS

---------------------------------

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