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L6725TR Datasheet(PDF) 7 Page - STMicroelectronics

No. de pieza L6725TR
Descripción Electrónicos  Low cost adjustable step-down controller
Download  27 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
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L6725TR Datasheet(HTML) 7 Page - STMicroelectronics

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L6725
Pin connections and functions
7/27
4OCL
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 100
µA (I
OCL) from this pin to ground through the external resistor
(ROCL). The over-current threshold is given by the following equation:
5OCH
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 100
µA current generator (IOCH) sinks a current from the drain through the
external resistor (ROCH). The over-current threshold is given by the following
equation:
6
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.
7
HGATE
This pin is connected to the high-side MOSFET(s) gate.
8BOOT
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).
9PGND
This pin has to be connected closely to the low-side MOSFET(s) source in order to
reduce the noise injection into the device.
10
LGATE
This pin is connected to the low-side MOSFET(s) gate.
11
VCCDR
5V internally regulated voltage. It is used to supply the internal drivers. Filter it to
ground with a 1uF ceramic cap.
12
VCC
Supply voltage pin. The operative supply voltage range is from 4.5V to 14V.
Table 3.
Pin functions
DSonLS
R
2
OCL
R
OCL
I
VALLEY
I
=
DSonHS
R
OCH
R
OCH
I
PEAK
I
=


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