參數(shù)資料
型號(hào)： L6725TR
廠商： 意法半導(dǎo)體
英文描述： Low cost adjustable step-down controller
中文描述： 低成本可調(diào)降壓控制器
文件頁(yè)數(shù)： 7/27頁(yè)
文件大?。?/td> 489K
代理商： L6725TR
L6725
Pin connections and functions
7/27
4
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 100
μ
A (I
OCL
) from this pin to ground through the external resistor
(R
OCL
). The over-current threshold is given by the following equation:
5
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 100
μ
A current generator (I
OCH
) sinks a current from the drain through the
external resistor (R
OCH
). 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.
8
BOOT
Through this pin is supplied the high-side driver. Connect a capacitor from this pin to
the PHASE pin and a diode from V
CCDR
to this pin (cathode versus BOOT).
9
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.
10
LGATE
This pin is connected to the low-side MOSFET(s) gate.
11
V
CCDR
5V internally regulated voltage. It is used to supply the internal drivers. Filter it to
ground with a 1uF ceramic cap.
12
V
CC
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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