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L6911E Datasheet(PDF) 11 Page - STMicroelectronics

No. de pieza L6911E
Descripción Electrónicos  5-Bit programmable step down controller with synchronous rectification
PDF  34 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6911E Datasheet(HTML) 11 Page - STMicroelectronics

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L6911E
Device description
11/34
Connecting RT to VCC = 12V or to VCC = 5V the frequency is reduced (current is forced into
the pin), according to the following relationships:
Equation 2
Equation 3
Switching frequency variations vs. RT are reported in Figure 3 on page 11.
Note:
That forcing a 50
µA current into this pin, the device stops switching because no current is
delivered to the oscillator.
Figure 3.
Switching frequency variations vs. RT
f
S
200kHz
4.306 10
7
⋅
R
T kΩ
()
-----------------------------
+
=
VCC = 12V
f
S
200kHz
15 10
7
⋅
R
T kΩ
()
--------------------
+
=
VCC = 5V
10
100
1000
Frequency [kHz]
10
100
1000
10000
RT to GND
RT to VCC=12V
RT to VCC=5V



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