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L6911E Fiches technique(PDF) 6 Page - STMicroelectronics

No de pièce L6911E
Description  5 BIT PROGRAMMABLE STEP DOWN CONTROLLER WITH SYNCHRONOUS RECTIFICATION
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

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L6911E
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VCC =12V
VCC =5V
Switching frequency variations vs. RT are reported in Fig.1.
Note that forcing a 50
µA current into this pin, the device stops switching because no current is delivered to the
oscillator.
Figure 1.
Digital to Analog Converter
The built-in digital to analog converter allows the adjustment of the output voltage from 1.050V to 1.825V with
25mV binary steps as shown in the previous table 1. The internal reference is trimmed to ensure the precision
of 1%.
The internal reference voltage for the regulation is programmed by the voltage identification (VID) pins. These
are TTL compatible inputs of an internal DAC that is realised by means of a series of resistors rpoviding a par-
tition of the internal voltage reference. The VID code drives a multiplexer that selects a voltage on a precise
point of the divider. The DAC output is delivered to an amplifier obtaining the VPROG voltage reference (i.e. the
set-point of the error amplifier). Internal pull-ups are provided (realized with a 5
µA current generator); in this
way, to program a logic ”1” it is enough to leave the pin floating, while to program a logic ”0” it is enough to short
the pin to GND.
The voltage identification (VID) pin configuration also sets the power-good thresholds (PGOOD) and the over-
voltage protection (OVP) thresholds.
Soft Start and Inhibit
At start-up a ramp is generated charging the external capacitor CSS by means of a 10µA constant current, as
shown in figure 2.
When the voltage across the soft start capacitor (VSS) reaches 0.5V the lower power MOS is turned on to dis-
charge the output capacitor. As VSS reaches 1V (i.e. the oscillator triangular wave inferior limit) also the upper
f
S
200kH z
4.306 10
7
R
T k Ω
()
-----------------------------
+
=
f
S
200k H z
15 10
7
R
T k Ω
()
--------------------
+
=
10
10 0
1000
Fr equency [ kH z]
10
100
1000
10000
RT to G N D
RT to V CC= 12 V
RT to V CC= 5V


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