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SMB117A датащи(PDF) 18 Page - Summit Microelectronics, Inc.

номер детали SMB117A
подробное описание детали  High-power, Four-channel Programmable DC-DC System Power Managers
PDF  32 Pages
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производитель  SUMMIT [Summit Microelectronics, Inc.]
домашняя страница  http://www.summitmicro.com
Logo SUMMIT - Summit Microelectronics, Inc.

SMB117A датащи(HTML) 18 Page - Summit Microelectronics, Inc.

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SMB113A/B/SMB117/A
Preliminary Information
Summit Microelectronics, Inc
2111 2.6 9/16/2010
18
APPLICATIONS INFORMATION
High Voltage Operation:
While the SMB113A has a max input voltage of 6.0V
the controller can operate to0 much higher voltages by
using the circuit depicted below. By inserting a
capacitor, C1, in series with the HSDRV gate signal
the HSDRV pin is isolated from the 12V supply, and
the AC coupling capacitor acts as a level translator
transferring the 0-5V signal from the HSDRV pin to a
12V to 7V (12V-5V = 7V) signal at the gate of the
PFET. When the gate stops switching the capacitor
becomes an open circuit and the gate will be pulled
high by R1 turning off the output. The schottky diode
and the pull-up resistor are used for DC restoration
and as a pull-up respectively.
Since the converter runs directly from the input supply
(12V in this instance) the efficiency is consistent with
that of a synchronous converter. Typical efficiency
curves are shown below.
7V
LSDRV
HSDRV
AC Coupling capacitor
All power comes directly from 12V supply
DC Restoration
C45
22uF
C51
0.1uF
C1
0.1uF
R1
1K
Schottky
C28
22uF
C33
0.1uF
L1
3.3uH
Q2(P)
Q1(N)
Q6
FDC6420C
Vout
1
NP
+12V
time
5V
time
12V
Figure 7 – High-voltage operation



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