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SI786DG-T1 Scheda tecnica(PDF) 8 Page - Vishay Siliconix

Il numero della parte SI786DG-T1
Spiegazioni elettronici  Dual-Output Power-Supply Controller
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Produttore elettronici  VISHAY [Vishay Siliconix]
Homepage  http://www.vishay.com
Logo VISHAY - Vishay Siliconix

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Si786
Vishay Siliconix
www.vishay.com
8
Document Number: 70189
S-40807—Rev. J, 26-Apr-04
ORDERING INFORMATION
Part Number
Lead (Pb)-Free
Part Number
Temp Range
VOUT
Si786CG
33 V
Si786CG-T1
Si786CG-T1—E3
3.3 V
Si786CRG
C-Grade
3 45 V
Si786CRG-T1
Si786CRG-T1—E3
C-Grade
0 to 70_C
3.45 V
Si786CSG
36 V
Si786CSG-T1
Si786CSG-T1—E3
3.6 V
Si786LG
33 V
Si786LG-T1
Si786LG-T1—E3
3.3 V
Si786LRG
L-Grade
3 45 V
Si786LRG-T1
Si786LRG-T1—E3
L-Grade
−10_ to 90_C
3.45 V
Si786LSG
36 V
Si786LSG-T1
Si786LSG-T1—E3
3.6 V
Si786DG
33 V
Si786DG-T1
Si786DG-T1—E3
3.3 V
Si786DRG
D-Grade
3 45 V
Si786DRG-T1
Si786DRG-T1—E3
D-Grade
−40_ to 85_C
3.45 V
Si786DSG
36 V
Si786DSG-T1
Si786DSG-T1—E3
3.6 V
Demo Board
Temp Range
Board Type
Si786DB
0 to 70_C
Surface Mount
DESCRIPTION OF OPERATION
The Si786 is a dual step-down converter, which takes a 5.5-V
to 30-V input and supplies power via two PWM controllers (see
Figure 1). These 5-V and 3.3-V supplies run on an optional
300-kHz or 200-kHz internal oscillator, or an external sync
signal. Amount of output current is limited by external
components, but can deliver greater than 6 A on either supply.
As well as these two main Buck controllers, additional loads
can be driven from two micropower linear regulators, one 5 V
(VL) and the other 3.3 V (REF)—see Figure 2. These supplies
are each rated to deliver 5 mA. If the linear regulator circuits fall
out of regulation, both Buck controllers are shut down.
Two voltage comparators with adjustable output voltages are
included in the Si786. They can be used for gate drive in load
switching applications, where n-channel MOSFETs are used.
Logic level voltages can be generated as well, for instance to
serve as mP interfacing (e.g. a Power-good signal).
3.3-V Switching Supply
The 3.3-V supply is regulated by a current-mode PWM
controller in conjunction with several externals: two n-channel
MOSFETs, a rectifier, an inductor and output capacitors (see
Figure 1). The gate drive supplied by DH3 needs to be greater
than VL , so it is provided by the bootstrap circuit consisting of
a 100-nF capacitor and diode connected to BST3 .
A low-side switching MOSFET connected to DL3 increases
efficiency by reducing the voltage across the rectifier diode. A
low value sense resistor in series with the inductor sets the
maximum current limit, to disallow current overloads at
power-on or in short-circuit situations.
The soft-start feature on the Si786 is capacitor programmable;
pin SS3 functions as a constant current source to the external
capacitor connected to GND. Excess currents at power-on are
avoided, and power-supplies can be sequenced with different
turn-on delay times by selecting the correct capacitor value.
5-V Switching Supply
The 5-V supply is regulated by a current-mode PWM controller
which is nearly the same as the 3.3-V output. The dropout
voltage across the 5-V supply, as shown in the schematic in
Figure 1, is 400 mV (typ) at 2 A. If the voltage at V+ falls, nearing
5 V, the 5-V supply will lower as well, until the VL linear regulator
output falls below the 4-V undervoltage lockout threshold.
Below this threshold, the 5-V controller is shut off.
The frequency of both PWM controllers is set at 300 kHz when
the SYNC pin is tied to REF. Connecting SYNC to either GND
or VL sets the frequency at 200 kHz.


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