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SIC414 датащи(PDF) 9 Page - Vishay Siliconix

номер детали SIC414
подробное описание детали  microBUCK SiC414 6 A, 28 V Integrated Buck Regulator with 5 V LDO
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производитель  VISHAY [Vishay Siliconix]
домашняя страница  http://www.vishay.com
Logo VISHAY - Vishay Siliconix

SIC414 датащи(HTML) 9 Page - Vishay Siliconix

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Vishay Siliconix
SiC414, SiC424
Document Number: 63388
S13-0248-Rev. B, 04-Feb-13
www.vishay.com
9
This document is subject to change without notice.
THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
For technical questions, contact: powerictechsupport@vishay.com
ELECTRICAL CHARACTERISTICS
APPLICATIONS INFORMATION
Device Overview
The SiC414 and SiC424 are a step down synchronous buck
DC/DC
converter
with
integrated
power
FETs
and
programmable LDO. The device is capable of 6 A operation
at very high efficiency in a tiny 4 mm x 4 mm - 28 pin
package. The programmable operating frequency range of
200 kHz to 1 MHz, enables the user to optimize the solution
for minimum board space and optimum efficiency.
The
buck
controller
employs
pseudo-fixed
frequency
adaptive on-time control. This control scheme allows fast
transient response thereby lowering the size of the power
components used in the system.
The
buck
controller
employs
pseudo-fixed
frequency
adaptive on-time control. This control scheme allows fast
transient response thereby lowering the size of the power
components used in the system.
Input Voltage Range
The SiC414 and SiC424 requires two input supplies for
normal operation: VIN and V5V. VIN operates over the wide
range from 3 V to 28 V. V5V requires a 3.3 V or 5 V supply
input that can be an external source or the internal LDO
configured to supply 5 V.
Pseudo-Fixed Frequency Adaptive On-Time Control
The PWM control method used by the SiC414 and SiC424
is
pseudo-fixed frequency, adaptive on-time, as shown in
figure 1. The ripple voltage generated at the output capacitor
ESR is used as a PWM ramp signal. This ripple is used to
trigger the on-time of the controller.
The adaptive on-time is determined by an internal one-shot
timer. When the one-shot is triggered by the output ripple, the
device sends a single on-time pulse to the high side
MOSFET. The pulse period is determined by VOUT and VIN;
the period is proportional to output voltage and inversely
proportional to input voltage. With this adaptive on-time
arrangement, the device automatically anticipates the
on-time needed to regulate VOUT for the present VIN
condition and at the selected frequency.
The adaptive on-time control has significant advantages over
traditional control methods used in the controllers today.
• Reduced component count by eliminating DCR sense or
current sense resistor as no need of a sensing inductor
current.
• Reduced
saves
external
components
used
for
compensation by eliminating the no error amplifier and
other components.
• Ultra fast transient response because of fast loop,
absence of error amplifier speeds up the transient
response.
• Predictable frequency spread because of constant on-time
architecture.
• Fast transient response enables operation with minimum
output
capacitance
Overall,
superior
performance
compared to fixed frequency architectures.
Overall, superior performance compared to fixed frequency
architectures.
Start-up with VIN Ramping up
(VIN = 12 V, VOUT = 1 V, FSW = 500 kHz)
Over-Current Protection
(VIN = 12 V, VOUT = 1 V, FSW = 500 kHz)
Figure 1 - PWM Control Method, VOUT Ripple
VIN
CIN
VLX
Q1
Q2
L
ESR
+
FB
VLX
tON
VFB
COUT
VOUT
FB threshold


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