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Giải thích chi tiết về linh kiện  Designing High-Frequency DC-to-DC Converters With the Si9114A Switchmode Controller
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AN701
Vishay Siliconix
Document Number: 70575
16-Jan-01
www.vishay.com
1
Designing High-Frequency DC-to-DC Converters
With the Si9114A Switchmode Controller
INTRODUCTION
Vishay Siliconix’s
Si9100
monolithic
switchmode
PWM
controller established the standard for low-power, high-
efficiency dc-to-dc converters. This versatile device integrates
a number of useful features, including a power MOSFET,
high-voltage start circuitry, and low power consumption. The
Si9114A controller pushes the limits for high-frequency power
conversion by further reducing delay times and adding
additional features. As a result, dc-to-dc converters can be
designed for frequencies up to 1 MHz with simple PWM
topologies instead of the complex resonant ones.
The Si9114A uses constant frequency current mode control.
By increasing the conversion frequency, power supply
designers will be able to:
S reduce the size of energy storage components
S increase reliability by using ceramic capacitors
S produce an all-surface-mount assembly solution
S lower system costs
S simplify the implementation of a distributed power
architecture.
Traditionally, distributed power has been regarded as costly
and impractical to implement due to the high cost of local
power conversion and the perceived complexity of resonant
power supplies. But these decision criteria are now being
changed by the availability of small-outline control ICs,
LITTLE FOOT
r MOSFETs, ceramic capacitors, and new
magnetic components.
Figure 1 Si9114A Block Diagram
R
+
–
–
+
+
–
+
–
+
–
FB
COMP
OSC
2 V
Ref
Gen
R
S
Q
1.25 V
Undervoltage
0.2 V
9.2 V
SS
Error
Amplifier
VCC
+VIN
ROSC
COSC
4.6 V
20
mA
Lockout
VREF
CURRENT SENSE
–VIN
DRIVER
OUTPUT
SHUTDOWN
–VIN
S
Q
NI
VCC
OSC
Out
Enable
SYNC
+–
+
–
4
3
7
14
1
12
11
2
5
6
13
10
8
9
20
mA
Substrate
B 2


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