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SI9122E датащи(PDF) 1 Page - Vishay Siliconix

номер детали SI9122E
подробное описание детали  500-kHz Half-Bridge DC/DC Controller with Integrated Secondary Synchronous Rectification Drivers
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производитель  VISHAY [Vishay Siliconix]
домашняя страница  http://www.vishay.com
Logo VISHAY - Vishay Siliconix

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Vishay Siliconix
Si9122E
Document Number: 73866
S-80112-Rev. D, 21-Jan-08
www.vishay.com
1
500-kHz Half-Bridge DC/DC Controller
with Integrated Secondary Synchronous Rectification Drivers
DESCRIPTION
Si9122E is a half-bridge controller IC ideally suited to fixed
telecom applications where high efficiency is required at low
output voltages (e.g. < 3.3 V). Designed to operate within the
fixed telecom voltage range of 36 V to 75 V, the IC is capable
of controlling and driving both the low and high-side switching
devices of a half bridge circuit and also controlling the
switching devices on the secondary side of the bridge. Due
to the very low on-resistance of the secondary MOSFETs, a
significant increase in conversion efficiency can be achieved
as compared with conventional Schottky diodes. Control of
the secondary devices is by means of a pulse transformer
and a pair of inverters. Such a system has efficiencies well in
excess of 90 % even for low output voltages.
On-chip control of the dead time delays between the primary
and secondary synchronous signals keep efficiencies high
and prevent shorting of the power transformer. An external
resistor sets the oscillator frequency from 200 kHz to
500 kHz.
Si9122E has advanced current monitoring and control
circuitry which allow the user to set the maximum current in
the primary circuit. Such a feature acts as protection against
output shorting and also provides constant current into large
capacitive loads during start-up or when paralleling power
supplies. Current sensing is by means of a sense resistor on
the low-side primary device.
FEATURES
92 % primary/secondary duty cycle
135 °C over temperature protection
Compatible with ETSI 300 132-2
28 V to 75 V input voltage range
Integrated ± 1 A half bridge primary drivers
Secondary synchronous rectifier control signals with
programmable deadtime delay
Voltage mode control
Voltage feedforward compensation
High voltage pre-regulator operates during start-up
Current sensing on low-side primary device
Frequency foldback eliminates constant current tail
Advanced maximum current control during start-up and
shorted load
Low input voltage detection
Programmable soft-start function
APPLICATIONS
Network cards
Power supply modules
Distributed power systems
Intermediate bus converter
Brick converter
FUNCTIONAL BLOCK DIAGRAM AND PIN CONFIGURATION
Figure 1.
BST
DH
LX
DL
CS2
CS1
EP
CL_CONT
VINDET
Si9122E
36 V to 75 V
Synchronous
Rectifiers
VCC
-
+
VREF
Error
Amplifier
Opto Isolator
VOUT
+
-
1 V to 12 V Typ.
SRH
SRL
RoHS
COMPLIANT


Аналогичный номер детали - SI9122E

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