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SI9122A Datasheet(Fiches technique) 1 Page - Vishay Siliconix

Numéro de pièce SI9122A
Description  500-kHz Half-Bridge DC/DC Controller With Integrated Secondary Synchronous Rectification Drivers
Télécharger  15 Pages
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Fabricant  VISHAY [Vishay Siliconix]
Site Internet  http://www.vishay.com
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Si9122A
Vishay Siliconix
Document Number: 73492
S–51921—Rev. A, 12-Sep-05
www.vishay.com
1
500-kHz Half-Bridge DC/DC Controller
With Integrated Secondary Synchronous Rectification Drivers
FEATURES
D 28-V to 75-V Input Voltage Range
D Compatible with ETSI 300 132-2
D Integrated "1–A Half Bridge Primary Drivers
D Secondary Synchronous Rectifier Control Signals With
Programmable Deadtime Delay
D Voltage Mode Control
D Voltage Feedforward Compensation
D High Voltage Pre-Regulator Operates During Start-Up
D Current Sensing On Low-Side Primary Device
D Frequency Foldback Eliminates Constant Current Tail
D Advanced Maximum Current Control During Start-Up and
Shorted Load
D Low Input Voltage Detection
D Programmable Soft-Start Function
D Over Temperature Protection
APPLICATIONS
D Network Cards
D Power Supply Modules
DESCRIPTION
Si9122A 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 33–75 V and withstand 100 V,
100 ms transients, 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 accidental
destruction of the power transformer. An external resistor sets
the switching frequency from 200 kHz to 625 kHz.
Si9122A 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.
FUNCTIONAL BLOCK DIAGRAM
Figure 1.
BST
DH
LX
DL
CS2
CS1
EP
CL_CONT
VIN_DET
Si9122A
28 V to 75 V
Synchronous
Rectifiers
VCC
+
VREF
Error
Amplifier
Opto Isolator
VOUT
+
1 V to 12 V Typ.
SRH
SRL




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