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SI9124 Datasheet(Fiches technique) 1 Page - Vishay Siliconix

Numéro de pièce SI9124
Description  500-kHz Push-Pull DC-DC Converter With Integrated Secondary Synchronous Rectification Control
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Fabricant  VISHAY [Vishay Siliconix]
Site Internet  http://www.vishay.com
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Si9124
Vishay Siliconix
New Product
Document Number: 72099
S-03638—Rev. B, 20-Mar-03
www.vishay.com
1
500-kHz Push-Pull DC-DC Converter With
Integrated Secondary Synchronous Rectification Control
FEATURES
D 12-V to 72-V Input Voltage Range
D Compatible with ETSI 300 132-2 100 V, 100-ms
Transients
D Integrated Push-Pull 1-A Primary Drivers
D Voltage Mode Control
D Voltage Feedforward Compensation
D High Voltage Pre-Regulator Operates During Start-Up
D Current Sensing On OUTB Primary Device
D Hiccup Current Control During Shorted Load
D Low Input Voltage Detection
D Programmable Soft-Start Function
D Programmable Oscillator Frequency
D Over Temperature Protection
APPLICATIONS
D Network Cards
D Power Supply Modules
DESCRIPTION
Si9124 is a dedicated push-pull controller IC ideally suited to
fixed telecom dc-dc converter applications where high
efficiency is required at low output voltages (e.g. <3.3 V).
Designed to operate within the voltage range of 12-72 V and
withstand 100 V, 100 ms transients, the IC is capable of
controlling and directly driving both primary side MOSFET
switches of a push-pull circuit.
High conversion efficiency is achieved by use of synchronous
rectifying MOSFET transistors in the secondary. Due to the
very low on-resistance of the secondary MOSFETs, a
significant increase in the efficiency can be achieved as
compared with conventional Schottky diodes for today’s low
output voltages. On-chip control of the dead time delays
between the primary and secondary signals keep efficiencies
high and prevents accidental destruction of the power
transformer or wasted energy from self timed approaches.
Such a system can achieve conversion efficiencies well in
excess of 90%.
FUNCTIONAL BLOCK DIAGRAM
Pulse
Transformer
-
Figure 1.
Voltage
Control
Current
Control
Pre-Reg
Primary
Drivers
Secondary
Driver
Error
Amp
Opto
CLOAD
RLOAD
VOUT
RS
Power
Transformer
Si9124
Push-Pull
Synchronous
Controller
VIN
VCC
EP
CS2
Voltage
Information
To
VCC
CVIN1
+
CVCC
CS1
1.215 V
Soft-
Start
PWM
CSS
SS
SEC_SYNC
VINEXT
REXT
OUTA
OUTB
Driver
Logic




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