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SI9121DY-5-T1-E3, SI9121DY-T1-E3, SI9122

Table of contents:
Info of SI9121DY-5-T1-E3
Info of SI9121DY-T1-E3
Info of SI9122

SI9121DY-5-T1-E3, SI9121DY-T1-E3, SI9122 Selling Leads, Datasheet

MFG:VISHAY Package Cooled:SOP8 D/C:07+PBFREE

SI9121DY-5-T1-E3, SI9121DY-T1-E3, SI9122 Picture

SI9121DY-5-T1-E3, SI9121DY-T1-E3, SI9122 Datasheet download

Five Points

Part Number: SI9121DY-5-T1-E3

MFG: VISHAY

Package Cooled: SOP8

D/C: 07+PBFREE

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SI9121DY-5-T1-E3 General Description

Si9121 datasheet

SI9122 General Description

Si9122 is a dedicated half-bridge IC ideally suited to fixed telecom applications where efficiency is required at low output voltages (e.g. <3.3 V). Designed to operate within the fixed telecom voltage range of 33−72 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 the 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 600 kHz.

Si9122 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.

SI9122 Maximum Ratings

V_IN (Continuous) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 V
V_IN(100 ms) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 V
V_CC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.5 V
V_BST(Continuous) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90 V
(100 ms) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115 V
V_LX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 V
V_BST − V_LX. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 V
V_REF, R_OSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.3 V to V_CC+ 0.3 V
Logic Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.3 V to V_CC+ 0.3 V
Analog Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.3 V to V_CC+ 0.3 V
HV Pre-Regulator Input Current (continuous) . . . . . . . . . . . . . . . . . . . . . 5 mA
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −65 to 150
Operating Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
Power Dissipationa
TSSOP-20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 850 mW
MLP65-20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2500 mW
Thermal Impedance (JA)
TSSOP-20b . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75/W
MLP65-20c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38/W
Notes
a. Device mounted on JEDEC compliant 1S2P test board..
b. Derate −14 mW/ above 25.
c. Derate −26 mW/above 25.

SI9122 Features

· 12-V to 72-V Input Voltage Range
· Compatible with ETSI 300 132-2
· Integrated Half Bridge Primary Drivers
    (1-A Drive Capability)
· Secondary Synchronous 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
· Over Temperature Protection

SI9122 Typical Application

· Network Cards
· Power Supply Modules

SI9122 Connection Diagram

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